Question 6 (04.02 MC)

Two chemical reactions are shown:

A. Ca(OH)2 > CaO + H2O

B. 4K + O2 → 2K20

Which statement is true? (1 point)

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Akno3 solution containing 51 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?