Which of these statements is not true about chemical reaction rates?

A. The reaction rates can change.

B. The reaction rates can increase.

C. The reaction rates can decrease.

D. The reaction rates are always constant.

Which combination of atoms can form a polar covalent bond?

Explain what air is, where on Earth it occurs, and how it moves to create wind.

Define ionic bond, covalent bond, hydrogen bond, molecular weight, and mole

If I leave 750 mL of 0.75 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be? M1V1 = M2V2

Can you use a 100-ml graduated cylinder to measure the approximately 200-ml water portions?

Molar mass of Fe2 (CO3) 3

If you put a straw into a glass of water, the straw looks to be bent, although nothing has physically happened to the straw. The term that describes this property of light is A) absorption. B) diffraction. C) reflection. D) refraction.

A constant volume of gas is heated from 25.0ºC to 150.ºC. If the initial pressure was 760. torr, what is the final pressure?

The concentration of 1130 + in a solution is found to be 1.75 X 10-8 M 250C. Find [OH].

W Which are forms of kinetic energy? A light, sound, chemical B electrical, chemical, sound C sound, potential, thermal D light, thermal, sound