Answer:
D
Explanation:
Because the other answers can not to be considered to be chemical properties.
Chemical means that the after the reaction the checal properties have changed in a way that it can no longer be called the same ad befor. In short, it can not be undone.
Burning a match is irriversable, meaning you can never go back to the previous situation because the chemical compounds have changed (dramatically).
Melted ice can be frozen again. Steam (evaporated water) can condensate to water which can be heated and can boil again. The chemical contents remain H2O.
I think it’s B.
I might be wrong, I’m just kinda going off based a little research and it says that it only happens in reptiles and teleost fish. The only option on there that’s related to it is the leatherback turtle.
The carbon atom in coal becomes carbon dioxide when it is burned. the carbon atom changes from a solid structure to a gas but it’s mass doesn’t change.
Answer:
The half-life of Plutonium 239 (Pu 239) is 24,100 years.
Explanation:
Half-life is the time required for a quantity to reduce to half of its initial value. This means that in 241000 years, 100g of Pu 239 would be reduced to 50g.