I’m working on a chemistry question and need a sample draft to help me learn.

Experiment 1

• weigh DRY pennies– tare the weigh paper — use analytical balances
• Check the pennies you use to make sure they fall into the correct date range before each trial. Then, KEEP TRACK of the pennies so they REMAIN sorted by date, by placing them into correctly labeled bags.
• Measure the volume using a 50 mL cylinder. Don’t forget to write the decimal places on your measurement, especially if there is a 0.
• Repeat for 2 trials each– pre- and post- 1983 pennies. Run the first trial all the way through before starting the second trial.
• In your calculations, report an EXTRA significant digit in your density. (Underline the last sig fig, and keep one extra.) This will include your measured values in the average, keeping your average as accurate as possible. Only round once, at the very end.
• To work in pairs, I suggest having one person run one set of pennies and the other person run the other set of pennies. Then you can share data after the trials are complete.

Question 1

For Part A, you will measure the volume of a small stack of pennies using volume by displacement (or water displacement), one of the methods used in Experiment 1. Briefly describe how you will use a 50 mL graduated cylinder and water to measure the volume of pennies by displacement. (In your notebook, consider sketching the graduated cylinder and water before and after the pennies are added.)

List the measurements you will make and how they will be used to calculate the volume of pennies.

Question 2

Consider the data shown below for a rectangular metal sample. A student used an analytical balance and a centimeter ruler marked to every 0.1 cm, and recorded the following:

Table 1: Experimental Measurements

a. Calculate the density of the metal sample, expressing the final answer with the correct significant figures in the first box, and correct units in the second box. (Use the ^ symbol to indicate a unit raised to a power. For example, x² would be entered as x^2.)

D =

b. There are two mistakes in this data, based on the type of instruments used to make the measurements. Identify the mistakes.

The mass is recorded incorrectly because .

The lengths are recorded incorrectly because:

Question 3

You will use a 50-mL graduated cylinder in this experiment to measure volume. Given that smallest marking on this graduated cylinder is 1 mL, circle all of the following sample measurements that are NOT appropriate or NOT recorded to the correct number of decimal places using a 50-mL graduated cylinder:

• 44.1 mL
• 32.5 mL
• 15.11 mL
• 15 mL