Understanding Chemical Reactions
Presentation
•
Science
•
9th Grade
•
Medium
Standards-aligned
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15 Slides • 16 Questions
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5
Multiple Choice
Spoiling food is an example of:
chemical change
physical change
no change
6
Multiple Choice
Which is an example of a different substance being formed?
glass breaking
metal melting
water freezing
wood burning
7
Multiple Choice
A change in an objects appearance, shape, and size without changing its composition is known as
Chemical change
Physical change
Physical-Chemical change
8
Multiple Select
Which of the following are signs of a chemical reaction?
Formation of a gas
A change in temperature
A change in color
A change in size
9
Multiple Choice
In a chemical reaction, the number of atoms in the reactants and the products...
Must be the same
Must be different
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12
Multiple Choice
Which of these is NOT a sign of a chemical reaction?
A phase change
Formation of a precipitate
A color change
A temperature change
13
Multiple Choice
14
Multiple Choice
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19
Multiple Choice
20
Multiple Choice
Coefficients in chemical formulas...
Multiply just the first atom
Add to the subscripts at the end of the molecule
Multiply elements without subscripts
Multiply EVERYTHING!
21
Multiple Choice
A ______ is a number written in front of a chemical formula.
Coefficient
Subscript
Exponent
Coordinator
22
Multiple Choice
The ______ are numbers found on the lower right-hand side of an element symbol.
Coefficient
Exponent
Multiplier
Subscript
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Multiple Choice
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Multiple Choice
When writing a chemical equation, reactants are on the _____________ while products are on the _________________.
top, bottom
right, left
left, right
bottom, top
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Multiple Choice
The law of conservation of mass states
chemical reactions create new atoms
atoms cannot be created or destroyed
reactants vanish once a reaction takes place
products appear when a reaction takes place
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Multiple Choice
Chemical equations
give directions for naming compounds
describe only biological changes
describe chemical reactions
show how to write formulas
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