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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
atom
B
molecule
C
cation
D
bond
2) In a molecule, we know we have a new element each time we have a new _____ letter.
A
underlined
B
capital
C
lowercase
D
bold face
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
coefficient
B
exponent
C
subscript
D
molecule
4) A subscript ___ affects the the element just before it.
A
never
B
seldom
C
only
D
sometimes
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
coefficient
B
molecule
C
subscript
D
exponent
6) The coefficient _____ on each subscript in the molecule.
A
multiplies
B
divides
C
works
D
focuses
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
Metalloids
C
Metals
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
Products
C
Metals
D
Reactants
9) The ____ divides the equation and we say the word produces or yields when we read the reaction.
A
arrow
B
plus sign
C
equals sign
D
minus sign
10) Identify this reaction: When 2 or more elements or compounds combine to form a single product.
A
Synthesis
B
Combustion
C
Single Replacement
D
Decomposition
11) Identify this reaction: A reaction where the cations of two ionic compounds exchange places to form two new compounds.
A
Double Replacement
B
Combustion
C
Synthesis
D
Single Replacement
12) Identify this reaction: one FREE element replaces another that was in a compound. This is also known as a Substitution reaction.
A
Synthesis
B
Decomposition
C
Combustion
D
Single Replacement
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
Synthesis
B
Substitution
C
Combustion
D
Decomposition
14) Identify this reaction: One reactant breaks down into 2 or more products.
A
Double Replacement
B
Synthesis
C
Single Replacement
D
Decomposition
*select an answer for all questions
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