At which temperature would atoms of a He (g) sample have the greatest average kinetic energy?

(1) 25°C (3) 273 K

(2) 37°C (4) 298 K

Which of the following is not a chemical property of a substance? - turns green when dissolved in water - produces white flame when exposed to oxygen - gives off brown fumes when treated with nitric acid - conducts electricity - reacts with chlorine

Doing an experiment about electroplating, you attempt to coat silver in gold using a basic electroplating set-up. You take the mass of the silver before and after the experiment.

Is table salt a compound

C4H6O3 + H20 " С2 Н402

Models do not change after they are originally created.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K

In the reaction, HCl + H2O produces H3O + Cl, what is the conjugate acid