Which of these elements is a metal?

Hafnium

Radon

Silicon

Sulfur

Selenium

How much heat energy is required to raise the temperature of 0.367 kg of copper from 23.0 C to 60.0 C? The specific heat of copper is 0.0920 cal / (g x C) If 125 cal of heat is applied to a 60.0 g - piece of copper at 23.

Which of these are methods of separating a solid from a liquid? A) Decanting, filtering and evaporating B) Decanting and dissolving C) Decanting, filtering and dissolving

What happens to particles at absolute zero

When a reaction increases heat is that endothermic or exothermic, and is it a chemical or physical reaction?

In order to buffer a strong acid into a weak acid, which has a less dramatic effect on ph, what chemical should be used as the buffer?

Consider two solutions, solution a and solution b. [h+] in solution a is 370 times greater than that in solution b. part a what is the difference in the ph values of the two solutions?

All of the following are possible sources of error in a scientific investigation except for O measuring materials such as mass and volume incorrectly. o recording experimental data incorrectly. o having a constant in your experiment.

Do polyatomic ions have fixed charges?

Which type of organism is used to make bread rise when baking? A. plants B. protists C. yeast D. bacteria

How many particles are in 3.55 moles of Aluminum Sulfate