Determine which classes of reactions would fit into each of the following categories for the reactants and products. Choices are decomposition, combination, single-displacement, double-displacement, and combustion.
Reactants
Products
(a) One compound One element and one compound
(b) Two compounds Two compounds
(c) Two compounds One compound

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Temperature is _related to the average kinetic energy of a gas. inversely directly not disproportionally

Plz mark brainliest 30 points1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s.2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?