8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Parts per Million 4 questions
Parts per Million
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
Mass ppm is (mass of solute ÷ mass of solution) × 106. Use the same mass units in the numerator and denominator. One kilogram is 1,000,000 milligrams.
Question 1
Which measurement is equivalent to 3 ppm by mass?
- 3 mg solute per 1 kg solution
- 3 g solute per 1 kg solution
- 3 mg solute per 1 g solution
- 3 kg solute per 1 kg solution
Question 2
A 2.00 kg solution contains 6.00 mg of a dissolved substance. Calculate its mass concentration in ppm.
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Question 3
Which mass belongs in the denominator of the mass-ppm ratio?
- Mass of solvent before mixing
- Total mass of the solution
- Mass of solute
- Mass of the empty container
Question 4
A report gives the concentration of a liquid sample in mg/L. Explain what additional quantity is needed to convert exactly to mg/kg for that sample.
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Model Screening Records 4 questions
Model Screening Records
Use the information below to answer the questions.
A class compares modeled samples containing the same dissolved dye. The recorded solution masses include the dye.
| Sample | Dye mass (mg) | Solution mass (kg) |
|---|---|---|
| P | 2.4 | 0.80 |
| Q | 3.6 | 0.90 |
| R | 4.8 | 1.60 |
Question 5
Which sample has the highest dye concentration in ppm?
- P
- Q
- R
- All three are equal.
Question 6
Show that P and R have the same mass concentration even though they contain different dye masses.
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Question 7
Which sample exceeds a model screening limit of 3.5 ppm?
- P
- Q
- R
- P and R
Question 8
A student takes half the mass of well-mixed sample Q. Describe what happens to the mass of dye and the dye concentration in the portion.
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