chemistry march 16

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

1, 1, 2

Which set of coefficients will balance the equation below?NaOH + Cu(NO3)2 Cu(OH)2 + NaNO3

2, 1, 1, 2

Which equation is not balanced?

2H2 + O2 H2O

Which equation is not balanced?

2H2 + O2 ® H2O

which reaction does not occur

2HF(aq) + Cl2(g) ® F2(g) + 2HCl(aq)

What is the total number of molecules represented by the following equation?2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O(g)

33

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

9

Which of the following is a product in the reaction described by the word equation below?iron + copper(II) sulfate iron(II) sulfate + copper

Both (a) and (b)

In the reaction Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g), what element has been displaced?

H

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

H2.

Which of the following is true regarding the law of conservation of mass?

It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.

In the chemical equation 2Mg(s) + O2(g) ? 2MgO(s)

Mg represents the reagent magnesium.

Which of the following statements is a logical conclusion based on the experimental data?

Na(s) + H2O(l)

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

NaOH.

You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?

Solution A, solution B, and the mixture are all yellow

sing the activity series, determine which of the following reactions is possible.

Zinc must have a higher activity than cadmium.

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

Zn(OH)2 + 2CH3COOH ® Zn(CH3COO)2 + 2H2O.

A chemical formula written over the arrow in a chemical equation signifies

a catalyst for the reaction.

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

a coefficient

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

always equal to the total mass of the products.

In the activity series, the more active elements are found

at the top.

In a single-displacement reaction, an element in the activity series most likely can replace any element

below it on the list.

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

change in total mass of substances

To balance a chemical equation, it is permissible to adjust the

coefficients

The reaction 2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(l) is

combustion reaction.

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

decomposition reaction

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

decomposition reaction.

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

decomposition reaction.

Which statement is true regarding the reaction represented by the following equation?Zn(s) + CdCl2(aq) ZnCl2(aq) + Cd(s)

decomposition reaction.

In a chemical equation, the symbol (aq) indicates that the substance is

dissolved in water.

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

double-displacement reaction

In a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds. This reaction is called a

double-displacement reaction.

The coefficients in a chemical equation

indicate the number of moles of each substance that react.

The production of a slightly soluble solid compound in a double-displacement reaction results in the formation of a

precipitate.

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

single-displacement reacti

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

single-displacement reaction.

The reaction Mg(s) + 2HCl(aq) H2(g) + MgCl2(aq) is a

single-displacement reaction.

What type of chemical reaction is represented by the following word equation?iron + oxygen iron(II) oxide

synthesis

In a chemical reaction

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

The Greek letter delta (D) above the arrow in a chemical equation means

the reactants are heated.

sing the activity series, determine which of the following reactions is possible.

the unknown metal is higher on the activity series than zinc, but below sodium.

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

double-displacement reaction.

The reaction Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) is a

double-displacement reaction.

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

double-displacement reaction.

What is the total number of molecules that is represented by the following chemical equation?NH4NO2 N2 + 2H2O

4

Which of the following equations represents the balanced equation for the reaction of iron and oxygen?

4Fe 3O2 2Fe2O3

In the reaction described by the word equation sodium + water sodium hydroxide + hydrogen gas

Both (a) and (c)

Using the activity series, predict which of the following reactions can occur

Both (a) and (c)

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

C + O2 ® CO2

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

a precipitate.