Blood has a ph of 7.35 to 7.45. gastric juice has a ph of about 2.0. the

A chemical reaction gives off 1,500 kJ of heat energy. About how many calories is this? (1 calorie = 4.18 Joules)

Which of the following elements would be considered a nonmetal? fluorine (#9) silicon (#14) cobalt (#27) sodium (#11)

The reactants in a chemical reaction contain 900 J of chemical energy. The products of the reaction contain 9000 J of chemical energy.

You are asked to prepare a ph = 4.00 buffer starting from 1.50 l of 0.0200 m solution of benzoic acid (c6h5cooh and some added sodium benzoate salt (c6h5coona. a find the ph of the benzoic acid solution before adding the salt.

An ice cube at 0.00 ∘C∘C with a mass of 21.5 gg is placed into 500.0 gg of water, initially at 31.0 ∘C∘C, in an insulated container.

How many grams of water are needed to react with 485 g of calcium carbide

Water molecules have a strong attraction to each other because of hydrogen bonding, allowing water to move against gravity up a plant's stem through capillary action. True False

What happens when an electric field is applied to a very polar molecule?

Which particles have approximately the same mass?

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect