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Chemical Equations And Reactions
Test Description: Do you know the parts of a chemical equation? Can you determine if it is balanced or not? Have fun reviewing!
Instructions: Answer all questions to get your test result.
1) The substances that chemically combine to form a new substance. They are found before the yeild sign.
A
chemical equation
B
law of conservation of mass
C
reactants
D
products
2) The substances that are formed as a result of a chemical reaction.
A
chemical equation
B
law of conservation of mass
C
products
D
reactants
3) How many total oxygen atoms are found in this chemical formula? 5CO
A
6
B
1
C
2
D
5
4) How many elements are there in the following "make believe" compound? NaBrFeKSNO
A
10
B
5
C
6
D
7
5) The mass of reactants equals 56.33g. A student performs a chemical reaction in a closed container. The student expects the mass to
A
remain the same
B
decrease
C
increase then decrease
D
increase
6) Another way of describing the Law of the Conservation of Mass is understanding that in a chemical equation it must
A
have more reactant atoms than product atoms
B
have more product atoms than reactant atoms
C
have the same kinds and count of atoms on both sides
D
have different kinds of elements formed
7) How many molecules are in 20NaCl?
A
2
B
21
C
1
D
20
8) The subscript in a chemical formula indicates the
A
number of elements
B
number of molecules
C
reactivity index
D
number of atoms in a molecule
9) The coefficient indicates the number of
A
molecules
B
valence electrons
C
elements
D
atoms
10) This subatomic particle is responsible for the reactivity of an element.
A
gluon
B
neutron
C
valence electron
D
proton
*select an answer for all questions
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