If Juan had a glass of milk and dissolved 20g of chocolate milk powder into the milk, by how much will the mass of the milk go up by?

20g or 0.2kg

Explanation:

this is because the mass of the powder is 20g and this will be added to the original mass of the milk causing it to increase by that amount

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §