Grade 8 Chapter 6 Physical Science

20 Questions | By Fzrinski | Updated: Mar 14, 2022 | Attempts: 101

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Grade 8 Chapter 6 Physical Science - Quiz

Chapter Six deals with Chemical Reactions

Questions and Answers

1.

Chemistry is...
- A.
  
  A characteristic of a substance that can be observed without changing the substance into another substance.
- B.
  
  The study of matter and how matter changes.
- C.
  
  Anything that has mass and takes up space.
- D.
  
  A rapid reaction between oxygen and a substance called a fuel.
2.

What type of reaction is FeS + 2HCl à Fe Cl₂ + H₂S?
- A.
  
  A synthesis reaction.
- B.
  
  A decomposition reaction
- C.
  
  A single displacement reaction
- D.
  
  A double displacement reaction
3.

Which of the following is NOT a correct inference that you can make about the burning of gasoline?
- A.
  
  Chemical bonds are broken and others are formed.
- B.
  
  The reaction is a physical change.
- C.
  
  New substances are produced.
- D.
  
  Energy is released.
4.

A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be...
- A.
  
  Balanced
- B.
  
  Unbalanced
- C.
  
  An incomplete reaction
- D.
  
  A replacement reaction
5.

Anything that has mass and takes up space is considered...
- A.
  
  Matter
- B.
  
  Energy
- C.
  
  Chemistry
- D.
  
  Endothermic
6.

What happens when chemical bonds break and new bonds form?
- A.
  
  A physical change.
- B.
  
  A chemical change.
- C.
  
  Matter is destroyed.
- D.
  
  Surface area increases
7.

CaCO₃represents a chemical ...
- A.
  
  Symbol.
- B.
  
  Formula.
- C.
  
  Subscript.
- D.
  
  Reaction.
8.

The only sure evidence for a chemical reaction is...
- A.
  
  The formation of a gas.
- B.
  
  A color change.
- C.
  
  The production of one or more new substances.
- D.
  
  Changes in properties.
9.

A shorter, easier way to show chemical reactions, using symbols instead of words, is called a...
- A.
  
  Chemical equation
- B.
  
  Chemical formula
- C.
  
  Symbol
- D.
  
  Subscript
10.

The substances listed on the left side of a chemical equation are the...
- A.
  
  Products
- B.
  
  Coefficients.
- C.
  
  Precipitates
- D.
  
  Reactants
11.

In chemical reactions, what does the principle of conservation of matter mean?
- A.
  
  Matter is not created or destroyed.
- B.
  
  The total mass of the reactants is greater than the total mass of the products.
- C.
  
  The total mass of the reactants is less than the total mass of the products.
- D.
  
  Matter is not changed.
12.

Which of the following is a balanced equation?
- A.
  
  H2O ---> H2O + O2
- B.
  
  2Fe2O3 + 3C --> 4Fe + 3CO2
- C.
  
  SO2 + O2 + 2H2O --> 4H2SO4
- D.
  
  2Mg + HCl --> MgCl2 + H2
13.

Which two processes could be considered opposites?
- A.
  
  A decomposition reaction and a single replacement reaction.
- B.
  
  A single replacement reaction and a double replacement reaction.
- C.
  
  A precipitate reaction and a synthesis reaction
- D.
  
  A synthesis reaction and a decomposition reaction
14.

A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a ....
- A.
  
  Synthesis reaction
- B.
  
  Decomposition reaction
- C.
  
  Replacement reaction
- D.
  
  Precipitate reaction
15.

A chemical reaction that absorbs energy in the form of heat is described as...
- A.
  
  Endothermic
- B.
  
  Exothermic
- C.
  
  Combustion
- D.
  
  Unbalanced
16.

Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide?
- A.
  
  2Na + O2 --- Na2O
- B.
  
  NOT THIS ONE
- C.
  
  NOT THIS ONE
- D.
  
  NOT THIS ONE
17.

When a chemical reaction takes place in an open system....
- A.
  
  Matter can enter from or escape to the surroundings.
- B.
  
  Matter is not allowed to enter from or escape to the surroundings.
- C.
  
  Matter can enter from the surroundings, but can not escape to the surroundings.
- D.
  
  Matter can not move at all.
18.

In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the...
- A.
  
  Number of atoms in each molecule in the reaction.
- B.
  
  Number of elements in the reaction.
- C.
  
  Number of molecules or atoms of each substance in the reaction.
- D.
  
  Number of molecules in each atom in the reaction.
19.

Chemicals that act as biological catalysts by speeding up reactions in living things are...
- A.
  
  Inhibitors
- B.
  
  Enzymes
- C.
  
  Fuels
- D.
  
  Reactants
20.

The number placed below an element's symbol in a chemical formula is called a....
- A.
  
  Subscript
- B.
  
  Coefficient
- C.
  
  Reactant
- D.
  
  Product