Answer:
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical changes involve only a rearrangement of electrons.
Explanation: Hope this helps
Brainliest?
B:Molecules must collide.
Why: They have to collide so the chemical bonds can break.
Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. Mercury(II) oxide is a red solid. When it is heated, it decomposes into mercury metal and oxygen gas. A reaction is also considered to be a decomposition reaction even when one or more of the products are still compounds.
Primary consumers eat plants, which are producers. Producers are essentially he beginning of the food chain. Secondary consumers eat primary consumers. This means that organisms who are both primary and secondary consumers are omnivores. In this case, Organism A is a carnivore, Organism B is an omnivore, Organism C is an omnivore, and Organism D is an omnivore. The difference between Organisms C and D is that Organisms C eat insects, which are primary consumers, whereas Organism D eats fish, which are secondary consumers.
Answer: C and D
Hope this helps!
Nitrogen becomes a liquid at 20 degrees celsius
