If an element has 4 protons and 5 neutrons its mass number is

An effusion container is filled with 7 L of an unknown gas. It takes 109 s for the gas to effuse into a vacuum. From the same container under the same conditions--same temperature and initial pressure, it takes 380 s for 7.00 L of O2 gas to effuse.

In fission, large nuclei split apart and release energy. In fusion, smaller nuclei join together and release energy. Fission and fusion both produce what kind of energy?

What does DNA instructions for making what

Which state of matter would be described as having highly energized, charged particles that move extremely fast

What volume of nitrogen is needed to produce 250.0 L of ammonia gas at STP?

Normal cellular pH has a hydrogen concentration of 3.98 x 10-8 M. what is the pH of a cell

What is evaporation? Describe what happens at the molecular level during evaporation.

Write is the chemical formula for calcium and chlorine

Using EDTA as the titrant and a free metal in solution is called a direct titration. This can be measured using an indicator that changes color when the metal is no longer in solution.

What is the relative formula mass for ammonium sulphate