Consider a sample of helium gas in a container fitted with a piston as pictured below. the piston is frictionless, but has a mass of 10.0 kg. how many of the following processes will cause the piston to move away from the base and decrease the pressure of the gas? assume ideal behavior.
i. heating the helium.
ii. removing some of the helium from the container.
iii. turning the container on its side.
iv. decreasing the pressure outside the container.
a) 0
b) 1
c) 2
d) 3
e) 4

If a reaction has g of -136kj at 110°c, will it be spontaneous at this temperature (110°c)? yes or no

The following reaction shows the products when sulfuric acid and aluminum hydroxide react. al(oh)3 + h2so4 → al2(so4)3 + h2o the table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory. initial mass and yield sulfuric acid aluminum hydroxide initial amount of reactant 40 g 15 g theoretical yield of water from reactant 14.69 g 10.38 g what is the approximate amount of the leftover reactant? 11.73 g of sulfuric acid 10.33 g of sulfuric acid 11.12 g of aluminum hydroxide 13.67 g of aluminum hydroxide

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.