Wednesday
April 1, 2015

Homework Help: Science

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Recent Science Questions

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career help
one year ago This degree program is designed to prepare students to enter a career upon completing the degree with no further study required. Some are transferable to a state university program to continue education. Associate in Arts (AA) Associate in Science (AS) Associate ...
Wednesday, April 1, 2015 at 3:09pm

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof ...
Wednesday, April 1, 2015 at 12:27pm

Science
Portfolio: you will design an experiment to investigate the relationship between the number of cool loops and the strength of a solenoid. Once you have an experiment plan carry out your experiment and record your data. After you have finished conducting the experiment, write a...
Wednesday, April 1, 2015 at 10:41am

science
a racer in a kayak travels a 300-meter river course at an average speed of 3 meters per second. how long does it take to complete the course?
Tuesday, March 31, 2015 at 8:33pm

science help.. pls help me dr.bob22 or damon
Sodium Chloride is formed when atoms lose and gain electrons Carbon monoxide is formed when atoms share electrons. In both substances atoms are held together by a(n) is it chemical bond pls help me
Tuesday, March 31, 2015 at 6:29pm

science help.. pls help me dr.bob22 or damon
In a water molecule, 2 atoms of hydrogen and 1 atom of oxygen share electrons. A _______ bond, is found in water molecule is it chemical bond pls help me
Tuesday, March 31, 2015 at 6:24pm

science help.. pls help me dr.bob22 or damon
Dalton's ideas that atoms cannot be divided into smaller parts was disproved by the discovery of the_____ is it electrons
Tuesday, March 31, 2015 at 6:20pm

science help.. pls help me dr.bob22
A metal from group 1 and a nonmetal from group 17 are? A. Not likely to bond B. Likely to form a covalent bond C. Likely to form a ionic bond D. Likely to form a metalloid is it c pls help me pls help me
Tuesday, March 31, 2015 at 6:17pm

pls help me dr.bob22 science
Which of the following demonstrates that reactants and products are chemically different? A.Zn + 2HC1 = 2HCl + Zn B. Zn 2HCl = H2 + 2 nCl2 C. H20 + C4H10 = H20 + C4H10 D. C4H10+ H20= C4H10 +H20 is it b pls help me
Tuesday, March 31, 2015 at 6:10pm

pls help me dr.bob22 science
Which of the following would likely be part of an ionic bond? Choose all that apply. *K+1 *Cl2 *F-1 *Ne is it a and b
Tuesday, March 31, 2015 at 6:08pm

science help check
3. A metal from group 1 and a nonmetal from group 17 are? A. Not likely to bond B. Likely to form a covalent bond C. Likely to form a ionic bond D. Likely to form a metalloid is it c pls help me
Tuesday, March 31, 2015 at 6:02pm

science help
How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? choose all that apply. -Transition metals -noble gases -group 6, period 4 -group 4, period 6 pls help me damon or ms sue pls help me pls pls pls
Tuesday, March 31, 2015 at 5:52pm

science
a life cycle in which organisms switch back and forth between diploid and haploid stages
Tuesday, March 31, 2015 at 4:53pm

science
The alleles for brown eyes (B) are dominant, while those for blue eyes (b) are recessive. If Lesley’s mother has the genotype BB and her father has the genotype bb, what is Lesley’s genotype? What is her phenotype?
Tuesday, March 31, 2015 at 3:08pm

science PLZ HELP
electric charges that are different A) attract each other B) repel each other C) exist in pairs D) do not interact Magnetic field lines around a bar magnet A) are only perpendicular to the magnet B) spread out from one pole and curve around the other C) cross back and forth ...
Tuesday, March 31, 2015 at 2:29pm

Science
What is the concentration of NH3 in 0.250M solution of NH4Cl?
Tuesday, March 31, 2015 at 12:38pm

Physics
Which best explains why openness is important to the progress of science?
Tuesday, March 31, 2015 at 12:16pm

Physical science
A 478.18g ice cube is taken out of the freezer at -8.5 degrees Celsius. how much heat s needed to turn it in to steam?
Tuesday, March 31, 2015 at 11:57am

science
How many moles of li2so4 is required to prepare 300ml of a 0.5 m solution
Tuesday, March 31, 2015 at 7:41am

science
find the velocity with which it hits the ground when a body is projected horizontally from top of a tower 100 meter high with a velocity of 9.8 meter per second.
Tuesday, March 31, 2015 at 1:54am

Science help please!!
How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together. C. They cooled and pulled ice together. D. They began to rotate. Is the answer B? Thank you so much in advance.
Monday, March 30, 2015 at 11:22pm

7th grade math (probability)
I'm not sure how to answer this: 3. THe 7th grade wants to have a back-up representative just in case the first teacher is absent. Based on the same scenario as #2, if a math teacher was chosen to be the 7th grade representative, what is the probablility that the back-up ...
Monday, March 30, 2015 at 8:09pm

science help
a metal from group 1 and a nonmetal from group 17 are 1.) not likely to bond 2.) likely to form a covalent bond 3.) likely to form an ionic bond 4.) likely to form a metalloid is it 3 pls help me
Monday, March 30, 2015 at 7:02pm

science help
How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? choose all that apply. -Transition metals -noble gases -group 6, period 4 -group 4, period 6 pls help me damon or ms sue
Monday, March 30, 2015 at 7:00pm

science help
How many valence electrons does an atom of rubidium (Rb atomic number 37) have? A.One B.Five C.Six D.37 is it a pls help me ms sue or damon or anybody
Monday, March 30, 2015 at 6:55pm

Physical Science
A man loads 1,000 sacks of flour into a truck in 30 minutes. each sack has a mass of 20 kg and the man must lift each sack 1.00 m from a cart up onto the truck bed. How much power did the man develop?
Monday, March 30, 2015 at 6:30pm

science help
Which process of the carbon cycle is responsible for the release of carbon at the power plant, as shown by the arrow? combustion. photosynthesis. digestion. decomposition. 941080532013105759am498923097.jpg copy and paste this and you will see the picture.. look it up at google...
Monday, March 30, 2015 at 6:18pm

science help
According to the law of conservation of mass, what should the product side of this single replacement reaction look like? Zn+2HCl--->? A. H2ZnCl2 B. H2+Zn+Cl2 C. H2+ZnCl2 D. ZnCl2 Is the answer D? pls help me
Monday, March 30, 2015 at 6:04pm

science help
Hydrogen gas(H2) and chlorine gas(CL2) react to form hydrochloric acid (HCI). What is the correct balanced chemical equation for this reaction? is it H2 + Cl2 = 2HCl
Monday, March 30, 2015 at 6:02pm

science help
Sodium is a metal and chlorine is a poisonous gas. Neither is safe to eat. However, when sodium and chlorine combine, it produces edible table salt. What can be concluded? A. Table salt has similar physical properties of both reactants. B. Table salt is a metalloid with ...
Monday, March 30, 2015 at 5:56pm

science
A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15 g D. 17 g E. 32 g Is...
Monday, March 30, 2015 at 5:53pm

Science
How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite? A. 3 B. 23 C. 2 D. 10 I think its A.??
Monday, March 30, 2015 at 5:48pm

goegraphy,agriculture,life science and maths liter
Which career can I take with this subjects?
Monday, March 30, 2015 at 2:57pm

science
What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 60 m/s and a second 1500 kg car moving west at 95 m/s? Let east be the positive direction. Answer in units of kg · m/s.
Sunday, March 29, 2015 at 8:54pm

Computer science C++
A problem in timber management is to determine how much of an area to leave uncut so that the harvested area is reforested in a certain period. It is assumed the reforestation takes place at a known rate per year, depending on climate and soil conditions. A reforestation ...
Sunday, March 29, 2015 at 6:25pm

Computer Science
A problem in timber management is to determine how much of an area to leave uncut so that the harvested area is reforested in a certain period. It is assumed the reforestation takes place at a known rate per year, depending on climate and soil conditions. A reforestation ...
Sunday, March 29, 2015 at 5:57pm

Physical science
I Don't UnderThis . It Says V=55mph D=68mi T=?
Sunday, March 29, 2015 at 10:10am

Science just need checked
1. What is the salinity of seawater? 1.5 percent 3.5 percent*** 5.5 percent 10 percent 2. What is the most abundant salt in the sea? calcium chloride magnesium chloride potassium chloride sodium chloride*** 3. Most ocean water is located in which zone? mixed zone transition ...
Saturday, March 28, 2015 at 9:51pm

Science NOT A QUIZ
1. __________ is/are NOT an angiosperm because it does not _______. (1 point) Barley; produce fruit Wheat; produce seeds* Lentils; produce cones Ginkgoes; flower 3. The leaves of plants ____, while the roots of plants _____. (1 point) make food; store ...
Saturday, March 28, 2015 at 7:27pm

Science Check Thank You
1. __________ is/are NOT an angiosperm because it does not _______. (1 point) Barley; produce fruit Wheat; produce seeds* Lentils; produce cones Ginkgoes; flower 3. The leaves of plants ____, while the roots of plants _____. (1 point) make food; store ...
Saturday, March 28, 2015 at 5:02pm

Earth Space Science
the horizontal distance between a crest to the next trough of an ocean wave is 5 meters. what is the wavelength of the ocean wave? A)2 meters B)5 meters C)10 meters D)20 meters I think its 10 meters but im not so sure, I would like to make sure.
Saturday, March 28, 2015 at 4:23pm

Science
which of these statements provides evidence to the fact that oceans influence climate by transporting water from one place to another? A)warm ocean water off the east coast of Florida affects the climate of Europe. B)warm ocean water off the east coast of Florida affects the ...
Saturday, March 28, 2015 at 4:07pm

Science Please Help Me 2
2. Ferns are the most abundant of the _____ plants; and they produce _______ to reproduce. gymnosperm; sperm seedless vascular; spores* nonvascular; shoots vascular; seeds 3. Which of the following is a reason mosses never grow very tall? lack of cell ...
Saturday, March 28, 2015 at 1:17pm

Science Check Please
Which of these is true? The nervous system doesn't react as quickly as the endocrine system. The endocrine system doesn't react as quickly as the nervous system. (My Answer) The nervous system and the endocrine system have similar reaction times. The endocrine system ...
Saturday, March 28, 2015 at 11:53am

science
If a car has a constant acceleration of 4 m/s², starting from rest, how far has it travelled by the time it reaches the speed of 40 m/s?
Saturday, March 28, 2015 at 9:55am

science
I posted this under science because I see it occurring most under this subject. Many of the tutors here are very rude and useless at times. Honestly, if kids are on the internet seeking help for questions on their homework or whatever, they aren't going to suddenly know ...
Saturday, March 28, 2015 at 12:23am

math
75 pupils sat for a Science Test. The average score was 58 marks. If the average score of the girls was 62 marks and the average score of the boys was 56 marks, how many boys sat for the test?
Friday, March 27, 2015 at 9:14pm

Science
Salinity of the ocean A)is generally very low B)changes with climate C)decreases with increase in temperature D)increases where a river meets the ocean I think its A but I'm not sure I just want to make sure.
Friday, March 27, 2015 at 1:49pm

science
A golfer tees off and hits a golf ball at a speed of 31 m/s and at an angle of 35 degrees. How long was the ball in the air? Round the answer to the nearest tenth of a second.
Friday, March 27, 2015 at 12:19pm

physical science
a parachutist jumps from an aeroplane.he has a mass of 80kg.initially,he 'free-falls',before his parachute opens.what is his initial acceleration
Friday, March 27, 2015 at 6:21am

Science
When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is......
Thursday, March 26, 2015 at 9:26pm

Science
I need to write 10 sentences to this question: what do u think caused the little puddle of water to appear under the syringe! Please help to find 10 sentences on what caused the puddle
Thursday, March 26, 2015 at 6:24pm

science
If 23 g of ethanol (c2h5oh) is dissolved in 60 g of ethenoic acid (ch3cooh). Then find out the mole fraction of each component?
Thursday, March 26, 2015 at 12:48pm

Science
10. You analyze the gas in 100 kg of gas in a tank at atmospheric pressure, and find the Following : CO2;19.3%, N2;72.1%, O2;6.5%, H2O;2.1% What is the average molecular weight of the gas?
Thursday, March 26, 2015 at 8:16am

Science
A cellulose solution contains 5% cellulose by weight in water. It is to be diluted to 4.0 % using a 1% solution of cellulose in water. Determine the kilograms of 1% solution required to dilute 100 kg of the 5% solution.
Thursday, March 26, 2015 at 8:13am

Science
Find the density and specific gravity of the following (a) SO2 at 700F and 1 atm (b) Mixture of 10 mole% CH4 and 90 mole% argon at 5400C and 28.9 inch Hg (c) Air containing 0.045 lbm H2O per pound mass of dry air at 2000F and 29.7 in Hg absolute pressure
Thursday, March 26, 2015 at 8:12am

Science
The pressure guage on the steam condenser for a turbine indicates 26.2 in. Hg of vacuum. The barometer reading is 30.4 in. What the absolute pressure in the condenser in psia?
Thursday, March 26, 2015 at 8:11am

Science
1 kg of Nitrogen is mixed with 3.5 m3 of hydrogen at 300 K and 101.3 kPa and sent to ammonia converter. The product leaving the converted analyzed 13.7% ammonia, 70.32% hydrogen and 15.98% nitrogen. (a) Identify the limiting reactant? (b) What is the percent excess of the ...
Thursday, March 26, 2015 at 8:10am

Science
A Portland cement sample contained 20% SiO2 by weight derived from two silicate compounds. SiO2.2 CaO and SiO2. 3CaO that are present in the cement in the mole ratio 3:4. Determine the percent by weight of each silicate compound in the cement.
Thursday, March 26, 2015 at 8:09am

Science
A basketball is dropped from a height of 2m and has a rebound of only 1.5m. what happened to that energy that was lost?
Thursday, March 26, 2015 at 6:24am

reading and literature
which is hamlet by Shakespeare historical fiction, mystery, myth, science fiction, realistic fiction, allegory, parody, satire, or graphic novel.im thinking graphic novels
Thursday, March 26, 2015 at 2:59am

Computer science
How to convert from decimal to binary in matlab.....this is what I have so far..... dec = 43; i = 1; sum=0; while dec>0 r = rem(dec, 2); sum=sum+(i*rem); dec=dec/2; i=i*10; end sum
Wednesday, March 25, 2015 at 9:35pm

Science, genetics
Two pea plants are crossed. One is homozygous recessive for long (long is dominant and short is recessive) and the other is heterozygous. If 100 pea plant offspring are produced, how many of them will be long?
Wednesday, March 25, 2015 at 8:29pm

Earth science
how does the temperature of ocean currents affect climate?
Wednesday, March 25, 2015 at 6:43pm

Science
Meteoroids can form when comets break apart, creating dust clouds. True or False? I think it's true.
Wednesday, March 25, 2015 at 6:13pm

Physical Science
Calculate: In the following equation, 417.96 g of Bi (bismuth) reacts completely with 200 g of F (fluorine.) How many grams of BiF (little three below F) are formed? 2 Bi + 3 F (little 2 under F) ---> 2 BiF (little three below F)
Wednesday, March 25, 2015 at 5:56pm

Math/Science
How do you convert millimeters to micrometers? For 10 mm, I got .010 micrometers, but I'm not sure if that's right.
Wednesday, March 25, 2015 at 5:08pm

Science The Human Body PLEASE HELP!!!!!!!!!!!
the human endocrine system is made up of which of the following structures? (1 point) vessels receptors* glands chambers 2. Which of the following best describes the function of the endocrine system? (1 point) It secretes chemical messengers that travel through the blood to ...
Wednesday, March 25, 2015 at 4:54pm

Comprehensive Science
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. My answer: I ...
Wednesday, March 25, 2015 at 1:50pm

Physical science
which liquid evaporates fastest between water , ethanol , nail polish remover and methylated spirits
Wednesday, March 25, 2015 at 7:17am

science
how does amavasya and pournami occur.
Wednesday, March 25, 2015 at 4:27am

science
A bird flying west at 35m/s dives south at 35m/s. Did the bird’s velocity change, if so how?
Tuesday, March 24, 2015 at 10:31pm

Science
How can I find the potential difference? It's a parallel circuit. R1, R2 and R3 is 0.3 and the current is 8.0. Is the volts 8.8?
Tuesday, March 24, 2015 at 9:09pm

science
what is electrical deduction?
Tuesday, March 24, 2015 at 9:07pm

Science
Describe the life cycle of a parasite that relies on its host for part of its reproductive cycle. human and mosquito???
Tuesday, March 24, 2015 at 8:56pm

Science
1. Air masses that form over land would be mostly A. Warm B. Cold C. Dry* D. Wet 2. Air masses that form over oceans or seas would be mostly A. Warm* B. Cold C. Dry D. Wet 3. Air masses that form over northern locations would be mostly A. Warm B. Cold* C. Dry D. Wet 4. Air ...
Tuesday, March 24, 2015 at 8:49pm

Science
Describe the life cycle of a parasite that relies on its host for part of its reproductive cycle. I was thinking a mosquito and human but i don't know how to describe it.
Tuesday, March 24, 2015 at 8:23pm

Science
london england is approximately 51° north latitude 0° longitude. binghamton new york is about 42° north latitude 76° west longitude why does binghamton have colder winters?
Tuesday, March 24, 2015 at 6:31pm

Physical Science
I have no idea how to do this, and I'm not sure what the formula is. Here's my question: In space, there is almost no air, so there is virtually no friction. If an astronaut throws a ball in space with an initial velocity of 3.0 meters per second to the west, what ...
Tuesday, March 24, 2015 at 3:58pm

Science
A 2000 kg car is rolling at 3 m/s. You would like to stop the car by firing a 10 kg blob of sticky clay at it. How fast should you fire the clay? How much energy is required to accelerate the clay to this speed?
Tuesday, March 24, 2015 at 10:41am

science
a person rolled a large ball across a field. What information is needed t determine how much work the person did?
Tuesday, March 24, 2015 at 7:45am

Science
How does Science impact you? I said that it prepares you for a career in the medical field,gains knowledge... can you help me find 3 better reasons???
Monday, March 23, 2015 at 9:25pm

Physical science
An astronaut on a space walk bumps the shuttle and starts moving away at a velocity of 0.02m/s. The astronaut's mass is 100kg. He takes a 1kg "safety weight" and shoves it away in exactly the direction of his motion at a speed of 6m/s. at what speed does the ...
Monday, March 23, 2015 at 8:41pm

Science
Which has a greater total resistance, a series circuit or a parallel circuit and why? I know i have repeated this question again, but I need someone to help me..
Monday, March 23, 2015 at 7:40pm

Science Check Please Dr.Bob222
I am sorry would..Hopefully this would make it easier 1. Your ____ is your first line of defense against pathogens. 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...
Monday, March 23, 2015 at 7:24pm

science asap
1) How do decomposers increase the fertility of soil? A) By storing moisture in the soil. B) By breaking down and digesting the remains of dead organisms. C) By making spaces for air and water. D) By burrowing deep below topsoil. I am thinking is is either B or D, but I do not...
Monday, March 23, 2015 at 7:13pm

science
If I fire three arrows at 20 degrees, 40 degrees and 60 degrees, which arrow will go the farthest?
Monday, March 23, 2015 at 7:11pm

science
1) How do decomposers increase the fertility of soil? A) By storing moisture in the soil. B) By breaking down and digesting the remains of dead organisms. C) By making spaces for air and water. D) By burrowing deep below topsoil. I am thinking is is either B or D, but I do not...
Monday, March 23, 2015 at 6:45pm

Science
he current atomic model would be revised if A. better microscopes were being used to study its structure. B.better microscopes are invented in the future. C. new information about an atom's structure is discovered. D. a new element is discovered in the future I thiink it is C
Monday, March 23, 2015 at 6:18pm

Science
Which has a greater total resistance, a series circuit or a parallel circuit and why?
Monday, March 23, 2015 at 6:08pm

Science grade 8
Which chemical equation is balanced? 1. H20 H 2 + 20 2 2. 2H20 2H2 +0 2 3. 2H20 H2 + 20 2 4. H2O 2H2 + 20 2 Im super confused... But I think its 4?? Im probably wrong so please help?!?!
Monday, March 23, 2015 at 6:03pm

Earth science
What kind of front sometimes spawns tornadoes between an advancing cold and dry air mass and a warm moist air mass? 1) cold 3) stationary 2) warm 4) occluded
Monday, March 23, 2015 at 5:37pm

Science Check Please
1. Your ____ is your first line of defense against pathogens. 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. boil constrict cool down expand 3. The...
Monday, March 23, 2015 at 10:15am

science
based on the masses of CaCl2 and Na3PO4 you determined from the periodic table, what mass combining ratio would you predict?
Sunday, March 22, 2015 at 8:54pm

Science ( No Bad Post)
1. A muscle that does its job without your thinking about it is called a _______ muscle. An example is the _______. (1 point) cardiac; bicep skeletal; blood vessels smooth; bladder none of these 2. The body's muscles, bones, and joints work together like a ...
Sunday, March 22, 2015 at 8:43pm

Science Help
Which of the following carries blood to every part of the body? (1 point) blood vessels the heart lymph nodes the ventricles 7. Nutrients and oxygen diffuse into body cells from ______. (1 point) arteries the aorta capillaries veins 8. The leading cause of death in humans is ...
Sunday, March 22, 2015 at 7:29pm

Science Please
Which of the following carries blood to every part of the body? (1 point) blood vessels the heart lymph nodes the ventricles 7. Nutrients and oxygen diffuse into body cells from ______. (1 point) arteries the aorta capillaries veins 8. The leading cause of death in humans is ...
Sunday, March 22, 2015 at 6:59pm

Science Please
Which of the following carries blood to every part of the body? (1 point) blood vessels the heart lymph nodes the ventricles 7. Nutrients and oxygen diffuse into body cells from ______. (1 point) arteries the aorta capillaries veins 8. The leading cause of death in humans is ...
Sunday, March 22, 2015 at 6:51pm

Earth science
13 of the19 lives lost you to the Wichita Andover tornado were at the mobile home park in Andover. Even though there was some advanced warning what could explain the relatively high death toll at this location?
Sunday, March 22, 2015 at 5:06pm

Science
13 of the19 lives lost you to the Wichita Andover tornado were at the mobile home park in Andover. Even though there was some advanced warning what could explain the relatively high death toll at this location?
Sunday, March 22, 2015 at 2:43pm

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