Question 1

In general, fast reactions

Accepted Answer

A)  are exothermic. 
B)  are endothermic. 
C)  have low activation energies. 
D)  have high activation energies. 
A)  are exothermic. 
B)  are endothermic. 
C)  have low activation energies. 
D)  have high activation energies.

Question 2

The equation 4H2O2 $\to$ 4H2O + 2O2 is not appropriately written because

Accepted Answer

A)  oxygen is not diatomic. 
B)  fractional coefficients are not generally used. 
C)  the number of atoms of each element on each side is not the same. 
D)  the simplest set of coefficients has not been used. 
A)  oxygen is not diatomic. 
B)  fractional coefficients are not generally used. 
C)  the number of atoms of each element on each side is not the same. 
D)  the simplest set of coefficients has not been used.

Question 3

How many moles would 44 g of carbon dioxide, CO2, be?

Accepted Answer

A)  3.0 
B)  2.0 
C)  1.0 
D)  None of these 
A)  3.0 
B)  2.0 
C)  1.0 
D)  None of these

Question 4

For an exothermic reaction, the energy barrier is ______________ on the reactant side than on the product side.

Accepted Answer

A)  smaller 
B)  not different in size 
C)  greater 
A)  smaller 
B)  not different in size 
C)  greater

Question 5

Avogadro's number has a numerical value of

Accepted Answer

A)  6.02 $\times$ 1023. 
B)  1.00 $\times$ 1023. 
C)  3.01 $\times$ 1023. 
D)  none of these. 
A)  6.02 $\times$ 1023. 
B)  1.00 $\times$ 1023. 
C)  3.01 $\times$ 1023. 
D)  none of these.

Question 6

Balance the chemical equation: Bi2S3+ O2 $\to$Bi2O3 + SO2

Accepted Answer

2Bi<sub>2</sub>S<sub

Question 7

Which of the following compounds would you expect to be soluble in water?

Accepted Answer

A)  PbCO3 
B)  Ag2CO3 
C)  CuCO3 
D)  K2CO3 
A)  PbCO3 
B)  Ag2CO3 
C)  CuCO3 
D)  K2CO3

Question 8

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, ______________, and a salt.

Accepted Answer

The answer of When an acid reacts with a carbonate...

Question 9

The equation H2O2 $\to$  H2O + O is not correctly written because

Accepted Answer

A)  the number of atoms of each element on each side is not the same. 
B)  the mass indicated on each side is not the same. 
C)  oxygen is diatomic. 
D)  hydrogen peroxide decomposes to H2O and H. 
A)  the number of atoms of each element on each side is not the same. 
B)  the mass indicated on each side is not the same. 
C)  oxygen is diatomic. 
D)  hydrogen peroxide decomposes to H2O and H.

Question 10

A chemical reaction is at equilibrium when

Accepted Answer

A)  no reactants are changing to products. 
B)  the forward and reverse reactions proceed at the same rate. 
C)  the total mass has become constant. 
D)  the temperature is no longer changing. 
A)  no reactants are changing to products. 
B)  the forward and reverse reactions proceed at the same rate. 
C)  the total mass has become constant. 
D)  the temperature is no longer changing.

Question 11

When the equation Ca + H3PO4 $\to$ Ca3(PO4)2 + H2 is balanced, the sum of all the coefficients (both written and "understood") is ______________.

Accepted Answer

9 (coeffic

Question 12

When an acid reacts with a base, the products are ______________ and a salt.

Accepted Answer

The answer of When an acid reacts with a base,...

Question 13

According to the Arrhenius theory, basic properties are caused by ______________ ions.

Accepted Answer

The answer of According to the Arrhenius theory, basic properties...

Question 14

Which of the following is a weak base?

Accepted Answer

A)  NH3 
B)  NaOH 
C)  KOH 
D)  Ca(OH)2 
A)  NH3 
B)  NaOH 
C)  KOH 
D)  Ca(OH)2

Question 15

The human body contains thousands of catalysts called ______________.

Accepted Answer

The answer of The human body contains thousands of catalysts...

Question 16

A solution of pH 5 is ______________ times as acidic as a solution of pH 6.

Accepted Answer

The answer of A solution of pH 5 is ______________...

Question 17

A neutral aqueous solution has a pH of ______________.

Accepted Answer

The answer of A neutral aqueous solution has a pH...

Question 18

The original substances in a chemical reaction are called the ______________.

Accepted Answer

The answer of The original substances in a chemical reaction...

Question 19

When an element is oxidized, it ______________ electrons.

Accepted Answer

The answer of When an element is oxidized, it ______________...

Question 20

Which scientist first postulated the existence of ions?

Accepted Answer

A)  Lewis 
B)  Dalton 
C)  Arrhenius 
D)  Berzelius 
A)  Lewis 
B)  Dalton 
C)  Arrhenius 
D)  Berzelius

In general, fast reactions

The equation 4H₂O₂ $\to$ 4H₂O + 2O₂ is not appropriately written because

How many moles would 44 g of carbon dioxide, CO₂, be?

For an exothermic reaction, the energy barrier is ______________ on the reactant side than on the product side.

Avogadro's number has a numerical value of

Balance the chemical equation: Bi₂S₃+ O₂ $\to$ Bi₂O₃ + SO₂

Which of the following compounds would you expect to be soluble in water?

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, ______________, and a salt.

The equation H₂O₂ $\to$ H₂O + O is not correctly written because

A chemical reaction is at equilibrium when

When the equation Ca + H₃PO₄ $\to$ Ca₃(PO₄)₂ + H₂ is balanced, the sum of all the coefficients (both written and "understood") is ______________.

When an acid reacts with a base, the products are ______________ and a salt.

According to the Arrhenius theory, basic properties are caused by ______________ ions.

Which of the following is a weak base?

The human body contains thousands of catalysts called ______________.

A solution of pH 5 is ______________ times as acidic as a solution of pH 6.

A neutral aqueous solution has a pH of ______________.

The original substances in a chemical reaction are called the ______________.

When an element is oxidized, it ______________ electrons.

Which scientist first postulated the existence of ions?

Temperature and Heat

Waves and Sound

Optics and Wave Effects

Electricity and Magnetism

Atomic Physics

Nuclear Physics

The Chemical Elements

Chemical Bonding

Chemical Reactions

Organic Chemistry

Place and Time

Moons and Small Solar System Bodies

The Universe

The Atmosphere

Atmospheric Effects

Structural Geology and Plate Tectonics

Minerals Rocks and Volcanoes

Surface Processes

Geologic Time

Filters

Exam 13: The Solar System

In general, fast reactions

The equation 4H2O2 →\to→ 4H2O + 2O2 is not appropriately written because

How many moles would 44 g of carbon dioxide, CO2, be?

For an exothermic reaction, the energy barrier is ______________ on the reactant side than on the product side.

Avogadro's number has a numerical value of

Balance the chemical equation: Bi2S3+ O2 →\to→ Bi2O3 + SO2

Which of the following compounds would you expect to be soluble in water?

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, ______________, and a salt.

The equation H2O2 →\to→ H2O + O is not correctly written because

A chemical reaction is at equilibrium when

When the equation Ca + H3PO4 →\to→ Ca3(PO4)2 + H2 is balanced, the sum of all the coefficients (both written and "understood") is ______________.

When an acid reacts with a base, the products are ______________ and a salt.

According to the Arrhenius theory, basic properties are caused by ______________ ions.

Which of the following is a weak base?

The human body contains thousands of catalysts called ______________.

A solution of pH 5 is ______________ times as acidic as a solution of pH 6.

A neutral aqueous solution has a pH of ______________.

The original substances in a chemical reaction are called the ______________.

When an element is oxidized, it ______________ electrons.

Which scientist first postulated the existence of ions?

Temperature and Heat

Waves and Sound

Optics and Wave Effects

Electricity and Magnetism

Atomic Physics

Nuclear Physics

The Chemical Elements

Chemical Bonding

Chemical Reactions

Organic Chemistry

Place and Time

Moons and Small Solar System Bodies

The Universe

The Atmosphere

Atmospheric Effects

Structural Geology and Plate Tectonics

Minerals Rocks and Volcanoes

Surface Processes

Geologic Time

Filters

The equation 4H₂O₂ $\to$ 4H₂O + 2O₂ is not appropriately written because

How many moles would 44 g of carbon dioxide, CO₂, be?

Balance the chemical equation: Bi₂S₃+ O₂ $\to$ Bi₂O₃ + SO₂

The equation H₂O₂ $\to$ H₂O + O is not correctly written because

When the equation Ca + H₃PO₄ $\to$ Ca₃(PO₄)₂ + H₂ is balanced, the sum of all the coefficients (both written and "understood") is ______________.