Question 1

Which of the following is a characteristic property that can be used to identify a pure substance?

Accepted Answer

Melting point

Question 2

Why must pressure be specified when quoting the boiling point of a pure substance?

Accepted Answer

Because boiling point changes with pressure

Question 3

A sample of pure copper melts at 1083°C. What type of property is this?

Accepted Answer

Characteristic physical property

Question 4

Which formula correctly expresses density?

Accepted Answer

$$Density = \frac{Mass}{Volume}$$

Question 5

Why is density considered a characteristic property?

Accepted Answer

It is unique for each pure substance and does not change with sample size

Question 6

According to the particle model, why is the density of a gas lower than that of a liquid or solid?

Accepted Answer

Gas particles are farther apart, so there are fewer particles in a given space

Question 7

Why does ice float on water?

Accepted Answer

Ice has a lower density than liquid water

Question 8

Which of the following is NOT a characteristic property?

Accepted Answer

Volume

Question 9

A scientist wants to identify an unknown pure substance. Which property should they measure?

Accepted Answer

Melting point

Question 10

If a liquid has a density of $$0.8 \ g/cm^3$ and a solid has a density of 2.7$$ \ $$g/cm^3$$, which will float when placed in water ($$1.0 \ g/cm^3$)?

Accepted Answer

Only the liquid will float

Question 11

Which statement best explains why many substances are colourless liquids and cannot be identified by colour?

Accepted Answer

Colour is a non-characteristic property and many substances share it

Question 12

A student measures the mass and volume of a sample and calculates its density. What does this value tell them?

Accepted Answer

A property that can help identify the substance

Question 13

Which of the following is a reason why knowing the melting and boiling points of substances is useful in everyday life?

Accepted Answer

To identify when a substance will change state during cooking

Question 14

Which property would change if you increased the amount of a substance in a sample?

Accepted Answer

Volume

Question 15

Which of the following best describes a non-characteristic property?

Accepted Answer

It cannot be used to identify a pure substance

Question 16

A block of ice is placed in water and floats. What does this indicate about the densities of ice and water?

Accepted Answer

Ice is less dense than water

Question 17

Which of the following is a correct statement about the particle model and density?

Accepted Answer

Particles in a gas are farther apart, resulting in lower density

Question 18

Which property would remain unchanged if you cut a pure gold bar in half?

Accepted Answer

Density

Question 19

Which of the following is an example of using a characteristic property in a real-world scenario?

Accepted Answer

Identifying a metal by its melting point

Question 20

A scientist finds a clear, odourless liquid. Which property should they measure to help identify it?

Accepted Answer

Density

Characteristic and Non-Characteristic Properties in Chemistry

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