Substances and Mixtures

Question 1

Classification and example.

Answer 1

To classify or group by similarities. Ex, a food pyramid.

Question 2

Composition and example.

Answer 2

What something is made up of, or “composed” of. Ex, ingredients of chocolate chip cookies.

Question 3

All materials are either a _____ or a ______ of substances.

Answer 3

Pure substance or a mixture of subtances.

Question 4

Pure Substance

Answer 4

A pure substance, or simply a substance, is either an element or a compound. Substances cannot be broken down into simpler components and still maintain the properties of the/an original substance.

Question 5

What are substances made up of?

Answer 5

Substances are made up of one type of material.

Question 6

Give examples of pure substances and explain why.

Answer 6

Gold is a type of substance that is only made up of gold material; it cannot be broken down into anything else. Water is a substance made up of hydrogen and oxygen, which are both gases. If we were to break down water into its components, we would have gases and not water (the original substance). Salt is a substance made up of silvery metal (Sodium) and a greenish-yellow poisonous gas (Chlorine). If salt were separated into its components, it would no longer be salt.

Question 7

What are some other examples of substances?

Answer 7

Aluminum, Helium, Oxygen, Lithium, Neon, Mercury, and Copper.

Question 8

Element

Answer 8

If all the atoms in a substance are alike, that substance is an element. (Same color)

Question 9

Molecules

Answer 9

More than one atom.

Question 10

Compound

Answer 10

Is a substance in which the atoms of two or more elements combine in a fixed proportion.

Question 11

Example of a compound.

Answer 11

Table Salt- Sodium Metal+ Chlorine Gas. Chalk, and Baking Soda.

Question 12

What is the main difference between elements and compounds?

Answer 12

Elements are composed of one type of material and compounds are made up of more than one element.

Question 13

What do elements and compounds have in common?

Answer 13

1. Elements and compounds are both substances.
2. Elements and compounds are both made up of the same type of material.

Question 14

How can you tell if something is a compound?

Answer 14

It will be composed of more than one element. (Attached)

Question 15

How are elements and compounds related?

Answer 15

Elements and compounds are related because elements make up compounds.

Question 16

Mixture

Answer 16

Is either homogenous or heterogenous and is a material made up of two or more substances that can be easily separated by physical means.

Question 17

Why are heterogenous mixtures different from compounds?

Answer 17

Mixtures do not always contain the same proportions of the substances that make them up, while compounds do.

Question 18

Heterogenous Mixture

Answer 18

A mixture in which different materials can be distinguished easily.

Question 19

Give examples of easy to detect heterogenous mixtures and hard to detect.

Answer 19

Easy to detect include: Salad, Pizza, Cereal, and Marble Countertops.
While hard to detect includes, some clothing and pepperoni.

Question 20

Homogenous Mixture

Answer 20

Contains two or more gaseous, liquid, or solid substances that are blended evenly throughout.

Question 21

Solution

Answer 21

Another name for a homogenous mixture and is a homogenous mixture with particles so small they cannot be seen with a microscope and will never settle to the bottom of their container. (Remain constantly and uniformly mixed) SMALLEST PARTICLES OUT OF SO. CO. SUS.

Question 22

What is the main difference between heterogeneous mixtures and homogeneous mixtures?

Answer 22

Heterogeneous mixtures are not well blended, and you can see the components, where homogeneous mixtures are well blended. You can’t see what they are composed of.

Question 23

What do heterogeneous and homogeneous mixtures have in common?

Answer 23

1. They are both mixtures.
2. They are both made up of different substances.

Question 24

How can you tell if something is a homogeneous mixture?

Answer 24

It will be blended evenly, and you won’t be able to see what its composed of.

Question 25

How are substances and mixtures related?

Answer 25

Substances and mixtures are related because substances make up mixtures.

Question 26

Practice molecular levels and review slideshow!

Answer 26

;)

Question 27

Colloid + Tyndall Effect

Answer 27

Is a type of mixture that never settles. (Heterogenous Mixture)

1. Particles are larger than solution particles but smaller than suspension particles.
2. Particles can be seen through the Tyndall effect. Typically, light is invisible when it passes through liquids, but liquids with colloid particles do allow light to be seen. This scattering of light by colloid particles is called the Tyndall effect.
3. Particles don’t settle to the bottom.

Question 28

Suspension

Answer 28

Is a heterogenous mixture containing a liquid in which visible particles settle.

1. Largest particles
   2.Particles do settle to the bottom. You will see directions on these substances that say, “shake well before use.”

Question 29

Physical Change

Answer 29

Is one in which the chemical composition within the substance is unchanged. Arrangement changes, but are still molecules. (Ice cube to water)

Question 30

Chemical Change

Answer 30

Is one in which the chemical composition within the substance does change.

Question 31

What are the similarities between solutions, colloids, and suspensions?

Answer 31

1. All particles of mixtures.
2. Can be easily separated by physical means.