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December 19, 2014

Homework Help: Science

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Recent Science Questions

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Science Please help
Some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. Is it likely that these rocks were present when Earth was first formed? No, this rock is probably just a sedimentary rock that was formed by much younger igneous rocks. Yes, the oldest ...
Tuesday, December 9, 2014 at 10:49am

Physical Science
What is the temperature of oxygen that boils at negative 183 Celsius?
Tuesday, December 9, 2014 at 3:13am

Science
How many families of elements are there Is there 9
Monday, December 8, 2014 at 9:01pm

Science
What is a species that competes with polar bears for resources?
Monday, December 8, 2014 at 7:40pm

science
a pipe that carries 10 gpm of liquid at 50 psi with at least 0.5 sq in area must fit through a hole thats 1.25 in in diameter.
Monday, December 8, 2014 at 7:21pm

Science
How many families of elements are there
Monday, December 8, 2014 at 6:19pm

Science
How to find valence electrons
Monday, December 8, 2014 at 6:14pm

Science
What are the names of the periods on a Periodic Table
Monday, December 8, 2014 at 5:59pm

science
Oxygen gas may be prepared by decomposing hydrogen peroxide, h2o2, using manganese (IV) oxide catalyst: 2H2O2(liquid) ----> 2H2O(liquid) + O2(gas) Calculate the amount of oxygen that will be produced from 1.35 moles of H2O2 Determine the mass of oxygen gas that can be ...
Monday, December 8, 2014 at 10:43am

Science
A geologist working in a national park finds a minerals. He is carrying a kit that contains a penny, a hand lens, a piece of tile, a geologic hammer, and a jackknife. Describe the geologist can use these items to determine some of the minerals characteristic.
Sunday, December 7, 2014 at 6:16pm

science
A 7E+3 kg object is 9.29 m away from a 4.7E+8 kg object. What is the gravitational force between the two objects?
Sunday, December 7, 2014 at 5:49pm

Science
A geologist working in a national park finds a mineral. He is carrying a kit that contains a penny, a hand lens, a piece of tile, a geologic hammer, and a jackknife. Describe how the geologist can use items to determine some of the mineral's characteristics? Help...
Sunday, December 7, 2014 at 5:17pm

science
Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s . tow seconds later a 20 g bullet is fired at 250 m/s into the rising baseball . How high will the combined bullet and baseball rise
Sunday, December 7, 2014 at 9:29am

Science
What will be the effect on litmus paper when methyl amine is used?
Sunday, December 7, 2014 at 9:12am

science
A 170g mass attached to a horizontal spring oscillates at a frequency of 3.10Hz . At t =0s, the mass is at x= 6.60cm and has vx = − 15.0cm/s. Determine the position at t= 5.00s. The period is 0.32258 s The angular frequency is 19.478 rad/s The amplitude is 6.6448×...
Saturday, December 6, 2014 at 7:36pm

Science
Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s . tow seconds later a 20 g bullet is fired at 250 m/s into the rising baseball . How high will the combined bullet and baseball rise.
Saturday, December 6, 2014 at 4:44pm

m
For a preschool plan can you have a science activity for each day?
Saturday, December 6, 2014 at 4:28pm

science
a 25 kg ball is trown into that air.when thrown it is going 10 m/s .calculate how high it travel
Saturday, December 6, 2014 at 10:26am

science
type of element of elements of neon
Saturday, December 6, 2014 at 9:19am

Science
A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 4.6 m waterfall. The spy’s speed is 16 m/s and the officials’ speed is ...
Saturday, December 6, 2014 at 1:26am

Science
Which of the following describes the fundamental difference between prokaryotic and eukaryotic cells?
Friday, December 5, 2014 at 11:02am

science
the constant value for speed of light is 3x10to the 7 m/sec. what is the mass equivalent of 100000 N-m of energy
Thursday, December 4, 2014 at 9:42pm

science Please Help
1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next??? A. its potential energy decreases. B. Its potential energy increases. C. Its potential energy stays the same. D. Its potential energy become the negative...
Thursday, December 4, 2014 at 5:56pm

science Please Help
During the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose molecules together. The breaking of the covalent bonds during digestion releases energy. the type of energy released is A.nuclear energy B.kinetic energy...
Thursday, December 4, 2014 at 5:39pm

Science
If the original pressure of a system is 700 torr, temp 30 C and volume 100L, what will the final volume be if the pressure is increased to 750 torr and temperature to 37C
Thursday, December 4, 2014 at 2:51pm

7th grade science
some animals, but not humans have an organ called a gizzard located near the top of their digestive tract. this organ is small and can contain small rocks. it also has thick muscular walls. based on this physical description which of the following is most likely to be the ...
Thursday, December 4, 2014 at 10:42am

Science
a ball with a mass of 1.50 kg traveling + 2.00 m/s collides with a stationary ball with a mass of 1.00 kg. After the collision, the velocity of the 1.50 kg ball is + 0.40 m/s. What is the velocity of the 1.00 kg ball after the collision?
Thursday, December 4, 2014 at 1:11am

Science
A mass of .1539 kg. moves down a 5 meter ramp in 2 seconds. What is the velocity and the KE developed by the moving mass?
Wednesday, December 3, 2014 at 8:43pm

science
which of the following features is most associated with the inner planets? A. rings made of ice and dust B lots of moons C large amounts of iron and silicon D thick atmospheres is it c or d?
Wednesday, December 3, 2014 at 7:34pm

Science
in what way are burning and the formation of rust alike?
Wednesday, December 3, 2014 at 7:14pm

science
which of the following features is associated with the inner planets? rings made of ice and dust lots of moons large amounts of iron and silicon thick atmospheres
Wednesday, December 3, 2014 at 6:55pm

Science
Which of the following is a quantitative property of minerals? A.Cleavage B.Hardness C.Luster D.Streak I'm thing Cleavage or Hardness but i'm not sure can someone help?
Wednesday, December 3, 2014 at 6:11pm

science
A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
Wednesday, December 3, 2014 at 5:52pm

Science
The Ka for the H2PO4–/HPO42– buffer is given by the equation: Ka= ([HPO4^-2]gamma [H^+])/[H2PO4^-]=10^-7.20 What is the pH of a 2:3 mixture of H2PO4– to HPO42– at 0.10 M ionic strength? (See the table for the activity coefficients.) I just am not sure how ...
Wednesday, December 3, 2014 at 4:19pm

Science
Polysaccharides break apart by the process of hydrolysis and need _________ for this process. Can you please help me fill in the blank.
Wednesday, December 3, 2014 at 4:05pm

Science
If a cheetah is able to accelerate at 15.0 m/s2 from a stand still, what speed will it reach after 2.50 seconds?
Wednesday, December 3, 2014 at 2:47pm

English
(1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade science, I have some experience with the faces and ...
Wednesday, December 3, 2014 at 1:12pm

science
Discuss the results of your research about the roles of nature versus nurture on human health. Share your opinion about how an individual’s genetic makeup interacts with nutrition, smoking, drug use, or exercise to affect the quality and length of life. Back up your ...
Wednesday, December 3, 2014 at 10:06am

Science
What is the total mass when you pour 100 g of vinegar into a flask and add 10 g of baking soda in a flask. Also what is the chemical formula for this. how can we change the formula so the experiment will be accurate. Thanks
Wednesday, December 3, 2014 at 9:56am

Science
How can I create a story of how my " constellation is formed? '' My teacher gave me this assignment. I have to create my own " Name" constellation, in this case its petasus because according to the chart I placed the dots down and it formed a hat. In ...
Tuesday, December 2, 2014 at 10:45pm

Science
Scorpius is one of the oldest constellations known - possibly even one of the original six signs of the zodiac. The constellation was once much larger, but the western portion representing the claws of the scorpion was given to Libra. Is this considered the constellation's...
Tuesday, December 2, 2014 at 8:26pm

Science Help!!!!
What form of pollution, if any, does energy source cause? My answer Air pollution?
Tuesday, December 2, 2014 at 8:25pm

science
how many seconds would it takes a boat to accelerate from 13m/s to 20m/s over a distance of 1.25 km ?
Tuesday, December 2, 2014 at 8:25pm

Science
make a paragraph about your favorite thing about winter? someone please help
Tuesday, December 2, 2014 at 7:29pm

Earth Science
Which of the following statements correctly describes the asthenosphere? 1- it is thin cold and rigid layer 2- it is the source of the earth's heat 3- it permits plate motion 4- it occurs only near subduction zones My answer is 1
Tuesday, December 2, 2014 at 7:02pm

science
Sarah wants to use a model to get an idea of how far away the stars are. She uses a marble to represent the Earth, and she places a basketball 1 m away to represent the Sun, which is the nearest star. If Sarah wishes to keep the distances between objects in her model at an ...
Tuesday, December 2, 2014 at 3:24pm

science
after a rock layer is eroded, whick additional event must occur to create and unconformity, or a gap , in the geologic record
Tuesday, December 2, 2014 at 3:22pm

Science one question!
Explain how gravitational, electrical and magnetic force act on a maglev train? I just need help on magnetic thanks!
Tuesday, December 2, 2014 at 1:36pm

history..maths litercy..geography..life science..isizulu..life orentation..
im doing grade 11 and next year im doing grade12 so my question is that i want to be a boilermaker and i want to work in sasol so i dont know if this sbject is right to do boilermaker if you have any information please contact me on 0736124260 or 0739615308 in june exam my ...
Tuesday, December 2, 2014 at 9:18am

Science Please Help
Which of the following is a testable hypothesis? A. Altered temperature may affect gas production, which measures fermentation rate. B. Does temperature affect fermentation? C. Temperature decreases will affect gas production and fermentation much of the time. D. If ...
Tuesday, December 2, 2014 at 8:18am

Science Please Help
Which of the following is a testable hypothesis? A. Altered temperature may affect gas production, which measures fermentation rate. B. Does temperature affect fermentation? C. Temperature decreases will affect gas production and fermentation much of the time. D. If ...
Tuesday, December 2, 2014 at 8:15am

language arts
When Louise Meyer was five years old, her mother took her to a science museum. That day, young Louise encountered her first snakes, and she's been fascinated with the reptiles ever since. Meyer now breeds snakes for educational programs. She takes her slinky friends to ...
Tuesday, December 2, 2014 at 12:23am

Science
Both a father and mother have dimples. Their son has dimples, but their daughter does not. Which genes, DD, Dd, or dd, does each family member have? Father and Mother= DD Son= Dd Daughter=dd
Monday, December 1, 2014 at 11:23pm

Language Arts
When Louis Meyer was five years old, her mother took her to a science museum. That day, young Louis encountered her first snakes, and she's be fascinated with the reptiles ever since. Meyer now breeds snakes for educational programs. She takes her slinky friends to schools...
Monday, December 1, 2014 at 8:51pm

Language Arts
When Louis Meyer was five years old, her mother took her to a science museum. That day, young Louis encountered her first snakes, and she's be fascinated with the reptiles ever since. Meyer now breeds snakes for educational programs. She takes her slinky friends to schools...
Monday, December 1, 2014 at 8:37pm

science
What is the difference between sexual reproduction and asexual reproduction?
Monday, December 1, 2014 at 7:17pm

Science.. Need help ASAP!
How is an area's topography determined? a.By using an area's longitude and latitude b.By using an area's scale c.By using an area's elevation, relief, and landforms * d.By using an area's elevation, longitude, latitude How are lakes and ponds similar? a. ...
Monday, December 1, 2014 at 6:56pm

Science
Suppose that you heated a sample of a hydrated ionic compound in a test tube. What might you expect to see inside the test tube, near the top of the test tube? Explain please i really am stumped on this question...
Monday, December 1, 2014 at 6:38pm

Science.. Need help ASAP!
How is an area's topography determined? a.By using an area's longitude and latitude b.By using an area's scale c.By using an area's elevation, relief, and landforms d.By using an area's elevation, longitude, latitude How are lakes and ponds similar? a. ...
Monday, December 1, 2014 at 6:30pm

Science.. Need help ASAP!
How is an area's topography determined? 1.By using an area's longitude and latitude 2.By using an area's scale 3.By using an area's elevation, relief, and landforms 4.By using an area's elevation, longitude, latitude How are lakes and ponds similar? 1. ...
Monday, December 1, 2014 at 5:50pm

Science IPS
A mass of 10 g of sodium nitrate is dissolved in 10cm3 of water at 80 degrees (c). As the solution is cooled, at what temperature will a precipitate first appear?
Monday, December 1, 2014 at 5:22pm

science
A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
Monday, December 1, 2014 at 5:03pm

science
can we predict when a hurricane will occur? explain. I have tried so man website and still no answer.. please help
Monday, December 1, 2014 at 4:08pm

science
when do huricanes happen??
Monday, December 1, 2014 at 3:50pm

Science
~~~~~~~~~~~~~~~~~~~~~~~~~Choices *Extra Words In The Word Box (Will Be Leftovers)* -Landfills -Limiting Factor -Non~point Source -Habitat Destruction -Stop -Migration -Biodiversity -Carbon Dioxide -Reverse -Carrying Capacity -Commensalism -Selective Cutting -Extinction -...
Monday, December 1, 2014 at 2:58pm

Science
~~~~~~~~~~~~~~~~~~~~~~~~~Choices *Extra Words In The Word Box (Will Be Leftovers)* -Landfills -Limiting Factor -Non~point Source -Habitat Destruction -Stop -Migration -Biodiversity -Carbon Dioxide -Reverse -Carrying Capacity -Commensalism -Selective Cutting -Extinction -...
Monday, December 1, 2014 at 2:58pm

science
Wood fragments from the floor of a palace in Syria - Syro-Hittite period. Date: 675 ± 50 years BCE?
Monday, December 1, 2014 at 9:33am

science
An electron of mass 9.11 × 10-31 kg and charge 1.6 × 10-19 C passes through a cathode ray tube with a velocity of 3.7 × 107 m/s. It enters a magnetic field of flux density 0.47 mT at a right angle. What is the radius of curvature of the path in the magnetic ...
Monday, December 1, 2014 at 4:52am

check my science hw please.
31. Which of the following is an example of a global environmental choice? A. a student deciding to ride a bicycle to school B. a family deciding to recycle their newspapers C. a town meeting about a new nature refuge. D. nations meeting to discuss the ozone layer. I got C as ...
Sunday, November 30, 2014 at 11:12pm

check my science hw please.
30. Laws can help endangered species by prohibiting A. Captive breeding B.habitat preservation C diversity of genes D. products made from the species I got D, I have a feeling that this may be wrong.
Sunday, November 30, 2014 at 11:08pm

check my science hw please.
26. In the last few centuries, the number of species becoming extinct on Earth has A.decreased dramatically B. decreased slightly. C. increased slightly. D.increased dramatically I think it should be C.
Sunday, November 30, 2014 at 11:04pm

check my science hw please.
25. All of the following factors affect an area's biodiversity EXCEPT A. areas B.number of endangered species C. climate D. diversity of niches. I got C for my answer.
Sunday, November 30, 2014 at 10:55pm

check my science hw please.
24. can provide an economic benefit to A. drug companies B. tourists C.hikers D.endangered species I got A for my answer.
Sunday, November 30, 2014 at 10:48pm

check my science hw please.
18. Which of the following would be a cost of drilling for oil in Antarctica? A. The supply of heating fuel would be increased. B.There would be a greater opportunity to study wildlife there. C. An oil spill could harm food sources for penguins. D. Many new jobs would be ...
Sunday, November 30, 2014 at 10:46pm

science
10. One group of gases that is responsible for destroying ozone in the ozone layer is A.car exhaust fumes B.CFCs C.nitrogen oxides and sulfur oxides D. Carbon monoxide and carbon dioxide I got B for my answer.
Sunday, November 30, 2014 at 10:41pm

Physical Science
Complete and balance the equation for the following single-replacement reactions. (Use the lowest possible coefficients. Omit states-of-matter from your answer.) Ni + Cu(NO3)2(aq)-->
Sunday, November 30, 2014 at 10:12pm

science
A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
Sunday, November 30, 2014 at 6:01pm

Religion/ Social Studies/ Science
Please, someone tell me who was it that made the world. Thank you.
Sunday, November 30, 2014 at 6:00pm

science
what is pollution
Sunday, November 30, 2014 at 3:36pm

Science
A 40.0 g block of ice at -15 degrees C is dropped into a calorimeter (of negligible heat capacity) containing water at 15 degrees C. When equilibrium is reached, the final temperature is 8.0 degrees C. How much water did the calorimeter contain initially? Specific heat of ice ...
Saturday, November 29, 2014 at 10:25pm

Science
The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 94 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 60 m/s in 8.2 s? Answer in units of kN
Saturday, November 29, 2014 at 5:30pm

science
a rectangle steel block of dimension 10m multiple by 3m multiple by 2m, has mass 45kg calulate the density of the block.
Saturday, November 29, 2014 at 3:28pm

Science
For my science (biology) coursework i am doing an experiment involving photosynthesis- the cabomba experiment. I need to know 1- the variables that are controlled and why 2- what equipment is used and why PLEASE HELP... THANK YOU
Saturday, November 29, 2014 at 1:55pm

English
1. I have to do scince and math homework tonight. 2. I have to do my science and math homework. ------------ Are both grammatical? Which one is commonly used? Do you have other way of expressing?
Saturday, November 29, 2014 at 1:49am

science
an object has an electric charge of +12. it loses 10 electrons. what is the new electric charge on the object?
Friday, November 28, 2014 at 8:42am

SCIENCE
We did a radioactive decay and half life lab with m&ms and I do not understand these conclusion questions: 1. how many half lives would it take for 500 nuclei to decay to 6.25% of the original number of nuclei? My ans: 3125?- do not think that's right! 2. Is there any way ...
Thursday, November 27, 2014 at 10:15pm

Science
What volume of 0.050M sodium hydroxide is needed to react with 25cm3 of 0.068M ethanoic acid?
Wednesday, November 26, 2014 at 2:21pm

environmental Science
the entire area of land that a river drains is called
Wednesday, November 26, 2014 at 12:16pm

Environmental Science
what did Thomas Malthus believe
Wednesday, November 26, 2014 at 12:12pm

Science Help Please
Which of the following is not among the advantagees of generrating nuclear energy? A.it does not release carbon dioxide into the atmosphere B. it does not require a specialized process or involve any risk C. it does not release chemicals that cause acid rain D. it releases ...
Tuesday, November 25, 2014 at 10:52pm

science
explain how mutations in dna affect the traits of an individual
Tuesday, November 25, 2014 at 9:23pm

SCIENCE BUT I REALLY NEED HELP
genes are specific sections of ___ To pass its traits on to the next generation, organisms must ____
Tuesday, November 25, 2014 at 7:44pm

Science
This will help explain another question I have. So,what is the pattern that occurs when magnetic waves are spread out through the visible spectrum?
Tuesday, November 25, 2014 at 7:17pm

Science 1 easy question!!!!
If new information about the behavior of atoms is discovered and verified, then revisions will need to be made to the current___ My answer: Atomic model?
Tuesday, November 25, 2014 at 4:46pm

Science 1 easy question!!!!
One way the modern atomic model differs from Thomsons atomic model is that electrons are no longer scattered throughout an atoms positive matter like chocolate chips in cookie dough, instead each electron is outside of the nucleus occupying a specific ______. My answer: Orbital?
Tuesday, November 25, 2014 at 4:41pm

Science 1 easy question!!!!
Is K^+1 and F^-1 an ionic bond? My answer: yes
Tuesday, November 25, 2014 at 4:29pm

Science!
An index fossil must be? a) older than 1 billion years. b) smaller than other fossils around it. c)larger than other fossils around it. D) unique in its appearance. pleases help someone i don't really know but my best guess is a)
Tuesday, November 25, 2014 at 10:38am

science
what cause sea floor spreading
Monday, November 24, 2014 at 10:10pm

Science
2 ml of stock antibiotic (64 mg/ml) was diluted into a test tube containing 2 ml of broth (final volume is 4). A series of 2-fold SERIAL DILUTIONS were performed by transferring 2 ml to three other tubes, consecutively (final volumes now 2 ml in each tube). The final ...
Monday, November 24, 2014 at 9:27pm

science
how many moles of oxygen gas are necessary to form 0.737 moles of carbon dioxide
Monday, November 24, 2014 at 5:56pm

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