Question 1

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

Accepted Answer

9 (coeffic

Question 2

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

Question 3

In the reaction between HCl and Na2CO3,which gas is formed?

Accepted Answer

A)  H2 
B)  CH4 
C)  CO2 
D)  O2 
A)  H2 
B)  CH4 
C)  CO2 
D)  O2

Question 4

Complete and balance the equation: Mg + HC2H3O2 ? _____________________

Accepted Answer

Mg + 2HC₂H₃O

Question 5

Which type of reaction is 2Cu(NO3)2→ 2CuO + 4NO2 + O2?

Accepted Answer

A)  Single-replacement 
B)  Double-replacement 
C)  Combination 
D)  Decomposition 
A)  Single-replacement 
B)  Double-replacement 
C)  Combination 
D)  Decomposition

Question 6

Complete and balance the equation: Al + HCl ? ____________________

Accepted Answer

2Al + 6HCl

Question 7

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

Accepted Answer

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

Question 8

A solution with a pH of 8 is

Accepted Answer

A)  strongly acidic. 
B)  weakly basic. 
C)  strongly basic. 
D)  weakly acidic. 
A)  strongly acidic. 
B)  weakly basic. 
C)  strongly basic. 
D)  weakly acidic.

Question 9

The coefficients needed to balance the equation Ga + Br2 → GaBr3 are,respectively,

Accepted Answer

A)  4, 3, and 2. 
B)  2, 3, and 2. 
C)  1, 3, and 2. 
D)  2, 1, and 2. 
A)  4, 3, and 2. 
B)  2, 3, and 2. 
C)  1, 3, and 2. 
D)  2, 1, and 2.

Question 10

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

Accepted Answer

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

Question 11

When the equation NH4NO3→ N2O + H2O is balanced,the coefficient of N2O is

Accepted Answer

A)  3. 
B)  4. 
C)  2. 
D)  1. 
A)  3. 
B)  4. 
C)  2. 
D)  1.

Question 12

Hydrogen gas would be a product of the reaction of

Accepted Answer

A)  vinegar and baking soda. 
B)  iron and hydrochloric acid. 
C)  oxygen and methane. 
D)  HCl and NaOH. 
A)  vinegar and baking soda. 
B)  iron and hydrochloric acid. 
C)  oxygen and methane. 
D)  HCl and NaOH.

Question 13

One reactant of photosynthesis is

Accepted Answer

A)  hydrogen. 
B)  oxygen. 
C)  carbon dioxide. 
D)  methane. 
A)  hydrogen. 
B)  oxygen. 
C)  carbon dioxide. 
D)  methane.

Question 14

The process of melting lead is an example of

Accepted Answer

A)  a physical change. 
B)  a chemical change. 
C)  a physical property. 
D)  a chemical property. 
A)  a physical change. 
B)  a chemical change. 
C)  a physical property. 
D)  a chemical property.

Question 15

Which acid is present in vinegar?

Accepted Answer

A)  HCl 
B)  H3PO4 
C)  H2SO4 
D)  HC2H3O2 
A)  HCl 
B)  H3PO4 
C)  H2SO4 
D)  HC2H3O2

Question 16

When the equation Al + O2→ Al2O3 is balanced,the coefficient of Al is

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 17

What is the identity of stomach acid?

Accepted Answer

A)  HC2H3O2 
B)  H2CO3 
C)  HCl 
D)  H3PO4 
A)  HC2H3O2 
B)  H2CO3 
C)  HCl 
D)  H3PO4

Question 18

Most ______________ do their jobs by decreasing the activation energy for a reaction.

Accepted Answer

The answer of Most ______________ do their jobs by decreasing...

Question 19

Balance the chemical equation: Al2S3+ H2O ? Al(OH)3 + H2S

Accepted Answer

Al₂S₃ + 6H₂O@#LAT-DLM&2

Question 20

Complete and balance the following equations:
a. HNO3 + Ba(OH)2 ? ____________________.
b. H3PO4 + CaCO3 ? _____________________.

Accepted Answer

a.2HNO₃ + B

Exam 13: Chemical Reactions

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

Which scientist first postulated the existence of ions?

In the reaction between HCl and Na2CO3,which gas is formed?

Complete and balance the equation: Mg + HC2H3O2 ? _____________________

Which type of reaction is 2Cu(NO3)2→ 2CuO + 4NO2 + O2?

Complete and balance the equation: Al + HCl ? ____________________

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

A solution with a pH of 8 is

The coefficients needed to balance the equation Ga + Br2 → GaBr3 are,respectively,

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

When the equation NH4NO3→ N2O + H2O is balanced,the coefficient of N2O is

Hydrogen gas would be a product of the reaction of

One reactant of photosynthesis is

The process of melting lead is an example of

Which acid is present in vinegar?

When the equation Al + O2→ Al2O3 is balanced,the coefficient of Al is

What is the identity of stomach acid?

Most ______________ do their jobs by decreasing the activation energy for a reaction.

Balance the chemical equation: Al2S3+ H2O ? Al(OH)3 + H2S

Complete and balance the following equations: a. HNO3 + Ba(OH)2 ? ____________________. b. H3PO4 + CaCO3 ? _____________________.

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

In the reaction between HCl and Na₂CO₃,which gas is formed?

Complete and balance the equation: Mg + HC₂H₃O₂ ? _____________________

Which type of reaction is 2Cu(NO₃)₂→ 2CuO + 4NO₂ + O₂?

The coefficients needed to balance the equation Ga + Br₂ → GaBr₃ are,respectively,

When the equation NH₄NO₃→ N₂O + H₂O is balanced,the coefficient of N₂O is

When the equation Al + O₂→ Al₂O₃ is balanced,the coefficient of Al is

Balance the chemical equation: Al₂S₃+ H₂O ? Al(OH)₃ + H₂S

Complete and balance the following equations: a. HNO₃ + Ba(OH)₂ ? . b. H₃PO₄ + CaCO₃ ? _.