What element is found in liver and red blood cells and is needed to prevent anemia

Who wasthe first person who suggested that matter was made up of atoms

True or false? Steel is a chemical element.

What do scientists call organisms, such as plants, which make their own food?

Compare the energies of the particle beams created by the tevatron and the lhc.

Given a balanced chemical equation below: 3Cu (s) + 2H3PO4 - - - > Cu3 (PO4) 2 + 3H2 How many moles of copper are needed to react with 5 moles of phosphoric acid?

What is the number of moles of 27.6g of lithium?

Air is transferred from a 75 L tank where the pressure is 125 psi and the temperture is 288 k to a tire with a volume of 6.1 L and a pressure of 25 psi. What is the new temperture.

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes