What is the percent by mass of oxygen in propanal, CH3CH2CHO? (1) 10.0% (3) 38.1%

(2) 27.6% (4) 62.1%

What is the volume of 88 grams of CO2 gas at STP?

Fill in the coefficients that will balance the following reaction: ao C3H8 + a102 → a2CO2 + a3H20

The density of a substance is a. an indication of how tightly packed its particle are b. a physical property c. dependent on the temperature d. the ratio of its mass to its volume. e. all of these are correct.

FeBr2 after dissolved in water

List two ways in which heterogeneous mixtures differ from elements.

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?

Ammonium acetate chemical formula