How To Solve a Word Problem in Chemistry

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How To Solve a Word Problem in Chemistry - PowerPoint PPT Presentation

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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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.

• 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.

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.

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.

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.

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.

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.
• 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)
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)