Branches of Science
Recent Homework Questions About Science
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chem/science
Please predict what will happen. Im not very good in chem. Iron metal and pb(NO3) Lead metal and Mg(9NO3)2 Copper metal and AL(NO3)3 Lead metal and AgNO3
Thursday, April 18, 2013 at 8:44pm
science
what is the purpose of meiosis
Thursday, April 18, 2013 at 7:42pm
science
what is the differnts between asexual and sexual reproduction
Thursday, April 18, 2013 at 7:38pm
Science
I am doing a project on blizzards and I am having a hard time trying to find 3 good interactive websites. Help please? Thanks!
Thursday, April 18, 2013 at 7:05pm
SCIENCE///////////
a region has a geothermal gradient of 180 ˚C km^-1.what type of metamorphism will occur at a pressure of 1.2×10^8 pa? answer the question by completing the sentence below. In these condition there would be ........??? metamorphism. I would appreciate if someone ...
Thursday, April 18, 2013 at 4:10pm
science
What is the equatorial circumference of Saturn the planet example: (C=3.14 x radius x radius)
Thursday, April 18, 2013 at 2:38pm
Science(Chemistry)
Suppose that 23 mL of 0.6 M K2CrO4(aq) reacts with 13.7 mL of AgNO3(aq) completely. What mass of NaCl is needed to react completely with 38.5 mL of the same AgNO3 solution? Answer in units of g
Thursday, April 18, 2013 at 2:33pm
science
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10È³Ê joule seconds, the speed of light is 2.998 × 10§ m/s)
Thursday, April 18, 2013 at 1:58pm
science
how to prepare 24 μL of 5% H3BO3
Thursday, April 18, 2013 at 12:30am
science
What are the similarities between air masses and fronts?
Wednesday, April 17, 2013 at 10:11pm
Physical Science
When will an object float on a fluid's surface?
Wednesday, April 17, 2013 at 8:08pm
Physical Science
Why does pressure change with elevation and depth?
Wednesday, April 17, 2013 at 8:05pm
science
Pt | Cr3+ (2.7010-4 M), Cr2+ (0.500 M) || Pb2+ (0.0710 M) | Pb Consider the following electochemical cell. Calculate the voltage of the cell, Ecell, including the sign.
Wednesday, April 17, 2013 at 5:27pm
Physical Science
Why does pressure change with elevation and depth?
Wednesday, April 17, 2013 at 3:33pm
science
calculate how many grams of chloride ions are present in 50 grams of ocean salts
Wednesday, April 17, 2013 at 3:24pm
science
Although the salinity of ocean water varies from place to place, the relative amounts of the different salts do not vary significantly. Briefly explain why this is so?
Wednesday, April 17, 2013 at 3:16pm
Science
how to find the speed of a bullet just before it touches the ground when fired horizontally at a velocity 10 m/s from a watch tower 11.5 m high?
Wednesday, April 17, 2013 at 12:56pm
Science +2
Concentrated sulphuric acid has a density of 1.9 g/ml and is 99% H2SO4 by weight. calculate the molarity of H2SO4 in this acid.
Wednesday, April 17, 2013 at 12:42pm
science
light trsavels at 3*10 m/s. an astrounaut shines a flash light in space. 4 hours later a martian sees a light from the astrounaut. how far away is mars from the astrounaut?
Wednesday, April 17, 2013 at 10:42am
Physics(science)
A ball's projected at an angle X to the horizontal from a cliff 96 metres high and strikes the ground at a distance of 260 metres away from the cliff.The time of its flight is 7 seconds.If it's assumed that air resistance's negligible,calculate: 1.the initial ...
Wednesday, April 17, 2013 at 4:58am
7TH GRADE SCIENCE?!?!
1. Which of the following shows the correct sequence of energy transformations when listening to the radio? electrical; kinetic; sound; kinetic; electrical electrical; sound; kinetic; sound; electrical sound; electrical; kinetic; electrical; sound kinetic; sound; electrical; ...
Tuesday, April 16, 2013 at 11:41pm
Someone please help me with science?
1. Which of the following shows the correct sequence of energy transformations when listening to the radio? electrical; kinetic; sound; kinetic; electrical electrical; sound; kinetic; sound; electrical sound; electrical; kinetic; electrical; sound kinetic; sound; electrical; ...
Tuesday, April 16, 2013 at 10:52pm
science
If 1.38 g of steam at 100.0°C condenses into 38.6 g of water, initially at 27.6°C, in an insulated container, what is the final temperature of the entire water sample? Assume no loss of heat into the surroundings. °C
Tuesday, April 16, 2013 at 10:34pm
science
list 1 advantage and disadvantage of having a landfill.
Tuesday, April 16, 2013 at 8:43pm
science
list 1 way you can dispose of trash. What is its advantage and disadvantage?
Tuesday, April 16, 2013 at 8:38pm
science
an object with a volume of one cu ft , weighing 150 lbs. is embedded in the sediment at a depth of 99 fy. in the ocean harbor. the object is best lifted to the surface by
Tuesday, April 16, 2013 at 8:36pm
Science
In 0.5 seconds, a projectile goes from 0 to 300m/s. what is the acceleration of the projectile?
Tuesday, April 16, 2013 at 6:58pm
Math
38.In science lab 20 out of 25 students wore protective glasses. The other 5 students filled out lab reports. Which decimal number is equivalent to the fraction of students who did Not wear protective glasses? A.0.25 B.0.80 C.0.50 D.0.20 A 39.Nik is coloring holiday ornaments ...
Tuesday, April 16, 2013 at 6:54pm
psychology
What makes psychology a science????? and What are independent and dependent variables in regards to scientific research in psychology?????
Tuesday, April 16, 2013 at 6:05pm
math,science
In the Lotka-Volterra competition equations, if a21 > 1, then:
Tuesday, April 16, 2013 at 1:08pm
Science
1. Density is the relationship between ____. (1 point) mass and volume cubic centimeters and pounds weight and volume grams and mass 2. Which of the following is NOT a possible sign of a chemical change? (1 point) a change in state a change in color the release of a gas the ...
Tuesday, April 16, 2013 at 12:50pm
Science(Chemistry)
The effect of intemolecular forces on evaporation chemicals:water,nail polish remover,methylated spirits nd vinegar
Tuesday, April 16, 2013 at 12:29pm
Math
Ms.York has 32 boys and 18 girls in her science class. She ramdomly selects 1 student to help her sweep the floor. What is the probability that the student she selects will be a girl?
Tuesday, April 16, 2013 at 11:33am
Science
Hello. Can someone please show me a link or something to the Big Bang theory???
Tuesday, April 16, 2013 at 11:01am
Life science,Maths and Geography
I am in my last year of high school and not sure of which career path to follow.Please help me with all possible careers to choose from.
Tuesday, April 16, 2013 at 10:40am
science
calculate the time taken by a train to travel 1000m if its initial speed is 30m/s and it has an acceralation of 0.1m/s
Tuesday, April 16, 2013 at 6:08am
URGENT PLZ IT WILL ONLY TAKE A-SEC. SCIENCE!!!!!!!
1. Drought, fewer plants, and fewer nesting sites are examples of __________. (1 point) limiting factors biotic factors abiotic factors population density 2. As you move from level to level in an energy pyramid, energy ____. (1 point) decreases increases stays at the same ...
Tuesday, April 16, 2013 at 2:05am
Science - reproduction
Hey. Well ummm I have a very awkward question. You see, Me and my best friend were just thinking about what it would be like to be a snake. Then we talked about it. And talked and talked. And eventually we started talking about snake doing... Umm... You know what... And we ...
Monday, April 15, 2013 at 9:22pm
Science
Why are some Protista able to move faster than others
Monday, April 15, 2013 at 8:25pm
science
Electrical current generally increases as voltage increases. true false I think it is False..?
Monday, April 15, 2013 at 7:56pm
Science
Some herbicides, such as 2, 4-D are believed to make plant cells divide more rapidly than normal. Why would this kill plants? Why might this be dangerous to humans if it had the same effect on human cells?
Monday, April 15, 2013 at 7:21pm
science
______________ can prevent some bacterial cells? 7th grade science please help meeeee ms sue help me please thanks
Monday, April 15, 2013 at 6:21pm
science
Suppose we initially had n qubits in the state |ψ⟩=∑x∈{0,1}n 45;x|x⟩, on which we were going to perform Fourier sampling (i.e. perform Hadamard transform H⊗n and sample). Unfortunately, a clumsy lab assistant mistakenly applied X ...
Monday, April 15, 2013 at 5:41pm
Science
Electrical current generally increases as voltage increases. true false I think this is true?
Monday, April 15, 2013 at 5:31pm
science
______________ can prevent some bacterial cells? 7th grade science please help me.
Monday, April 15, 2013 at 5:20pm
science
Calculated how many grams of methane (CH4) are in a sealed 80 mL flask at room temperature (22ºC) and 780 mm Hg of pressure. Show all your work.
Monday, April 15, 2013 at 4:03pm
Science
Describe how burning fossil fuels has created an imbalance in the carbon cycle.
Monday, April 15, 2013 at 1:56am
Science
1.You notice green scum floating on the surface of a pond. How can you tell whether these organisms are plants? 2.Explain, using an example how water may become polluted 3.Why is conservation important today? 4.Most people drive cars and heat their homes with petroleum, coal...
Monday, April 15, 2013 at 1:10am
science
Why is it difficult to distinguish between some pure substances and solutions? What methods can overcome this to define if either it is a pure substance or solution?
Sunday, April 14, 2013 at 10:56pm
Science
Explain why would a bottle that is left overnight with water is crack but a empty bottle would not.
Sunday, April 14, 2013 at 9:20pm
science
how does thee sun affect large scale convection in the atmosphere?
Sunday, April 14, 2013 at 7:11pm
Science need help ?????///
An astronomer observes two galaxies, A and B, which have redshifts of: Galaxy A = 0.020 and Galaxy B = 0.010. Which galaxy is closest to us and what is its distance away from us? You may assume that the Hubble constant is H0 = 75 km s–1 Mpc−1 and that the speed of ...
Sunday, April 14, 2013 at 4:59pm
science
you run 100m in 25's. if you later run the same distance in less time , does your average speed increase or decrease? explain.
Sunday, April 14, 2013 at 3:22pm
sciology college course
A science teacher tells her class that their final project requires the student to measure a specific variable and determine the velocity of a car with no more 2.5% error. Jennifer and johnny work hard and decide the velocity of the car is 34.87 m/s. The teacher in forms them ...
Sunday, April 14, 2013 at 2:50pm
science
how does convection in the atmosphere create surface ocean currents?
Sunday, April 14, 2013 at 12:53pm
science help plzzzzzzzzzzzzzzz?
What is the mean photon energy of.......? During the history of the Universe from the Big Bang to the present day, at some point in time the mean temperature of the Universe was 1 × 10^17 K. What was the mean photon energy at this instant, and which of the four ...
Sunday, April 14, 2013 at 11:39am
Science
If rocket had been 10 m above the ground when its horizontal distance from the launchpad was 2m ,wheredo you think rocket would have landed?
Sunday, April 14, 2013 at 8:34am
science
Miguel held a magnet 2cm above some steel safety pins.his magnet picked up eight pins. what will happen if Miguel holds magnet 4cm above the pins?why?
Saturday, April 13, 2013 at 7:24pm
computer science
I need help one how create a spreadsheet that will give an accurate launch profile for a vertical liftoff for the SpaceX Falcon 9 rocket. the information they give me is: •Start with a rocket with a mass, M1, moving with a speed, v1 •The rocket expels some small mass...
Saturday, April 13, 2013 at 6:37pm
Science
Make a solutions by dissolving 4 lbs of sulfur dioxide in 100 lbs of water then heat to 30 degress C. what is the partial pressure of the sulfur dioxide over the solution specified?
Saturday, April 13, 2013 at 3:34pm
science-biology
Some herbicides, such as 2, 4-D are believed to make plant cells divide more rapidly than normal. Why would this kill plants? Why might this be dangerous to humans if it had the same effect on human cells?
Saturday, April 13, 2013 at 3:19pm
life science
discuss 5 ways in which the human or environmental problem impacts on the community?
Saturday, April 13, 2013 at 8:23am
SCIENCE ASAP please
1. Density is the relationship between ____. (1 point) mass and volume cubic centimeters and pounds weight and volume grams and mass 2. Which of the following is NOT a possible sign of a chemical change? (1 point) a change in state a change in color the release of a gas the ...
Friday, April 12, 2013 at 9:07pm
Science 8
Kinetic energy increases as a. mass increases and velocity decreases b. mass decreases and velocity increases c. both mass and velocity increase d. both mass and velocity decrease
Friday, April 12, 2013 at 8:37pm
science need help
using the punnet square one trait is Dd and the other is dd. 1) does the mother or father in a have dimples b) what percentage of children are likely to have dimples i think for a: it is the father because of the D so that it dominant and b:50 because two of the kids will have...
Friday, April 12, 2013 at 6:37pm
science
using the punnet square one trait is Dd and the other id dd. 1) does the mother or father in a have dimples b) what percentage of children are likely to have dimples i think for a: it is the father because of the D so that it dominant and b:50 because two of the kids will have Dd
Friday, April 12, 2013 at 6:10pm
Science Check answer
Key: ☺ = My Answer! 1. The thermal energy of an object is _____. its potential energy its average kinetic energy ☺ its potential energy minus its kinetic energy its kinetic energy plus its potential energy 2. A device that can be used both for cooling and heating ...
Friday, April 12, 2013 at 4:03pm
environmental science
is plastic use is more hazarduous or wood use in relation to their environmental impacts? kindly give me a detailed answer
Friday, April 12, 2013 at 3:48pm
Science
A car weighing 24,500 Newtons is traveling east and travels a distance of 100 meters in 20 seconds. What is the car's mass? What is the car's kinetic energy?
Friday, April 12, 2013 at 2:54pm
physical science
How much energy is stored in a 9V battery rated at 10 A hour?
Friday, April 12, 2013 at 12:47am
home economics, life science, mathematics and tourism
What career is ther when taking those subjects
Thursday, April 11, 2013 at 11:45pm
Science
How does gravity help keep satellites in orbit?
Thursday, April 11, 2013 at 10:29pm
science
In DC which wire will lose more enrgy 5m copper or 5m aluminium?
Thursday, April 11, 2013 at 10:07pm
Science URGENT~
1. Your ____ is your first line of defense against pathogens. (1 point) brain heart large intestine skin 2. Blood vessels help regulate your body's temperature. When it's cold, your blood vessels ____ to decrease blood flow and retain heat. (1 point) boil constrict ...
Thursday, April 11, 2013 at 9:57pm
science
getting ready to turn this in just want to check my answers any takers?? 1. In an atom, electrons ____. (1 point) are located in the nucleus are paired with neutrons are located in the electron cloud are always in the same place 2. The maximum number of electrons in the second...
Thursday, April 11, 2013 at 9:56pm
Physical Science
How does gravity help keep satellites in orbit?
Thursday, April 11, 2013 at 9:03pm
science
The _____ is an example of a joint that allows little to no movement, called a(n) _______ joint. (1 point) pelvis; immovable skull; movable ball-and-socket; movable vertebrae; immovable My Answer: 1)D Is this correct?
Thursday, April 11, 2013 at 3:35pm
science
A satellite completes one revolution of a planet in almost exactly one hour. At the end of one hour, the satellite has traveled 2.0 × 107 meters and is only 10 meters away from its starting point. What is the numerical value of the satellite's average velocity after ...
Thursday, April 11, 2013 at 1:41pm
physical science
What is the density of a suitcase that has a mass of 25 g and a volume of 13 cm3? Formula: Density = Mass/Volume
Thursday, April 11, 2013 at 1:19pm
science
You are a maker of hot air balloons and wish to construct a balloon that will lift you and a friend to places unknown. Your standard balloon design is a perfectly spherical, nylon fabric balloon with a small hole on the bottom for the burner that heats the air. Nylon starts to...
Thursday, April 11, 2013 at 12:10pm
Science
How does friction slow down a moving object — for example, a soccer ball?
Wednesday, April 10, 2013 at 11:16pm
science
If a population is not in genetic equilibrium, what must be occurring in the population
Wednesday, April 10, 2013 at 11:06pm
Science Please Help
Explain how heat is transferred between a hot and a cold object by conduction — for example, a warm foot on a cold floor.
Wednesday, April 10, 2013 at 11:04pm
Science
You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity?
Wednesday, April 10, 2013 at 10:52pm
Science
A fixed, single pulley that is used to lift a block does which one of the following? A. doubles the force required to lift the block B. decreases the force required to lift the block C. makes the block easier to lift by changing the direction of the force needed to lift it D. ...
Wednesday, April 10, 2013 at 10:15pm
Science
A flask contains 0.528 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.200 M NaOH. 32.5 mL of the NaOH is titrated into the flask. What is the molar mass of the acid (assuming it is diprotic and that the end point corresponds to ...
Wednesday, April 10, 2013 at 6:51pm
Help math!!
15 students took a science test. the average score was 88.0. later in the day a sixteenth student took the same test and scored a 92. the teacher recalculated the class average using all 16 of the scares. by how much will the class average have increased? show your work.
Wednesday, April 10, 2013 at 6:37pm
7th grade science
Q: A pair of fruit flies reproduces and has 1000 offspring. All 1000 of the offspring have the alleles Gg. What is the most likely combination of alleles that each parent has, and why are other combinations not likely?
Wednesday, April 10, 2013 at 6:30pm
math
15 students took a science test. the average score was 88.0. later in the day a sixteenth student took the same test and scored a 92. the teacher recalculated the class average using all 16 of the scares. by how much will the class average have increased? show your work.
Wednesday, April 10, 2013 at 6:16pm
Computer Science
A memory in 64bit architecture has size 1,024Mbytes (note that 1,024 = 2^10). 1)How many 64-bit words is its capacity? How much is this capacity in bits? How much is the same capacity in bytes? 2)How many cells does this memory have? If we want to be able to reference every ...
Wednesday, April 10, 2013 at 4:58pm
science
a 60.0kg boy runs up the stairs of a football stadium to a height of 12m above the ground 15s.what are the work and power student has done
Wednesday, April 10, 2013 at 4:57pm
science
1)What is the role of accessory pigments like the carotenoids? 2)What is the variable that causes pigments to separate in chromatography? How many different pigments might be identified through the separation process?
Wednesday, April 10, 2013 at 4:10pm
Science
What are some of the effects of the sun's radiation on the earth's atmosphere including the green house effect, conduction, convection and radiation?
Wednesday, April 10, 2013 at 3:49pm
science
Assuming that a population is mating randomly, no mutation or gene flow is occurring, calculate the frequencies of the two alleles for the five generations shown in the table below. Generaton #AA #Aa #aa p q Initial (P1) 42 46 12 0.65 0.35 F1 40 45 15 (?) (?) F2 38 49 13...
Wednesday, April 10, 2013 at 12:58am
Science 1 question
Choose and describe 2 interesting uses of electricity. I chose an electric car but im having trouble choosing the other one. Please give me good examples so I could choose. Thanks :)
Wednesday, April 10, 2013 at 12:04am
science questions true or false!
5. Air is a good conductor of heat. (1 point) true false 6. When you hold a ball above the ground it has kinetic energy. (1 point) true false 7. A good refrigerant must have a low boiling point. (1 point) true false
Tuesday, April 9, 2013 at 8:11pm
science 3 questions!!
2. A device that can be used both for cooling and heating is a _____. (1 point) heat engine compressor heat pump vaporizer 3. All objects emit _____ radiation. (1 point) electromagnetic kinetic thermal solar 4. Fast food restaurants keep food hot with infrared lamps. The heat ...
Tuesday, April 9, 2013 at 8:07pm
Science ASAP please
1. Which of the following is an example of density? (1 point) ice floating on top of a river convection currents that cause wind oil spill cleanup all of the above 2. What type of property is density? (1 point) chemical property size-independent physical property all of the ...
Tuesday, April 9, 2013 at 8:05pm
science 8th grade
1. The thermal energy of an object is _____. (1 point) its potential energy its average kinetic energy its potential energy minus its kinetic energy its kinetic energy plus its potential energy Thanks, jessica :)
Tuesday, April 9, 2013 at 8:05pm
Science 2 questions
how and where is electricity generated in British Columbia, Canada? describe how most of the electricity is generated in England or another country. But it must be different than what occurs in B.C. Please help, thanks:)
Tuesday, April 9, 2013 at 7:37pm
science
describe the path of light rays from a leaf to the retina
Tuesday, April 9, 2013 at 4:35pm
science
explain the priniciples of light thaat enable the convex lens to function as it does
Tuesday, April 9, 2013 at 4:35pm
Science
Please please help this is the second time I have posted this question. Calculate the amount of work it will take to lift a lawn mower with a mass of 8kg onto the back of a truck which is 0.75m off the ground.show all conversions in your work.
Tuesday, April 9, 2013 at 3:23pm
science
A hydraulic jack is needed to raise an object with a force of 4000 N to a height of 3 metres above the ground. Will the jack do the job? (Answer after working through the rest of the question. I would really appreciate it if someone would please help me with this question. ...
Tuesday, April 9, 2013 at 12:47pm
social science statistics
a professor was curious to whether the students in a very large class she was teaching who turned in their first scored differently from the overall mean on the test.The overall mean score on the test was 75 with a standard deviation of 10;the score were approximately normally...
Tuesday, April 9, 2013 at 11:33am
Science
Person weighing 650N lies on a bed of nails,each nail has area of 1m2 Assume 4Nm^-2 pressure is painful what is the smallest number of nails they could lay on and not be hurt
Tuesday, April 9, 2013 at 6:24am
science
Do temperatures get warmer or colder as you move from the lower stratosphere to the top of that layer?.And how big is the change?.
Tuesday, April 9, 2013 at 1:12am
science
A biochemist used 10.000 grams of P-32 in a test on plant growth but forgot to record the date of his experiment. When he measured the amount of phosphorus-32 on another day, he found only 1.250 grams of the isotope remaining. If the half-life of P-32 is fourteen days, when ...
Monday, April 8, 2013 at 9:01pm
Physical science
According to the law of the conservatives of mass, if the products o a reaction have a mass of 64.0 g, then the total mass of the reactants:
Monday, April 8, 2013 at 8:43pm
science
1. _____ is the process by which food is broken down so that nutrients can be used by the body. (1 point) Absorption Digestion Elimination Ingestion 2. What type of digestion takes place in the mouth? (1 point) chemical mechanical chemical and mechanical neither chemical nor ...
Monday, April 8, 2013 at 7:51pm
stat probability
At a certain college, there were 780 science majors, 320 engineering majors, and 390 business majors. If one student was selected at random, the probability that they are a business major is?
Monday, April 8, 2013 at 7:38pm
Science
Two parents have three children. They have two girls and one boy. What is the probability that the next child will be a boy?
Monday, April 8, 2013 at 6:52pm
science
With the class watching from a safe (and dry!) distance below, suppose the student drops the balloon and the balloon hits the sidewalk with a force of 20 N. How much work was done on the sidewalk by the balloon?
Monday, April 8, 2013 at 6:38pm
Science --
If you mixed 25.00g of salt in 100.00mL of water and it all dissolved, what would the concentration be in g/mL?
Monday, April 8, 2013 at 6:18pm
science/math
A barrel contains 15 liters of water. After a boulder is dropped into the water, the reading on the barrel is 22 liters. What is the volume of the boulder?
Monday, April 8, 2013 at 5:47pm
Science
Describe what happens to body systems over time from infancy to adulthood to older adulthood. In your own words please. thank you guys ;)
Monday, April 8, 2013 at 5:24pm
Science ms sue please help
A horse and a donkey can mate with each other. Their offspring,called a mule, is not fertile. Do horses and donkeys belong to the same species? Explain your answer. A scientist collects wild rabbits that live at sea level and moves them to the mountains. One year later, the ...
Monday, April 8, 2013 at 5:20pm
Science
PLEASE HELP MY DAUGHTER WANTS ME TO CHECK HER HOMEWORK AND I DON'T KNOW TO MUCH ABOUT SCIENCE LOL! BUT PLEASE HELP PLEASE PLEASE HELP ME PLEASE 'IN YOUR OWN WORDS PLEASE' PLEASE PLEASE PLEASE 'IN YOUR OWN WORDS' IN YOUR OWN WORDS PLEASE' I'M BEGAN ...
Monday, April 8, 2013 at 5:00pm
physical science
The orbital velocity of an earth satellite in an orbit 400 mi above the earth?
Monday, April 8, 2013 at 4:59pm
science P2
calc the volume of solution that contains 5,3 g of sodium carbonate if the solution has a concentration of 0,4 mol-dm (to the power of minus 3)
Monday, April 8, 2013 at 4:34pm
physical science chemistry
calculate the mass of sodium nitrate needed to make 550 ml of solution of concentration 0;2 mol.dmc to the power of minus 3
Monday, April 8, 2013 at 4:29pm
Algebra 2
A teacher is choosing 4 students from a class of 30 to represent the class at a science fair. In how many ways can the teacher choose the students?
Monday, April 8, 2013 at 4:21pm
Life science, history, geography, and maths literacy
I'm in grade 11 and i was wondering if you could help me with this question. I'm doing those subjects and i would love to take a career that is linked in those subjects, what would they be?
Monday, April 8, 2013 at 4:09pm
science
10 students whose combined mass is 700 kg ride down 30 m in a elevator. How much thermal energy is produced in the elevator system by the loss in gravitational potential energy of the students
Monday, April 8, 2013 at 4:01pm
Please help science
Most organisms reproduce: Sexually Asexually By meiosis Is it asexually or sexually not sure I think it is asexually though
Monday, April 8, 2013 at 2:53pm
jardan high. general science
water,anchorge,photosynthesis,mineral,food,support. The main functions of roots are { } and taking in { } and { }. The stems { } the other parts of the plant and transport { },{ } and around the plant.the leaves are the main part making { } by { }.
Monday, April 8, 2013 at 2:43pm
Science
When 2 resistors, R1 and R2 are connected in series across a 6V battery the potential difference across R1 is 4V. When R1 and R2 are connected in parallel to the same battery the current through R2 is 0.45 A. Find the values of R1 and R2. Thanks :)
Monday, April 8, 2013 at 2:25pm
science
Suppose you hang an object of weight W by a string from a hanging spring scale, such as the kind used in some grocery stores. You then hang the scale with the object from the ceiling of an elevator. When the elevator is standing still, the scale will read the actual weight of ...
Monday, April 8, 2013 at 1:46pm
Science
A good refrigerant must have a low boiling point. true false I think it is true...?
Monday, April 8, 2013 at 12:37pm
Science
When you hold a ball above the ground it has kinetic energy. true false I think it is False - that is potential energy..right?
Monday, April 8, 2013 at 12:33pm
Science
Air is a good conductor of heat. true false I think it is false...?
Monday, April 8, 2013 at 12:29pm
Science
Fast food restaurants keep food hot with infrared lamps. The heat is transferred to the food by _____. condensation conduction convection radiation I think it is radiation...?
Monday, April 8, 2013 at 12:25pm
Science
All objects emit _____ radiation. A.electromagnetic B.kinetic C.thermal D.solar I think it is A...?
Monday, April 8, 2013 at 12:21pm
Science
What is the mass of LiF in 100.0mL of 0.10M solution?
Monday, April 8, 2013 at 12:16pm
Science
Most organisms reproduce: A. Sexual B. asexual C. By meiosis Is it b not sure between b and a
Monday, April 8, 2013 at 12:09pm
Science
A device that can be used both for cooling and heating is a _____. heat engine compressor heat pump vaporizer I think it is Heat pump..?
Monday, April 8, 2013 at 12:08pm
Science
Most microrganisms reproduce: A. Sexually B. asexually C. By meiosis A or B not sure
Monday, April 8, 2013 at 10:33am
science
1. _____ is the chemical reaction in cells that needs oxygen to release energy and produces carbon dioxide and water as waste. (1 point) Breathing Exhaling Inhaling Respiration 2. Lungs are masses of _____, grapelike clusters of tiny sacs that are surrounded by _____, where ...
Monday, April 8, 2013 at 12:22am
science
dr. halite combined sodium metal with chlorine gas to make sodium chlorine (table salt). The chemical reaction used up all of the metal and sll of the gas. If dr halite made 116 g of table salt and started with 68 g of chlorine gas, then how many grams of sodium metal did he ...
Sunday, April 7, 2013 at 11:33pm
LBCC
At a certain college, there were 780 science majors, 320 engineering majors, and 390 business majors. If one student was selected at random, the probability that they are a business major is?
Sunday, April 7, 2013 at 11:06pm
physical science
two cars 200meters apart drive towards one another. If one car travels at 12 meters/s and the other at 26 meters/s how long does it take for them to collide?
Sunday, April 7, 2013 at 10:45pm
Science
A newspaper story on AIDS reports that an allele (R) confers complete resistance to HIV when homozygous and that 1% of the human population is resistant (RR). The story also states that 20% of the population carries one copy of the resistance allele (i.e., is heterozygous). Is...
Sunday, April 7, 2013 at 9:39pm
Science
what should you consider when you plan a title for a graph?
Sunday, April 7, 2013 at 6:02pm
Science
A Family travels 200 km in two hours and 20 min .then they stop to eat lunch.After lunch they travel 300 km In Two 3 Hours and 40min.What is the average speed during the entire trip?
Sunday, April 7, 2013 at 5:53pm
science asap
Air pressure decreases as altitude increases ^ which one goes on the horizontal axis and which one goes vertical axis? how did you choose this scale? (This is for a line graph)
Sunday, April 7, 2013 at 4:18pm
science
energy produced from atomic reactions is called ________
Sunday, April 7, 2013 at 2:17pm
science
Cal the index of refraction for a medium in which the speed of light is 2.012*10^8 meter per seconds
Sunday, April 7, 2013 at 2:17pm
Science
Phenylketonuria (PKU) is a human metabolic disease caused by the recessive allele k. If 2 heterozygous carriers of the allele marry and plan a family of five children: a) what is the chance that all their children will be unaffected? b) what is the chance that four children ...
Sunday, April 7, 2013 at 2:05pm
Science
The following heats of formation are used to find the change in enthalpy for the formation of tin chloride in the following reaction Sn (s) + 2Cl2(g) --> SnCl4(l).Sn(s) + Cl2(g) --> Sn Cl2(l) DH = -186.2 kJSnCl2(s) + Cl2(g) --> SnCl4(l) DH = -325.1 kJWhat is the ...
Sunday, April 7, 2013 at 12:32pm
science
A train accelerates uniformly in a straight line at 0.3m/s from from rest. Calculate the velocity 15 seconds after its depature. Calculate the time taken to reach 30km/h and the distance covered by the train.
Sunday, April 7, 2013 at 8:46am
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