8th Unit 2 Review 2024

What does a chemical formula identify?

• The type of molecule

• The temperature at which a substance melts.
• The physical state of a substance.
• The types and quantities of atoms in a molecule.

Tags

NGSS.MS-PS1-1

How can I tell the elements in a chemical formula or equation?

• Each capital letter means a new element

• Each lower case letter means a new element

• Each subscript means a new element

• Each coefficient means a new element

Tags

NGSS.MS-PS1-1

In the Equation 4H₃O₂, Which of the following describes the number 4?

• This is a coefficient and says how many molecules there are

• This is a coefficient and says how many hydrogens there are

• This is a subscript and says how many molecules there are

• This is a subscript and says how many hydrogen there are

Tags

NGSS.MS-PS1-1

6CO₂, how many of each element is present?

• Carbon - 6

  Oxygen - 12

• Carbon - 1

  Oxygen - 2

• Carbon - 6

  Oxygen - 2

• Carbon - 1

  Oxygen - 12

Tags

NGSS.MS-PS1-1

How many of each element is present in 10C₂H₆OCO₂?

• Carbon - 2

  Hydrogen - 6

  Oxygen - 2

• Carbon - 21

  Hydrogen - 6

  Oxygen - 3

• Carbon - 22

  Hydrogen - 16

  Oxygen - 21

• Carbon - 30

  Hydrogen - 60

  Oxygen - 30

Tags

NGSS.MS-PS1-1

Categorize the following:

Groups:

(a) 1 molecule

,

(b) 2 molecules

,

(c) 3 molecules

,

(d) 4 molecules

• 2Li₂O

• 4Li₂SO₄

• NH₄Cl

• H₂O

• CO₂

• 3Al₂O₃

• 4Li₂O

• 2H₂O

• 3HBr

• 4H₃NCH₃Br

• 2MgCl₂

• 3C₂H₆

Tags

NGSS.MS-PS1-1

Match the following chemical formulas/equations terms to their definitions

• Products

• The substances produced by a chemical reaction

• Coefficient

• Gives the number of molecules

• Subscript

• Gives the number of atoms of each element

• Reactants

• The substances involved in a chemical reaction

Tags

NGSS.MS-PS1-1

Mathematical Equivalence

OFF

Tags

NGSS.MS-PS1-1

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

How many atoms are there TOTAL in:
H₂SO₄

• 6
• 5
• 7
• 3

Tags

NGSS.MS-PS1-1