4. How many moles of molecules are there in 500g of sodium chloride? a) 5.6 mol b) 8.5 mol c) 0.67 mol d) 3 mol
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Write two balanced equations 1. dissolving of solid sodium hydroxide in water 2. the reaction of sodium hydroxide solution with hydrochloric acid

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Stage in which a typical star has completely stopped fusion