Chemical Symbols and Compounds

A _____________ reaction in which energy is taken in and it would feel cold.

• exothermic

• endothermic
• ionic

A _________ reaction is a chemical reaction in which energy is given off and it would feel warm.

• Exothermic
• Endothermic

• Covalent

The "rearranging' of reactants in a chemical equation is called a _______.

• Reactants

• product
• yields sign

________ occur when substances combine and/or separate to form new substances.

• chemical reactions
• chemical formulas

• explosions always

The small numbers that indicate the number of atoms of each element are called _____

• subscripts

• superscripts

• bonding

Chemical symbols used to represent compounds are called ________.

• chemical formulas
• subscripts

• coefficients

A number written in front of a chemical symbol that indicates the number of atoms of an element or compound are called ________.

• chemical formulas

• coefficients
• reactants

In a chemical reaction, the substances that you start with are called _______ (ingredients).

• coefficients

• reactants
• products

In a chemical reaction, the substances that are formed are called _______.

• subscripts

• coefficients

• products

Give the total number of atoms in the following formula: Cu₂O₃

• 3

• 4

• 5