Balancing Chemical Reactions Quiz

identify the correct coefficients to balance this chemical reaction:

__H₂O₂ --> __H₂O + __O₂

• already balanced
• 2,1,1
• 2,2,1
• 2,1,2

Tags

NGSS.MS-PS1-5

identify the correct coefficients to balance this chemical reaction:

__Na + __Cl₂ --> __NaCl

• 1,1,2
• 2,1,2
• 2,1,1
• already balanced

Tags

NGSS.MS-PS1-5

What is the basic unit of matter and is the smallest particle of an element?

• Atoms
• Elements
• Compounds
• Molecules

Two or more atoms chemically bonded together are called a

• atom
• element
• molecule
• mixture

Tags

NGSS.MS-PS1-1

How many carbon atoms are there in a methane (CH₄) molecule? 

• 0
• 1
• 4
• 5

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are there in a water molecule (H₂0)?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

What is the total number of atoms in an ammonia (NH₃) molecule?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0
• 1
• 2
• 3

Tags

NGSS.MS-PS1-1

Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –

• a gas at room temperature.
• made of two different elements.
• given off by green plants.

Tags

NGSS.MS-PS1-1

What cacn you ONLY change to balance chemical reactions?

• Subscripts

• Superscripts

• Coefficients