How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred

These test tubes contain solutions of various colors, since they have been mixed with broth from red cabbage. The approximate pH values are noted.

One liter of air contains about 0.21 L of oxygen. When filled, the human lungs hold about 6.0 L of air. How much oxygen is in the lungs when they are filled with air? (Round off to the nearest hundredths place.)

Camphor is reduced to isoborneol by sodium borohydride in ethanol. The instructions for safe disposal of the chemical waste generated by this reaction state that the lids should not be screwed back onto the waste containers.

80.0 liters of oxygen is collected over water at 50.0°C. The atmospheric pressure in the room is 96.00 kPa. What is the partial pressure of the oxygen?

A sample of oxygen gas has a volume of 5.60 l at 27°c and 800.0 torr. how many oxygen molecules does it contain?

320.93 - (6109.7/2.3) Express your answer to the appropriate number of significant digits.

The osmotic pressure is found to depend on the concentration of the solution. What way, directly or inversely

The following reaction was monitored as a function of time: AB-->A+B A plot of 1/AB versus time yields a straight line with slope 5.5 * 10^-2 (M? s) ^-1. What is the half-life when the initial concentration is 0.

The science student wants to find the mass of a wooden block. What is its appropriate name and use of the equipment

What should be done if a chemical is poured from an original container into another container not intended for immediate use?