Unit 7 - Chemical Reactions Test

25 Questions | By Haszshe | Last updated: Aug 21, 2017 | Total Attempts: 175

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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?

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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