Chemical Reactions
8 minutes ago
tbeilke
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20 QuestionsShow answers
  • Question 1
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    Q. True or False
    In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
    answer choices
    true
    false
  • Question 2
    30 seconds
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    Q. A chemical change is different than a physical change because in a chemical change
    answer choices
    Chemicals are used
    Molecules do not physically touch
    A new substance is formed and in a physical change no new substance is formed
    The change can be seen but in a physical change it cannot
  • Question 3
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    Q. The left side of the equation below is called
    answer choices
    Products
    Reactants
  • Question 4
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    Q. The right side of the equation below is called the
    answer choices
    products
    reactants
  • Question 5
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    Q. Which statement is not a description of a chemical reaction?
    answer choices
    A solid is dropped into a beaker of liquid and a gas is released.
    Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
    A solid is dropped into a beaker of liquid and an explosion occurs.
    A liquid is heated in the sun and half of it evaporates.
  • Question 6
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    Q. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
    answer choices
    Coefficient
    reactant
    subscript
    product 
  • Question 7
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    Q. A chemical reaction that absorbs heat
    answer choices
    Single replacement
    Exothermic
    Endothermic
    Decomposition
  • Question 8
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    Q. In a chemical reaction
    answer choices
    The atoms of the reactants always stay together to form the products
    The atoms of the reactants unbond, rearrange, and then rebond to form the products
    New atoms are formed which combine to make the products
    Some atoms disappear while others multiply to form the products
  • Question 9
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    Q. Which of the following answers will balance the equation below?
    __K + __Br2 --> __KBr
    answer choices
    2, 1, 1
    2, 3, 2
    2, 1, 2
    1, 2, 3
  • Question 10
    120 seconds
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    Q. If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be
    answer choices
    4CO₂ + 3H₂O
    3CO₂ + 4H₂O
    2CO₂ + 3H₂O
    3CO + 4H₂O
  • Question 11
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    Q. Which of the following options correctly balances the equation below?
    __HNO+ __O2 --> __HNO3
    answer choices
    4, 1, 4
    1, 2, 1
    1, 2, 1
    2, 1, 2
  • Question 12
    300 seconds
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    Q.

    How many Carbons are present on the reactant side?

    answer choices

    1

    2

    3

    4

  • Question 13
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    Q.

    How many Hydrogens are on the product side of this chemical equation?

    answer choices

    1

    2

    3

    4

  • Question 14
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    Q.

    Is this chemical equation balanced? Why or why not? Choose the BEST answer.

    answer choices

    Yes, the amount of atoms for each element are equal on both the reactant and product side.

    No, the carbons are not the same number on both the reactant and product side.

    No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

    No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

  • Question 15
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    Q. Number of C's in 2Na₂CO₃
    answer choices
    1
    2
    3
    5
  • Question 16
    180 seconds
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    Q. Which of the following shows the correct way to balance the chemical equation?
    Fe + O2 -> Fe2O3
    answer choices
    4Fe + 3O2 -> 2Fe2O3
    2 Fe + 3O2 -> Fe2O6
    4 Fe + O6 -> 2Fe2O3
    None of the options are correctly balanced.
  • Question 17
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    Q. Balance this equation,            
    Al2O3 --> Al + O2 
    answer choices
    Cannot be balanced
    2Al2O3 --> 2Al+3O2 
    2Al2O3--> 4Al+3O2 
    3Al2O3--> 2Al+O2 
  • Question 18
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    Q. the starting materials in a chemical reaction
    answer choices
    Products
    Reactants
    Starters
    Enders
  • Question 19
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    Q. a chemical reaction that releases energy by light or heat
    answer choices
    Endothermic Reaction
    Exothermic Reaction
    Diffusion
    Fission
  • Question 20
    45 seconds
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    Q. If reaction starts with 20g of reactants it should produce... 
    answer choices
    a total of 40g of product
    a total of 10g of product
    a total of 80 g of product
    a total of 20g of product
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