Chemical Reaction Chap 2

What is: A tiny piece that all matter -- all the stuff in the world -- is made of?

• Atom

• Salt

• Chemical formula

• Chemistry

What is the temperature at which a substances changes from a liquid to a gas called?

• Melting point

• Boiling point

• Freezing point

• Condensation

Which is an example of a chemical formula?

• 21

• Sugar

• NaCl

• Salt

What is a chemical formula?

• Letter and numbers showing the types and amounts of atoms that repeat to make up a substance

• How you build a chemical

• Numbers that tell us how many electrons are in an atom

• No idea...

What is the process called when atoms rearrange to form new substances?

• Rust

• Chemistry

• Chemical reaction

• Explosions

What does the melting point temperature tell us?

• When something changes from solid to liquid

• When something changes from liquid to solid

• When something changes from liquid to gas

• When something changes from gas to liquid

What is a molecule?

• A proton

• A group of electrons joined together in a particular way

• Atoms

• A group of atoms joined together in a particular way

Where do we see the reactants of a chemical reaction?

• Before the reaction

• After the reaction

Where do we see the products of a chemical reaction?

• Before the reaction

• After the reaction

What happens to atoms during a chemical reaction?

• The atoms totally change

• The atoms rearrange themselves

• Chemical reactions have nothing to do with atoms

• The atoms leave the substance