Saturday
December 20, 2014

Homework Help: Science

Branches of Science

Recent Science Questions

Post a New Question | Current Questions

physical science
Suppose you are camping in the mountains and you need to melt 1.8 kg of snow at 0.0 degC to 70.0 degC. The specific heat of water is 4186 j/kg*C while the latent heat of fusion for water equals 3.34 x 10^5 J/kg. How much heat will be needed? Express in KJ.
Tuesday, March 18, 2014 at 10:30pm

science help
why are acids and bases good conductors of electricity?
Tuesday, March 18, 2014 at 10:25pm

science help
Renewable resources are resources that are available again and non-renewable are ones that can't be replaced.How do these effect biodiversity? If a non-renewal can't be replaced, I can understand that once it's gone, it's not avaialable, but what about the ...
Tuesday, March 18, 2014 at 10:01pm

science help
If water temperature changes in favor of greater oxygen levels how do the population of the fish and wading bird population change in response to the new oxygen over time? I would think the fish population would increase and so would the birds (because the fish increase) but I...
Tuesday, March 18, 2014 at 9:56pm

Science
What type of a bond is a metal cation likely to form?
Tuesday, March 18, 2014 at 8:58pm

Science
How did the discovery of neutrons change the atomic model?
Tuesday, March 18, 2014 at 8:56pm

science
What describes the charecteristics of a liquid? A.) It has a fixed volume and shape. B.) It has high energy and expands to fill the container. C.) It has fixed volume and varied shape. D.) It has no fixed volume or shape.
Tuesday, March 18, 2014 at 8:31pm

Science
1. Where is the Earth's equator located today? Describe the climatic conditions. 2. Compare and contrast the climatic conditions existed during this time today. 3. Answer: What types of fossils would you expect to find here? Explain why based on the animals' ...
Tuesday, March 18, 2014 at 8:13pm

Science
For carbon to move from an animal to a car, what processes need to happen? Photosynthesis, combustion, and respiration? Respiration, fossilization, and photosynthesis? Fossilization, decomposition, and respiration? Or respiration, photosynthesis, and decomposition?
Tuesday, March 18, 2014 at 6:31pm

Science
For carbon to move from an animal to a car, what processes need to happen? Photosynthesis, combustion, and respiration? Respiration, fossilization, and photosynthesis? Fossilization, decomposition, and respiration? Or respiration, photosynthesis, and decomposition?
Tuesday, March 18, 2014 at 5:28pm

Science/Chemistry
Is this equation balanced? Does it show that no atoms are lost or gained in chemical reactions? 8Fe + S8 --->8FeS
Tuesday, March 18, 2014 at 4:53pm

Science
Which of the following is a mechanism used by humans to defend against any disease-causing organism 1)the creation of antibodies 2)the injection of vaccines 3)the production of mucus membranes 4)the use of antibiotics
Tuesday, March 18, 2014 at 3:00pm

science
Please help balance this: CH3COO + CrO4 + H = Cr(OH)3 + CO2 + H2O
Tuesday, March 18, 2014 at 2:39pm

Science
Artificial Selection leads to loss of Genetic Variation? or Genetic Equilibrium?
Tuesday, March 18, 2014 at 2:16pm

science
Three point charges are placed on the x-axis. A charge of +2.0 μC is placed at the origin, -2.0 μC to the right at x = 50 cm, and +4.0 μC at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin? ...
Tuesday, March 18, 2014 at 1:46pm

science quiz pls help!!!
In the following diagram, the green 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*** 3. Which of...
Tuesday, March 18, 2014 at 12:30pm

Science
Some water molecules are split into hydrogen and oxygen when going from: A. Atmosphere to clouds B. Ocean to atmosphere C. Ground water to surface water D. Surface water to biosphere EXPLAIN!
Tuesday, March 18, 2014 at 11:01am

science
30 cubic meters of argon gas are kept under constant pressure. The gas is heated from 10.0 degrees Celsius to 293 degrees Celsius. What is the new volume of the gas?
Tuesday, March 18, 2014 at 10:44am

Science
how did the discovery of nutrons change the atomic model
Tuesday, March 18, 2014 at 9:46am

Science
what type of bond is a metal cation likely to form?
Tuesday, March 18, 2014 at 9:42am

science
Describe an experiment you might perform to determine which leg muscles of a frog are important for jumping long distances.
Tuesday, March 18, 2014 at 4:05am

Science
1. In the following diagram, the green 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 17, 2014 at 11:56pm

Science -Check Answers-
1. In the following diagram, the green 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 17, 2014 at 10:38pm

Science asap
Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers Which step in the nitrogen cycle is accelerated at the beginning of the eutrophication ...
Monday, March 17, 2014 at 10:31pm

human resources
ABC science, concerned about higher and higher health care costs has decided to implement the following changes in their employment relationships with ABC employees: 1. Employees must stop using tobacco products and the company will immediately prohibit on site use of tobacco ...
Monday, March 17, 2014 at 10:21pm

Science
There is a theoretical protein called largeX that helps to stimulate growth of the body during adolescence. The promoter on the lrgX gene that codes for it is normally able to have a protein bind to it that promotes transcription called largene. Largene, bound to the promoter...
Monday, March 17, 2014 at 9:06pm

6th grade - Lang Arts
Can you check the following? Find the verb phrase 1. Will you buy me a drink? ans: will buy 2. Sam is not going to the dance. ans: is going 3. Al should have mowed the lawn today. ans: should have mowed 4. Theresa will be playing her clarinet at the concert tonight. ans: will ...
Monday, March 17, 2014 at 8:55pm

Science
Which of the following happens when a low-mass star runs out of fuel? Choose all that apply. A. Its core becomes a white dwarf B. Its outer layers form a nebula, or vast cloud of gas and dust C. its outer layers expand, and the star becomes a red giant D. gas and dust in a ...
Monday, March 17, 2014 at 8:40pm

Physical Science 9
what type of bond is a metal cation likely to form?
Monday, March 17, 2014 at 8:29pm

Physical Science 9
how did chadwicks discovery of nutrons change the atomic model
Monday, March 17, 2014 at 8:16pm

Physical Science 9
In an ionoic bond how many valence electrons would an atom have?
Monday, March 17, 2014 at 8:03pm

Science
A factory worker pushes a 29.2kg crate a distance of 4.1m along a level floor at constant velocity by pushing downward at an angle of 28* below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25.
Monday, March 17, 2014 at 7:02pm

physical science
Green light has a frequency of about 5.3Hz~10Green light has a frequency of about 5.3Hz~ 10^{14}. Using the relationship speed of light (c)=fƒÉ find its wavelength in air.
Monday, March 17, 2014 at 4:17pm

Physical Science
The entropy of an isolated system always do what when natural processes occur?
Monday, March 17, 2014 at 12:34pm

Physical Science
The second law of thermodynamics forbids a heat engine to have thermal efficiency of what?
Monday, March 17, 2014 at 12:34pm

Physical Science
A sample of gas has its number of molecules halved, its Kelvin temperature doubled, and its volume halved. What is the new pressure, relative to the original pressure?
Monday, March 17, 2014 at 12:33pm

Physical Science
On a winter day the temperature drops from –5°C to –15°C overnight. If a pan sitting outside contains 0.49 kg of ice, how much heat is removed from the ice for this temperature change?
Monday, March 17, 2014 at 12:32pm

Physical Science
An ice tray with 175 g of water at 30°C is placed in a freezer at –9°C. How much energy must be removed from the water to lower its temperature to the freezing point?
Monday, March 17, 2014 at 12:32pm

Physical Science
If the volume and the number of molecules remain constant for a gas, a temperature increase causes the pressure to do what?
Monday, March 17, 2014 at 12:31pm

Physical Science
When 8 kcal of heat is added to 2.4 kg of a substance, its temperature increases 23 C°. What is the specific heat of the substance?
Monday, March 17, 2014 at 12:30pm

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 ...
Sunday, March 16, 2014 at 11:25pm

science
how do you explain the millions of different substances found on earth
Sunday, March 16, 2014 at 8:24pm

Physical Science 9
when an electric current is passed through water 2 gasses are formed is this a chemical or physical change
Sunday, March 16, 2014 at 3:44pm

Physical Science 9
How would you separate a mixture of iron fillings , salt, sand, and wood chips
Sunday, March 16, 2014 at 3:06pm

Physical Science 9
when exposed to the same amount of heat for the same amount of time, a 3 g sample of copper will experience a greater temperature change then a 12 g sample of copper due to its smaller what?
Sunday, March 16, 2014 at 2:45pm

Physical Science 9
a substance made of two or more elements chemically combined in a set ratio or proportion is called what
Sunday, March 16, 2014 at 2:41pm

Physical Science 9
the contents of a can of air freshener are gaseous when sprayed but remain a liquid in the can due to what?
Sunday, March 16, 2014 at 2:32pm

Science
a substance made of two or more elements chemically combined in a set ratio or proportion is called what
Sunday, March 16, 2014 at 1:14pm

Science
when molecules of water vapor in the air come into contact with a cold can of soda they lose energy slow down and form a liquid due to a decrease in what?
Sunday, March 16, 2014 at 1:07pm

Science
do pure substances have different chemical and physical properties?
Sunday, March 16, 2014 at 12:35pm

science
Calculate the amplitude of a wave
Sunday, March 16, 2014 at 12:29pm

Science
Particles have enough energy to break free from each other and can move around freely; particles spread out in different directions solid liquid gas molecule my answer is molecule
Sunday, March 16, 2014 at 12:07pm

science
350g ofwater at 30 degree celcius is contained in a copper vessel of mass 50g. Calculate the mass of ice required to bring down the temperature of the vessel and its content at 5 degree celcius.
Sunday, March 16, 2014 at 8:02am

Science
Determine the pkb of methylamine if the kb is 4.4*10^-4.
Sunday, March 16, 2014 at 6:02am

English
We are not as close as we once were, at least not since the thing happened. We were sitting in science class when I decided to look at her notebook. I noticed that she wasn't taking notes. I think this would be first person
Saturday, March 15, 2014 at 7:11pm

Science
How does adaptation explain the patterns of distribution of plant and animal species in the world? My answer is: If you were in the rain forest, the plants on the forest floor will die because there's tall trees blocking the sunlight. The trees adapt and grow larger.
Saturday, March 15, 2014 at 6:34pm

Science
Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers Would the correct answer be A?
Saturday, March 15, 2014 at 5:50pm

Science- Last question
Which of the following is true of carbon? Carbon is present in all organisms and in the atmosphere.* Carbon moves from consumers to producers. Carbon must be fixed by bacteria before other organisms can use it. Carbon can only be released from dead organisms by decomposers.
Saturday, March 15, 2014 at 5:26pm

Science
How does matter move through the biosphere?
Saturday, March 15, 2014 at 5:20pm

Science
Studies indicate that fertilizers from nearby farm fields have entered a lake. Which of the following describes a likely change in this ecosystem in the future? A.Algae populations will increase and trout populations will decrease.* B.Algae populations will decrease,and trout ...
Saturday, March 15, 2014 at 2:56pm

Science
Which of the following is true of carbon? Carbon is present in all organisms and in the atmosphere.* Carbon moves from consumers to producers. Carbon must be fixed by bacteria before other organisms can use it. Carbon can only be released from dead organisms by decomposers.
Saturday, March 15, 2014 at 2:27pm

Science
Roseate spoonbills are wading birds that live in the Everglades of Florida. These birds eat a diet of shrimp, fish, amphibians, and aquatic plants. Which of the following sets of words could be used to classify this species? autotroph, omnivore, predator heterotroph, herbivore...
Saturday, March 15, 2014 at 2:04pm

Science
Cave ecosystems are characterized by extremely low light levels. What role does photosynthesis play in a cave ecosystem? 1: Photosynthesis is essential because it provides the original energy source for all food chains in this ecosystem. 2: photosynthesis is essential only for...
Saturday, March 15, 2014 at 12:58pm

physical science
a particle moves from rest and accelerated at 5.00m/s2. how long does it take to travel m?
Saturday, March 15, 2014 at 7:29am

science
1 A ……... is a rectangular array of numbers that are enclosed within a bracket . horizontal set vertical matrix 2 When the numbers of rows is equal to the numbers of columns equal to 'n'. Where m=n. Then is called….. a square matrix a column a row a ...
Saturday, March 15, 2014 at 6:21am

science
1 What is a set of real or complex numbers or elements arranged in rows or columns to form a rectangular array. set matrix determinant real numbers 2 If A.x= λx ,where A= ∣∣∣∣211232−​;212∣∣∣∣ ,determine the eigen ...
Saturday, March 15, 2014 at 6:16am

Science
Kudzu is a climbing vine native to Japan and China. It was introduced in the U.S. in the late 1800s. Today, this plant is common along roadsides in the Southeast, where it takes over and destroys native vegetation. Kudzu would be classified as a(n) ____________ species. My ...
Saturday, March 15, 2014 at 2:23am

Science
1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding* 2. Which piece of children’s’ ...
Friday, March 14, 2014 at 10:35pm

Science (Chemistry)
. Complete all the following for the reaction (NH4)2S + Cd(NO3)2 --> CdS(s) + NH4NO3 1. Balance this equation 2. Write the ionic equation 3. Write the net ionic equation
Friday, March 14, 2014 at 10:00pm

Science
____ bacteria carry out the conversion of gaseous nitrogen to a biologically useful form of nitrogen. My answer is "nitrogen-fixing" (This is fill in the blank)
Friday, March 14, 2014 at 8:31pm

THIS IS FOR MATH AND SCIENCE TUTORS
HAPPY PI DAY! A mathematician, a physicist, and an engineer are all given identicalrubber balls and told to find the volume. They are given anything theywant to measure it, and have all the time they need. The mathematician pulls out a measuring tape and records the ...
Friday, March 14, 2014 at 7:34pm

Science on dissolving
Some medicines are more effective if they dissolve slowly. How could you design a pill that would take longer to dissolve?
Friday, March 14, 2014 at 5:05pm

science
How can two parents with only one round allele between them (1 out of 4 alleles) produce an F1 generation in which 50% of individuals have round seeds? What appears to be the inheritance pattern for seed shape?
Friday, March 14, 2014 at 11:07am

science
If Mendel had only looked at a single cross that produced 10 offspring to determine the pattern of inheritance of seed shape in pea plants, what might he have inferred?
Friday, March 14, 2014 at 11:06am

science
What happened to the proportions of the two phenotypes as the F1 generation grew from 10 to 100 offspring? Why?
Friday, March 14, 2014 at 11:06am

science
Is this hypothesis in the right format?. When yeast and vinegar are put together, they will form an endothermic reaction.
Thursday, March 13, 2014 at 11:56pm

Earth science
The greenhouse effect is a result of A. consumption of fruits and vegetables that produce a biofuel. B. absorption and radiation of energy in the hydrosphere. C. absorption and radiation of energy in the atmosphere. D. consumption and radiation of energy in the atmosphere. D?
Thursday, March 13, 2014 at 11:29pm

Earth science
1. Which of the following is not a natural cause of climatic change? A. Earth's tilt B. Solar activity C. Human activity D. Volcanic activity I think it is C
Thursday, March 13, 2014 at 11:27pm

science
One property used to broadly classify elements is malleability. If a substance is malleable, it can be hammered, shaped, and flattened without shattering. Which group of elements has this property? A. Metals B. Metalloids C. Nonmetals D. Noble gases
Thursday, March 13, 2014 at 8:51pm

Science
How many moles of O2 are needed to react with 1.5 moles of SO2?
Thursday, March 13, 2014 at 7:55pm

Science
How many moles of O2 are needed to make 1.98 moles of SO3?
Thursday, March 13, 2014 at 7:55pm

science
how many moles of SO2 are needed to make 3 moles of SO3?
Thursday, March 13, 2014 at 7:54pm

Science
how many moles of SO3 are produced from 3 moles of O2?
Thursday, March 13, 2014 at 7:51pm

science pls help
i posted this earlier but got a confusing answer so pls help as best as u can asap! True or False 1. If a 40 kg person is accelerating at 10 m/s2, then the magnitude of the force acting on him or her is 400 N. (1 point) true false Multiple Choice 2. How much force is needed to...
Thursday, March 13, 2014 at 5:21pm

Language arts: check my answers
For questions 7–15, rewrite each sentence, adding commas where needed. (7) While I was researching skateboards I found an interesting old newspaper story. (8) In the June 29 1999 edition of the Mercury there was an article on skateboarding. (9) Some scientists in San ...
Thursday, March 13, 2014 at 5:13pm

science URGENT so need help
PLS HELP ASAP True or False 1. If a 40 kg person is accelerating at 10 m/s2, then the magnitude of the force acting on him or her is 400 N. (1 point) true false Multiple Choice 2. How much force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s2? (1 point) 62 N ...
Thursday, March 13, 2014 at 4:45pm

Science check my answers
Which step in the nitrogen cycle is accelerated at the beginning of the eutrophication process? denitrification*** nitrogen fixation producer uptake of nitrogen consumer decomposition Which of the following is carried out by denitrifying bacteria? break down large, nitrogen-...
Thursday, March 13, 2014 at 4:38pm

math
Joe puts 5 books in his backpack as he leaves for school. He has 2 math books, 1 science book, and 2 history books. What is the probability that he will grab his science book out of his backpack without looking? I think 1/5 Jacquie has 4 sweaters that go with her new jeans. ...
Thursday, March 13, 2014 at 4:29pm

Science: my answers
Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers***
Thursday, March 13, 2014 at 4:14pm

MATH
Joe puts 5 books in his backpack as he leaves for school. He has 2 math books, 1 science book, and 2 history books. What is the probability that he will grab his science book out of his backpack without looking? I think 1/5 Jacquie has 4 sweaters that go with her new jeans. ...
Thursday, March 13, 2014 at 4:09pm

Science
Which best describes the similarities among elements included in the same column of the periodic table? A. They have the same state at room temperature. B. They have the same number of protons. C. They have the same number of electrons. D. They have similar chemical properties.
Thursday, March 13, 2014 at 4:02pm

Science
Which of the following statements about continental glacial movement is correct? A. continental glaciers can only flow uphill b. continental glaciers can flow in all directions c. continental glaciers can only flow downhill d. continental glaciers do not flow at all. *** A ...
Thursday, March 13, 2014 at 3:27pm

Science
What is the composition of the A horizon ? a. topsoil b. subsoil c. bedrock d. water Either b or d? ^^
Thursday, March 13, 2014 at 3:19pm

Science
Which of the following statements about continental glacial movement is correct? A. continental glaciers can only flow uphill b. continental glaciers can flow in all directions c. continental glaciers can only flow downhill d. continental glaciers do not flow at all. *** A ...
Thursday, March 13, 2014 at 3:15pm

Science
Which of the following is not an example of work? A. raising a barbell over your head B. picking up a box off the floor C. holding a tray in the cafeteria line D. pushing a box across the floor I think its C.
Thursday, March 13, 2014 at 3:12pm

Science
In what direction does an applied force move an object? It moves opposite right?
Thursday, March 13, 2014 at 3:10pm

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

Pages: <<Prev | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | Next>>

Post a New Question | Current Questions

Search
Members