What are substances that cannot be broken down into simpler substances?

a. mixtures

b. solutions

c. elements

d. molecules

Which of the following is a ectothermic vertebrate a. butterfly b. lizard c. eagle d. dog

What is the mass in grams of 19.26 mL of acetone? The density of acetone is 0.7857g/cm^3

Which of the following would introduce bias into an experiment? A. publishing your experimental results in a scientific journal B. allowing other scientist to repeat and verify your experimental results C.

Suppose you have made the following hypothesis: The greater the height from which you drop a ball, the faster the ball will be traveling when it hits the ground because gravity has more time to speed it up.

By 1700, how many elements had scientists discovered and isolated? a. 13 b. 27 c. 46 d. 7

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?

What are the products of the alpha decay of Iodine-131?