Caleb is an inventor who has designed a new kind of fishing net. he is looking for a strong, flexible material that can be used to hold a lot of weight and will not dissolve in water. he wants a synthetic material so he does not have to depend on harvesting a natural product. which material would be best for caleb’s invention? cellulose nylon polystyrene vulcanized rubber

Diamond will scratch quartz. true or false

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.

Two solutions of the same uv-absorbing molecule were analyzed by uv-vis spectroscopy on the same instrument using 1 cm pathlength cells. use data from the table to calculate by what percentage the concentration of solution b is compared to that of solution a. sample absorbance at 315nm a 0.45 b 0.80