2022 7th Grade Chemical Reactions

  What is the left part of the chemical equation called?

Li  +  AlCl₃  —-> LiCl  + Al

• Product

• Yield

• Reactant

What is the right side of the chemical reaction called?

Li  +  AlCl₃  —-> LiCl  + Al

• Reactant

• Product

• Yield

What are the total number of atoms present?

3Al₂Cl₃

• 3

• 9

• 15

How many atoms of Al are in the following compound?

AlCl₃

• 3

• 1

• 0

What is the big number before the chemical formulas called?

2 Li  +  AlCl₂  —-> 2 LiCl  + Al

• Subscript

• Yield

• Coefficient

What is the little letter behind the element called?

O₂

• Subscript

• Yield

• Coefficient

Is the following equation balanced?

H₂ + O₂ ----> H₂O

• Yes

• No

How many elements are in C₃H₂O₂?

• 3

• 2

• 7

Tags

NGSS.MS-PS1-1

During a chemical reaction matter is not (a)   or destroyed.

(Law of conservation of mass)

Tags

NGSS.MS-PS1-5

In a chemical equation, are you able to change a subscript?

(the little number)

• Yes

• No

• only to balance the equation