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How To Solve a Word Problem in Chemistry

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

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  1. How To Solve a Word Problem in Chemistry

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

  3. 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)?

  4. 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

  5. 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

  6. 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)

  7. 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

  8. 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)

  9. 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)

  10. 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)

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