Approximately for which year did Aristotle mention the theory of the 4 elements?

what is the number of protons neutrons and electrons in an ion with atomic number 53 mass number 108 and a charge of - 1

A decomposition reaction, with a rate that is observed to slow down as the reaction proceeds, has a half-life that does not depend on the initial concentration of the reactant.

A potato chip burned and gave off enough energy to heat up 0.5 kg of water from 20oC to 25o. The specific heat of water is 4,184 J/kgoC.

The mass of a single gold atom is 3.27*10-22 grams. How many gold atoms would there be in 70.6 milligrams of gold?

Magnesium has 12 electrons arranged in three energy levels. The outer level has two electrons. In order to become stable, the atom loses two electrons thus exposing the previous level with 8 electrons and subsequently becomes an ion withA.

Name 4 common chemical properties of matter

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.

Give reasons 1) copper utensils and sheets become blackish after some days

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).