Which of the following is an example of a qualitative measurement? a) blue crystal b) 2 moles of carbon atoms c) 10 g of salt d) 12 dl. of water

A) blue crystal

Explanation:

Qualitative measurements measure the quality of something as opposed to quantity. The other options are quantitative as they contain numbers.

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.