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Chemical Reactions
Test Description: 8.5E
Instructions: Answer all questions to get your test result.
1) Drew added yeast and sugar to lukewarm water and placed it in a flask. He stretched a balloon over the opening of the flask. He noticed small bubbles rising along the side of the flask as the balloon slowly began to inflate. Drew concluded that--
A
The strong smell was evidence of a physical change.
B
The water, sugar, and yeast were products of a chemical reaction.
C
A physical change was occurring.
D
The bubbles indicated a chemical change.
2) Antifreeze is a chemical used to protect cars from radiator leaks, freezing, and overheating. Which statement about antifreeze is most useful to know before planning a long road trip across the southwestern US this summer?
A
Antifreeze is odorless but has a sweet taste.
B
Antifreeze is used as a de-icing solution for aircraft and runways.
C
Using antifreeze and water in a car's radiator raises the boiling point of the mixture to 256° F.
D
Antifreeze is safe for the environment.
3) A student mixes two solutions, planning to produce a chemical reaction. Which of the following is NOT evidence that a chemical reaction is happening?
A
odor change
B
no observable change
C
temperature change
D
color change
4) A student mixes two solutions, planning to produce carbon dioxide. Which of the following is the BEST evidence that a chemical reaction is producing carbon dioxide?
A
formation of bubbles
B
temperature change
C
formation of a solid
D
color change
5) Which of the following demonstrates that a new substance can be formed from a chemical reaction?
A
milk souring
B
water evaporating
C
helium-filled balloon floating
D
iron bending
6) Hydrogen peroxide is a substance often used to disinfect wounds or cuts. Its chemical formula is H2O2. What is the ratio of hydrogen atoms to oxygen atoms?
A
1:1
B
2:1
C
2:4
D
1:2
7) Which of the following is a chemical property associated with wood?
A
ability to burn
B
floating on water
C
snapping when bent
D
having a rough surface
8) Which of the following is a chemical property of iron?
A
rusting over time
B
sticking to a magnet
C
conducting electricity
D
melting when heated
9) Which of the following is the BEST evidence that rusting is a chemical property rather than a physical property of iron?
A
Rust does not look the same as iron.
B
Rust can form on any iron.
C
Rust cannot turn back into iron.
D
Rust forms slowly.
10) In the process of a chemical reaction, which of the following is the LEAST LIKELY to occur?
A
yielding one or more products
B
no changes observed
C
products usually have different properties
D
visible chemical changes
*select an answer for all questions
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