2.1.1 Elements, Compounds & Mixtures

Question 1

What is an element?

Answer 1

An element is a substance made of atoms that all contain the same number of protons and cannot be split into anything simpler.

Question 2

How many elements are found in the Periodic Table?

Answer 2

There are 118 elements found in the Periodic Table.

Question 3

What is a compound? (2 marks)

Answer 3

1. A compound is a pure substance made up of two or more elements chemically combined.
2. They cannot be separated into their elements by physical means.

Question 4

Why can’t compounds be separated into their elements by physical means?

Answer 4

Compounds cannot be separated into their elements by physical means because the elements are chemically combined, requiring chemical reactions to break them apart.

Question 5

How can mixtures be separated?

Answer 5

Mixtures can be separated by physical methods such as filtration or evaporation.