Elements, Atoms, and Compounds

Question 1

What is matter made up of?

Answer 1

Particles called atoms.

Atoms are the fundamental building blocks of matter.

Question 2

What did Dalton’s atomic model state about atoms?

Answer 2

• Everything is made of tiny particles called atoms.
• All atoms of the same element are the same.
• Atoms of different elements are different.
• Atoms can join together to make compounds.
• In reactions, atoms don’t disappear or appear—they just rearrange.

Dalton’s model laid the foundation for modern chemistry.

Question 3

Fill in the blank: Dalton’s atomic model states that all atoms of the same element are _______.

Answer 3

[the same]

Question 4

True or False: According to Dalton, atoms can disappear or appear in chemical reactions.

Answer 4

False

Dalton emphasized that atoms only rearrange in reactions.

Question 5

What is one example of a compound that atoms can form?

Answer 5

Water

Water is a common example of a compound formed by the combination of hydrogen and oxygen atoms.

Question 6

Identify one characteristic of the Bohr model.

Answer 6

[Answer specific to Bohr model characteristics]

The Bohr model introduced the idea of quantized energy levels for electrons.

Question 7

What are atoms of different elements?

Answer 7

Different

Each element has unique properties due to its atomic structure.