Grade 7 Chemistry Calculations
A worksheet for 7th graders to practice fundamental chemistry calculations including balancing equations, molar mass, and concentration.
Includes
Standards
Grade 7 Chemistry Calculations
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Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
Balance the following chemical equations by filling in the missing coefficients.
1. H₂ + O₂ → H₂O
2. Fe + O₂ → Fe₂O₃
3. CH₄ + O₂ → CO₂ + H₂O
Calculate the molar mass for the following compounds. Use the provided atomic masses: H=1, C=12, O=16, Na=23, Cl=35.5
4. Water (H₂O)
5. Sodium Chloride (NaCl)
6. Which of the following best describes the concentration of a solution?
The total volume of the solvent.
The amount of solute dissolved in a given amount of solvent or solution.
The color of the solution.
The density of the solute.
7. A chemist measures the mass of a substance using a triple beam balance shown below. If the readings are 100g, 50g, and 3.5g, what is the total mass of the substance?
Indicate whether each statement is True or False.
8. In a balanced chemical equation, the number of atoms of each element is the same on both sides of the equation.
True
False
9. Molar mass is the mass of one gram of a substance.
True
False
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