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How To Solve a Word Problem in Chemistry. Step 1. Take a deep breath and relax. Step 2. . Determine and mark what is asked for in your problem make sure to include units.

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step 1
Step 1.
  • Take a deep breath and relax.
step 2
Step 2.

Determine and mark what is asked for in your problem make sure to include units.

  • A piece of copper is placed in a graduated cylinder containing some water. The total volume of the water increases by 7.43 mL. What is the mass of the piece of copper in grams (density = 8.92 g/cm3)?
  • Question: What is the mass of the piece of copper (g)?
step 3
Step 3.

Identify and write down all givens and units given in the problem.

  • A piece of copper is placed in a graduated cylinder containing some water. The total volume of the water increases by 7.43 mL. What is the mass of the piece of copper in grams (density = 8.92 g/cm3)?
  • Question: What is the mass of the piece of copper?
  • Givens : 1) Total water volume increases = 7.43 mL

2) Density of Copper = 8.92 g/ cm3

step 4
Step 4.

Write down the Givens for the problem.

  • A piece of copper is placed in a graduated cylinder containing some water. The total volume of the water increases by 7.43 mL. What is the mass of the piece of copper in grams(density = 8.92 g/cm3)?
  • Question : What is the mass of the piece of copper?
  • Givens : 1) Total water volume increases = 7.43 mL

2) Density of Copper = 8.92 g/cm3

step 5
Step 5.

Find the equation necessary to solve the problem.

  • A piece of copper is placed in a graduated cylinder containing some water. The total volume of the water increases by 7.43 mL. What is the mass of the piece of copper in grams (density = 8.92 g/cm3)?
  • Question: What is the mass of the piece of copper?
  • Givens : 1) Total water volume increases = 7.43 mL

2) Density of Copper = 8.92 g/cm3

  • Equation : 1) Density (g/cm3) * Volume (mL) = Mass (g)
step 6
Step 6.

Check All Units

  • Equation : 1) Density (g/cm3) * Volume (mL) = Mass (g)
  • Unit Check: 1) cm3 is not the same unit as mL.
  • Conversion: 1) 1 mL = 1 cm3 ; 7.43 mL = 7.43 cm3
step 7
Step 7.

Put the variables in and solve the equation.

  • Solution: 8.92 (g/cm3) * 7.43 (cm3) = Mass (g)
  • Answer : Mass (g) = 66.3 (g)
step 8
Step 8.
  • Recheck to determine if the units are the same as the problem and the answer seems reasonable.
  • Recheck of units : Desired unit (gram) = Answer (grams)
slide10
A piece of copper is placed in a graduated cylinder containing some water. The total volume of the water increases by 7.43 mL. What is the mass of the piece of copper in grams (density = 8.92 g/cm3)?
  • Question : What is the mass of the piece of copper?
  • Givens : 1) Total water volume increases = 7.43 mL

2) Density of Copper = 8.92 g/cm3

  • Equation : 1) Density (g/cm3) * Volume (mL) = Mass (g)
  • Unit Check : 1) cm3 is not the same unit as mL.
  • Conversion : 1) 1 mL = 1 cm3 ; 7.43 mL = 7.43 cm3
  • Solution : 1) 8.92 (g/cm3) * 7.43 (cm3) = Mass (g)
  • Answer : Mass (g) = 66.3 (g)
  • Recheck of units : Desired unit (gram) = Answer (grams)