quiz 2 elements

Contains only one kind of atom.

• Element
• Compund
• Mixture

Contains two or more atoms combined in a fixed ratio

• Elements
• Compounds
• Mixtures

The air is a _________. 

• element 
• mixture 
• compound 
• energy 

Elements can be broken down into simpler substances. 

• false 
• true 
• sometimes 

What is H₂SO₄ 
 made up of?

• 2 hydrogen, 1 sulfur, 4 oxygen
• 1 hydrogen, 2 sulfur, 4 oxygen
• 2 hydrogen & 4 sodium
• 1 hydrogen & 6 sodium

how many grams of oxygen are there in 20 grams of water?

• 11.11 g

• 20 g

• 15.2 g

• 14 g

The diagram shows the structure of three atoms. Which pair are isotopes?

• P & R

• P & Q

• Q & R

What is the number of neutrons in magnesium isotope?

• 12

• 13

• 25

• 37

Atoms of this isotope have how many neutrons in their nuclei?

A is

• number of proton and neutrons.

• number of protons.

• number of electrons.

• number of neutrons.