Chemical Equations
6 months ago
ms_daniels
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20 QuestionsShow answers
  • Question 1
    45 seconds
    Q.

    The products of a reaction have the same ________as the reactants.

    answer choices

    molecule

    atoms

    subscripts

    coefficients

  • Question 2
    300 seconds
    Q.

    When balancing this equation, Fe + Cl2 → FeCl3, the correct coefficient for Cl2?

    answer choices

    1

    2

    3

    4

  • Question 3
    60 seconds
    Q.

    Chemical reactions

    answer choices

    create and destoy atoms

    only occurs outside living organisms

    occurs only in living organisms

    produce new substances

  • Question 4
    60 seconds
    Q.

    What does this symbol Δ above the arrow mean?

    answer choices

    a precipitate is form

    heat is supplied

    a calalyst is needed

    electricity is needed

  • Question 5
    180 seconds
    Q.

    Balance this equation, CaCO3(s) → CaO(s) + CO2(g)?

    answer choices

    3,1,2

    1,1,1

    1,3,1

    2,6,3

  • Question 6
    300 seconds
    Q.

    Balance this equation, AlCl3 + NaOH → Al(OH)3 + NaCl

    answer choices

    3,1,3,1

    1,3,3,1

    1,1,1,3

    1,3,1,3

  • Question 7
    300 seconds
    Q.

    Balance the following equation: Cr(s) + Fe(NO3)2 (ag) → Fe(s) + Cr(NO3)3 (ag)

    answer choices

    2,3,3,2

    2,3,2,3

    4,6,6,2

    1,3,3,1

  • Question 8
    60 seconds
    Q.

    Chemical equations

    answer choices

    give directions for naming compounds

    describe only biological changes

    describe chemical reactions

    show how to write formulas

  • Question 9
    60 seconds
    Q.

    In the chemical equation H2O2(ag) → H2O(l) + O2(g), the O2 is a

    answer choices

    reactants

    yield

    products

    solid

  • Question 10
    300 seconds
    Q. Fill in the blanks with coefficient:
    PCl5+_ H2O→_ HCl+H3PO4
    answer choices
    4, 5
    1, 6
    3, 8
    2,2
  • Question 11
    60 seconds
    Q. Which side of a chemical equation is the product side?
    answer choices
    Left (before the yields sign)
    Right (after the yields sign)
  • Question 12
    60 seconds
    Q. What is a coefficient?
    answer choices
    The small number on the right of the chemical symbol.
    The large number to the left of a formula.
  • Question 13
    300 seconds
    Q. Balance this equation
    _Zn+_HCl-->_ZnCl+_H2
    answer choices
    1,1,2,1
    1,1,1,2
    1,2,1,1
    2,1,1,1
  • Question 14
    300 seconds
    Q. Balance this equation.
    _Mg + _Cl--> _MgCl2
    answer choices
    1, 2,1
    already balanced
    2,1,1
    1,1,2
  • Question 15
    300 seconds
    Q. How many atoms of aluminum are on each side of the following equation: 4Al + 3O--> 2AlO3
    answer choices
    2
    6
    1
    4
  • Question 16
    60 seconds
    Q. At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
    answer choices
    the product is doubled
    the product is half the mass of the reactants
    the mass is the same
    the mass changes depending on the reaction
  • Question 17
    300 seconds
    Q. Balance the equation:
    Si(OH)4+NaBr-->
     SiBr4+NaOH
    answer choices
    Si(OH)4+2NaBr--> SiBr4+NaOH
    Si(OH)4+4NaBr--> SiBr4+4NaOH
    Si(OH)4+NaBr--> SiBr4+4NaOH
    Si(OH)4+2NaBr--> SiBr4+2NaOH
  • Question 18
    60 seconds
    Q. Name the part in red:

    H2 + O2 -> H2O
    answer choices
    Coefficient
    Product
    Yield
    Subscript
  • Question 19
    30 seconds
    Q.

    To balance a chemical equation, it may be necessary to adjust the

    answer choices

    formulas of the products

    subscripts

    coefficients

    number of products

  • Question 20
    300 seconds
    Q.

    Which is the correct coefficient to balance this equation, NH4NO2 → N2 + H2O?

    answer choices

    1,1,2

    1,3,3

    3,2,1

    1,3,2

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