Chapter 8 - Chemical Equations and Reactions

In an equation, the symbol for a substance in water solution is followed by...

(aq)

Which coefficients correctly balance the formula equation CaO+H₂O→Ca(OH)₂?

1,1,1

What is the small whole number that appears in front of a formula in a chemical equation?

Coefficient

To balance a chemical equation, it may be necessary to adjust the...

Coefficients

The equation AX+BY→AY+BX is the general equation for a...

Double-displacement reaction

What is the balanced equation for the combustion of sulfur?

S(s)+O₂(g)→SO₂(g)

What is an example of a reaction that does not occur?

2HF(aq)+Cl₂(g)→F₂(g)+2HCl(aq)

When the equation Fe₃O₄+Al→Al₂O₃+Fe is correctly balanced, what is the coefficient of Fe?

9

In the equation 2Al(s)+3Fe(NO₃)₂(aq)→3Fe(s)+2Al(NO₃)₃(aq), iron has been replaced by...

Aluminum

Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?

C+O₂→CO₂

Which observation does not indicate that a chemical reaction has occurred?

Change in total mass of substances

In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is...

H₂

A precipitate may form in a double-displacement reaction when...

Positive ions combine with negative ions.

An active metal and a halogen react to form a...

Salt

The equation A+BX→AX+B is the general equation for a...

Single-displacement reaction

The reaction represented by the equation Mg(s)+2HCl(aq)→H₂(g)+MgCl₂ is a...

Single-displacement reaction

The equation A+X→AX is the general equation for a...

Synthesis reaction

The reaction represented by the equation 2Mg(s)+O₂(g)→2MgO(s) is a...

Synthesis reaction

When a binary compound decomposes, what is produced?

Two elements

In a chemical reaction...

the mass of the reactants equals the mass of the products.