Property changes in chemical reactions,

................... is a description of a reaction using element symbol and chemical formula

• a chemical equation

• a chemical structure

In a chemical equation, on what side of the arrow are the reactants?

• right

• left

In a chemical equation, on what side of the arrow are the products? 

• right

• left

True or False?  During a chemical reaction a new substance (or substances) is produced.  

• True

• false

Count the total number of atoms in the chemical formula: 5H₂O₂

• 5

• 8

• 10

• 20

Identify the total number of molecules in the chemical formula: 6CH₄

• 5

• 10

• 6

• 20

. 

Which of the following can be changed to balance a chemical equation? 

• products 

• element symbols 

• coefficients 

• subscripts 

. 

A chemical equation is balanced when the number of each type of __________ is the same on both sides of the yield sign.

• compound

• molecule

• atom 

• fotmula

Which of the following equations is balanced?

• 2H₂ + O₂ ---> H₂O

• H₂ + 2O₂ ---> 2H₂O

• H₂ + O₂ ---> H₂O

• 2H₂ + O₂ ---> 2H₂O

Which coefficient will balance the following equation?Zn + ___ HCl --> ZnCl₂ + H₂

• 2

• 4

• 6

• 3