Is Vitamin E an element?

What was discovered by chemists after Mendeleevs periodic table was accepted

Bismuth-211 decays by emitting an alpha particle

If 500 ml of air contains 2 x 10^22 particles (Atoms and molecules), how many particles do you inhale in one day if you breath 15000 L of air? a. 2 x 10^22 b. 6 x 10^26 c. 1.2 x 10^27 d. 5 x 10^24

What is an experiment that can show gas being created?

A certain batch of fireflies were observed to "flash" at the rate of 13.0 times per minute at 25°C, and at the lower rate of 5.0 times a minute at a temperature of 15°C.

Flammable materials like alcohol should never be dispensed or used near True or False

The diagram to the right shows energy for two reactions, A and B. Which reaction has the higher Gpx?

To be considered a source of water pollution, the source must include a chemical.

2,000 kJ worth of heat is absorbs by each of the following objects. Which object will experience the smallest temperature change

How are real gases different from ideal gases?