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CHEM 121 pre-lab - Speech or Presentation Example

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CHEM 121 pre-lab

(Hints: volume = area x thickness. 1 mL = 1 cm3) Express your answer in cm2 and in miles2.
7. Let’s assume that your secondary education has led you to rob armored cars. In your latest heist, if you were faced with bags of coins that weighed the same, which bag would you take: pennies, nickels, dimes, or quarters? Which bag contains more money? Important data: a penny weighs 3.09 g, a nickel weighs 4.88 g, a dime weighs 2.25 g, and a quarter weighs 5.68 g. (Naturally, show your work for full credit.) Hint: calculate the monetary density of each coin.
Clearly monetary density of dimes is the highest and therefore, I would take the bag containing dimes as it contains more money. However, if I can afford to take one more bag I will not like to leave the quarters bag as well.
8. What would be the effect on your calculated value of the density of water if there was an air bubble in the pipet when you transferred the water into the empty vial? Would the value be higher or lower or would there be no change? Explain your answer
If there was an air bubble in the pipet while transferring the water in the vial for density measurement, the measured value of density will be lower than the actual value as the volume has been measured on higher side erroneously due to entrapped air bubble.
9. What would be the effect on your calculated value of the density of water if “empty” vial had not been completely dried before weighing? Would the value be higher or lower or would there be no change? Explain your answer
The measured value of density of water will not be affected in this case as the mass of empty vial is deducted to calculate the mass of the measured volume of water. Therefore, whether the vial was completely dry or not will not affect the ...Show more


For word problems: Use good scientific expression. Make your sentences short and clear. Neatness counts, as does spelling. Show your work for numerical problems. If the answer is very large or very…
Author : ephraim45
CHEM 121 pre-lab
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