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- 1. Multiple Choice
Which describe reactants?
They are the substances that exist before the reaction
They are the substances that exist after the reaction
They appear on the left side of the equation
They appear on the right side of the equation
- 2. Multiple Choice
Which describe products
They are the substances that exist before the reaction
They are the substances that exist after the reaction
They appear on the left side of the equation
They appear on the right side of the equation
- 3. Multiple Choice
A subscript tells
the charge.
the number of atoms (or group of atoms, if in parentheses).
how many molecules are present.
the number of protons.
- 4. Multiple Choice
Coefficients are
the large numbers that go in front of a chemical formula; they indicate how many moles or molecules/formula units are present.
the large numbers that go in front of a chemical formula; they indicate the charge.
the small dropped numbers inside a formula; they indicate how many of that atom is present in a molecule.
the small dropped numbers inside a formula; they indicate how many moles or molecules/formula units are present.
- 5. Multiple Choice
Why do we balance equations?
For math practice
Because the same number of atoms are present before and after a reaction--they are just rearranged.
To show how many atoms are lost or gained during a reaction.
To see whether the chemical reaction is possible.
- 6. Multiple Choice
Which is true of phase notations?
Up arrow means gas product
Down arrow means solid product
Arrows both directions mean reversible reaction
Triangle under arrow means heated reaction
Up arrow means gas reactant
Down arrow means solid reactant
Arrows both directions mean reversible reaction
Triangle under arrow means heated reaction
Up arrow means gas product
Down arrow means solid product
Arrows both directions mean reversible reaction
Triangle under arrow means combustible reaction
Up arrow means gas product
Down arrow means solid reactant
Arrows both directions mean failed reaction
Triangle under arrow means combustible reaction
- 7. Multiple Choice
What is notable about the following?
F2 H2 N2 Br2 O2 Cl2 I2
They are diatomic molecules. They exist in pairs in nature.
They have the same number of protons.
They have charges of +2.
They are diatomic molecules. They exist in pairs only in the lab.
- Comprehension for next 6 questions
To write a chemical equation, you must do the following.
Identify which substances are reactants and which are _____.
Write correct _______ for each substance.
Copy the chemical formulas for the reactants on a new line and draw a reaction ______ that points right.
Place formulas for products on the _____ side of the arrow.
Compare each kind of ____ on the left side to those on the right side (count/inventory them).
For any elements that are not balanced, place a _______ in front of the chemical symbol that needs to be increased.
8. Fill in the Blank1 minute1 pt1. Identify which substances are reactants and which are _____.
9. Fill in the Blank1 minute1 pt2. Write correct _______ for each substance
10. Fill in the Blank1 minute1 pt3. Copy the chemical formulas for the reactants on a new line and draw a reaction _____ that points right.
11. Fill in the Blank1 minute1 pt4. Place formulas for products on the ______ side of the arrow.
12. Fill in the Blank1 minute1 pt5. Compare each kind of ____on the left side to those on the right side (inventory them).
6. For any elements that are not balanced, place a coefficient in front of the chemical symbol that needs to be increased.
13. Fill in the Blank1 minute1 pt6. For any elements that are not balanced, place a ______ in front of the chemical symbol that needs to be increased.
- 15. Multiple Choice
Combustion involves
qualitative data (measuring temperature) and quantitative date (surroundings feel warmer).
quantitative data (measuring temperature) and qualitative date (surroundings feel warmer).
qualitative data only.
quantitative data only.
- 16. Multiple Choice
How can one prove that carbon dioxide gas is present?
CO2 will react with limewater (calcium hydroxide) to form a calcium carbonate precipitate (chalk).
CO2 will react with water to form a calcium carbonate precipitate (chalk) .
CO2 will react with calcium carbonate (chalk) to form limewater.
CO2 will react with calcium carbonate (chalk) to form water.
- 17. Multiple Choice
What role does oxygen play in combustion?
It is a reactant from the air.
It is a product.
It is both a product and a reactant.
It is not needed for combustion to occur, although it is sometimes present.
- 18. Multiple Choice
Diatomics exist in pairs
always, both when the element is by itself and when it is part of a compound
when the element is by itself but not necessarily when it is part of a compound
when the element is part of a compound but not when it is by itself
only if the compound has a positive charge
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