Question 21

Question

Classify each change listed below as either a chemical or physical change in matter.

Column A
1.
Liquid water boiling and becoming steam:
Liquid water boiling and becoming steam
2.
Silver metal tarnishing and becoming silver sulfide.:
Silver metal tarnishing and becoming silver sulfide.
3.
Paper burning:
Paper burning
4.
Bending copper wire:
Bending copper wire
5.
Dissloving salt in water:
Dissloving salt in water
6.
Iron rusting to become iron oxide.:
Iron rusting to become iron oxide.
Column B
a.Chemical Change
b.Physical Change
Question 22
What would happen if a scuba tank (a rigid, sealed gas cylinder) heats up?

a
The size of the gas particles in the tank would increase.
b
The pressure exerted by the gas in the tank would increase.
c
The number of particles in the tank would increase.
d
The density of the gas in the tank would increase.
Question 23
What is the difference between a vector and a scalar?

a
A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude
b
A vector measurement is required for distance, a scalar measurement is required for displacement
c
A vector is only used in measuring forces, a scalar is only used in measuring mass
d
A vector is only measured in SI units, where scalars are only measured in US Customary units

Answer 1

Question 21: Classification of Changes

1. Liquid water boiling and becoming steam: b. Physical Change
2. Silver metal tarnishing and becoming silver sulfide: a. Chemical Change
3. Paper burning: a. Chemical Change
4. Bending copper wire: b. Physical Change
5. Dissolving salt in water: b. Physical Change
6. Iron rusting to become iron oxide: a. Chemical Change

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Question 22: Effect of Heating a Scuba Tank
The correct answer is: b. The pressure exerted by the gas in the tank would increase.
When the temperature of the gas increases, the kinetic energy of the gas particles increases, leading to an increase in pressure, as long as the volume remains constant.

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Question 23: Difference Between Vector and Scalar
The correct answer is: a. A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude.
Vectors have both magnitude and direction (e.g., velocity, force), while scalars have only magnitude (e.g., temperature, mass).