Carbon has an atomic number of 6. How many electrons are in a carbon atom's second energy level?

The element hydrogen is made up of which kind (s) of atoms? A. only oxygen atoms B. only hydrogen atoms C. more hydrogen atoms than oxygen atoms D. more oxygen atoms than hydrogen atoms

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. +1 D. -2

A balloon filled with helium gas at 20 °C occupies 4.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at - 196°C, raising the pressure to 5.20 atm. What is the volume of the balloon in the liquid nitrogen? A) 0.25 L B) 3.6 L C) 6.

A chemist makes a solution of Ca (NO3) 2 by dissolving 21.3 g Ca (NO3) 2 in water to make 100.0 mL of solution. What is the concentration of NO3 - ions in the solution? Assume that Ca (NO3) 2 is the only solute in the solution.

Which disorder is characterized by slightly bluish/dark-purple skin discoloration, most easily seen in the nail beds and mucous membranes, due to an increased quantity of methemoglobin, hemoglobin not combined with oxygen in systemic blood.

Is burning wood a physical change

A gas is located inside a closed container. if the gas is allowed to occupy more volume inside the container, what will happen to the pressure? (note: there is no gas added to the container.)

An open-end manometer containing mercury was connected to a vessel holding a gas at a pressure of 767 torr. The atmospheric pressure was 724 torr. What is the difference in the heights of the mercury, expressed in cm?

When does raising the temperature of a gas increase its pressure? A. temperature B. volume C. number of particles D. pressure

Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?