Question 1

Question

A)Why are intensive properties useful for identifying a substance?(1 point)
Responses

They are chemical properties.
They are chemical properties.

They are physical properties.
They are physical properties.

They describe the amount of substance you have.
They describe the amount of substance you have.

They do not depend on the amount of substance you have.
They do not depend on the amount of substance you have.
Question 2
A)
A man makes breakfast. He puts some toast in the toaster, and mixes some eggs with a little milk in a bowl. As he begins cooking the eggs, he smells the toast burning. He takes the toast out of the toaster and puts some butter on it, which melts. Finally, he pours some orange juice through a strainer to remove the pulp. He eats the meal, and he digests it as he drives to work in his car.

Which option correctly identifies a chemical and a physical change in the scenario?

(1 point)
Responses

Digesting food is a chemical change; the car burning gas is a physical change.
Digesting food is a chemical change; the car burning gas is a physical change.

Burning toast is a chemical change; straining orange juice is a physical change.
Burning toast is a chemical change; straining orange juice is a physical change.

Digesting food is a physical change; the car burning gas is a chemical change.
Digesting food is a physical change; the car burning gas is a chemical change.

Burning toast is a physical change; straining orange juice is a chemical change.
Burning toast is a physical change; straining orange juice is a chemical change.
Question 3
A)How would you describe the change of wood when it is burning?(1 point)
Responses

It is a physical change, where some of the intensive and extensive properties will change.
It is a physical change, where some of the intensive and extensive properties will change.

It is a chemical change, where both the intensive and extensive properties will not change.
It is a chemical change, where both the intensive and extensive properties will not change.

It is a chemical change, where some of the intensive and extensive properties will change.
It is a chemical change, where some of the intensive and extensive properties will change.

It is a physical change, where both the intensive and extensive properties will not change.
It is a physical change, where both the intensive and extensive properties will not change.
Question 4
A)Which option is a physical property of matter?(1 point)
Responses

acidity
acidity

boiling point
boiling point

flammability
flammability

reactivity
reactivity
Question 5
A)Max puts cereal in a bowl and pours milk over it. Which term best describes Max’s bowl of cereal?(1 point)
Responses

homogeneous mixture
homogeneous mixture

pure substance
pure substance

heterogeneous mixture
heterogeneous mixture

compound
compound
Question 6
A)Which list only includes terms that describe oxygen gas, O2?(1 point)
Responses

element, molecule, pure substance
element, molecule, pure substance

compound, molecule, pure substance
compound, molecule, pure substance

atom, compound, molecule
atom, compound, molecule

atom, element, molecule
atom, element, molecule
Question 7
A)Which statement about pure substances and molecules is correct?(1 point)
Responses

Molecules cannot be pure substances.
Molecules cannot be pure substances.

Pure substances cannot be molecules.
Pure substances cannot be molecules.

All pure substances are molecules.
All pure substances are molecules.

All molecules are pure substances.
All molecules are pure substances.
Question 8
A)When a single salt crystal is added to a cool liquid, large crystals form. Which statement about the original cool liquid is correct?(1 point)
Responses

The liquid is a pure substance because it was uniform before the crystal was added.
The liquid is a pure substance because it was uniform before the crystal was added.

The liquid is a heterogeneous mixture because the crystals can be easily separated from the liquid.
The liquid is a heterogeneous mixture because the crystals can be easily separated from the liquid.

The liquid is a homogeneous mixture because the substance that formed the large crystals was uniformly dissolved.
The liquid is a homogeneous mixture because the substance that formed the large crystals was uniformly dissolved.

The liquid is a pure substance because it was made up of a single compound.
The liquid is a pure substance because it was made up of a single compound.
Question 9
A)A mixture of copper sulfate and water is heated, leaving a residue of copper sulfate in the container. Which method was used to separate the mixture?(1 point)
Responses

chromatography
chromatography

distillation
distillation

evaporation
evaporation

filtration
filtration
Question 10
A)Which methods separate a mixture according to the size of the particles?(1 point)
Responses

filtration and chromatography
filtration and chromatography

distillation and evaporation
distillation and evaporation

filtration and evaporation
filtration and evaporation

distillation and chromatography
distillation and chromatography
correct answer please.

Answer 1

Here are the correct answers for each question you've presented:

Question 1
Correct Answer: They do not depend on the amount of substance you have.

Question 2
Correct Answer: Burning toast is a chemical change; straining orange juice is a physical change.

Question 3
Correct Answer: It is a chemical change, where some of the intensive and extensive properties will change.

Question 4
Correct Answer: boiling point

Question 5
Correct Answer: heterogeneous mixture

Question 6
Correct Answer: element, molecule, pure substance

Question 7
Correct Answer: All molecules are pure substances.

Question 8
Correct Answer: The liquid is a homogeneous mixture because the substance that formed the large crystals was uniformly dissolved.

Question 9
Correct Answer: evaporation

Question 10
Correct Answer: filtration and chromatography

Feel free to ask if you have any more questions!