Chemical Reactions

The reaction equation below shows the process of forming water. Balance the equation by calculating the coefficients. H2 + O2 H2O

2,1,2

The balanced chemical equation for the combustion of butane is:

2C4H10 + 13O2 8CO2 + 10H2O

Which one of the following equations represents the net ionic equation for the reaction between aqueous potassium chloride and aqueous silver nitrate?

Cl- (aq) + Ag+ (aq) AgCl (s)

What will happen if there is an insufficient supply of oxygen during the combustion of a hydrocarbon?

Elemental carbon and carbon monoxide may be formed along with carbon dioxide and water.

Identify which of the following reactions is/are (a) combustion reaction(s). A. CH4 + 2O2 CO2 + 2H2O B. 2H2O 2H2 + O2 C. 2Na + Cl2 2NaCl

Only reaction A is an example of a combustion reaction.

Which of the following decomposition reactions is/are correct? A) 2NaOH 2Na + O2 + H2 B) 2NaOH 2Na + H2O + 1/2O2 C) 2NaOH Na2O + H2O D) 2NaOH 2Na + H2O2

Only reaction C is correct.

When magnesium carbonate (MgCO3) decomposes, it produces a metal oxide and a gas. Predict the products of this reaction.

magnesium oxide (MgO) and carbon dioxide (CO2)

Which of the following reactions represents a decomposition reaction?

metal carbonate metal oxide + carbon dioxide

Hydrocarbons, such as methane (CH4) or propane (C3H8), are chemical compounds that contain carbon and hydrogen. When a hydrocarbon undergoes combustion, it reacts with and produces .

oxygen; carbon dioxide and water

Predict the products in the following neutralization reaction. KOH(aq) + HC2H3O2(aq) ?

potassium acetate and water

Predict the products resulting from the decomposition of sodium chlorate.

sodium chloride and oxygen gas

If a sample of hydrochloric acid is neutralized with sodium hydroxide, what products are formed?

sodium chloride and water

A sample of copper powder is heated in an evaporating dish using a bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that

the copper must have combined with another substance.

According to the law of conservation of mass, the mass of the reactants in a reaction must the mass of the products in a reaction.

to be equal to

Which of the following color changes indicates that a chemical reaction has occurred?

a solution changing from blue to yellow on the addition of acid

Cl2(g) + 2NaBr(aq) 2NaCl(aq) + Br2(l) The reaction given above is a single replacement reaction because:

chlorine replaces bromine