Chemical Reactions 2.5 - Key Concepts Review

True or false: Different substances have different properties.

• True

• False

Things that are too small or too large to see can be studied with _________.

Substances have different ​ (a)   because they are made of different ​ (b)   of ​ (c)  

• atoms
• properties
• groups
• chemicals

True or false: Different groups of atoms vary in the type of atoms that make up the group.

• True

• False

Groups of atoms __________ to make up a substance.

During a chemical reaction, one or more starting substances (​ (a)   ) change into one or more different substances (​ (b)   ).

• reactants
• products

During a chemical reaction, atoms ________ from one type to another.

• Change

• Do not change

During a chemical reaction, atoms ​ (a)   to form different groups of atoms.

• rearrange
• combine
• disappear
• multiply