Grade 8 Chemistry Calculations Worksheet
This worksheet focuses on fundamental chemistry calculations for Grade 8 students, including atomic mass, molecular mass, and balancing simple equations.
Includes
Standards
Chemistry Calculations
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Date:
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Read each question carefully and show all your work. Use the provided atomic masses where needed: H=1, C=12, O=16, Na=23, Cl=35, S=32.
1. What is the atomic mass of oxygen (O)?
8 amu
16 amu
1 amu
12 amu
2. Which of the following is a balanced chemical equation?
H₂ + O₂ → H₂O
CH₄ + O₂ → CO₂ + H₂O
2Na + Cl₂ → 2NaCl
N₂ + H₂ → NH₃
3. The total mass of the reactants in a chemical reaction must equal the total mass of the .
4. The number of atoms of each element must be on both sides of a chemical equation.
5. Calculate the molecular mass of water (H₂O). Show your work.
6. Balance the following chemical equation: H₂ + O₂ → H₂O
Match the term with its definition.
7. Reactants
a. Substances formed in a chemical reaction
8. Products
b. Substances present at the start of a chemical reaction
9. A coefficient in a chemical equation indicates the number of atoms in a molecule.
True
False