Unit 7 - Chemical Reactions Test

25 Questions | By Haszshe | Last updated: Aug 21, 2017

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Unit 7 - Chemical Reactions Test

In this scientific quiz, we’ll be putting you up against a gauntlet of questions regarding chemical reactions – the process of transformation from one set of chemical substances to another. Think you have the right brain chemistry for the task?

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Questions and Answers

1.

Substances that prevent certain chemical reactions are called _____.
- A.
  
  Endothermics
- B.
  
  Catalyst
- C.
  
  Inhibitors
- D.
  
  Products
2.

When one element replaces another element in a compound, the reaction is a ____ reaction.
- A.
  
  Synthesis
- B.
  
  Single-displacement
- C.
  
  Decomposition
- D.
  
  Double-displacement
3.

Each substance to the right of the arrow in a chemical equation is a _____.
- A.
  
  Catalyst
- B.
  
  Precipitate
- C.
  
  Reactant
- D.
  
  Product
4.

A chemical reaction in which the energy released is primarily in the form of heat is ____.
- A.
  
  Flammable
- B.
  
  Exothermic
- C.
  
  Endothermic
- D.
  
  Endergonic
5.

A substance that speeds up a chemical reaction without undergoing a permanent change itself is a(n) _____.
- A.
  
  Inhibitor
- B.
  
  Coeffient
- C.
  
  Reactant
- D.
  
  Catalyst
6.

Numbers that precede symbols and formulas in a chemical equation are called ____.
- A.
  
  Subscripts
- B.
  
  Superscripts
- C.
  
  Fractions
- D.
  
  Coeffients
7.

A chemical reaction in which two or more substances combine to form another substance is a _____ reaction.
- A.
  
  Synthesis
- B.
  
  Decomposition
- C.
  
  Reactant
- D.
  
  Product
8.

The breaking down of a substance into two or more substances is ______.
- A.
  
  Displacement
- B.
  
  Synthesis
- C.
  
  Decomposition
- D.
  
  Endothermic
9.

Each substance on the left side of the arrow in a chemical equation is a ______.
- A.
  
  Reactant
- B.
  
  Product
- C.
  
  Coefficient
- D.
  
  Catalyst
10.

If energy in the form of heat is required for a chemical reaction to take place, the reaction is ______.
- A.
  
  Exothermic
- B.
  
  Reactant
- C.
  
  Balanced
- D.
  
  Endothermic
11.

Accoriding to the law of conservation of mass, how does the mass of the products in a chemical reaction compare with the mass of the reactants?
- A.
  
  The mass of the products is greater.
- B.
  
  The mass of the reactants is greater.
- C.
  
  There is no relationship.
- D.
  
  The masses are equal.
12.

Which of the following could represent a single-displacement reaction?
- A.
  
  Element + element = compound
- B.
  
  Compound = element + element
- C.
  
  Element + compound = element + compound
- D.
  
  Compound + compound = compound + compound
13.

A(n) _____ chemical equation has the same number of atoms of each element on both sides of the equation.
- A.
  
  Simple
- B.
  
  Balanced
- C.
  
  Unbalanced
- D.
  
  Complex
14.

According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?
- A.
  
  2
- B.
  
  0
- C.
  
  1
- D.
  
  4
15.

What is an insoluble solid that forms as the result of a double-displacement reaction called?
- A.
  
  A precipitate
- B.
  
  An inhibitor
- C.
  
  A coefficient
- D.
  
  A catalyst
16.

What information is useful for predicting whether metal will replace another metal in a compound?
- A.
  
  A coefficient
- B.
  
  A subscript
- C.
  
  An activity series
- D.
  
  Atomic mass values
17.

An example of a balanced chemical equation is _______.
- A.
  
  AgNO3 + NaCl 4AgCl + 2NaNO3
- B.
  
  2AgNO3 + 2NaCl 3AgCl + 2NaNO3
- C.
  
  AgNO3 + NaCl AgCl + NaNO3
- D.
  
  AgNO3 + 2NaCl + AgCl AgCl + 3NaNO3
18.

What type of reaction is shown in the chemical equation NH3 + HCl NH4Cl?
- A.
  
  Synthesis
- B.
  
  Decomposition
- C.
  
  Single-displacement
- D.
  
  Double-displacement
19.

What type of chemical reaction is shown in the equation 2H2O 2H2 + O2?
- A.
  
  Synthesis
- B.
  
  Decomposition
- C.
  
  Single-displacement
- D.
  
  Double-displacement
20.

Study the following equation and choose the term that correctly describes the part identified. The big 2 in “2H₂O” is a:
- A.
  
  Coefficient
- B.
  
  Reactants
- C.
  
  Products
- D.
  
  Subscript
21.

Study the following equation and choose the term that correctly describes the part identified. The left side of the equation:
- A.
  
  Coefficient
- B.
  
  Reactants
- C.
  
  Products
- D.
  
  Subscript
22.

Study the following equation and choose the term that correctly describes the part identified. The right side of the equation:
- A.
  
  Coefficient
- B.
  
  Reactants
- C.
  
  Products
- D.
  
  Subscript
23.

Study the following equation and choose the term that correctly describes the part identified. The small 2 in “2H₂O” is a:
- A.
  
  Coefficient
- B.
  
  Reactants
- C.
  
  Products
- D.
  
  Subscript
24.

Balance the following equation:
- A.
  
  3, 1, 3, 1
- B.
  
  3, 3, 2, 3
- C.
  
  3, 2, 3, 1
- D.
  
  1, 2, 1, 2

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