Question 19 of 25 What is true about hypotheses?
A. They are types of scientific questions.
B. They are based on prior knowledge or observations.
C. Experiments always prove that they are correct.
D. They are the solutions to technological problems,

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

Find the mass in grams of 1.37x1020 particles of h3po4

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume