chemistry chapter 8

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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

Which coefficients correctly balance the formula equationNH4NO2(s)→ N2(g) + H2O(l)?

1,1,2

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

9

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

C +O2 = CO2

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

H2

Magnesium bromide (aq) + chlorine (g) yields

MgCl2(aq) and Br2(l)

in the word equation, sodium oxide + water → sodium hydroxide, the formula for

NaOH

What is the balanced equation for the combustion of sulfur?

S(s) + O2 (g) = SO2 (g)

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

a coefficient

when a solid produced by a chemical reaction separates from the solution it is called

a precipitate

The ability of an element to react is the element's

activity

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

activity series

according to the law of conservation of mass, the total mass of the reacting substances is

always equal to the total mass of products

An element in the activity series can replace any element

below it on the list

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

calcium chloride forms

The reaction of calcium oxide, CaO, with water yields

calcium hydroxide

When heated, a metal carbonate decomposes into a metal oxide and

carbon dioxide

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

change in total mass of substances

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

coefficients

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

decomposition reaction

The reaction represented by the equation 2HgO(s) → 2Hg(l) + O2(g) is a(n)

decomposition reaction

In what kind of reaction does a single compound produce two or more simpler substances?

decompostition reaction

In what kind of reaction does one element replace a similar element in a compound?

displacement reaction

In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds?

double-displacement reaction

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

double-displacement reaction

The reaction represented by the equation Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) is a

double-displacement reaction

The decomposition of a substance by an electric current is called

electrolysis

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

hydrogen

Group 1 metals react with water to produce metal hydroxides and

hydrogen

When potassium reacts with water, one product formed is

hydrogen gas

Predict what happens when lead is added to nitric acid.

hydrogen is released

Oxides of active metals, such as CaO, react with water to produce

metal hydroxides

Some metals, such as iron, react with steam to produce hydrogen gas and a

metal oxide

Predict what happens when zinc is added to water.

no reaction occurs

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(aq) is a

single-displacement reaction

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

synthesis reaction

The equation A + X → AX is the general equation for a(n)

synthesis reaction

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

synthesis reaction

in a chemical reaction

the mass of the reactants equals the mass of the products

What can be predicted by using an activity series?

whether a certain chemical reaction will occur


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