What is the density of the table tennis ball? Record your answer to the nearest hundredth.
g/cm3
Calculate the density of each ball. Use the formula
D= m/V
where D is the density, m is the mass, and V is the
volume. Record your calculations in Table A of your
Student Guide
Given that the density of water is 1.0 g/cm3, make a
prediction about whether each ball will float in water.
Record your prediction in Table A.
What is the density of the golf ball? Record your
answer to the nearest hundredth.
g/cm3

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0