Marking Period 4, Chem Quarterly

When the equation below is balanced using the smallest whole number coefficients, the coefficient of the O2 is ______ ______ NH3 (aq) + ______ O2 (g) --> ______ HNO3 (aq) + ______ H2O (l)

2

Which group of coefficients balances the following chemical equation? ______ NO + 2CO --> ______ Co2 + N2

2, 2

Which of the following represents a synthesis reaction?

2H2 + O2 --> 2H2O

Which of the following is a sign of a chemical reaction

A gas is released from a liquid

Which of the following does not involve chemical reactions?

A pond freezes over in the winter

What does the symbol NaCl (aq) mean

A water-based solution of sodium chloride

Which of the following is NOT a decomposition reaction?

Al (s) + HCl (aq) --> AlCl3 (aq) + H2 (g)

A reaction can include

All of the above

Chemical changes include ______

All of the above

Chemical equations have:

All of the above

Signs that a chemical change has occurred include

All of the above

What will be the product(s) for the combustion reaction of methanol?

All of the above

Which of the following is a sign that a chemical change has occurred

All of the above

Which of the following is/are required for a combustion reaction to take place

All of the above

At least one of the products of a double-replacement reaction is a ______

Any of the above

What is/are the product(s) of a complete combustion reaction?

Both A and B (water and carbon dioxide)

Methane + Oxygen --> Carbon dioxide + Water Which of the following chemical reactions correctly interprets the chemical word equation above?

CH4 + 2O2 --> CO2 + 2H2O

Which of the following is NOT a combination reaction?

CH4 + O2 --> CO2 + H2O

Formation of a precipitate in a chemical reaction is considered a:

Chemical change

The ______ indicate the mole ratios of each substance involved in the reaction

Coefficients

2AgNO3 (aq) + K2CrO4 (aq) --> 2KNO3 (aq) + Ag2CrO4 (s) The reaction above is classified as

Double displacement

All changes in matter are the result of chemical reactions

False

Dissolving salt in water is an example of chemical change

False

Endothermic reactions release more energy than they use. Exothermic reactions use more energy than they release

False

True of False: C + O2 --> CO2 In the chemical reaction above, the coefficient of oxygen is 2

False

True or False: If no products are newly formed in a process, no chemical change occurred and the substances involved in the process have no chemical properties

False

Hydrogen + Copper oxide --> Copper + Water Which of the following chemical reactions correctly interprets the chemical word equation above?

H2 (g) + CuO (s) --> Cu (s) + H2O (l)

What type of substances generally undergoes double-replacement reactions?

Ionic compounds in aqueous solution

Equations must be balanced in order to satisfy what law?

Law of conservation of mass

Which verb describes a process that is NOT indicative of a chemical change?

Melt

In most single-replacement reactions, a metal atom replaces a ______ atom in a compound, while a nonmetal atom replaces a ______ atom in a compound

Metal; nonmetal

When water freezes, it changes to ice. Is this a chemical reaction?

No

S + O2 --> SO2 The reaction above is classified as ______

Synthesis

Which of the following is/are true

Tarnishing of silver is a chemical change

What is indicated by a letter in parentheses after a chemical formula, such as (s)?

The physical state of the substances

A chemical equation is balanced when

The same number of each type of atom appears on both sides of the arrow

Can you tell whether a change in matter is caused by a chemical reaction?

Yes

Which of the following is not a double-replacement reaction

Zn + Cu(CH3COO)2 --> Zn(CH3COO)2 + Cu

Which of the following is NOT a single-replacement reaction?

Zn(NO3)2 + NaOH --> NaNO3 + Zn(OH)2

Which of the following diagrams represents a single displacement reaction?

green/pink + blue --> pink/blue + green

"Sodium metal reacts with chlorine gas to produce solid sodium chloride" Which chemical equation correctly translates the description above?

2Na (s) + Cl2 (g) --> 2NaCl (s)

Which of the following chemical equations is balanced?

4Fe + 3O2 --> 2Fe2O3

"Solid carbon reacts with oxygen gas to produce carbon dioxide gas" Which chemical equation correctly translates the description above?

C (s) + O2 (g) --> CO2 (g)

"Carbon dioxide gas reacts with liquid water to produce aqueous carbolic acid" Which chemical equation correctly translates the description above?

CO2 (g) + H2O (l) --> H2CO3 (aq)

The process of burning a fossil fuel to release energy is called ______

Combustion

Which type of reaction is represented by the following chemical equation? CH4 + 2O2 --> CO2 + 2H2O

Combustion reaction

What must be a reactant of a chemical reaction to qualify as combustion

Oxygen

Br2 (l) + 2Nal (s) --> 2NaBr (s) + I2 (s) The reaction above is classified as

Single displacement

Ca (s) + 2HNO2 (aq) --> Ca(NO2)2 (aq) + H2 (g) What type of chemical reactions is the chemical reaction described above

Single displacement

Mg + 2HCl --> MgCl2 + H2 The reaction above is classified as

Single displacement

Tin metal reacts with hydrochloric acid. Which is the correct balanced equation?

Sn (s) + 2HCl (aq) --> SnCl2 (aq) + H2 (g)

In the formation of sodium chloride by the combination of sodium and chlorine:

Sodium loses electrons but chlorine gains electrons

A chemical reaction changes some substances into other substances into other substances with different chemical properties

True

A chemical reaction changes some substances into other substances with different chemical properties

True

A combination reaction is also known as a synthesis reaction

True

For any decomposition reaction, there is only one reactant

True

In all single replacement reactions, the reactants include on element and one compound, and the products include one elements and one compound

True

In any chemical change, matter changes into an entirely different substance with different chemical properties

True

Ionic reactions take place mainly in solution

True

Measurement of a physical property does not change the identity of the substance; however, measurement of a chemical property occurs as the identity of the substance changes

True

Once the formulas for the reactants and the products are determined, the subscripts may not be changed

True

Rust forms when iron is exposed to water and oxygen

True

The release of gas bubbles is a sign of a chemical reaction

True

The solid lumps in cottage cheese are an example of a precipitate

True

The substances involved in a chemical reaction may be elements or compounds

True

The substances that form in a chemical reaction are completely different from the substances that start the reaction

True

Two compounds reacting to form another compound can qualify as a combination reaction

True

Signs that a chemical reaction has occurred include a change in

Two of the above