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WorksheetsChemical Reactions and Acid/Bases
Total questions: 26
Worksheet time: 15mins
Example: H2
_Zn+_HCl-->_ZnCl2 +_H2
How many Hydrogen (H) atoms are in 4NH3?
4
1
3
12
In the equation shown, what are the reactant(s)?
N2 + H2
NH3
To balance an equation you should:
ONLY change subscripts.
ONLY change coefficients.
Change BOTH subscripts and coefficients.
Which of the following is a chemical reaction?
Sodium and chlorine atoms bond to form salt molecules.
Ice melts to form water.
Carbon dioxide freezes to form dry ice.
Salt and water mix to form salt water.
_____ reactions usually feel hot!
endothermic
exothermic
____ reactions usually feel cold.
endothermic
exothermic
Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?
lemon juice, milk, baking soda, bleach
bleach, baking soda, milk, lemon juice
milk, lemon juice, baking soda, bleach
baking soda, bleach, lemon juice, milk
The (a) scale measures the strength of acids and bases.
Black coffee has a pH of 5. It is a ________ ____________
Weak
Strong
Acid
Base
pH 3
Weak
Strong
Acid
Base
pH 14
Weak
Strong
Acid
Base
Scale that measures how acidic or basic something is.
aH
bH
pH
Hp
Pollution causes the pH of rain water fall below 5. What is such type of rain called?
acid rain
polluted rain
low pH rain
alkaline rain
What does the Law of Conservation of Energy state?
Energy cannot be gained or lost in a chemical reaction.
Energy can only be lost in a chemical reaction.
Energy can only be gained in a chemical reaction.
Energy can be gained and lost in a chemical reaction.
