What amount of heat is removed to lower the temperature of 80 grams of water from 75º C to 45º C? The specific heat of liquid water is 4.18 J/gº C.

A. - 10,000 J

B. 10,000 J

C. - 8,000 J

D. 8,000 J

What is the formula for sodium sulfide? a.) Na3S b.) NaS2 c.) NaS d.) Na2S

Which statement best describes how chemical equations demonstrate conservation of mass? A. The number of reactants is the same as the number of products. B. The compounds are the same on each side of the reaction. C.

1. The chemical symbol for sodium is

After what, the nucleus of the parent cell has divided into two new nuclei?

How would you prepare a 0.1M solution of HCl starting with a 1.0M solution? Assume you want to prepare 100 ml of solution.

The hydroxide ion concentration in pure water at 25ºC is NOT equal to A. the hydronium ion concentration. B. 1 X 10^-7 M. C. the hydroxide concentration in a solution with a pH of 7. D. 1 X 10^7 M.

1. Why do rings stay shiny?

Which technology collects data for weather, climate, and environmental monitoring from space? radar satellites weather stations weather balloons

Why is it important to perform the reagent tests last?

To what decimal place should each answer be rounded how many significant figures does the rounded answer have 9 cm + 2.8 cm = 11.8 cm