Balancing Chemical equation

The ____________ in a chemical equation represent relative amounts of reactants and products.

• subscripts

• coefficient

• superscript

• both A and C

Which quantitative information is/are revealed by a chemical equation?

• Number of molecules of each compound

• Number of atoms of each element

• The state of each reactant

• Number of molecules of each compound and Number of atoms of each element

Which of the following set of coefficients correctly balance the chemical equation below?

• 1 : 2 : 1 : 1

• 2 : 1 : 2 : 1

• 1 : 1 : 1 : 1

• 2 : 1 : 1 : 1

For the following reaction to be balanced, the coefficient of oxygen needs to be _______.

CH4 (g) +____O2 (g) ⟶ ___ CO2 (g) +___ H2O (g)

• 2

• 3

• 4

• 6

Chemical equations must be balanced because in a chemical reaction the _____.

• mass is conserved

• volume is conserved

• state of reactants is conserved

• atoms are destroyed and recreated

Which of the following is a correct balanced chemical equation?

I. 2Cu (s) + O2(g) → 2CuO (s)

II. 2H2S (g) + 3O2(g) → 2SO2(g) + 2H2O(g)

III. 6CO2(g) + 6H2O(l) → C6H12O6 (s) + 6O2(g)

• I

• II

• III

• I, II and III

The correct balanced chemical equation for the combustion of carbon, C, is __________.

• C (s) + O2 (g) ⟶ CO2 (g)

• CO2 (g) + O2 (g) ⟶ C (s)

• CO2 (g) ⟶ C (s) + O2 (g)

• C (s) + O2 (g) ⟶ CO3 (g)