Chemical Reactions and Balancing Chemical Equations

What is the coefficient of the oxygen molecule in the elephant toothpaste equation?
2 H₂O₂ -> 2 H₂O + O₂

• 0
• 1
• 2
• 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What do you call the substances on the left side of a chemical equation?

• yield
• products
• reactants
• compounds

Tags

NGSS.MS-PS1-1

Chose the correct labels for the parts of a chemical equation.

• reactants yield products
• reactants make compounds
• products equal reactants
• products yield reactants

Tags

NGSS.MS-PS1-2

Which is the correct atom count for the reactant side of the chemical equation?
CH₄ + 2 O₂ -> CO₂ + 2 H2O

• C=4
  H=4
  O=4
• C=1
  H=4
  O=2
• C=1
  H=4
  O=2
• C=1
  H=4
  O=4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Based on the diagram, what is the formula for hydrogen peroxide?

• H₂O₁₂
• H₂O₂
• H₄O₁₀
• there is no way to determine the formula

Tags

NGSS.MS-PS1-1

Which contains the greatest number of elements?

• 5CH₄
• Fe₂O₃
• C₆H₁₂O₆
• C₈H₁₀N₄O₂

Tags

NGSS.MS-PS1-1

Which contains the greatest number of atoms?

• 5CH₄
• Fe₂O₃
• C₆H₁₂O₆
• C₈H₁₀N₄O₂

Tags

NGSS.MS-PS1-1

How many compounds are shown in the equation for cellular respiration?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-LS1-7

How are chemical bonds formed?

• by sharing, giving, or taking electrons from another atom
• through radioactive decay
• by losing or gaining neutrons in the nucleus
• by exchanging protons with another atom

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is true of this chemical equation?

• it is balanced
• it is unbalanced
• it produces an organic substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5