Which of the following is an element?

• FeO
• O₂
• NaOH
• SiO₂

Which of the following is a compound?

• Ca
• Pb
• H₂
• MgBr

How many elements are in the compound C₂H₈O ?

• 2
• 1
• 3
• 0

Tags

NGSS.MS-PS1-1

How many total atoms are in the compound H₂SO_4?

• 6
• 5
• 7
• 3

Tags

NGSS.MS-PS1-1

Which one of the following compounds is organic?

• H₂O
• CaCu₃
• C₆H₁₂O₆
• H₂Cl₃

How many Sodium atoms are in the compound 6NaCl?

• 1
• 12
• 6
• 4

How many Carbon atoms are on the product side of this chemical equation?            
2C₂H₂ + 5O₂  --->  4CO₂ + 2H₂O

• 2
• 3
• 4
• 5

Tags

NGSS.MS-PS1-5

How many Hydrogen atoms are on the reactant side of this chemical equation?            
2C₂H₂ + 5O₂  --->  4CO₂ + 2H₂O

• 2
• 4
• 6
• 8

Does this chemical equation follow the Law of Conservation of Mass? (Hint: Is it balanced?)       
2C₂H₂  +  5O₂ ---> 4CO₂  +  2H₂O 

• No
• Yes
• maybe
• huh?

According to the Law of Conservation of Mass, –

• matter is not created or destroyed in a chemical reaction.
• matter is always created in a chemical reaction.
• matter is always destroyed in a chemical reaction.
• matter is created and then destroyed in a chemical reaction.