Writing and Balancing Chemical Equations

In a chemical equation, which symbol should be used to indicate that a substance is in solution?

(aq)

The chemical equation for the formation of ammonia is unbalanced. 3H2(g) + N2(g)→NH3(g) If three molecules of hydrogen react with one molecule of nitrogen, how many molecules of ammonia would be formed?

2

This formula equation is unbalanced. P4(s) + Cl2(g)→PCl3(l) Which coefficient should be placed in front of PCl3 to balance this equation?

2

Which formula equation represents the burning of sulfur to produce sulfur dioxide?

A.

What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase?

C.

Which formula equation shows a reversible reaction?

C.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?

C.

Which statement best describes the formula equation Cl2(g) + 2KBr(aq)→2KCl(aq)+ Br2(l)?

Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.

Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?

D.

Which chemical equation is unbalanced?

Sr + O2→2SrO

Which word equation shows hydrogen reacting with oxygen to form water?

hydrogen + oxygen→water

Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction?

isopropanol + oxygen carbon→dioxide + water + heat

According to the law of conservation of, the number of atoms in the products of a chemical reaction must be balanced with the number of atoms in the reactants.

mass

The compound CO2 is made of

one atom of carbon and two atoms of oxygen.

The compound FeCl3 is made of

one atom of iron and three atoms of chlorine.