Now molecules

molecules of H,

molecules of 02

" molecules of H2O

Which of the following is not an example of a naturally occurring greenhouse gas

Are phase changes physical or chemical changes? why?

What is rubbing alcohol? Is it an element or compound?

There are two possible isomers of the product acetal that could conceivably be formed. a) Draw them, and make sure you use the chair conformation of the 6-membered ring b) Which of those two conformations is the most favorable? Explain your answer.

You started with 64 g of a radioactive substance. If you have 4.0 g of that substance left, then how many half-lives have elapsed? a. 2 b. 3 c. 4 d. 5

Identify the combustion reaction. c4h12 + 7o2 ⟶ 6h2o + 4co2 2h2 + o2 ⟶ 2h2o al2s3 ⟶ 2al + 3s cl2 + 2kbr ⟶ 2kcl + br2

A water molecule consists of an oxygen atom and two hydrogen atoms covalently bonded in a bent shape. Oxygen however, attracts the shared electrons more strongly than the hydrogen atoms. This structure leads to which important property of water? a.

How much ko2 is needed to react with 75.0 l of carbon dioxide at - 25˚c and 215 kpa?

Is limestone a mixture or a pure substance

What is the number of electrons in the outermost energy level of an oxygen atom