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Chemical Reactions And Equations
Test Description: Review for chemical reactions equations
Instructions: Answer all questions to get your test result.
1) All of the following are physical changes except:
A
shaping clay
B
paint drying
C
ice melting
D
rocket fuel burning
2) What happens during a chemical change?
A
a mixture occurs between two or more substances
B
substances with different properties keep their same properties
C
substances with different properties form a new substance
D
a solid dissolves in a liquid
3) All of the following are signs of a chemical reaction except one. Which is NOT a sign of a chemical react
A
a color change
B
one substance dissolves into another
C
gas bubbles is produced
D
light or heat is produced
4) When two substances were combined, bubbles formed and the temperature dropped. What does this likely mean?
A
one substance dissolved in the other
B
the two substances had low boiling points
C
a chemical reaction took place
D
the two substances do not react when combined
5) How do you know whether a chemical reaction between two substances has occurred?
A
one substance melts in the other
B
both substances stay separated
C
one substance dissolves in the other
D
new substances are created
6) What happens to atoms in a chemical reaction?
A
They turn into energy.
B
They are rearranged.
C
They become atoms of different elements.
D
They are destroyed.
7) Which of the following is an example of a chemical reaction?
A
salt and pepper are mixed in a bowl
B
iron rusts
C
water freezes
D
sugar dissolves in water
8) Which observation would most likely indicate that an exothermic reaction has occurred?
A
a color change
B
the production of gas bubbles
C
a decrease in temperature
D
an increase in temperature
9) Which observation would most likely indicate that an endothermic reaction has occurred?
A
a color change
B
the production of gas bubbles
C
a decrease in temperature
D
an increase in temperature
10) What does the law of conservation of matter state?
A
matter is neither created nor destroyed
B
matter is always changed into an equal amount of energy
C
the mass of the products is always less than the mass of the reactants
D
the mass of the products is always greater than the mass of the reactants
11) The mass of 2 reactants equals 10 grams. After the chemical reaction, what should be the total mass of the products?
A
20 grams
B
10 grams
C
0 grams
D
5 grams
*select an answer for all questions
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