Consider the following reaction: CaCO3(s) --> CaO(s) + CO2(g) A mixture of calcium oxide (CaO) and calcium carbonate (CaCO3) had a mass of 15.08 g and was heated to above 840 oC. After heating, 9.83 g of solid was left. What is the mass percentage of CaCO3(s) in the ...
Tuesday, December 30, 2014 at 12:25pm
Research suggests that American students lack a sufficient education in math and science to compete globally. How does the controversy about teaching evolution affect and reflect this problem?
Monday, December 29, 2014 at 6:24pm
1)Name one way in which our government dictates the administration of vaccines to children. 2)What were the three major outbreaks of influenza during the 20th century and how did governments understand and respond to these outbreaks?
Sunday, December 28, 2014 at 9:20pm
life science,geography,maths lit,business studies
im going to grade11 next year and im doing those subject.Im confused! i don't know where the subject taking me to.Please help me,which jobs are related with my subjects?
Friday, December 26, 2014 at 10:42am
A wire of resistance 12 ohm per metre is bent to form a complete circle of radius 10 c.m.the resistance between its two diametrically opposite point A and B
Friday, December 26, 2014 at 12:39am
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Tuesday, December 23, 2014 at 7:04pm
TRUE OR FALSE The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE Isobars help meteorologists find fronts on weather maps. MY GUESS: FALSE A CLOUD IS A COLLECTION OF WATER ...
Monday, December 22, 2014 at 6:12pm
The various groups who make up the US public have different expectations of science. How do these differing expectations of science affect the ways groups place trust in science? Describe one example of a controversial expectation that the author gives. Resnik, D. (2011). ...
Sunday, December 21, 2014 at 5:21pm
For questions #14 16, write an equation for the reaction of magnesium oxide with sodium chloride to produce magnesium chloride and sodium oxide. 14. Show the formulas of the reactants. 15. Show the formulas of the products. 16. Write the balanced the equation for this ...
Saturday, December 20, 2014 at 8:43pm
Explain the concept of public trust as the author uses it. Resnik, D. (2011). Scientific Research and the Public Trust. Science & Engineering Ethics, 17(3), 399-409
Friday, December 19, 2014 at 1:18pm
I'm writing a thesis/research paper on how all animals play an important role on the environment. I'm trying to narrow my paper down on an endangered species but I'm having trouble deciding/thinking of a species that play IMPORTANT roles (ie.- honeybees). Except I ...
Friday, December 19, 2014 at 1:03pm
Balancing Decay Reactions. Fill in the blank with the correct piece to balance the decay equation. 1. (184/74) W (4/2) He + _____ 2. (210/82) Pb______+ (206/80) Hg 3. (35/16) S (0/-1) e + _______ 4. ________ (0/-1) e + (60/28) Ni My work: 5. (...
Friday, December 19, 2014 at 12:35pm
Check my answers please? Imagine that you remove all the atoms from a chair. What remains? 1. nothing 2. a pile of dust I choose 1. Which of the following is not made of atoms? 1. heat 2. a solid 3. a gas I choose 1. What about matter is true? 1. atoms are not matter but they ...
Thursday, December 18, 2014 at 7:30pm
Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait? A- homozygous B- dominant C- heterozygous D- recessive My guess is A.
Thursday, December 18, 2014 at 4:40pm
Calculate the weight of gold having specific heat capacity 0.13 joule which is heated from 25 degree c to 300 degree c, where the heat absorbed is 1500 joule?
Thursday, December 18, 2014 at 10:31am
A circular disk is rotating in a horizontal plane with a time period 3.14 second.At what distance from the center a coin of mass 10 gram may be kept so that the coin coin may remains stationary the coefficient of friction is 0.52?
Thursday, December 18, 2014 at 9:07am
Science Please Check!
Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait? A- homozygous B- dominant C- heterozygous D- recessive My guess is D. Please help!
Thursday, December 18, 2014 at 12:27am
The mean of Susan's math and science scores is 74 points. The mean of her math and English scores is 83 points. How many more points did Susan score in English than in science?
Wednesday, December 17, 2014 at 7:29pm
A mover is pushing a crate across the floor. He exerts a force of 500 Newtons and pushes the crate a distance of 5 Meters. How much work did the mover do on the crate?
Wednesday, December 17, 2014 at 9:50am
Graph Theory/ Algorithms / Computer science
I am working on this problem from the book, Data Structures & Algorithm Analysis in C++. The problem is: 9.40 Give a polynomial-time algorithm that ﬁnds ceil(V /2) vertices that collectively cover at least three-fourths (3/4) of the edges in an arbitrary undirected ...
Wednesday, December 17, 2014 at 12:25am
why is it rare for the soft parts of an organism to become a fossil? a) the soft parts take a long time to decay b) the soft parts can be eaten by animals***** c) the soft parts cannot be buried in sediment d) the soft parts form petrified fossils which of the following terms ...
Monday, December 15, 2014 at 10:01pm
science 1 question
which of the following is an example of an effect of natural selection? All of the children of two parents are male. Carbon cycles through ecosystem. Favorable environmental conditions cause an increased food supply. Polar bears have white fur. Is the answer C?
Monday, December 15, 2014 at 8:43pm
1.Some plastics are made from corn. These plastics are biodegradeable. This means that plastics made from corn will (blank) than regular plastic My answer decompose faster 2. In the ocean, there are areas where there are very few living things. (Blank) is the term that ...
Monday, December 15, 2014 at 8:11pm
9. If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis? There is a picture but I cant upload it. Please help me!
Monday, December 15, 2014 at 6:47pm
In the ocean, there are areas where there are very few living things. (Blank) is the term that described when this happens to a natural gas. My answrer Aquaculture Am I right?
Monday, December 15, 2014 at 5:10pm
A homeowner determined that he used 114 gallons of oil every month to heat his home in the winter. This information would be considered part of his My answer Carbon footprint Am I right?
Monday, December 15, 2014 at 4:53pm
To solve the problem of a polluted stream a scientist traced where the pollution was coming from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of (blank) pollution ...
Monday, December 15, 2014 at 4:01pm
Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal ...
Monday, December 15, 2014 at 11:31am
The speed of light is 3 x 10 to the 8th power meters per second. If the sun is 1.5 x 10 to the 11th power meters from earth, how many seconds does it take light to reach the earth?
Monday, December 15, 2014 at 7:06am
1. Which of the following types of pollution cannotbe attributed to car and truck emissions? A. Acid rain B. Sedimentation C. Ozone D. Photochemical smog 2. In which of the following places is it more difficult to determine if there is pollution? A. Aquifer B. Stream C. Air D...
Monday, December 15, 2014 at 1:25am
1. Running the dishwasher only when it is completely full is an example of A. Increases resource use B. Using nonrenewable resources C. Using renewable resources D. Reducing resource use 2. Cotton is a plant used to make clothing. Cotton would best fit into which of the ...
Monday, December 15, 2014 at 1:01am
How does using coal to generate electricity affect the enviroment? A. Using more coal reduces the amount of pollution from using oil. B. Using coal improves the quality of nearby water. C. Using coal, instead od wood from trees, helps improve the inviroment. D. Using coal ...
Monday, December 15, 2014 at 12:36am
What is the formula of magnesium sulfate and ammonia? My work:MgSO4 + 2NH4OH --> (NH4)2SO4 + Mg(OH)2 Correct/Balance the equation below. MgSO4 + NH4OH → (NH4)2SO4 + Mg(OH)2
Monday, December 15, 2014 at 12:00am
Solar,wind,nuclear,and hydorelectric energy sources are similar in which of the following ways? A. They are all nonrenewable energy sources. B. They all require an indirect use of sunlight in order to make electricity. C. They are all considered alternative energy sources. D. ...
Sunday, December 14, 2014 at 11:22pm
Which of the following energy sources is relativelyexpensive to set up, but has a low cost once it is in place? A. Natural gas B. Coal C. Nuclear power D. Solar power Is the answer D?
Sunday, December 14, 2014 at 9:21pm
Can someone actually help me with this...? Instead of telling me to use my books... (My school does NOT give us books.!) How is incomplete dominance different than dominance? Explain why incomplete dominance only occurs in this genotype?
Sunday, December 14, 2014 at 11:04am
1. Running the dishwasher only when it is completely full is an example of A. Increasing resource use. B. Using nonrenewable resources. C. Using renewable resources D. Reducing resource use*** 2. Cotton is a plant used to make clothing. Cotton would fit best into which of the ...
Sunday, December 14, 2014 at 12:19am
1. Which of the following describes an example of land reclamation? A. After an area is mined for copper, the soil is replaced and new plants are planted. B. After a forest is clear-cut, desertfication occurs. C. After a forest is clear-cut, is mined for copper. D. After an ...
Saturday, December 13, 2014 at 11:46pm
An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: There will be a large difference ...
Saturday, December 13, 2014 at 12:39pm
An airplane with a speed of 27.4 m/s is climbing upward at an angle of 48° counterclockwise from the positive x axis. When the plane's altitude is 860 m the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath ...
Friday, December 12, 2014 at 8:06pm
which of the following was true of the age of reason? a. people justified their faith using scientific principles b. people valued science over faith c. people debated the raison detre
Friday, December 12, 2014 at 7:54pm
A polo player hits a ball with a mass of 0.42 kg with a force of 7.35 Newtons. How does the force the polo player's mallet exerted on the ball compare to the force the ball exerted on the mallet? A. The force of the mallet on the ball is equal in magnitude and opposite in ...
Friday, December 12, 2014 at 5:45pm
2) Which is not an example of matter? A. water B. air(i think it this one) C. gold D. sound 3) The amount of space an object occupies is called its ..... A. volume(i think it this one) B. mass C. electricity D. gravity 4) Atoms in a molecule are joined together by.. A. ...
Friday, December 12, 2014 at 9:51am
When magnesium oxide (MgO) and water (H20)react, they produce magnesium hydroxide Mg(OH)2. Magnesium hydroxide is a medicine used to treat an upset stomach. The equation for this chemical change is shown below: MgO + H20 --> Mg(OH)2 if 40.00 grams of magnesium oxide and 18....
Thursday, December 11, 2014 at 10:54pm
A couple has just learned that their daughter has hemophilia. They already have a son who does not have the disease. What are the genotypes of the couple? Explain your reasoning.
Thursday, December 11, 2014 at 4:23pm