REGULAR QUIZZES - REGULAR TOPIC 5 Chemical Reactions & Equations SET E
REGULAR Quizzes - REGULAR TOPIC 5 Chemical Reactions & Equations SET E.
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QUESTION 1. Which of the following would NOT indicate a chemical change (reaction)?
(A) A substance melting
(B) Two solutions mixing to produce a gas
(C) Two solutions mixing to produce a precipitate
(D) Two solutions mixing and a color change being observed
(E) A heat change when one substance comes into contact with another substance
QUESTION 2. Why must chemical equations be balanced?
(A) It looks better
(B) Matter must be conserved
(C) The products have to be
exactly
the same as the reactants
(D) They don't have to be balanced
(E) Energy must be conserved
QUESTION 3. How many nitrogen atoms appear on the reactant side of this balanced equation?
3Cu + 8HNO
3
==> 3Cu(NO
3
)
2
+ 2NO + 4H
2
O
(A) 3
(B) 8
(C) 24
(D) 11
(E) 6
QUESTION 4. Which of the following elements do NOT appear as diatomic molecules when written in equations as themselves?
(A) Nitrogen
(B) Oxygen
(C) Fluorine
(D) Chlorine
(E) Sodium
QUESTION 5. Reactants appear where in an chemical equation?
(A) Right Hand Side
(B) On the arrow
(C) Left Hand Side
(D) Nowhere
(E) None of the Above
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