Chemical Equations Practice

Which drawing below represents this chemical formula?

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Which drawing below represents this chemical formula?

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Tags

NGSS.MS-PS1-1

Is this equation balanced?

• yes

• no

Tags

NGSS.HS-PS1-7

Is this equation balanced?

• yes

• no

Tags

NGSS.HS-PS1-7

4 molecules of Hydrogen Gas (H₂) react with 2 molecules of Oxygen Gas (O₂) to make some Water (H₂O). How many molecules of water will this reaction make?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

Which equation below is balanced?

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Tags

NGSS.HS-PS1-7

Which of the following statements is TRUE about the equation below?

• The equation IS balanced because there are 2 atoms of Nitrogen and 5 atoms of Hydrogen on each side of the equation.

• The equation is NOT balanced because there are 6 atoms of Hydrogen in the reactants, but only 3 atoms of Hydrogen in the products.

• The equation IS balanced because there are 2 atoms of Nitrogen and 6 atoms of Hydrogen on each side of the equation.

• The equation is NOT balanced because there are 5 atoms of Hydrogen in the reactants, but only 3 atoms of Hydrogen in the products.

Tags

NGSS.HS-PS1-7

In chemical reactions, what does the law of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Tags

NGSS.HS-PS1-7

6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

What are the reactant(s) in this equation?

• CO₂ and H₂O

• C₆H₁₂O₆ and O₂

• H₂O and C₆H₁₂O₆

• CO₂ and O₂

Tags

NGSS.HS-LS2-5

Zn + 2 HCl → H₂ + ZnCl₂

If you have 5 atoms of Zn, and 10 molecules of HCl in the reactants, how many atoms of Zn will you have in the products?

• 5

• 10

• 15

• 50

Tags

NGSS.HS-PS1-7