Question 1

Which of the following best describes the main goal of the 'Separating a Mixture' lab?

Accepted Answer

To separate a mixture of sand, iron, chalk, salt, beans, and water into pure substances.

Question 2

Which property would be most useful for separating iron from the mixture described in the lab?

Accepted Answer

Magnetism

Question 3

If you wanted to separate salt from the mixture, which method would be most effective?

Accepted Answer

Dissolve the mixture in water and then evaporate the water.

Question 4

Why is it important to take the mass of the mixture before starting the separation process?

Accepted Answer

To compare the total mass before and after separation and check for loss of material.

Question 5

Which of the following is NOT a pure substance in the context of this lab?

Accepted Answer

The original mixture

Question 6

After separating the mixture, you find the total mass of all separated components is less than the original mass. Which is the most likely explanation?

Accepted Answer

Some material was lost during the separation process.

Question 7

Which separation technique would be most effective for removing beans from the mixture?

Accepted Answer

Hand picking

Question 8

Suppose you dissolve the mixture in water and then filter it. Which components would most likely remain on the filter paper?

Accepted Answer

Sand, chalk, and beans

Question 9

Which of the following best explains why water is not considered a final product in this lab?

Accepted Answer

Water is used as a solvent and is not separated as a component at the end.

Question 10

If you wanted to verify that the salt you separated is pure, which of the following would be the best method?

Accepted Answer

Measure its melting point and compare to the known value for $$\mathrm{NaCl}.$$

Question 11

Which of the following equations best represents the law of conservation of mass as applied to this lab?

Accepted Answer

$$m_{\mathrm{mixture}} = m_{\mathrm{sand}} + m_{\mathrm{iron}} + m_{\mathrm{chalk}} + m_{\mathrm{salt}} + m_{\mathrm{beans}}$$

Question 12

A student claims that after separation, the mass of salt obtained is greater than the mass of salt originally present in the mixture. Which is the most likely reason for this observation?

Accepted Answer

The salt absorbed water during the process.

Question 13

Which of the following is an example of a physical change that occurs during the separation of the mixture?

Accepted Answer

Dissolving salt in water

Question 14

If you wanted to separate chalk from sand after filtration, which property would you most likely use?

Accepted Answer

Solubility in water

Question 15

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that retain their individual properties.

Question 16

During the separation process, which step would most likely involve evaporation?

Accepted Answer

Recovering salt from a saltwater solution

Question 17

Which of the following is a correct sequence of steps for separating the mixture described in the lab?

Accepted Answer

Use a magnet to remove iron, hand-pick beans, dissolve salt in water, filter to separate sand and chalk, evaporate water to recover salt.

Separation of Mixtures: Lab Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드