Changes
that Materials Undergo
I. Learning Competency: Investigate
changes that take place under the following conditions.S5MT-Ic-d-2
LO
2.1:
Describe physical and chemical change operationally. S5MT-Ic-d-2.1
II. Directions:
Multiple Choice: Read each
question carefully; encircle the letter of the correct answer.
1.
Which undergoes a chemical change:
a. a piece of burning wood c. a cotton soaked in water
b. a floating balloon d. a piece of cloth
cut into pieces.
2.
Which product is formed by chemical change?
a. a gold ring c.
plastics cups
b. an earthen jar d.
wood furniture
3.
We can easily recognize that a chemical change occurred in matter because of
the following signs except?
a. change in colour c.
change in size and shape
b. production of gas d. formation of new
substance
4.
Which statement best describes a chemical change?
a. A new substance is formed.
b. The change is not effective
c. The change did not form a new
substance.
d. There is a change in shape, size
and texture.
5.
Which of these activities will result to a chemical change?
a. Ian mixes sugar and water.
b. Elma sweeps the dust from the
floor.
c. Beth uses baking soda powder she
bakes the cake.
B. State whether the scenarios are physical
or chemical change and then explain how
it becomes physically or chemically change.
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SCENARIOS
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PHYSICAL OR CHEMICAL CHANGE?
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EXPLANATION
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1.
Food coloring is dropped into water to give it color.
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2.
A straight piece of wire is coiled to form a spring
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3.
In a fireworks show, the fireworks explode giving off heat and light.
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4.
You forgot to dry the bread knife when you washed it and reddish brown spots
appeared on it.
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5.
You blow dry your wet hair.
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6.
An iron roof expose to the heat of the sun and rain
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7.
You’re heating a sugar to form a caramel
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8.
You’re boiling a water in a kettle
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9.
Metabolism of food in the body.
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10.
A piece of cloth cut into pieces.
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III. What did I learn
in this activity?
Physical
change- no new substance is made, like when water turns to ice.
Chemical
change- a new substance is made, like when you burn a candle.
References:
Science
and You 5 page 19-23
Answers key:
II.
1. a
2. c
3. c
4. a
5. c
B.
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Scenarios
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Physical or Chemical change
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Explanation
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1. Food coloring is dropped into the water to give it color
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Chemical change
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It is chemical change because the water change its color
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2. A straight piece of wire is coiled to form a spring
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Physical change
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Because only the wire’s shape have been changed and not its composition.
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3. In a fireworks show, the fireworks explode giving off heat and
light.
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Chemical change
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Because the firecrakers release heat, light and sound.
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4. You forgot to dry the bread knife, when you washed it and reddish
brown spots appeared on it
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Chemical change
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Because new substance appeared on the bread knife
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5. You blow dry your wet hair
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Physical change
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Because, in this scenario evaporation occurs, no new substance is
formed when liquid evaporates only its phase changes.
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6. A iron roof expose to the heat of the sun and rain
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Chemical change
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It is chemical change because if an iron were exposed in the heat of
the sun and rain it will rust. Chemical change occurs because new substance
have been formed.
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7. You’re heating a sugar to form a caramel
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Chemical change
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When the sugar melts it forms a new substance which caramel
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8. You’re boiling a water in a kettle
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Physical change
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Because the composition of water while boiling doesn’t changed.
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9. Metabolism of food in the body
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Chemical change
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It is chemical change because when metabolism of food in the body
occurs, the food in the body will turn into simpler substance
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10. A piece of cloth cut into pieces
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Physical change
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When a piece of cloth were been cut into pieces it only change its
shape and not it’s composition.
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