Grade 8 Chapter 6 Physical Science
Chapter Six deals with Chemical Reactions
- 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.CaCO3 represents 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
Questions: 12 | Attempts: 184 | Last updated: Jan 11, 2013
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