Chemical Equations, Formulas, And Reactions Question Preview (ID: 49948)


Review Questions Over Chemical Equations, Formulas, And Reactions (Unit 2). TEACHERS: click here for quick copy question ID numbers.

What must be balanced on both sides of a chemical equation?
a) The number of elements used
b) The number of atoms of each element used in the equation
c) The amount of space in which the reaction takes place
d) The area of reaction and the volume of reaction

What is the large number in front of a chemical formula called?
a) Subscript
b) Yeild
c) Reactant
d) Coefficient

Which is the BEST set of indicators that a chemical reaction has happened?
a) temperature, color, smell
b) precipitate, light, new substance
c) Heat, light, bubbles, and glass
d) temperature, color, smell, precipitate, bubbling, light, new substance

Two clear liquid solutions are combined together, then a white solid precipitate begin falling to the bottom of the solution. This is evidence of a chemical reaction having occurred.
a) True
b) False
c)
d)

What are the small numbers to the bottom-left of an atomic symbol called?
a) Subscripts
b) Coefficients
c) Products
d) Yeilds

What are the chemical formulas on the RIGHT side of a chemical equation called?
a) Reactants
b) Subscripts
c) Products
d) Coefficients

What are the chemical formulas on the LEFT side of a chemical equation called?
a) Products
b) Reactants
c) Coefficients
d) Yeilds

What is a byproduct of most chemical reactions?
a) the release of heat energy
b) the release of cold energy
c) the absorption of energy
d) the creation of new atoms

How may atoms of Oxygen are in this formula? (assume that the numbers after each atomic symbol is the subscript for that element) - C2H4O4
a) 4
b) 2
c) 3
d) 0

How do humans use chemical reactions every day?
a) Walking
b) Waking up
c) The digestion of food
d) Going to sleep

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