What is enthalpy a measure of?

The heat content of a system.

The kinetic energy of a system.

The number of moles of reactant in a system.

The disorder of a system.

When a sample of aluminum with a mass of 23.625g is placed in a graduated cylinder with 22.69 ml of water the volume is raised to 31.44ml what is the density of the metal

Periodic Table:Question 6 Which characteristic of an element determines its placement in the periodic table? Select one

Is NaCi a metal or nonmetal

Which of the following was not a contribution by Niels Bohr? Electrons are in orbits. There is a relationship between the outer shell and chemical properties. The charge of an electron. Quantum energy emissions.

In an experiment, onion plants of different ages were exposed to various amounts of caffeine to determine the effect of caffeine on cell growth. Temperature, amount of water, and light were kept constant.

What kinds of scientific investagations involve making observations

According to the kinetic molecular theory, when a gas particle hits something what will happen?

Protons and neutrons are made from which of the following? hadrons down quarks only up quarks and down quarks up quarks only

Not all of the water falls as rain, snow, or sleet evaporates. What happens to the rest of the water?

58.5 million excess electrons are inside a closed surface. What is the net electric flux through the surface?.