In an internal combustion engine, platinum speeds up the oxidation of carbon monoxide to carbon dioxide. platinum is needed for the reaction, but is not used up in the reaction. how does platinum increase the rate of the reaction? thinking either c or d a. it raises the temperature. b. it agitates the gases. c. it acts as a catalyst. d. it increases the pressure.

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.