Which of the following chemical compounds contains two hydrogen atoms in every molecule?

A.

water (H2O)

B.

molecular oxygen (O2)

C.

carbon dioxide (CO2)

D.

calcium carbonate (CaCO3)

What is the percent Hydrogen in glucose

Which characteristics is not a characteristic of plastic? A. Easy to mold B. Good conductor of heat C. Lightweight and durable D. Repels water.

Which of the following is true for all chemical reactions? a. The total mass of the reactants increases. b. The total mass of the products is greater than the total mass of the reactants. c.

Harry uses a pulley to pull up a bucket of water from a well. He uses chemical energy in his body to apply mechanical energy to the system. Which of the following energy transformations also occurs as the bucket rises?

What information is given for each element on the periodic table?

Why is conductivity be the best test to find a metal, non-metal or metalloid?

In which way does a na1 + ion differ from a neutral na atom?

Which would not be associated with stable atmospheric conditions afternoon thunder showers is the answer

Which is not a characteristic of a compound? It is a mixture of elements. It has properties that differ from its component elements. It has a fixed proportion of elements.

Can you think of other possible ways scientists can determine what climate was like in the past besides studying ice cores?