W14 Counting Atoms-Chem Reactions Question Preview (ID: 62466)
W14 Counting Atoms-Chem Reactions.
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What are 2 or more elements that are chemically combined?
a) cation
b) bond
c) atom
d) molecule
In a molecule, we know we have a new element each time we have a new _____ letter.
a) lowercase
b) capital
c) bold face
d) underlined
What is a number placed after an element and below the line that tells us how many atoms of that element are in the molecule?
a) exponent
b) coefficient
c) subscript
d) molecule
A subscript ___ affects the the element just before it.
a) only
b) never
c) seldom
d) sometimes
What is a number placed before a molecule that tells us how many of those molecules we have in the formula. This large number is placed in front or to the left of the element or molecule?
a) subscript
b) molecule
c) exponent
d) coefficient
The coefficient _____ on each subscript in the molecule.
a) divides
b) multiplies
c) works
d) focuses
____ are found on the left side of a chemical equation and they represent the chemicals we have before the reaction begins.
a) Metals
b) Metalloids
c) Reactants
d) Products
____ are found on the right side of an equation and they represent the chemicals remaining when the reaction is complete.
a) Products
b) Reactants
c) Metalloids
d) Metals
The ____ divides the equation and we say the word produces or yields when we read the reaction.
a) equals sign
b) minus sign
c) plus sign
d) arrow
Identify this reaction: When 2 or more elements or compounds combine to form a single product.
a) Decomposition
b) Synthesis
c) Combustion
d) Single Replacement
Identify this reaction: A reaction where the cations of two ionic compounds exchange places to form two new compounds.
a) Synthesis
b) Combustion
c) Double Replacement
d) Single Replacement
Identify this reaction: one FREE element replaces another that was in a compound. This is also known as a Substitution reaction.
a) Single Replacement
b) Synthesis
c) Decomposition
d) Combustion
Identify this reaction: When a compound or element reacts with oxygen, releasing a large amount of energy in the form of light and heat.
a) Decomposition
b) Substitution
c) Synthesis
d) Combustion
Identify this reaction: One reactant breaks down into 2 or more products.
a) Single Replacement
b) Double Replacement
c) Decomposition
d) Synthesis
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