Elements, Compounds, and Mixtures

Question 1

Describe the properties of elements

Answer 1

an element’s properties don’t depend on the amount of the element present

Question 2

How do you classify elements by their properties?

Answer 2

elements are grouped into categories on the Periodic Table by the properties they share

Question 3

What are the Three Major Groups of Elements

Answer 3

Metals Nonmetals Metalloids

Question 4

Describe elemental molecules

Answer 4

form when two or more of the same type of atom chemically bond

Question 5

How do you identify a compound

Answer 5

By the compound’s chemical formula. By the compound’s atoms or particles

Question 6

What are compound molecules?

Answer 6

compound molecules form when two or more different atoms chemically bond

Question 7

How to identify an element

Answer 7

look at the periodic table of elements
by the elements chemical symbol
- look for 1 capital letter
by the element's atoms or particles
- only 1 type of atom is present in an element

Question 8

What us an homogeneous mixture?

Answer 8

A mixture of having the same kind of elements and a uniform composition.

1. the composition of the substance is uniform throughout the mixture
2. only contains one phase of matter
3. individual ingredients cannot be used separately

Question 9

What is an heterogeneous mixture?

Answer 9

A mixture is composed of different parts or elements.

1. Can be viewed separately, not uniform!
2. Do not blend with one another
3. Retain their physical identity- each part can be seen
4. Can contain more than one phase of matter (gas, liquid, solid_

Question 10

Is air a compound or a mxture?

Answer 10

Air is a mixture of compounds and elements.

Question 11

Mixture Notes

Answer 11

Mixtures don’t form in a specific ratio
a. portions of each element or compound can change without changing the identity of the mixture or substances
Mixtures can be separated through physical methods by physically picking out all the different particles, filter, distillation, magnet, centrifuge.

Question 12

What is a mixture?

Answer 12

Mixtures are substances held together by physical forces, not chemical bonds.
Mixtures are made up of combinations of elements and/or compounds.

Question 13

What are the types of chemical bonds?

Answer 13

covalent bonds- forms between two nonmetals
ionic bonds- forms between a metal and a nonmetal
metallic bond- forms between two metals

Question 14

How do you break down compounds?

Answer 14

Compounds can be broken down into elements or simpler compounds.
The only way to break down a compound is through chemical change.
Two ways to break down a compound is to apply heat or electric current.

Question 15

What are the properties of compounds?

Answer 15

Physical Properties: Melting Point, Density, Color

Chemical Properties: Reacts with acid, reacts with water, reacts with oxygen, reacts with light, and flammable

Question 16

Compound Notes

Answer 16

Physical and Chemical changes occur when compounds form.
Compounds are pure substances.
When elements chemically combine, they lost their original properties to make a new substance, with new properties.

Question 17

What is a Compound?

Answer 17

are substances composed of to or more different elements that are chemically combined or bonded.

Question 18

What are the physical properties of metalliods?

Answer 18

1. Some are shiny, some are dull
2. Somewhat malleable and ductile
3. Some conduct heat and electric current

Question 19

What are the physical properties of nonmentals?

Answer 19

1. Don’t conduct heat
2. Don’t conduct electricity
3. Dull (lacks luster)
   4 Brittle (breaks easily)

Question 20

What are the physical properties of metals?

Answer 20

1. Shiny (has luster)
2. Conducts heat
3. Conducts electric current
4. Malleable
5. Ductile

Question 21

What is a pure substance?

Answer 21

Is a substance in which there is only one type of particle or atom

Question 22

What is an element?

Answer 22

A pure substance that cannot be separated by physical or chemical means.