Writing and Balancing Chemical Equations Assignment and Quiz

Which equation has both a liquid and a gas as products?

2HgO(s) -> 2Hg(l) + O2(g)

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

4

Describe the chemical reaction based on the chemical equation below. Also, explain whether the equation is balanced. es002-1.jpg

Ammonia gas reacts with oxygen gas. Nitric oxide gas and liquid water are produced. Platinum is used as a catalyst. The equation is unbalanced because the number of hydrogen atoms is not the same on both sides of the equation.

Barium chlorate (Ba(ClO3)2) breaks down to form barium chloride and oxygen. What is the balanced equation for this reaction? When counting atoms in parentheses, multiply all subscripts by the number outside the parentheses to get the number of atoms.

Ba(ClO3)2(s) → BaCl2(s) + 3O2(g)

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?

Fg2(g) + Ca(s) -> triangle CaF2(s)

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?

H2SO4(aq) + 2NaOH(aq) -? Na2SO4(aq) + 2H2O(l)

Aqueous magnesium chloride and hydrogen gas are produced when solid magnesium reacts with aqueous hydrochloric acid (HCl). What is the equation for this reaction? Do not worry about balancing this equation.

Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)

Which formula equation shows a reversible reaction?

NH4Cl(s) -><- NH3(g) + HCl(g)

Sulfur trioxide is a gas that reacts with liquid water to produce aqueous sulfuric acid, or acid rain. What is the equation for this reaction? Do not worry about balancing the equation.

SO3(g) + H2O(l) → H2SO4(aq)

Which chemical equation is unbalanced?

Sr + O2 -> 2SrO

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

(aq)

Carbon dioxide and water are produced when pentane (C5H12) reacts with oxygen. What is the balanced equation for this reaction?

C5H12(g) +8O2(g) → 5CO2(g) + 6H2O(g)

Which of the following is the correct word equation for the reaction described below? Calcium hydroxide and hydrogen gas are produced by the reaction of calcium hydride and water.

calcium hydride + water → calcium hydroxide + hydrogen

Which of the following is the correct word equation for the reaction described below? Methanol (CH3OH) forms when carbon monoxide reacts with hydrogen.

carbon monoxide + hydrogen → methanol

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

Which of the following is the correct word equation for the reaction described below? Mercury(II) oxide breaks down when it is heated to form oxygen gas and liquid mercury.

mercury(II) oxide → oxygen + mercury

Which of the following is the correct word equation for the reaction described below? When sulfuric acid reacts with sodium hydroxide, sodium sulfate and water form.

sulfuric acid + sodium hydroxide → sodium sulfate + water

Identify the information that can be included in a chemical equation. Check all of the boxes that apply.

the states of the reactants and products the temperature and pressure at which the reaction was carried out the relative amounts of reactants and products the type of catalyst that is used to speed up the reaction whether the reaction can go in both directions