Our atmosphere is composed of several gases. The name of the gas we breathe, O2, is

I) Distinguish a substance from a mixture. Give 2 examples of each

Which structures are found in both prokaryotic cells and eukaryotic cells? Choose all answers that are correct. A. cytoplasm B. flagella C. pili D. plasma membrane E. ribosomes

Must new substance before when you have a chemical property

When can a hypothesis be elevated to the status of a theory? a) when it is validated by an experiment b) when data gathered from an experiment precisely fits predictions c) when it can be proved to be true d) when it meets the test of repeated

How do scientific law differ from scientific theory

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

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.