Unit 1 Lesson 4

Question 1

Atoms

Molecule

Answer 1

The smallest unit of an element that maintain the properties of that element
The basic building blocks of matter

A group of atoms bonded together

Question 2

Element

Answer 2

Made up of one type of atom

Example: Oxygen
Hydrogen

Question 3

Compound

Answer 3

Made up of different types of atoms chemically combined
Example: H2O (water)

Question 4

Mixture

Answer 4

Contains a variety of elements and compounds that are not chemically combined with each other

Question 5

Pure Substance

Answer 5

A substance that has definite physical and chemical properties such as appearance, melting point, and reactivity . Include elements and compounds
A. Made up of 1type of particle
B. Physical changes do not change the identity

Question 6

How Can Elements be Classified?

Answer 6

1. By their pH
2. As organic or inorganic (Organic means it contains carbon and hydrogen)
3. By their role in the body

Question 7

What are Mixtures?

Answer 7

1. Made up of more than 1 type of particle (not pure)
2. Can be separated by physical changes

Question 8

Heterogeneous Mixture

Homogeneous Mixture

Answer 8

A mixture that does not have a uniform composition. (You can see the different parts)
Examples: salad and trail mix

A mixture where the substances are evenly spread throughout (You can’t see the different parts)
Examples: salt water and air

Question 9

Suspension

Solution

Colloid

Answer 9

A mixture where the particles are too large to stay mixed without being stirred or shaken. The particles settle out

A mixture where one substance is dissolved in another substance

The particles are small and do not settle out quickly

Question 10

Methods to separate mixtures

Answer 10

1. Filtration - using a filter to separate solids from liquids
2. Distillation - separating substances based on their boiling point
3. Evaporation - removes a liquid from a solution by heating and leaves the solid behind