2 Balancing Chemical Equations

Based on the chemical equation provided, use the drop-down menu to choose the coefficients that will balance the chemical equation.

(2)H2 + (1)O2 --> (2)H2O

The chemical equation provided shows iron rusting to form iron oxide. Use the drop-down menu to choose the coefficients that will balance the chemical equation.

(4)Fe + (3)O2 --> (2)Fe2O3

Conservation of Mass

-According to the law of conservation of mass, the total mas of all substances going into a chemical reaction must be the same as the total mass of all substances coming out of a chemical reaction -Balanced chemical equations express the law of conservation of mass

Steps for Balancing Equations:

-Identify the elements on each side -Counts the atoms of each element on each side

Haber Process

-Nitrogen gas and hydrogen gas react to form ammonia -Based on the balanced equation 3 hydrogen atoms are needed for 1 nitrogen atom

Steps for Balancing Equation:

-Use coefficients to balance the number of each type of atom one at a time -Double-check the coefficients

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?

2 in front of water and 1 in front of oxygen

Balancing out chemical reactions

Before Reaction: flask + balloon + vinegar + baking soda = 430 g After Reaction: flask + balloon + vinegar + baking soda + gas = 430 g

Equation: KCIO3

Reactants: K 1 CI 1 O 3 Products: K 1 CI 1 O 2

Magnesium burns the presence of oxygen to produce magnesium oxide.

Reactants: 2Mg + O2 Mg: 2 O: 2 Products: 2MgO Mg: 2 O: 2

The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath. AB + CD → AC + BD (15 g) (?) (?) (10 g) The total mass of the products is 50g. Which best completes the other two amounts?

The amount of CD is 35 g, and the amount of AC is 40 g.

What does it mean for a chemical equation to be balanced?

The number of each type of atom is the same for both the reactants and products.

ammonia

a chemical used in cleaning products; made up of one nitrogen atom and three hydrogen atoms

system

a group of related objects that interact and form a complex whole

subscript

a letter, number, or symbol that is smaller and just below the normal line of type

law of conservation of mass

a natural law stating that the same amount of mass is present before and after a chemical reaction

coefficient

a number that indicates how many times to multiply a variable

chemical equation

a shorthand that uses chemical symbols and molecular formulas to show what occurs during a chemical reaction

law of conservation of mass

natural law that states the same amount of mass is present before and after a chemical reaction

products

the chemicals present after a chemical reaction occurs

reactants

the chemicals present before a chemical reaction occurs

balance

the state of being in equal amounts For a chemical equation to be balanced the number of an atom needs to be the same on both sides