Elements And Compounds

Question 1

What is an element

Answer 1

A substance that is made of only one type of atom. It cannot be broken down into simpler substances

Question 2

Whats a compound

Answer 2

A compound is a substance formed when two or more elements are chemically bonded together.

Question 3

Name compounds made of 2 elements

Answer 3

Water
Carbon dioxide
Sodium chloride

Question 4

Name compounds made up of 3 elements where one of the elements is oxygen

Answer 4

Calcium carbonate
Glucose

Question 5

State the difference between a compound and a mixture:

Answer 5

A compound is chemically bonded, and its components cannot be separated by physical means
A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical methods

Question 6

Describe what a molecule is:

Answer 6

A group of two or more atoms bonded together. It can be made of the same element

Question 7

I can state the 4 main gases in the air, their percentages, and their chemical formula

Answer 7

Nitrogen (N₂) – about 78%
Oxygen (O₂) – about 21%
Argon (Ar) – about 0.93
Carbon dioxide co2 about 0.04%

Question 8

I can identify elements, compounds, and mixtures using particle diagrams:

Answer 8

• Elements have diagrams showing only one type of atom.
• Compounds show molecules with different types of atoms chemically bonded.
• Mixtures show more than one type of particle (atoms or molecules) that are not bonded.