Asked by mani
Question 9 (1 point)
Instructions:
1. Review how to read a graduated cylinder to find the volume of each liquid.
2. Find the mass of each object (Density x volume = mass)
3. Match each liquid below.
1340470
Column A
1.
Unknown 1:
Unknown 1
2.
Unknown 2:
Unknown 2
3.
Unknown 3:
Unknown 3
4.
Unknown 4:
Unknown 4
Column B
a.Methanol
b.Syrup
c.Ethanol
d.Glycerin
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All Answers 1
Answered by
GPT-5 mini
AI
I don't see the graduated-cylinder readings or any measured masses in your question, so I can't match the four unknowns to the four liquids yet. I can, however, give the exact steps and the density values you need and show one example calculation so you can finish the matching — or paste the four cylinder readings here and I will do the calculations for you.
Steps to identify each unknown liquid
1. Read each graduated cylinder at the bottom of the meniscus at eye level. Record the volume (final reading minus initial reading if you poured into a cylinder that already had liquid).
2. Use mass = density × volume to compute the expected mass of each liquid. Make sure your volume is in mL (1 mL = 1 cm^3) and density is in g/mL so the mass comes out in grams.
3. Compare the calculated masses (or densities computed from measured mass/volume if you measured mass) to the known densities of the candidate liquids to match each unknown.
Typical densities at ~20 °C (use the value appropriate to your lab or instructions if given)
- Methanol: ≈ 0.79–0.79 g/mL (commonly 0.791 g/mL)
- Ethanol: ≈ 0.789 g/mL
- Glycerin (glycerol): ≈ 1.26 g/mL
- Syrup (sugar/corn syrup — approximate): ≈ 1.30–1.38 g/mL (use the value your lab gives; syrup is much denser than water)
Example
- If Unknown 1 volume = 25.0 mL and you compute mass = density × volume using the glycerin density 1.26 g/mL: mass = 1.26 g/mL × 25.0 mL = 31.5 g. If your measured mass is ~31.5 g, Unknown 1 is glycerin.
Send the four graduated-cylinder readings (and measured masses if you have them) and I will compute the masses and match each unknown to: a) Methanol, b) Syrup, c) Ethanol, d) Glycerin.
Steps to identify each unknown liquid
1. Read each graduated cylinder at the bottom of the meniscus at eye level. Record the volume (final reading minus initial reading if you poured into a cylinder that already had liquid).
2. Use mass = density × volume to compute the expected mass of each liquid. Make sure your volume is in mL (1 mL = 1 cm^3) and density is in g/mL so the mass comes out in grams.
3. Compare the calculated masses (or densities computed from measured mass/volume if you measured mass) to the known densities of the candidate liquids to match each unknown.
Typical densities at ~20 °C (use the value appropriate to your lab or instructions if given)
- Methanol: ≈ 0.79–0.79 g/mL (commonly 0.791 g/mL)
- Ethanol: ≈ 0.789 g/mL
- Glycerin (glycerol): ≈ 1.26 g/mL
- Syrup (sugar/corn syrup — approximate): ≈ 1.30–1.38 g/mL (use the value your lab gives; syrup is much denser than water)
Example
- If Unknown 1 volume = 25.0 mL and you compute mass = density × volume using the glycerin density 1.26 g/mL: mass = 1.26 g/mL × 25.0 mL = 31.5 g. If your measured mass is ~31.5 g, Unknown 1 is glycerin.
Send the four graduated-cylinder readings (and measured masses if you have them) and I will compute the masses and match each unknown to: a) Methanol, b) Syrup, c) Ethanol, d) Glycerin.
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