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WorksheetsUnit 7 Cscope Chemistry Test
Total questions: 9
Worksheet time: 5mins
Name
Class
Date
1.
To balance an chemical equation, one must change the:
a)
coefficients
b)
subscripts
c)
superscripts
d)
both coefficients and subscripts
2.
In a chemical equation, the symbol (s) following a substance means:
a)
the substance is aqueous
b)
the substance is a solid
c)
the substance has precipitated out of solution
d)
both "the substance is a solid" and "the substance has precipitated out of solution" are correct
3.
A (g) after a molecule in a chemical equation signifies:
a)
the substance is grounded
b)
the substance is a gas
c)
the substance is aqueous
d)
the substance is found in a gnome
4.
A substance that speeds up a reaction without being changed by the reaction is a:
a)
collision theory
b)
precipitate
c)
catalyst
d)
reactant
5.
This symbold, → means:
a)
reverse
b)
add heat
c)
gas
d)
yields
6.
The energy that is required for a reaction to begin is called:
a)
activation energy
b)
catalyst
c)
collision theory
d)
reactant process
7.
Which of the following reveals that a chemical reaction has occurred?
a)
a substance dissolves in solution
b)
a substance slows down
c)
heat is emitted from a substance
d)
there is no way to determine if a chemical reaction has occurred
8.
Balance the following equation:
Cu + AgNO3 → Cu(NO3)2 + Ag
Cu + AgNO3 → Cu(NO3)2 + Ag
a)
Cu + AgNO3 → Cu(NO3)2 + Ag
b)
Cu + 2AgNO3 → Cu(NO3)2 + Ag
c)
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
d)
Cu + 6AgNO3 → Cu(NO3)2 + 6Ag
9.
Write and balance the following chemical reaction: Solid iron reacts with hydrochloric acid to give aqueous iron (II) chloride and hydrogen gas.
a)
Fe(s)+2HCl(aq) →FeCl2(aq) +H2(g)
b)
Fe(s)+HCl2(aq)→ FeCl2(aq) + H(g)
c)
Fe + 2HCl → FeCl2 + H2
Fe2 + 2HCl → FeCl2 + H2
Fe2 + 2HCl → FeCl2 + H2
d)
2Fe(s) + 4HCl(aq) → 2FeCl2(aq) + 4H(g)
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