Interactive multiple-choice quiz: مراجعة الهيكل

A

Use a magnet to pull out the sand, then boil the remaining salt.

B

Add water to dissolve the salt, filter the mixture to catch the sand, and dry the sand.

C

Heat the dry mixture until the sand vaporizes, leaving the salt behind.

D

Pour the mixture through a centrifuge until the salt turns into an element.

A

Filtration

B

Distillation

C

Magnetic Separation

D

Sublimation

A

Dissolve the entire mixture in water and filter it.

B

Heat the mixture until the sulfur undergoes deposition.

C

Pass a strong magnet over the mixture to attract the iron filings.

D

Evaporate the mixture until the iron filings melt over a range of temperatures.

A

The temperature at which a liquid boils

B

The density of a block of aluminum

C

The ability of a material to catch fire and burn

D

The physical shape and color of a solid crystal

A

Evaporation only works on substances with a high viscosity.

B

Water is an element and cannot be broken down by any physical or chemical means.

C

A mixture is combined physically and can be separated by physical changes; a compound is chemically bonded and requires chemical means to separate.

D

Liquid crystals inside the saltwater prevent the salt from boiling away.

A

An iron nail rusting after being left out in the rain

B

Crushing an aluminum soda can into a flat shape

C

A piece of firewood burning down into a pile of ash

D

A silver coin tarnishing and turning black over time

A

To increase the mechanical viscosity of the liquid inside

B

To protect light-sensitive chemicals from undergoing a chemical change caused by light absorption

C

to allow the patient to easily see if a suspension has settled to the bottom

D

To absorb the heat of fusion from the surrounding room temperature

A

A physical change is occurring because the states of matter are melting.

B

The liquids are forming an amorphous solid with a fixed volume.

C

A chemical change is occurring, resulting in the creation of a new substance.

D

The mixture has turned into a pure element that cannot be decomposed.

A

A physical change creates a new state of matter, while a chemical change does not.

B

A chemical change alters the actual identity of the substance, forming something completely new, while a physical change does not.

C

Physical changes can only happen in pure elements, while chemical changes happen in solutions.

D

Chemical changes are always caused by magnets, while physical changes are caused by Pascal's principle.

A

Melting a stick of butter in a frying pan over low heat

B

Dissolving a spoonful of instant coffee granules into hot water

C

Baking a mixture of flour, sugar, and eggs in the oven to form a cake

D

Crushing a cube of white sugar into fine powder using a mallet

A

12.5 g

B

25 g

C

50 g

D

0 g

A

12.5 g

B

25 g

C

2.85 g

D

2.58 g

A

18.02 g

B

20.04 g

C

2.85 g

D

15.201 g