Chemistry 101

Assignment: June 26

Page 27

(1.6) Which of the following changes can be reserved by changing the

temperature (that is, which are physical changes): (a) dew condensing on a

leaf; (b) an egg turning hard when it is boiled; (c) ice cream melting; (d) a

spoonful of batter cooking on a hot griddle?

(1.21) The average radius of a molecule of lysozyme, an enzyme in tears, is 1430

pm. What is its radius in nanometers (nm)?

(1.29) An empty vial weighs 55.32 g. (a) if the vial weighs 185.56 g when filled

with liquid mercury (d = 13.53 g/cm3), what is its volume? (b) How much

would the vial weigh if it were filled with water (d = 0.997 g/cm3 at 25oC) ?

(1.31) A small cube of aluminum measures 15.6 mm on a side and weighs 10.25 g.

What is the density of aluminum in g/cm3?

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