What kind of change occurs if a substance changes into a new substance?

Which particle of the atom has no charge? a. neutron b. electron c. nucleus d. proton

What particle was discovered by Curie?

Which statements describe how chemical formulas, such as H2O, represent compounds? Select three options. They show the types of molecules that make up an atom. They show the elements that make up a compound.

Which most likely represents the process of dissolving carbon dioxide in soda? v

How did early chemists determine which substances were elements? a. by observing chemical reactions b. by finding the atomic mass c. by counting neutrons d. by counting protons

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

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?