Chemistry Chapter 8 Review

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Magnesium hydroxide decomposes to yield magnesium oxide and

hydrogen

The word equation solid carbon + oxygen gas = carbox dioxide gas + energy represents a chemical reaction because

the reaction releases energy

The decomposition of a substance by an electric current is called

electrolysis

In the equation 2Al(s)+3Fe(N03)2(aq)=3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by

aluminum

In one type of synthesis reaction, an element combines with oxygen to yield a(n)

oxide

In a chemical reaction,

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

Predict what happens when magnesium metal is added to a solution of calcium chloride

NO REACTION OCCURS

Group 1 metals react with water to produce hydrogen and

metal hydroxides

If a certain metal is placed in an ionic solution containing another metal and no reaction occurs, then the solution is

higher on the activity series

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

4

Active metals react with certain acids, such as hydrochloric acid, to yield a metal compound and

hydrogen

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

Coefficient

What is the balanced equation when aluminum reacts with copper(II) sulfate?

2AL + 3CuSO4 = Al2(SO4)3+3Cu

When heated, metallic cholrates decompose into

metallic chlorides and oxygen

The reaction represented by the equation 2KClO3(s)=2KCl(s)+3O2(g) is a

decomposition reaction

After the first steps in writing an equation, the equation is balanced by

adjusting coefficients to the smallest whole-number ratio

If metal X is higher than metal Y in the activity series, then metal X

loses electrons more readily than does the metal Y

When a binary compound decomposes, what does it produce?

Two elements

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

C + O2 = CO2

Which coefficients correctly balance the formula equation NH4NO2(s) = N2(g) +H20(l)

112

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

Change in total mass of substances

An active metal and a halogen react to form a

salt

In a double-displacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is

water!

A chemical equation is balanced when the

same number of each kind of atom appears in the reactants and in the products

Which reaction can be predicted from the activity series?

2H20(aq) + 2Na(s) = 2NaOH(aq) +H2 (g)

Which reaction does not occur?

2HF(aq)+ Cl2(g) = F2(g) + 2HCl(aq)

The equation A + X = AX is the general equation for a

synthesis reaction

What can be predicted by using an activity series?

Whether a certain chemical reaction will occur

When sodium chlorate decomposes, the products are

sodium chloride and oxygen

An insoluble gas that forms in a double-displacement reaction in aqueous solution

bubbles out of solution

An element in the activity series can replace any element

below it on the list

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

synthesis reaction

The equation AX=A+X is the general equation for

decomposition reactions

Which equation is not balanced?

2H2+o2=H20

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

Activity series

In what kind of reaction do two or more substances combine to form a new compound?

Synthesis reaction

In the word equation, sodium oxide + water = sodium hydroxide, the formula for sodium hydroxide is represented by

NaOH

Calcium bromide (aq) + chlorine (g) yields

CaCl2(aq) and Br(2)

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

coefficients

If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be

fluorine

When heated, a metal carbonate decomposes itno carbon dioxide and

a metal oxide

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

H2

The equation of A+BX = AX+B is the general equation for a

single displacement reaction

Predict the product of the reaction represented by the following equation

MgCO3

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

double-displacement reaction

When a metal chlorate is heated, it decomposes to yield oxygen and

a metal chloride

The reaction represented by the equation Ca(s) + 2HCl(aq) = H2(g) + CaCl2(aq) is a

single displacement reaction

When potassium reacts with water, one product formed is

potassium hydroxide

Predict what happens when potassium is added to a solution of nickel chloride

Potassium chloride forms

In an equation, the symbol for a substance in gaseous form is followed by

(g)

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