Physical and Chemical changes, Law of conservation of mass
Authored by Leslie Anadjoe
Science
8th Grade
NGSS covered
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25 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. Sodium hydroxide dissolves in water.
Physical change
Chemical change
Answer explanation
Dissolving sodium hydroxide in water is a physical change because it involves a change in state (solid to solution) without altering the chemical composition of the substance.
Tags
NGSS.MS-PS1-2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. Hydrochloric acid reacts with potassium hydroxide to produce a salt, water and heat.
Physical change
Chemical change
Answer explanation
The reaction of hydrochloric acid with potassium hydroxide results in the formation of new substances (salt and water) and releases heat, indicating a chemical change. Physical changes do not produce new substances.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. A pellet of sodium is sliced in two.
Physical change
Chemical change
Answer explanation
Slicing a pellet of sodium is a physical change because it alters the size and shape of the sodium without changing its chemical composition. The substance remains sodium, thus classifying it as a physical change.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. Water is heated and changed to steam.
Physical change
Chemical change
Answer explanation
The process of heating water to steam is a physical change because it involves a change in state from liquid to gas without altering the chemical composition of the water.
Tags
NGSS.MS-PS1-4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. Potassium chlorate decomposes to potassium chloride and oxygen gas.
Physical change
Chemical change
Answer explanation
The decomposition of potassium chlorate into potassium chloride and oxygen gas involves breaking and forming chemical bonds, which is characteristic of a chemical change. Therefore, this process is classified as a chemical change.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. When placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms.
Physical change
Chemical change
Answer explanation
This is a chemical change because sodium reacts with water, producing hydrogen gas and sodium hydroxide. The formation of new substances indicates a chemical reaction has occurred.
Tags
NGSS.MS-PS1-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Classify the following as being a physical or chemical change. Evaporation
Physical change
Chemical change
Answer explanation
Evaporation is a physical change because it involves the transition of a substance from a liquid to a gas without altering its chemical composition.
Tags
NGSS.MS-PS1-4
NGSS.MS-PS3-4
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