What is the term for the amount of salts in water

The periodic table includes___periods.

Does my stomach expand like a balloon the more I eat or drink something

If a zebra weighs 390N what is its mass

List the following colors of visible light from lowest energy to highest energy: green, blue, yellow, red, violet.

A ray of light is incident on an unknown transparent substance from of incidence is 40°, and the angle of refraction is 22° (a) Explain why these measurements indicate that a change in speed must be happening as the light changes medium.

A man consumes 2245 kcal of food in one day, converting most of it to maintain body temperature. If he loses half this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate?

If an eagle and a bumblebee are traveling at 8km/hr which has more momentum?

For each case, identify the force (including its direction) that causes the acceleration. (a) A sprinter at the very start of the race.

Select the effects of radiation below that are stochastic: associated with short-term, high-level exposure associated with long-term, low-level exposure include cancer and other DNA mutation include burns and radiation sickness

On the modern periodic table, elements are ordered according to what?