Chemical Molecules and Reactions

A molecule made of 2 atoms is called a ____________________.

• Diatomic Molecule
• Chemical Bond
• Product
• Reactant

Tags

NGSS.MS-PS1-1

Which of the following is a compound?

• Co
• O₂
• C
• CO₂

Tags

NGSS.MS-PS1-1

What are the reactants in the chemical equation pictured?

• CH₄ and CO₂
• CH₄ and O₂
• CO₂ and H₂O
• O₂ and H₂O

What are the products of the chemical reaction pictured?

• CH₄ and CO₂
• CH₄ and O₂
• CO₂ and H₂O
• O₂ and H₂O

According to the law of conservation of mass:

• sometimes atoms are lost
• sometimes atoms are gained
• atoms are never lost nor gained
• atoms are lost and gained

Tags

NGSS.HS-PS1-7

The blue numbers in the image represent __________.

• charges
• coefficients
• subscripts
• none of the answers are correct

The red numbers in the image represent ____________.

• subscripts
• coefficients
• charges
• None of the answers are correct

Is the following equation balanced? If not, choose the correctly balanced equation.
Fe + S --> FeS

• It is balanced.
• It is not balanced, it should be
  2Fe + S --> FeS
• It is not balanced, it should be
  2Fe + 2S --> 2FeS
• It is not balanced, it should be
  3Fe + 2S --> 1FeS

Tags

NGSS.HS-PS1-7

Balance this equation...
H₂ + Cl₂ --> HCl

• It is balanced 
• 3H₂ + Cl_{2 -->} 6H₂Cl
• H₂ + Cl_{2 -->} 2HCl
• 2H₂ + 2Cl_2 --> 4HCl

Tags

NGSS.HS-PS1-7

Which of the following reactions is correctly balanced?

• 2CH₄ + O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + 2H₂O
• None of the chemical equations are balanced.

Tags

NGSS.HS-PS1-7