The graph below plots the temperature and luminosity of stars on the main sequence. Which of these stars had an initial mass greater than the initial mass of the sun? Star 1 and Star 2
Star 3 and Star 4
Star 1 and Star 4
Star 2 and Star 3

Does the temperature affect the solubility of sugar and salt in water? if it does tell me like different temperatures with different solubilities so i can sketch down a graph

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.