Worksheets8.P.1.3- Akins
Total questions: 21
Worksheet time: 11mins
Name
Class
Date
1.
Which best described the splitting of water molecules into hydrogen and oxygen atoms.
a)
A. a chemical change in which bonds are broken
b)
B. a chemical change in which bonds are created
c)
C. A physical change in which bonds are broken
d)
D. a physical change in which bonds are created
2.
Derrick placed 20 grams of baking soda into a small jar. He added 5 militers of vinegar and then quickly placed a lid on the jar. After the reaction, he determined the mass of the jar's contents. Which is most likely observation that Derrick made?
a)
A. A physical change occurred, causing an increase in the mass of the reactants
b)
B. A chemical change occurred, causing a decrease in the mass of the reactants
c)
C. The mass of the reactants before the reaction was equal to the mass of the products after the reaction
d)
D.
3.
A scientist dissolves sodium acetate in boiling water. Once the solution starts to cool, it forms solid crystals. Which is released from the solution as the crystals form?
a)
A. heat
b)
B. sodium
c)
C. acetate
d)
D. cold water
4.
When heated, copper metal will become a liquid at 1,084⁰C. Which property of the metal has been described?
a)
A. density
b)
B. reactivity
c)
C. specific heat
d)
D. melting point
5.
When a marshmallow is toasted over a fire, which is the best description for what happens to the outside of the marshmallow?
a)
A. chemical change
b)
B. physical change
c)
C. enzyme creation
6.
When is the best term to describe a chemical reaction that absorbs heat energy?
a)
catalytic
b)
exothermic
c)
endothermic
7.
A sea creature releases a liquid into the ocean that reacts with the water to form a seashell. Which process does this represent?
a)
A. freezing
b)
B. gas formation
c)
C. Change of state
d)
D. precipitate formation
8.
Which? is the best description for iron rusting quickly when exposed to water and salt?
a)
A. a change of state
b)
B. a chemical reaction
c)
C. a physical reaction
9.
A student kept a notebook during an investigation. Which recorded observation was most likely a physical change?
a)
A. The solution was heated for two minutes until it boiled.
b)
B. A solid formed when two liquids were mixed together.
c)
C. Two solutions were mixed and the resulting solution felt hot
d)
D. The color of two mixed solutions changed from clear to white
10.
Which will most likely occur during this reaction
reactants + energy →products
reactants + energy →products
a)
A. physical change
b)
B. temperature change
c)
C. production of energy
d)
D. production of a precipitate
11.
What observation would be made if a precipitate reaction will have occurred?
a)
A. bubbles
b)
B. change in color
c)
C. cloudy solution
12.
How can a scientist change a solid substance into a liquid?
a)
A. decrease the density
b)
B. increase the temperature
c)
C. increase the specific heat
d)
D. decrease the chemical reactivity
13.
A student observes tiny bubbles after combining 25 g of baking soda with 100 mL of vinegar in a beaker. The students measures the mass of the mixture after 5 minutes. What is the most likely outcome?
a)
A. A physical change and decrease in mass
b)
B. A physical change and increase in mass
c)
C. A chemical change and decrease in mass
d)
D. A chemical change and increase in mass
14.
Jose dropped a piece of ice on a 70 degrees Fahrenheit surface. A few minutes later, a puddle of water was on the surface. What kind of change did Jose observe.
a)
A. a physical change, because the identity of the substance remained the same even though the appearance of the substance changed.
b)
B. A physical change, because the mass of the water increased as the ice changed into water.
c)
C. A chemical change, because the white ice changed color and became clear as a liquid.
d)
D. A chemical change, because the white ice changed color and became clear as liquid.
15.
Which process is a chemical change?
a)
A. freezing
b)
B. melting
c)
C. burning
16.
Batteries lose effectivness over time because of chemical reactions that occur in the batteries. Where is the best place to store batteries to keep them for a longer period of time?
a)
A. Store them n a car.
b)
B. Store them in water.
c)
C. Store them at room temperature
17.
When baking soda and vinegar react, the product includes bubbles. What has most likely occurred?
a)
A. gas formation
b)
B. exothermic reaction
c)
C. precipitate formation
18.
Which indicates a physical change?
a)
A. change in state
b)
B. release of heat
c)
C. foramton of a precipitate
19.
After a scientist mixes two clear solutions, he is unable to detect a temperature change. However, he knows a chemical change occurred. Which evidence best proves a chemical change did indeed occur?
a)
A. There was an increase in the mass of the new solution produced.
b)
B. A solid precipitate was produced which settled out of the solution.
c)
C. There was a decrease in the volume of the new solution produced.
d)
Two distinct layers were observed when the two original solutions were combined.
20.
Which indicates a physical change?
a)
A. change in state
b)
B. release of heat
c)
C. formation of a precipitate
21.
Which is an example of a chemical reaction?
a)
A. Vinegar added to baking soda forms a gas.
b)
Water evaporates into air.
c)
C. Sugar dissolves in water.
d)
D. Corn kernels are crushed to form flour
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