
Pure Substances and Density
Authored by peerawit smc
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7th Grade

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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a pure substance?
A pure substance is always a liquid or gas.
A pure substance has varying composition depending on its environment.
A pure substance can contain multiple types of particles.
A pure substance is a material with a uniform and definite composition, consisting of only one type of particle.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Give an example of a pure substance.
Distilled water
Gold
Air
Saltwater
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the definition of density?
Density is the total mass of a substance regardless of its volume.
Density is mass per unit volume.
Density is the volume of an object divided by its mass.
Density is the weight of an object.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is density calculated?
Density = Mass / Volume
Density = Mass x Volume
Density = Volume / Mass
Density = Mass + Volume
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What units are commonly used to measure density?
grams per liter (g/L)
grams per cubic centimeter (g/cm³), kilograms per cubic meter (kg/m³), pounds per cubic foot (lb/ft³)
ounces per gallon (oz/gal)
milliliters per gram (mL/g)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between a pure substance and a mixture?
A pure substance can be a combination of different elements.
A mixture has a fixed composition; a pure substance does not.
A pure substance has a uniform composition; a mixture contains multiple substances.
A pure substance is always a solid, while a mixture can be a liquid.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you separate a mixture into pure substances?
Mix the substances thoroughly
Use methods like filtration, distillation, evaporation, or chromatography.
Add water and stir vigorously
Use a magnet to attract particles
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