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October 23, 2014

Homework Help: Science

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Recent Science Questions

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science motion short answer
9. Provide three statements that demonstrate the importance of units when describing motion. (3 points) i dunno wut they r askin... so..... if u can help, 3 sentences would be gr8 pls help asp thx
Thursday, March 13, 2014 at 2:41pm

science (check answer?)
What does aluminum, germanium, and polonium have in common? A. They are gases. B. They have properties of metals and nonmetals. C. They are all metals. D. They have the same properties as the noble gases in the last column. (I think its B.)
Thursday, March 13, 2014 at 2:21pm

science
5. What is the net force acting on the object below? (1 point) its two 5N arrows pushing a block to the right, like this 5N -----> and the block is here 5N -----> and the block is here 0 N 5 N 10 N 25 N do u multiply, add or what???
Thursday, March 13, 2014 at 1:32pm

Science
What happens when yeast and hydrogen peroxide are mixed together? What happens when yeast, hydrogen peroxide, and dish soap are mixed together?
Thursday, March 13, 2014 at 1:31pm

science
3. A section of the Periodic Table of the Elements is shown. Based on the positions of the elements, the two elements that have the most similar chemical properties are — A. calcium and scandium B. calcium and titanium C. titanium and vanadium D. magnesium and calcium 4. ...
Thursday, March 13, 2014 at 12:56pm

Science
1. Of the following, the only change that is an example of a chemical change is — A. water evaporating from a puddle B. an iron nail rusting and turning an orange color C. a piece of paper being cut into smaller pieces D. a stick being broken in half 2. All of the ...
Thursday, March 13, 2014 at 12:49pm

8th Grade Science (Periodic Table)
1. What conclusions can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their properties? Properties of elements are related to atomic numbers. Properties of elements are related to ductility. Properties of...
Thursday, March 13, 2014 at 12:39pm

science one question
2.Which of the following would be affected if a soaring eagle changed direction but remained at a constant speed? acceleration only velocity only*** acceleration and velocity neither i dont think it would be acceleration since the eagle stayed at a constant speed... help asap??
Thursday, March 13, 2014 at 12:29pm

science one question?
3. Which of the following is an example of a SI unit for distance? (1 point) mile meter second inch
Thursday, March 13, 2014 at 12:01pm

Physical Science
X-rays can take pictures of your bones but visible light cannot. Explain why. Homework question, please and thank you!
Thursday, March 13, 2014 at 11:52am

Science
If you wish to warm 100 kg of water by 20° C for your bath, show that 8370 kJ of heat is required.?
Thursday, March 13, 2014 at 6:39am

Science
How do you do science homework????????????????????????????????​????????????????????????????????????????​
Thursday, March 13, 2014 at 1:51am

Science question, only 1
Which of the following explains why water is a limited resource? Water is present on Earth in a fixed amount that does not change. Water is degrading slowly with time. Only water not present in oceans is available for living things to use. Once it ends up as groundwater, water...
Thursday, March 13, 2014 at 12:31am

Science check my answers
Which of the following is not needed to make a model of the water cycle? an energy source water a closed container a drain Which of the following explains why water is a limited resource? Water is present on Earth in a fixed amount that does not change. Water is degrading ...
Wednesday, March 12, 2014 at 10:44pm

TO DrBob222 or any science helper
identify the following formulas as acids, bases or salts: HCH3COO NaCL H2CO3 C6H8)7 Mg(OH) NaOH KBr Sr(OH)2 HNO3 please help really urgent :) thanks :)
Wednesday, March 12, 2014 at 9:58pm

Science quick help needed
identify the following formulas as acids, bases or salts: HCH3COO NaCL H2CO3 C6H8)7 Mg(OH) NaOH KBr Sr(OH)2 HNO3 please help :) thanks :)
Wednesday, March 12, 2014 at 9:38pm

science
ok, so i saw somebody already put this question here a few min ago but the answer wuz confusing... 25. When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of –183°C and the other has a ...
Wednesday, March 12, 2014 at 9:01pm

Science... plz help~!
The popul Vuh indicates that the mayans valued
Wednesday, March 12, 2014 at 8:58pm

science, pls explain this!
25. When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of –183°C and the other has a boiling point of –253°C. Has a physical change or a chemical change occurred? Explain. (6 ...
Wednesday, March 12, 2014 at 8:28pm

please check(Social studies)
please check my answers thanks 1.B 2.C 3.B 4.B 5.C and D 1.How did the haitian revolution impact the history of the united states? A.It brought the united states into a war with spain over cuba. B.France no longer had haiti,so Napeleon was willing to sell louisiana. C.Slave ...
Wednesday, March 12, 2014 at 8:04pm

Science :(
4. Which of the following is not needed to make a model of the water cycle? an energy source water a closed container a drain 5. Which of the following explains why water is a limited resource? Water is present on Earth in a fixed amount that does not change. Water is ...
Wednesday, March 12, 2014 at 7:32pm

Science URGENT
Hi, I am working on stoichiometry and limiting reactant problems. I have worked through examples in my book and I did them right and can solve for the excess, however there is one problem in the book that has confused me. I don't understand why they identified the limiting...
Wednesday, March 12, 2014 at 5:42pm

Science asap
1. Which of the following describes the correct sequence of events during the water cycle? precipitation → condensation → evaporation → runoff condensation → precipitation → runoff → evaporation runoff → condensation → ...
Wednesday, March 12, 2014 at 5:30pm

Science
Hi, I am working on stoichiometry and limiting reactant problems. I have worked through examples in my book and I did them right and can solve for the excess, however there is one problem in the book that has confused me. I don't understand why they identified the limiting...
Wednesday, March 12, 2014 at 4:35pm

Science 6th grade Earth's day and night ANSWERS
1. how does earth's rotation cause day and night? (1pt) As the earth rotates toward the east the sun appears to rise in the east and set in the west. 2.Roughly how many times does the earth rotate during each complete revolution? (1pt) 365. 3. Saturn's day is roughly ...
Wednesday, March 12, 2014 at 4:30pm

Science
which of the two conditions listed below are usually necessary in order for a fossil to form? possession of hard parts thick mud**************************** entrapment in oil rapid burial************************* Answers: 1. B and D Thank You.
Wednesday, March 12, 2014 at 3:23pm

Science
Is this correct. True or False. You can produce lower pressure by decreasing the area a force acts on. I think it is true.
Wednesday, March 12, 2014 at 2:19pm

Science
How many ice ages do scientist estimate have occurred during the last billion years? 3 5************************************* 6 7 How often do scientists say that recent cycles of advancing and retreating ice sheets occur? approximately every 100,000 years******* approximately...
Wednesday, March 12, 2014 at 2:09pm

Science
Which of the following is NOT a common landform caused by the passing of a glacier? Drumlins Esker Moraine Steppe ******************** There are sometimes flowing rivers within a glacier. True *************************** False Glaciers form and grow when the snowfall from one ...
Wednesday, March 12, 2014 at 1:55pm

PLS HELP ASAP 1 SUPER HARD & ANNOYING QUESTION
Use the diagram to answer question 13. so substance A looks like a row of three little circles on the top and bottom all organized (total six dots). substance b is all clumped together circles and is disorganized. 13. How can substance A and B be compared? Choose all that ...
Wednesday, March 12, 2014 at 1:47pm

PEOPLE, SCIENCE, AND THE ENVIRONMENT
. If all life ceased on Earth, how quickly would the atmosphere become like that of Venus and Mars? Explain.
Wednesday, March 12, 2014 at 1:34pm

Science... plz help~!
If a 40 kg person is accelerating at 10 m/s^2, then the magnitude of the force acting on him or her is 400 N. (1 point) True False
Wednesday, March 12, 2014 at 1:11pm

STATISTIC HELP
1.M&M candies are great for probability. The following tables are the color distributions for the candies. Fill in each table with the missing probability and answer the questions that follow. Plain Brown Blue Green Orange Red Yellow Probability 0.3 0.1 0.1 0.1 0.02 ??? ...
Wednesday, March 12, 2014 at 1:08pm

science help
What causes hurricanes to form in central america and the caribbean? A.trade winds B.extreme heat C.lack of cloud cover D.drought
Wednesday, March 12, 2014 at 12:44pm

SCIENCE HELP ASAP PLZ! ONLY ONE QUESTION!!!!!!!!
which of the following is not a benefit provided by a social group a) instinct to run from predators b) access to mate c) protecting young d) learning to recognize predators
Wednesday, March 12, 2014 at 12:44pm

SCIENCE HELP ASAP ONLY ONE QUESTION!!!!!!!!!!!!!!!
which of the following is an example of corporate behavior A) a lion hunting a zebra B) Two male peacocks fighting over a female peacock C) A hyena stealing a cheeta's kill D) a bluejay calling to signal the presence of a hawk
Wednesday, March 12, 2014 at 12:42pm

SCIENCE HELP ASAP PLZ!
Which of the following helps ensure a group’s access to resources it needs for survival? A) courtship ritual B) hibernation C) conditioning D) territorial behavior
Wednesday, March 12, 2014 at 12:37pm

science(check answers)
2.C 3.A 2.Harvesting energy from water,wind,and geothermal vents requries the use of A. aquaculture B.engines C.mines D.turbines 3.which of the following is not among the advantages of generating nuclear energy? A.It does not release carbon dioxide into the atmosphere. B.it ...
Wednesday, March 12, 2014 at 11:56am

science(check answers)
1.A 2.A 3.D 4.C 1.Is the following statement true or false?Solar panels collect energy from the sun that can then power a lamp in a home. A.True B.False 2.Harvesting energy from water,wind,and geothermal vents requries the use of A. aquaculture B.engines C.mines D.turbines 3....
Wednesday, March 12, 2014 at 11:23am

science(check answers)
5.B 7.C 5. The process of desertification can occur when A. plants usually found in the desert replace trees that have been cut down B. farmers use contour farming techniques C.an area of forest is clear-cut D.an area of forest is selectively cut 7. Which of the following ...
Wednesday, March 12, 2014 at 12:13am

Science
Which of the following is NOT a way that machines provide a mechanical advantage? a.change direction b.change distance c.change power d.change force
Wednesday, March 12, 2014 at 12:08am

science(check answers)
1.True 2.A 3.B 4.C 5.C 6.B 7.C 8.D 1. Aquaculture is the practice of farming sea organisms as a renewable food source. A. True B. False. 2. Selectively cutting down trees on an area of land can be best described as A. cutting down certain trees while leaving other trees ...
Tuesday, March 11, 2014 at 11:36pm

Science
May someone please explain the process of respiration of animals.
Tuesday, March 11, 2014 at 11:16pm

science(check answers)
i dont think the answer could be A. so i pick B. One reason people around the world use coal as an energy source is: A. It is nonrenewable. B. it can be found many places C. it is a fossil fuel D. it cannot be used up
Tuesday, March 11, 2014 at 11:01pm

science(check answers)
1.D One reason people around the world use coal as an energy source is: A. It is nonrenewable. B. it can be found many places C. it is a fossil fuel D. it cannot be used up
Tuesday, March 11, 2014 at 10:57pm

science(check answers)
1. A 2. C 3. A 4. D 1. Coal, oil, and natural gas are inexpensive sources of fuel which do not cause pollution when used. A. true B. false 2. One reason people around the world use coal as an energy source is: A. It is nonrenewable. B. it can be found many places C. it is a ...
Tuesday, March 11, 2014 at 10:44pm

science
if electrons are caused to fall through a potential difference of 100000 volt,determine their final speed if they were initially at rest.
Tuesday, March 11, 2014 at 10:13pm

Science
what mass of sulphuric acid must be added to a 750 ml to have a ph of 2.27
Tuesday, March 11, 2014 at 10:01pm

science
Can u unscramble these letters into a word? ATSETLECTOICNP
Tuesday, March 11, 2014 at 9:40pm

science(check answers)
please check my answers 1. B 2. A 3. D 4. A 1.B 2.A 3.D 4.A 1.All renewable resources are inexhaustible A.true B.false 2.Some fuels,called biofuels,are made from plants.They are used in cars and other machines biofuels would fit best in which of the following categories A. ...
Tuesday, March 11, 2014 at 9:04pm

science(check answers)
please check my answers 1. B 2. A 3. D 4. A 1.B 2.A 3.D 4.A 1.All renewable resources are inexhaustible A.true B.false 2.Some fuels,called biofuels,are made from plants.They are used in cars and other machines biofuels would fit best in which of the following categories A. ...
Tuesday, March 11, 2014 at 8:18pm

science
Are there important aspects of your personality that were not addressed by this questionnaire? If so, which ones? just make up something. answer in detail regarding hexaco inventory
Tuesday, March 11, 2014 at 6:11pm

science
How accurately do you think your best friend or a close family member would be able to answer these questions about you? Are there some aspects of your personality that are more private than others? answer in detail regarding hexaco inventory
Tuesday, March 11, 2014 at 6:10pm

science
What personality traits do you think this hexaco inventory measured? answer in detail
Tuesday, March 11, 2014 at 6:07pm

science
3. Liquefied air (assuming it is only O2 and N2) is kept in a container where pressure and temperature can be controlled. a. What is the maximum temperature at which the mixture exists as a liquid? If this temperature is kept constant, what is the minimum pressure to keep the ...
Tuesday, March 11, 2014 at 2:13pm

Statistic Please Check
Check this out please Thanks Lesson 3 Unit 2 Probability Couplements, Disjoint Events and the addition Rule 1.M&M candies are great for probability. The following tables are the color distributions for the candies. Fill in each table with the missing probability and answer the...
Tuesday, March 11, 2014 at 11:44am

Science :(
Which of the following describes the correct sequence of events during the water cycle? precipitation → condensation → evaporation → runoff condensation → precipitation → runoff → evaporation runoff → condensation → evaporation...
Tuesday, March 11, 2014 at 10:44am

Science Help PLEASE!!
1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water and groundwater during...
Tuesday, March 11, 2014 at 10:15am

science
2. Alex, a fresh graduate chemical engineer, started his job by a mission requested by his boss. He was supposed to prepare a small amount of ethylene in the lab, to use it later for polyethylene synthesis. His boss, OE, also known as “The Monster” did not provide ...
Tuesday, March 11, 2014 at 1:52am

science
Calculate the mass percent composition of each element in each compound.
Monday, March 10, 2014 at 8:43pm

Science
If 33.7 grams of LiOH dissolve in enough water to make a 231-gram solution, what is the concentration in percent by mass?
Monday, March 10, 2014 at 5:38pm

Please Help Me :( Science: Biology, Genetics!
Please help me with science genetics questions? Thanks to all who answer!! :) 1. Chromosome pairs contain different versions of genes, which are called ________. 2. The process in which body cells are duplicated in order to grow and repair body tissues is called _____________...
Monday, March 10, 2014 at 5:22pm

Science, Genetics
Please help me with science genetics questions? Thanks to all who answer. :) 1. Chromosome pairs contain different versions of genes, which are called ________. 2. The process in which body cells are duplicated in order to grow and repair body tissues is called _____________. ...
Monday, March 10, 2014 at 4:28pm

science
In the following diagram, the greem ball changes direction after colliding with the red ball because the red ball has more momentum. True <---- False 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s <---- ...
Monday, March 10, 2014 at 3:37pm

Science
What is the formula to find density when weight is 90N, Vol is 45ml, Mass is 9.0g
Monday, March 10, 2014 at 3:30pm

science
Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location.
Monday, March 10, 2014 at 2:43pm

Science help
A student combined water, sugar, and salt into a beaker. Which of the following statements are true? a. The individual substances can be separated by physical means.** b. The individual substances cannot be separated by physical means. c. A new substance is made of two or more...
Monday, March 10, 2014 at 2:11pm

science
Every year Eli and his family visit Great sand dunes desert in Colorado.Elliott notices that more dunes with varied shapes and sizes appear each year.Explain what causes phenomenon.
Monday, March 10, 2014 at 1:58pm

life science,history,maths literecy and economic
what careers can i from those subjects
Monday, March 10, 2014 at 1:29pm

science
If a farmer plants the same crop in a field year after year the soil becomes less fertile. What causes this decrease in fertility ? a) erosion b) lack of water c) loss of topsoil d) loss of nutrients How do decomposes increase the fertility of soil ? a) by storing moisture in ...
Monday, March 10, 2014 at 12:36pm

science
1. Which of the following is evidence that groundwater cause erosion and deposition ? a) the formation of meanders b) the formation of large boulders in the desert c) the formation of alluvial fans d) the formation of stalagmites and stalactites in caverns 2. The mas of rock ...
Monday, March 10, 2014 at 12:34pm

science
A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0m/s2. If the cart has a beginning speed of 2.0m/s what is its final speed?
Monday, March 10, 2014 at 10:30am

programming
Write an algorithm to compute average score for each student in the Computer Science Continuous assessment test. Assume each student sat for ten courses for the semester
Monday, March 10, 2014 at 8:31am

SCIENCE CAN ANYONE HELP
A.) Show how vertical multiplication can be used to do a charge balance if Zn2+ combines with Cl- b.) Write the chemical formula name for the compound that would be formed I've been waiting for hours and I haven't even received any help...
Sunday, March 9, 2014 at 7:29pm

Science urgent
A.) Show how vertical multiplication can be used to do a charge balance if Zn2+ combines with Cl- b.) Write the chemical formula name for the compound that would be formed
Sunday, March 9, 2014 at 5:30pm

Science
Hello. I have this question for my class. We were to mix Na2S2O3 to a a test-tube with Varsol layer on top and an Aqueous layer (of I2/KI) on the bottom. I observed a lighter colour change in both layers. How would I express that as a chemical equation? Also, I added saturated...
Sunday, March 9, 2014 at 5:21pm

integrated science
find the resultant force on a .150kg baseball if gravity is pulling down and it is hit at a 45 degree angle with 50N of force by a baseball bat.
Sunday, March 9, 2014 at 5:19pm

science
An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?
Sunday, March 9, 2014 at 4:51pm

science
A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
Sunday, March 9, 2014 at 4:50pm

science
How does ozone gas to int get into the earth?
Sunday, March 9, 2014 at 3:21pm

science
An aerosol can contains gases under a pressure of 4.6 atm at 18◦C. If the can is left on a hot sandy beach, the pressure of the gases increases to 4.69 atm. What is the Celsius temperature on the beach
Sunday, March 9, 2014 at 3:09pm

science
What pressure is required to reduce 75 mL of a gas at standard conditions to 11 mL at a temperature of 27 ◦C? what pressure would i use?
Sunday, March 9, 2014 at 3:08pm

science
A gas occupying 43 mL at standard conditions is heated to 29 celsius while the pressure is reduced to 0.84091 atm. What is the new volume occupied by the gas?
Sunday, March 9, 2014 at 2:24pm

science
As seen in the lab frame a rocket A is moving to the right with speed c  and rocket B is moving to the left with speed c  . The pilot of rocket B fires a laser beam. In the B-frame, the laser beam points in the x-y plane and makes and angle =53.13˚...
Sunday, March 9, 2014 at 12:45pm

science
A distant spaceship carrying a red headlight, emitting light with wavelength 600nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200nm. What is the velocity of the spaceship? b) As the space ship ...
Sunday, March 9, 2014 at 12:44pm

physical science
A horizontal force of 10 Newtons acts on a 2 kg block on a level surface.The frictional force between the block and the surface is 3 Newtons.What is the magnitude and the direction of the net force acting on the block?
Sunday, March 9, 2014 at 12:37pm

science
A decrease in “food miles” will most likely increase the environmental impact of any given food.
Saturday, March 8, 2014 at 10:23pm

Physical Science
Describe convection in a room heated by a radiator.
Saturday, March 8, 2014 at 3:50pm

Engineering science
A brick with a mass of 6kg is dropped vertically from a certain height.it takes 4,5 seconds for the brick to reach the ground.determine the ff.the height from which the brick is dropped and potential energy of the brick
Saturday, March 8, 2014 at 3:39pm

Physical Science
22. Why does a heat pump need an external source of energy (such as electrical energy)?
Saturday, March 8, 2014 at 2:37pm

Algebra
On Monday, it took Helen 3 hours to do a page of science homework exercises. The next day she did the same number of exercises in 2 hours. If her average rate on Monday was p exercises per hour, what was her average rate the next day, in terms of p? I know that the answer is 3...
Saturday, March 8, 2014 at 10:38am

science
I'm instructed to wrtie a full lab raport for a lab I did a couple of months ago. My aim was to find the most efficient concentration of fertilizer to grow red lentils. I planned to do this by taking the average of the number of lentils sprouted each day for eight days and...
Saturday, March 8, 2014 at 9:18am

Science
Two identical twins marry two identical twins. Will their offspring look the same?
Friday, March 7, 2014 at 11:23pm

physical science
An airplane trvels with a velocity of 200 mi/h in a direction 30 deg. west of north of 1.50 h. How far north and how far west is it from its starting point?
Friday, March 7, 2014 at 8:49pm

Science- help asap plz
think about the role that trees play in the water cycle. what are two of the ways in which they are part of the cycle?
Friday, March 7, 2014 at 6:05pm

Science- still waiting
Give 2 examples for each state of fresh water: a) solid b)liquid c) vapour?
Friday, March 7, 2014 at 5:36pm

Science- HELP Please!
provide three statements that demonstrate the importance of units when describing motion.
Friday, March 7, 2014 at 5:08pm

Science
provide three statements that demonstrate the importance of units when describing motion.
Friday, March 7, 2014 at 4:46pm

Science
provide three statements that demonstrate the importance of units when describing motion.
Friday, March 7, 2014 at 4:17pm

Science
Give 2 examples for each state of fresh water: a) solid b)liquid c) vapour?
Friday, March 7, 2014 at 3:12pm

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