3. a. In Part C of this lab, you will measure the mass of several different item

Question

3. a. In Part C of this lab, you will measure the mass of several different items, in grams (g). What are the two types of balances you will use to measure mass? b. An empty beaker has a measured mass of 29.456 g. When some salt is added to the beaker, the combined mass is 36.176 grams. Calculate the mass of the salt only (show work), reporting your answer to the correct number of significant figures. 4. In Part D of this lab, you will measure the melting point of an unknown solid, in degrees Celsius (C). a. Define "melting point" Is melting point a physical or chemical property of matter? A student measures the melting point of an unknown compound to be 53.5 °C. She later discovers that the compound is chlorothymol, with a true melting point of 58.8 . Calculate her percent error (show work) to the correct number of significant figures. The required formula is on page 3 of the Procedure document. b. c. You will use a variety of equipment to measure the melting point of the solid. Sketch a set-up of the equipment on the back of this page, and label all items in your sketch. d.

Explanation / Answer

3.

(a)

SImple balance

Analytical balance

Electronic balance

(b)

Mass of salt = 36.176 - 29.456 = 6.720 g.

4.

(a) Melting point : - The temperature at which the vapour pressure of solid phase and liquid phase are equal is called the melting point.

(OR)

The temperature where the solid gets converted into liquid is called melting point.

(b)

Melting point is a physical property becuase it involes only in change in physical state and no change in chemical composition.

(c)

% error = ( 58.8 - 53.5 ) * 100 / 58.8 = 5.3 * 100 / 58.8 = 9.0 %

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