You will observe temperature changes as various salts are dissolved in water and determine which of them would make the best heat pack.

you will be working with the following reagents and glassware: nacl, kcl, cacl2 (enough of each to fill ~1 cm in the bottom of a test tube), distilled water (enough to fill ~2 cm of bottom of test tube), 2 test tubes per salt, thermometer, glass stirring rod
using these materials, design experiments to determine which salts dissolve exothermically and which dissolve endothermically.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0