Homework Help: Science

Branches of Science

Recent Homework Questions About Science

science
What is heat energy? Where does it come from, and what are its properties? Include in your discussion the following terms: molecules, conduction, convection, and radiation.
Thursday, May 2, 2013 at 11:25pm

Science
Identify six renewable (as opposed to depleted) sources of energy.
Thursday, May 2, 2013 at 10:48pm

Physical Science
10. The more compact a metal is, the less brittle it becomes. -True? I'm confused about this one because of what the textbook says: "the more compact the atoms become, the harder the metal becomes. While the compactness makes the metal hard, a fracture on any boundary...
Thursday, May 2, 2013 at 8:24pm

Science
If the current in a wire is at 0.5 A and the voltage is measured 100 volts, what is the resistance in the wire?
Thursday, May 2, 2013 at 6:38pm

Science
Does the energy move from Earth’s surface and atmosphere out to space through radiation, conduction, or convection? Explain.
Thursday, May 2, 2013 at 3:32pm

Science help.
You make a terrarium for your school’s science fair by putting some soil into a glass container and adding small plants. You moisten the soil with water and add a slug. You cover the terrarium with clear plastic that has vent holes. Then, you place the terrarium in a ...
Thursday, May 2, 2013 at 3:09pm

science
A linear circuit is shown below in Figure 1. Figure 1 The elements in this circuit have the following values: R1=100Ω, R2=200Ω, R3=350Ω, V=5V, and I=0.004A. Determine the potentials drops vA and vB across resistors R1 and R2 respectively. What is the value of ...
Thursday, May 2, 2013 at 9:20am

Physical Science
6. In order to turn 2 iron atoms into rust, 2 water molecules must be present. -False?
Thursday, May 2, 2013 at 7:07am

science
the ratio of the inlet pistol force and outlet pistol force is 2:7.calculate the diameter of the inlet pistol if the radius of pistol one is 15cm
Thursday, May 2, 2013 at 3:36am

Science
What concentration of CH3NH3Br is necessary to prepare a pH = 10.00 buffer solution assuming the base concentration is 0.49 M (Kb for CH3NH2 = 4.4 x 10-4).
Wednesday, May 1, 2013 at 9:59pm

physical science
A nail is driven into a board to a depth of 1.00 cm with one strike from the hammer. The hammer striking the nail hit it with a force of 200.00 Newtons. How much work was done?
Wednesday, May 1, 2013 at 6:29pm

7th grade Science
1. Which of these sources of energy is NOT renewable? (1 point) wind solar power hydroelectric power natural gas 2. Air can be polluted by ____. (1 point) tiny particles of soot carbon monoxide sulfuric acid all of the above 3. Which of the following can cause acid ...
Wednesday, May 1, 2013 at 4:46pm

Science
How could an architect estimate the weight of a brick wall if each brick weighs three pounds?
Wednesday, May 1, 2013 at 4:16pm

science
A boy is riding a skateboard. Why does the skateboard have the ability to do work? A. because it can slow down B. because it can change direction C. because the force applied by the rider acts in the same direction as the motion of the skateboard D. because the force applied ...
Wednesday, May 1, 2013 at 2:19pm

Science
1.Why do you think an FRH doesn’t come with water already in it? 2.Do you think there are small pieces or large pieces of magnesium metal in an FRH? Explain. 3. Why is it important that the reaction in an FRH be fast?
Wednesday, May 1, 2013 at 8:56am

agricultural science
Outline and explain the objectives fencing a farm land
Wednesday, May 1, 2013 at 2:55am

science
why is a blue star cuz of temperatuure or location
Wednesday, May 1, 2013 at 12:26am

science
a propane gas reacts with oxygen to produce carbon dioaxide and water is this heat energy or nucler energy
Wednesday, May 1, 2013 at 12:21am

science
Does the moon reflect or absorb sunlight?
Wednesday, May 1, 2013 at 12:20am

science
a student went downhill from a flatsurface on a skateboard is this increase in friction or increse in velocity
Wednesday, May 1, 2013 at 12:18am

science
A boy is riding a skateboard. Why does the skateboard have the ability to do work? Answer A. because it can slow down B. because it can change direction C. because the force applied by the rider acts in the same direction as the motion of the skateboard D. because the force ...
Tuesday, April 30, 2013 at 11:27pm

science
A group of wind turbines operates in an open field. Which statement about the wind turbines is true? Answer A. The wind turbines produce movement of air that does work. B. The wind turbines do work by using electricity to produce power. C. The wind turbines cannot do work ...
Tuesday, April 30, 2013 at 11:11pm

Science
gravitational forces are be acted on a space center what other data need to show the forces a-direction of the opposite force b-magnitute of the downward force graviatational forrces are being acted on a space station i think what other of the two data are needed to fully show...
Tuesday, April 30, 2013 at 10:58pm

science
gravitational forces are be acted on a space center what other data need to show the forces a-direction of the opposite force b-magnitute of the downward force rigth answer: b
Tuesday, April 30, 2013 at 9:02pm

science
what 2 forces act on a person jumping on a trampoline a-lift and tension b-tension and gravity c-friction and drag d-compression and friction right answr b
Tuesday, April 30, 2013 at 8:57pm

science
why could dna be classified as a polymer A-has a chemical structure similar to salt crystals b-made of repeating pattern of smaller molecules c-a solid found in all living matter right answer b
Tuesday, April 30, 2013 at 8:51pm

science
Which ore could produce a metal you would like to wear? Why?
Tuesday, April 30, 2013 at 6:55pm

Agricultural science
What type of fences can be used?. Draw aa diagram to show the arrangement of poles at coner or where a fence change diirection?.state and explain what records should be kepT for the efficent management of a dairy herd?.
Tuesday, April 30, 2013 at 3:05pm

Agricultural science
Outline and explain the objectives of fencing a farmland
Tuesday, April 30, 2013 at 2:52pm

MATHS
Mrs.Koh purchased new books for the school library, of which 6 were Mathematics books, 7 were Science books, 10 were Music books, 3 were Art books, and 4 were social studies books. All of these books were different. She picked a book from each subject to display in a row on a ...
Tuesday, April 30, 2013 at 6:26am

science
Why do plants without vascular systems tend to grow small and close to the ground? A. Nonvascular plants get less food than vascular plants. B. Nonvascular plants lack structures that allow the plant to grow large. C. Nonvascular plants grow close to the ground because they ...
Monday, April 29, 2013 at 10:41pm

science
HOw would you attempt to isolate and identify a bacterial infection acquired on another planet
Monday, April 29, 2013 at 10:30pm

Biology
Is 9th grade biology hard? Is it interesting...?? I love life science but I just wondering if 9th grade biology hard??? I'm taking biology next year.
Monday, April 29, 2013 at 7:48pm

Science 8R - help!
What is consumers???
Monday, April 29, 2013 at 7:40pm

science
Al(s) + HCl(aq) AlCl3(aq) + H2(g) Zn(s) + HCl(aq) ZnCl2(aq) + H2(g) Consider the unbalanced equations above. A 0.250 g sample of a mixture of aluminum and zinc metal is reacted with an excess of hydrochloric acid. Both metals react with hydrochloric acid. The sample produces ...
Monday, April 29, 2013 at 5:20pm

physical science
If a sample emits 1000 counts per second when the detector is 1 meter from the sample, how many counts per second would be observed when the detector is 2 meters from the sample?
Monday, April 29, 2013 at 4:35pm

science
what may happen to an ecosystem if nonliving factors change or if one more populations are removed from or added to the ecosystem?
Monday, April 29, 2013 at 3:14pm

science
which cause more severe illnesses? bacteria or viruses?
Monday, April 29, 2013 at 1:00pm

physical science
define earth station
Monday, April 29, 2013 at 11:46am

Science
Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?
Monday, April 29, 2013 at 9:15am

Science
Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?
Monday, April 29, 2013 at 9:13am

Science
Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?
Monday, April 29, 2013 at 9:10am

science
what are the changes of statein which energy is increased
Sunday, April 28, 2013 at 10:35pm

science
How many grams of water, H(subscript 2)O, and propene, C(subscript 3)H(subscript 6), can be formed from the reaction of 6.0 g of 2-propanol, C(subscript 3)H(subscript 8)O?
Sunday, April 28, 2013 at 10:20pm

science
a boat weights 10,000 newtons what is the magnitude of buoyant force acting on boat in the fliud
Sunday, April 28, 2013 at 8:29pm

science
a 100 pound life guard dives underwater to save a 150 pound person who is drowning the life guard will be able to lift the person to the surface because a:the buoyant force acts as an upward force on the person b:the force of gravity is less in water c:the force of water is ...
Sunday, April 28, 2013 at 7:04pm

science
A sandstone observed in the field contains well-sorted, well-rounded, fine pitted and reddened grains. What does this tell you about the process that led to the deposition of this rock and the environment in which it formed? Please give your answer as a short phrase or sentence
Sunday, April 28, 2013 at 5:10pm

Science
Acetaldehyde, CH3CHO, will decompose into methane and carbon monoxide according to CH3CHO (g) -> CH4 (g) + CO (g) At 450C the rate of consumption of CH3CHO is measured to vary with the concetration of CH3CHO raised to the power 1.5. With a CH3CHO concentration of 0.222M, ...
Sunday, April 28, 2013 at 4:33pm

Physical Science
Four balls are taken to the top of a building. Ball 1 is dropped (zero initial velocity). Ball 2 is thrown straight up with a velocity of 3 m/s. Ball 3 is thrown straight out with a horizontal velocity of 3 m/s. Ball 4 is thrown straight down with a velocity of 3 m/s. Which ...
Sunday, April 28, 2013 at 1:36pm

life science
Write an assay to briefley explain how geographic isolation of a common ancestral species of finches has led to the development of 14 different species of finches in the galapagos islands
Sunday, April 28, 2013 at 1:03pm

School (Plz read, really important)
Am I eligible to get a President's Award for Educational Excellence or the President's Award for Educational Achievement and Daughters of the American Revolution??? Here are my grades from last year and this year so far and everything else I accomplish: 7th Grade - 93....
Sunday, April 28, 2013 at 12:40pm

Agricultural science
What are the important features of a building which could be used as a milking shed (parlour), dairy (milk room) and food store to ensure production of clean fresh milk?
Sunday, April 28, 2013 at 10:10am

Agricultural science
Outline and explain the objectives o fencing a farmland
Sunday, April 28, 2013 at 10:05am

Science
The density of ethanol is 0.789 g/cm3 at 20 degrees celsius. What is the mass of 150cm3 of this alcohol?
Sunday, April 28, 2013 at 9:48am

science
A car is travelling at 20m/s along a road. a child runs out into road 50m ahead and car driver steps on break paddle. what must car retardation rate be if the car is to stop just before it reaches the child?????
Sunday, April 28, 2013 at 5:23am

physical science
The shape of water molecule is (A)tetrahedral (B)linear (C)angular (D)trigonal planar
Sunday, April 28, 2013 at 3:23am

science
At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by è = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 (15 marks) a. At what time is the angular velocity of the motor shaft zero? b. Calculate the...
Saturday, April 27, 2013 at 11:56pm

Physical Science
A park ranger wants to shoot a monkey hanging from a branch of a tree with a tranquilizing dart. The ranger aims directly at the monkey, not realizing that the dart will follow a parabolic path and thus will fall below the monkey. The monkey, however, sees the dart leave the ...
Saturday, April 27, 2013 at 3:26pm

Science
I need pictural or written ideas in order to help make a drawn model to explain the greenhouse effect. I've used websites but they are to technical for what I'm looking for. I'm basically looking for a model but I can't copy any. Please give me your opinions.
Saturday, April 27, 2013 at 2:01pm

agricultural science
Any five purpose of fencing a farmland
Saturday, April 27, 2013 at 8:45am

Agricultural science
What are the important features of a building which could be used as a milking shed(parlour),dairy(milk room) and food store to ensure production of clean fresh milk?
Saturday, April 27, 2013 at 4:57am

Science
Urgently needed for my n.e.e.t test next week.. Calculator not allowed.. How do i find antilog of (-10.6) for solving a pH based question?? Please help!
Friday, April 26, 2013 at 11:50pm

computer science
What does it mean when there is a high prior probability in terms of Baynesian statistics?
Friday, April 26, 2013 at 4:55pm

physics for physical science
(a)what is the magnitude of the gravitational force of the earth on a surveillance satellite of mass 1040kg that is in a grazing circular orbit 100 km above the surface of the earth. (b)find the magnitude of the acceleration of the satellite in such a grazing orbit. (c)...
Friday, April 26, 2013 at 11:27am

physics for physical science
a bullet of mass 0.015kg strikes ballistic pendulum of mass 2.0kg .the center of mass of the pendulum rises a vertical distance of 0.12m.assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.
Friday, April 26, 2013 at 10:56am

science
Mary puts 50g of A into container X and another 50g of A into container Y. She found that the volume of A in containers X and Y are the same. What state of matter can A be?
Friday, April 26, 2013 at 4:02am

science
an object moving at a speed of 1m/s has a kinetic energy of 5 J what is its kinetic energy when it moves at 3m/s
Friday, April 26, 2013 at 12:10am

science
an object has a potential energy of 100 J when it is 10 m above the ground. if it were to fall without friction what would its kinetic energy be the instant it hits the ground
Friday, April 26, 2013 at 12:08am

science
What is the time of life when sex organs mature.
Thursday, April 25, 2013 at 11:59pm

Science
What are the diseases of the respiratory system?
Thursday, April 25, 2013 at 11:13pm

Science
What would the nucleus and the nucleolus on a farm be? and please explain why. thanks
Thursday, April 25, 2013 at 10:15pm

Science
What would the nucleus and the nucleolus on a farm be? and please explain why. thanks
Thursday, April 25, 2013 at 9:41pm

science
Calculate the heat of combustion of candle wax in kJ/mole. The standard heat of formation (∆Hf ) of candle wax (C20H42) is -2230 kJ/mole. The standard heat of formation (∆Hf ) of carbon dioxide is -394 kJ/mole. The standard heat of formation (∆Hf ) of water ...
Thursday, April 25, 2013 at 8:02pm

Science
I'm studding forces and motion what is the difference between velocity and speed.Thanks if you help:)
Thursday, April 25, 2013 at 6:37pm

science
imagine you are going swimming at night. you turn on the spotlights at the corners of your house. the lights are pointed towards the middle of the pool, which is right behind the center of your house. will the light rays from the spotlight be refracted when they strike the ...
Thursday, April 25, 2013 at 6:17pm

physical science
plan,design and condact an investigation to find out whether the amount of heat produced will depend on an increase on the concentration of HCl when HCl reacts with an excess Zn.
Thursday, April 25, 2013 at 5:08pm

science
What is the molality of 5.4g of potassium chloride (KCl) dissolved in 250 g of water?
Thursday, April 25, 2013 at 3:07pm

Science Check answer
******I WILL GIVE MY ANSWERS AFTER I POST THE QUESTIONS****** 1. Momentum is a measure of ____. how hard it is to stop an object the amount of matter in an object the tendency of an object to change its motion the amount of force acting on an object Use the following equation ...
Thursday, April 25, 2013 at 2:12pm

science
what are some characteristics bacteria have which viruses don't?
Thursday, April 25, 2013 at 1:30pm

agricultural science
Outline and explain the objectives of fencing a farmland
Thursday, April 25, 2013 at 11:43am

Science
During an experiment, you find that you can dissolve 3.6 g of a substance in 300 mL of water at 25°C. How much of the substance would you predict that you could dissolve in 600 mL of water at the same temperature? Can somebody help me with this? I don't get it.
Thursday, April 25, 2013 at 11:26am

Phsycal science research
10 ways in which the human or environmental problem impacts on the community about global warming
Thursday, April 25, 2013 at 10:49am

science
what pressure would be exerted by 35g of chlorine gas in a1.5 litre vessel at -37
Thursday, April 25, 2013 at 8:29am

Science
Need help on this question: Which telescopes out of the ones below collects and focuses on Gamma Rays? Arecibo Chandra Hubble Spitzer Thanks....
Wednesday, April 24, 2013 at 8:38pm

science
How do you test luster of a mineral?
Wednesday, April 24, 2013 at 5:47pm

science and english only for ms sue
what the steps to the water cycle and what is the writing process and what the steps for 7th grade and please help me as soon as possible please ms. sue...
Wednesday, April 24, 2013 at 5:39pm

Science..physics
The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the moon. b) ...
Wednesday, April 24, 2013 at 4:17pm

Physical science
A ball is thrown up at 8m.s from the roof which is 60m high.it strikes the balcony below after 4s.the ball then bounces off the balcony and strikes the ground.ignore the effects of friction.calculate magnitude of the velocity at which the ball strike the balcony?
Wednesday, April 24, 2013 at 4:08pm

Science....Need Help!!!
I'm doing a project based on the Greenhouse Effect. Things that I need to include: 1) EXPLAINED the greenhouse effect using the big idea of energy transfer. (I need to explain, I've already described. 2) EXPLAINED the causes and LONG-TERM effects 3)Designed a NEW (my ...
Wednesday, April 24, 2013 at 2:47pm

Science
Waves carry energy from place to place without carrying matter. true false I think it is true??
Wednesday, April 24, 2013 at 12:06pm

Science
Using two or three well-developed paragraphs, describe how energy is transferred from the sun to producers and on to consumers. Provide at least one example.
Wednesday, April 24, 2013 at 11:44am

Science
Is it possible that man may be able to colonize Neptune someday?
Tuesday, April 23, 2013 at 8:20pm

social science
A paragraph explaning how the swahili langauge came into being
Tuesday, April 23, 2013 at 3:54pm

Science question
A battery is not used in flashlight microwave portable radio cell phone I think microwave?
Tuesday, April 23, 2013 at 3:32pm

Science-Greenhouse Effect
I need to design a NEW model for the atmosphere that covers the shortfallsin the greenhouse model. Any suggestions?
Tuesday, April 23, 2013 at 3:06pm

science
When 10grams of sodium chloride, NaCL,dissolves in 100grams of water, the freezing point of the water gose down to -5.9C. when 10grams of table sugar C H O, dissolves in 100grams of water, the freezing point only goes down to - 0.56C. how do yo0u account for this difference?
Tuesday, April 23, 2013 at 2:29pm

Science-Greenhouse Effect
What actions can people take to help reduce the greenhouse effect? PLEASE ANSWER ASAP!!
Tuesday, April 23, 2013 at 1:51pm

Science-Greenhouse Effect
What is the electromagnet spectrum? PLEASE ANSWER ASAP...I REALLY NEED HELP!!
Tuesday, April 23, 2013 at 12:38pm

LIFE SCIENCE(G12)
state two effects of gibberellin on seed germination
Tuesday, April 23, 2013 at 12:28pm

World Geography
Cultures often develop along with science and ____________.
Tuesday, April 23, 2013 at 11:09am

science
Why do you have to filter the Ca(OH)2 solution before loading it into the burette?
Tuesday, April 23, 2013 at 9:52am

science
If solid iodine sublimes to produce iodine gas:write down the equation for the reaction
Tuesday, April 23, 2013 at 7:57am

Science-Greenhouse Effect
Described the greenhouse effect using the big idea of energy transfer?....PLease answer ASAP
Tuesday, April 23, 2013 at 6:42am

Science/DUE TODAY
please help!!! quick!!! How is a polar bear adapted to living in a desert? (behavioural and physical)!!! write something that is a good answer and that i can understand.
Tuesday, April 23, 2013 at 2:28am

science
what is the product when barrium chloride react with ammonium dichromate?
Tuesday, April 23, 2013 at 1:11am

Science
How do I calculate between the race of two automobiles in kilometer speed this is a 8th grade science question
Monday, April 22, 2013 at 10:09pm

constitution/essay
Write your paper about a hypothetical proposal that is before the elected school board for the public schools in your city. The proposal stirs deep controversy in the community. Opponents claim that it would violate the Constitution’s prohibition against an “...
Monday, April 22, 2013 at 7:13pm

science
If the current in a wire is at 0.5 A and the voltage is measured at 100 volts, what is the resistance in the wire? Show all work and include the proper units.
Monday, April 22, 2013 at 5:53pm

psychology
what makes social psychology unique in terms of social science
Monday, April 22, 2013 at 5:36pm

science
Explain how heat is transferred between a hot and a cold object by conduction — for example, a warm foot on a cold floor.
Monday, April 22, 2013 at 3:27pm

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 ...
Monday, April 22, 2013 at 1:30pm

Agricultural science
What are the important features of a building which could be used as a milking shed (parlour),diary (milk room) and food store to ensure production of clean fresh milk?
Monday, April 22, 2013 at 1:02pm

Physics
Visitors at a science museum are invited to sit in a chair to the right of a full-length diverging lens (f1 = -3.3 m) and observe a friend sitting in a second chair, 1.94 m to the left of the lens. The visitor then presses a button and a converging lens (f2 = 4.36 m) rises ...
Monday, April 22, 2013 at 1:02pm

Science Help! Ms. Sue Please!
8. Which of the following explains why the chemical products from a reaction have a different mass than the chemicals at the beginning? The products are heavier and sink. The products are lighter and rise. The products are a gas and escape into the air. The products are a ...
Monday, April 22, 2013 at 12:20pm

agricultural science
outline and explain the objectives of fencing a farm?
Monday, April 22, 2013 at 9:02am

science
comets orbit the sun in a what pattern
Sunday, April 21, 2013 at 8:18pm

Science
When will an object float on a fluid's surface? My answer: An object will float on a fluid's surface if only the object is less dense than the fluid?
Sunday, April 21, 2013 at 7:35pm

Physical Science
When will an object float on a fluid's surface? My answer: An object will float on a fluid's surface if only the object is less dense than the fluid?
Sunday, April 21, 2013 at 7:10pm

Science
Joe pushes a lawn mower four times as far as Mary while exerting only half the force, who does more work? And by how much?
Sunday, April 21, 2013 at 3:58pm

Science
Are the ions of a metal very different from the atoms of a metal?
Sunday, April 21, 2013 at 3:07pm

Science
Doe sodium chloride completely dissolve,partially dissolves or insoluble
Sunday, April 21, 2013 at 11:40am

agricultural science
outline and explain the objectives of fencing a farmland?
Sunday, April 21, 2013 at 10:07am

agricultural science
outline and explain the objectives of fencing a farmland?
Sunday, April 21, 2013 at 10:02am

agricultural science
outline and explain the objectives of fencing a farmland?
Sunday, April 21, 2013 at 9:58am

Computer Science
What is the fastest way to compare two strings containing only numbers. eg: "3423492349328492343.939842903482304" "349832498234932.92384924893294343" There can be at max 20 numbers before and after the decimal place. The majority will be ...
Sunday, April 21, 2013 at 1:07am

8th grade science
the question is: "The absolute magnitude of a star is -12.. How would you describe its brightness?"
Saturday, April 20, 2013 at 8:09pm

Agricultural science
Describe how a farmer would maintain a laying flock in one of the systems you have named and use these headings:Housing,Feeding,and Maintenance of Health.
Saturday, April 20, 2013 at 11:19am

Agricultural science
From your research on poultry farming,name one intensive and one extensive system of poultry keeping(farming).
Saturday, April 20, 2013 at 11:12am

Agriculral science
Explain how any three of these records should be used to improve management.
Saturday, April 20, 2013 at 11:09am

Agricultural science
State and explain what records should be kept for the efficient management of a dairy herd.
Saturday, April 20, 2013 at 11:04am

Agricultural science
What are the important features of a building which could be used as a milking shed(parlour),dairy(milk room)and food store to ensure production of clean fresh milk?
Saturday, April 20, 2013 at 11:00am

Agricultural science
Draw a diagram to show the arrangement of poles at a corner or where a fence changes direction.
Saturday, April 20, 2013 at 10:55am

Agricultural science
What types of fences can be used?
Saturday, April 20, 2013 at 10:50am

Agricultural science
Outline and explain the objectives of fencing a farmland
Saturday, April 20, 2013 at 10:46am

Agricultural science
Outline and explain the objectives of fencing a farmland.
Saturday, April 20, 2013 at 10:39am

science
To get an A grade on the test, you need a total score of more than 16 points. One of the students knows the correct answer to 6 of the 20 questions. The rest she guesses at random by tossing a coin (one toss per question, as in 4B). What is the chance that she gets an A grade ...
Saturday, April 20, 2013 at 10:22am

Physical science
To investigate whether the amount of heat produced will depend on an increase on the concentration of HCL when HCL reacts with an excess Zn
Saturday, April 20, 2013 at 8:38am

Agricultural science
Outline and explain the objectives of fencing a farmland.
Saturday, April 20, 2013 at 8:11am

science
find out the volume of 0.05M HCL requred, in ml,in order to neutralise 0.2M Naoh of 40 ml.
Friday, April 19, 2013 at 10:07pm

Science
NEED HELP PLEASE THANK U U R NICE :) Describe how burning fossil fuels has created an imbalance in the carbon cycle. Most people drive cars and heat their homes with petroleum, coal, or natural gas. Why is it important to find alternatives for these sources of energy? What are...
Friday, April 19, 2013 at 7:11pm

science
suppose you are standing on a sidewalk . describe your motion relative to the car and the plane
Friday, April 19, 2013 at 7:01pm

Science
Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is greater than the ...
Friday, April 19, 2013 at 6:47pm

Science
Which of the following is NOT a possible sign of a chemical change? (1 point) a change in state a change in color the release of a gas the release of energy
Friday, April 19, 2013 at 6:46pm

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