What do we call atoms of the same elements with different mass numbers?

1) which of the following is the general equation for a synthesis reaction? A) AB->A+B B) A+B->AB C) A+BC->B+AC D) AB+CD-> AD+BC 2) which of the following takes place during a redox reaction? A) Electrons are gained only. B) Electrons are lost only.

What is the proper scientific notation for 0.000476? a. 0.476 * 10-3 b. 4.76 * 10-4 c. 47.6 * 10-5 d. 476 * 10-6

What is the mass of 5.05*1021 platinum atoms?

If a sample gas is collected over water. The atmospheric pressure is 778 mm and the temperature is 30°C. If the vapor pressure of water at 30 C is 31.8 mm, what is the pressure of the gas?

Which action would speed up a chemical reaction in aqueous solution? adding more powdered reactants adding excess cold water removing a catalyst cooling the reaction mixture

Match the following items. 1. balance observation using "how much". 2. graduated cylinder primary unit of mass. 3. hypothesis proposed explanation. 4. L unit of volume. 5. quantitative instrument of volume. 6. kg instrument of mass. 7.

Which is the best description of a scientific theory? a. a statement about how two different variables are related b. a collection of laws that are explained the same way c. an explanation of many observations and tested hypotheses d.

How would the electrons produced in a cathode ray tube filled with neon compare with the electrons produced in a cathode ray tube filled with chlorine gas?

Energy released from cell respiration is know as

What is a neutral atoms oxidation number