Chemical Equations And Reactions: Question Preview (ID: 7355)


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The substances that chemically combine to form a new substance. They are found before the yeild sign.
a) reactants b) products c) law of conservation of mass d) chemical equation
The substances that are formed as a result of a chemical reaction.
a) products b) reactants c) law of conservation of mass d) chemical equation
How many total oxygen atoms are found in this chemical formula? 5CO
a) 5 b) 6 c) 2 d) 1
How many elements are there in the following "make believe" compound? NaBrFeKSNO
a) 7 b) 10 c) 5 d) 6
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) increase c) decrease d) increase then decrease
Another way of describing the Law of the Conservation of Mass is understanding that in a chemical equation it must
a) have the same kinds and count of atoms on both sides b) have more reactant atoms than product atoms c) have more product atoms than reactant atoms d) have different kinds of elements formed
How many molecules are in 20NaCl?
a) 20 b) 1 c) 21 d) 2
The subscript in a chemical formula indicates the
a) number of atoms in a molecule b) number of molecules c) number of elements d) reactivity index
The coefficient indicates the number of
a) molecules b) elements c) atoms d) valence electrons
This subatomic particle is responsible for the reactivity of an element.
a) valence electron b) proton c) neutron d) gluon
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