Here's the solution to all 6 problems on the
Chem Skills Worksheet #10: Percent Error, with step-by-step explanations.
---
🔢 Formula Reminder:
Percent Error = |(Accepted Value – Experimental Value)| / Accepted Value × 100%
We always take the
absolute value of the difference to ensure a positive percent error.
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##
✔ Problem 1:
> Student’s experimental density of aluminum =
2.850 g/cm³
> Accepted value =
2.699 g/cm³
Calculation:
|2.699 – 2.850| / 2.699 × 100%
= |–0.151| / 2.699 × 100%
= 0.151 / 2.699 × 100%
≈
5.59%
✔ Answer: 5.59% *(Already filled in correctly)*
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##
✔ Problem 2:
> Experimental specific heat of water =
4.29 J/g°C
> Accepted value =
4.18 J/g°C
Calculation:
|4.18 – 4.29| / 4.18 × 100%
= |–0.11| / 4.18 × 100%
= 0.11 / 4.18 × 100%
≈
2.63%
✔ Answer: 2.63%
---
##
✔ Problem 3:
> Accepted mass =
200.0 g
> Experimental mass =
196.5 g
Calculation:
|200.0 – 196.5| / 200.0 × 100%
= 3.5 / 200.0 × 100%
=
1.75%
✔ Answer: 1.75% *(Already filled in correctly)*
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##
✔ Problem 4:
> Experimental boiling point =
102.0°C
> Accepted boiling point =
100.0°C
Calculation:
|100.0 – 102.0| / 100.0 × 100%
= 2.0 / 100.0 × 100%
=
2.00%
✔ Answer: 2.00%
---
##
✔ Problem 5:
> Experimental melting point =
51.0°C
> Accepted melting point =
53.0°C
Calculation:
|53.0 – 51.0| / 53.0 × 100%
= 2.0 / 53.0 × 100%
≈
3.77% → Rounded to
3.8%
✔ Answer: 3.8% *(Already filled in correctly)*
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##
✔ Problem 6:
> Experimental density of copper =
8.37 g/cm³
> Accepted density of copper =
8.92 g/cm³
Calculation:
|8.92 – 8.37| / 8.92 × 100%
= 0.55 / 8.92 × 100%
≈
6.17%
✔ Answer: 6.17%
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## 📝 Final Answers Summary:
1.
5.59%
2.
2.63%
3.
1.75%
4.
2.00%
5.
3.8%
6.
6.17%
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✔ All answers are calculated using the standard percent error formula, ensuring absolute value and proper rounding where appropriate. Let me know if you’d like these explained further or visualized!
Parent Tip: Review the logic above to help your child master the concept of percent error worksheet with answers.
