Chemistry Final Exam Review CH.8

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In a chemical reaction

the mass of the reactants equals the mass of the products

When a solid produced by a chemical reaction separates fro the solution it is called a

precipitate

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

H2

A chemical equation is balanced when the

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

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

NaOH

Which word equation represents the reaction that produces water from hydrogen and oxygen?

hydrogen plus oxygen yields water

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

(aq).

a chemical forrmula wirrten over the arrow in a chemical equation signifies

a catalyst for the reaction

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

9

Which coefficients correctly balance the formula equation NH4No2(s) yields N2(g) + H20(l)?

1,1,2

The complete balanced equation for the reaction between zing hydroxide and acetic acid is

Zn(OH)2 + 2CH3COOH yields Zn(CH3COO)2 +2H20

Which equation is not balanced?

2H2 + O2 yields H2O

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

synthesis reaction

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

single-displacement reaction

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

decomposition reaction

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

double-displacement reaction

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

decomposition reaction

The reaction represented by the equation Cl2(g) + 2KBr(aq) yields 2KCl(aq) + Br2(l) is

single-displacement reaction

In one type of synthesis reaction, an element combines with oxygen to yield an

oxide

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

carbon oxide

Oxides of active metals, such as CaO, react to form a

salt

When a binary compound decomposes, what is produced?

Two elements

When a binary compound decomposes, what is produced?

Two elements.

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

oxygen

Some acids, such as carbonic acid, decompose to nonmetal oxides and

water

When heated, metallic chlorates decompose into

metallic chlorides and oxygen

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

water

When potassium reacts with water, one product formed is

hydrogen gas

Predict the product of the reaction represented by the following equation: MgO +CO2

MgO+CO3

Magnesium hydroxide decomposes to yield magnesium oxide and

water

When sodium chlorate, NaClO3, decomposes, the products are

sodium chloride and oxygen

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

fluorine

The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are

Na2So4 and H2O

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

2Al + 3CuSo4 yields Al2(SO)4 + 3 Cu

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

activity

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

Predict what happens when zinc is added to water

no reaction occurs

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

no reaction occurs

Magnesium Bromide(aq) +chlorine(g) yields

MgCl2(aq) and Br2(l).

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