Chemical Reactions Pre-assessment

14 Questions | By Jkrug | Updated: Mar 9, 2013 | Attempts: 209

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1.

Chemical reactions
- A.
  
  Occur only in living organisms.
- B.
  
  Create and destroy atoms.
- C.
  
  Only occur outside living organisms.
- D.
  
  Produce new substances.
Correct Answer
D. Produce new substances.
2.

A net ionic equation
- A.
  
  Shows the spectator ions.
- B.
  
  Shows only those particles involved in the reaction.
- C.
  
  Is not necessarily balanced with respect to mass or charge.
- D.
  
  Shows dissolved ionic compounds as dissociated free ions.
Correct Answer
B. Shows only those particles involved in the reaction.
3.

What does the triangle symbol above the arrow in a chemical equation mean?
- A.
  
  Heat is supplied to the reaction.
- B.
  
  A catalyst is needed in the reaction.
- C.
  
  Electricity is need in the reaction.
- D.
  
  A precipitate will form during the reaction.
Correct Answer
A. Heat is supplied to the reaction.
4.

Which of the following combinations of symbol and explanation of symbol is correct when used in a chemical equation?
- A.
  
  (g), grams
- B.
  
  (l), liters
- C.
  
  (aq), dissolved in water
- D.
  
  (s), solid product
Correct Answer
C. (aq), dissolved in water
5.

In the chemical equation H2O2 à H2O + O2f the O2 is a ____.
- A.
 
 Catalyst
- B.
 
 Solid
- C.
 
 Product
- D.
 
 Reactant
Correct Answer
C. Product
6.

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
- A.
  
  P (s) + O2(g) -->P O2 (g)
- B.
  
  P(s) + O2(g) --> P5 O2 (g)
- C.
  
  P(s) + O2(g) -->P2 O5 (s)
- D.
  
  P2 O5 (s) --> P2 (s) + O2 (g)
Correct Answer
C. P(s) + O2(g) -->P2 O5 (s)
7.

When the equation Fe + Cl₂ à FeCl₃ is balanced, what is the coefficient for Cl?
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
Correct Answer
C. 3
8.

When the following equation is balanced, what is the coefficient for HCl? Mg(s) + HCl (aq) à MgCl₂(aq) + H₂ (g)
- A.
  
  6
- B.
  
  3
- C.
  
  1
- D.
  
  2
Correct Answer
D. 2
9.

Which of the following statements is true about what happens in all chemical reactions?
- A.
  
  The ways in which atoms are joined together is not changed.
- B.
  
  New atoms are formed as products.
- C.
  
  The final substances are called reactants.
- D.
  
  Bonds between atoms are broken and new bonds are formed.
Correct Answer
D. Bonds between atoms are broken and new bonds are formed.
10.

When the equation KClO₃ (s) à KCl (s) + O₂ (g) is balanced, the coefficient of KClO₃ is
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
Correct Answer
B. 2
11.

In a combustion reaction, one of the reactants is
- A.
  
  Hydrogen
- B.
  
  Nitrogen
- C.
  
  Oxygen
- D.
  
  Metal
Correct Answer
C. Oxygen
12.

The reaction 2Fe + 3Cl2 --> 2FeCl3 is an example of which type of reaction?
- A.
  
  Combustion reaction
- B.
  
  Single-replacement reaction
- C.
  
  Combination reaction
- D.
  
  Decomposition reaction
Correct Answer
C. Combination reaction
13.

The equation Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) is an example of which type of reaction?
- A.
  
  Combination reaction
- B.
  
  Single-replacement reaction
- C.
  
  Decomposition reaction
- D.
  
  Double-replacement reaction
Correct Answer
B. Single-replacement reaction
14.

The equation H3PO4 + 3KOH --> K3PO3 + 3H2O is an example of which type of reaction?
- A.
  
  Double-replacement reaction
- B.
  
  Combination reaction
- C.
  
  Decomposition reaction
- D.
  
  Single-replacement reaction
Correct Answer
A. Double-replacement reaction

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Mar 09, 2013

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Feb 21, 2013

Quiz Created by
Jkrug

Chemical Reactions Pre-assessment

Chemical reactions

A net ionic equation

What does the triangle symbol above the arrow in a chemical equation mean?

Which of the following combinations of symbol and explanation of symbol is correct when used in a chemical equation?

In the chemical equation H<sub>2</sub>O<sub>2</sub> à H<sub>2</sub>O + O<sub>2</sub>f the O<sub>2</sub> is a ____.

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?

When the equation Fe + Cl2 à FeCl3 is balanced, what is the coefficient for Cl ?

When the following equation is balanced, what is the coefficient for HCl? Mg(s) + HCl (aq) à MgCl2 (aq) + H2 (g)

Which of the following statements is true about what happens in all chemical reactions?

When the equation KClO3 (s) à KCl (s) + O2 (g) is balanced, the coefficient of KClO3 is

In a combustion reaction, one of the reactants is

The reaction 2Fe + 3Cl2 --> 2FeCl3 is an example of which type of reaction?

The equation Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) is an example of which type of reaction?

The equation H3PO4 + 3KOH --> K3PO3 + 3H2O is an example of which type of reaction?

When the equation Fe + Cl₂ à FeCl₃ is balanced, what is the coefficient for Cl?

When the following equation is balanced, what is the coefficient for HCl? Mg(s) + HCl (aq) à MgCl₂(aq) + H₂ (g)

When the equation KClO₃ (s) à KCl (s) + O₂ (g) is balanced, the coefficient of KClO₃ is