Counting Atoms in a Balanced Chemical Reaction

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1

How many Magnesium are in 10MgCl₂?

• 10
• 5
• 20

2H₂ + O₂ ----> 2H₂O What is the product?

• ------>
• 2H₂O
• 2H₂+ O₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.HS-PS1-7

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced
• unbalanced

Tags

NGSS.HS-PS1-7

Which of the following is an unbalanced equation?

• CaCO₃ --> CaO + CO₂

• PbO₂ + 2H₂-->2Pb + H₂O

• 2Na+ 2H₂O-->2NaOH + H₂

• CS₂ + 3O₂ --> CO₂ + 2SO₂

Tags

NGSS.HS-PS1-7

Is this balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• NO!

Tags

NGSS.HS-PS1-7

Fill in the blanks with coefficient:
PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Tags

NGSS.HS-PS1-7

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical equation

Tags

NGSS.MS-PS1-5