A student has a sample of a solid dissolved in a liquid. The task is to separate the mixture into its pure components. What question is best asked in the design of the experiment to determine how to separate the components?

Will the solvent evaporate at a different temperature than the solute in a distillation procedure?

Can the solution be filtered using filter paper and a funnel?

Can the solid be physically removed with forceps or a small manipulative?

Will the solid form a distinct layer on the bottom of the mixture when the mixture is not in motion?

Hydrogen and oxygen combine to form water, as shown in the diagram below. Based on the diagram, which statement best represents the formation of water from hydrogen and oxygen?

A pure substance has formed from the hydrogen and oxygen chemically combining.

A mixture has formed from hydrogen and oxygen physically combined.

A mixture has formed from hydrogen and oxygen chemically combined.

A pure substance has formed from the hydrogen and oxygen physically combining.

How does a compound differ from a mixture?

Each substance in a compound loses its characteristic properties.

Compounds have two or more components.

Compounds are commonly found in nature.

Solids, liquids, and gases can form compounds.

Which of the following sentences best describes table salt, NaCl?

Table salt is a compound made from two elements.

Table salt is a mixture made from two elements.

Table salt is an element made from two mixtures.

Table salt is an alloy made from a metal and a nonmetal.

When elements form mixtures,

the elements keep their original properties.

the elements react to form a new substance with new properties.

the elements combine in a specific mass ratio.

the elements always change their physical state.

The table below identifies characteristics of two substances, P and Q. Which of these can be concluded about substances P and Q?

P is an element and Q is a mixture

P is a mixture and Q is a compound

P is a compound and Q is an element.

Which is an example of a container that is filled with a pure substance rather than a mixture?

a glass jar filled with lemonade

A student investigated separating a mixture made of water, paperclips, soil, red dye, and oil. The results are in the table. Why was the student unable to separate the red dye from the water?

The red dye and water mixture is a solution, and it is difficult to separate physically without heat.

The red dye and water mixture is a heterogeneous mixture, and it is difficult to separate physically.

The red dye and water mixture is a heterogeneous mixture and is chemically combined.

The red dye and water mixture is a solution and is chemically combined.

The picture below represents which type of substance?

Mixture of elements and compounds

Based on the diagram, identify the type of substance represented.

Mixture of elements and compounds

What happens when a liquid freezes?

The particles lose kinetic energy and turn into a solid

The particle lose kinetic energy and turn into a gas

The particles gain kinetic energy and turn into a solid

What is a physical property?

A property that we can measure or observe with our 5 senses or other tools

How two chemicals react with one another when combined

When two chemicals react with one another to form a new substance

When a change occurs but it does not result in the formation of a new substance

are spread apart, moving fast, and change volume very easily

are tightly packed and vibrate in place

are close together but can slide past each other

Pure, compound, Mixture

Authored by D Schütze

Chemistry

8th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is an example of a container filled with a pure substance?

a glass of iced tea

a bucket of salt water

a tire filled with air

a balloon filled with helium

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many different types of molecules are pictured?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of substance is pictured?

element

compound

mixture

solution

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of substance is pictured?

element

compound

mixture

solution

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of substance is pictured?

element

compound

mixture

solution

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of substance is pictured?

element

compound

mixture

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A substance that can NOT be broken down by physical or chemical means

element

compound

mixture

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Pure, compound, Mixture

Which is an example of a container filled with a pure substance?

How many different types of molecules are pictured?

What type of substance is pictured?

What type of substance is pictured?

What type of substance is pictured?

What type of substance is pictured?

A substance that can NOT be broken down by physical or chemical means

Matter is anything that has...

Matter that is composed of one type of atom is ...

A combination of substances that are not bonded together is...

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