Chemistry Review

Priya, Noah, and David are studying chemistry together. They come across a compound with 4 atoms of hydrogen. How many atoms of hydrogen are in this compound?

• 1

• 2

• 3

• 4

Kai, Aria, and Avery are working on a chemistry project. They are examining a compound and need to determine the number of Iron atoms in it. Can you help them figure out how many atoms of Iron are in this compound?

• 1

• 2

• 3

• 4

Aiden, Noah, and Avery are studying chemistry together. They came across a sugar molecule, C₆H₁₂O₆. They are curious to know, how many atoms of hydrogen are in a sugar molecule?

• 6

• 12

• 18

• 2

Harper, Scarlett, and Aria are working on a chemistry project. They are asked to calculate the number of oxygen atoms in a sample of

3Fe₂O₃

. How many atoms of oxygen are in their sample?

• 6

• 9

• 18

• 2

Elijah, Hannah, and Nora are in a chemistry class. Their teacher shows them a molecule and asks them to select the correct chemical formula for it. What is the correct formula?

• B₁F₃

• BF

• BF₃

• FB

Henry and Benjamin are in a chemistry class. Their teacher, Charlotte, explains that a substance made up of atoms of two or more different elements joined by chemical bonds is called what?

• Molecule

• Compound

• Polar covalent bond

• Nonpolar covalent bond

Abigail and Ethan were conducting a science experiment. They noticed that no matter how they mixed their substances, the total amount of matter remained the same and was not created or destroyed. What is this principle called?

• Law of conservation of mass

• chemical equation

• subscript

• coefficient

The number in front of a chemical equation that multiplies the number of atoms.

• Law of conservation of mass

• chemical equation

• subscript

• coefficient

The number written to the lower right of an element that tells you the number of atoms.

• Law of conservation of mass

• chemical equation

• subscript

• coefficient