Balancing Chemical Equations

Chemical Reactions

100

What is the Reactant of the chemical equation and where is it located?

The reactant is the original equation and it is always located on the left side of the equation.

200

What is the Product of a chemical equation and where is it located?

The product is the chemical change or new substance. It is always located on the right side of the equation.

300

Identify the reactants and products in the following chemical equation: H2 + NaCl ---> H2Na + Cl + S

Reactants: H, Na, Cl Products: H, Na, Cl, S

400

What does the law of conservation of mass states?

The law of conservation of mass states that matter durning a chemical change can neither be created nor destroyed.

500

What is the meaning of a subscript? Also, how many atoms does each element have in the following chemical equation: NaOH + H2CO3 ---> Na2CO3 + H2O *Note - All the numbers are subscripts

A subscript is written below. Reactant - 1Na, 4O, 3H, 1C Product - 2Na, 1C, 4O, 2H

Vocabulary

100

By definition, the Law of Conservation of Mass states that matter (mass) may not be __________ nor _________ .

What is created / destroyed.

200

This is the force that holds atoms in an ionic compound together

What is electrostatic force?

300

Twelve grams of reactant X react with fifteen grams of reactant Y. This is the total mass of the product(s).

What is twenty seven grams?

400

This statement explains the difference between exothermic and endothermic reactions.

What is endothermic rxns result in lower temperatures (energy is a reactant) while exothermic rxns result in higher temperatures (energy is a product)?

500

this number represents the number of each atom in a compound or molecule

subscript

Balancing Chemical Equations

100

Balance the following equation: _____H2 + ____O2 ---> ____H2O

2 H2 + 1O2 ---> 2H2O

200

Balance the following Equation: _____KClO3 ---> KCl + ______O2

2KClO3 ---> 2KCl + 3O2

300

Balance the following equation: ____C3H8 + _____O2 ---> ____CO2 + ____H2O

1C3H8 + 5O2 ---> 3CO2 + 4H2O

400

Balance the following equation: ____P + _____O2 --->_____P2O5

4P + 5O2 ---> 2P2O5

500

Balance the following equation: ___NaBr + ____CaF2 ---> ____NaF + ____CaBr2

2NaBr + 1CaF2 ---> 2NaF + 1CaBr2

Random

100

the diatomic elements are:

H O F Br I N Cl

200

this is what happens to electrons in an ionic compound

electrons are transferred

300

this is an example of what type of reaction:

2Al  +  Fe₂O₃  --> 2Fe  +  Al₂O₃

single displacement

400

how many atoms are in this compound?

(NH₄)₂SO₄

15

500

if 5 grams of hydrogen react with oxygen to form 12g of water, how many grams of oxygen reacted?

7 g

Types of reactions

100

one product is produced

synthesis

200

an element reacts with an ionic compound to produce a new element and a new ionic compound

single displacement

300

two ionic compounds producing two new ionic compounds

double displacement

400

one reactant produces two or more products

decomposition

500

burning something

combustion