2.570 kilograms in standard form

2.57 kilograms = 2570 grams

Explanation:

Remember that there are 1000 grams in 1 kilogram.

Multiply 1000 grams with 2.570 kilograms

1000 x 2.570 = 2570

2570 grams are in 1 kilogram

hope this helps

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.