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W14 Counting Atoms-Chem Reactions
Test Description: W14 Counting Atoms-Chem Reactions
Instructions: Answer all questions to get your test result.
1) What are 2 or more elements that are chemically combined?
A
cation
B
molecule
C
atom
D
bond
2) In a molecule, we know we have a new element each time we have a new _____ letter.
A
bold face
B
underlined
C
capital
D
lowercase
3) 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
subscript
C
coefficient
D
molecule
4) A subscript ___ affects the the element just before it.
A
only
B
sometimes
C
never
D
seldom
5) 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
coefficient
C
exponent
D
molecule
6) The coefficient _____ on each subscript in the molecule.
A
focuses
B
works
C
divides
D
multiplies
7) ____ are found on the left side of a chemical equation and they represent the chemicals we have before the reaction begins.
A
Products
B
Metals
C
Metalloids
D
Reactants
8) ____ are found on the right side of an equation and they represent the chemicals remaining when the reaction is complete.
A
Metalloids
B
Reactants
C
Metals
D
Products
9) The ____ divides the equation and we say the word produces or yields when we read the reaction.
A
equals sign
B
minus sign
C
arrow
D
plus sign
10) Identify this reaction: When 2 or more elements or compounds combine to form a single product.
A
Synthesis
B
Single Replacement
C
Decomposition
D
Combustion
11) Identify this reaction: A reaction where the cations of two ionic compounds exchange places to form two new compounds.
A
Synthesis
B
Double Replacement
C
Single Replacement
D
Combustion
12) 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
Decomposition
C
Synthesis
D
Combustion
13) 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
Combustion
C
Substitution
D
Synthesis
14) Identify this reaction: One reactant breaks down into 2 or more products.
A
Single Replacement
B
Double Replacement
C
Decomposition
D
Synthesis
*select an answer for all questions
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