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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
products
B
reactants
C
chemical equation
D
law of conservation of mass
2) The substances that are formed as a result of a chemical reaction.
A
reactants
B
chemical equation
C
law of conservation of mass
D
products
3) How many total oxygen atoms are found in this chemical formula? 5CO
A
1
B
5
C
2
D
6
4) How many elements are there in the following "make believe" compound? NaBrFeKSNO
A
10
B
6
C
5
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
increase then decrease
B
increase
C
remain the same
D
decrease
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 the same kinds and count of atoms on both sides
C
have different kinds of elements formed
D
have more product atoms than reactant atoms
7) How many molecules are in 20NaCl?
A
1
B
21
C
20
D
2
8) The subscript in a chemical formula indicates the
A
number of molecules
B
number of elements
C
reactivity index
D
number of atoms in a molecule
9) The coefficient indicates the number of
A
molecules
B
valence electrons
C
atoms
D
elements
10) This subatomic particle is responsible for the reactivity of an element.
A
neutron
B
valence electron
C
gluon
D
proton
*select an answer for all questions
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