A sample of a compound made entirely from copper and oxygen was found to have a total mass of 0.1431g The mass of the copper In the compound was found to be 0.1271g. Calculate the number of moles of copper in the sample.

The force of gravity pulls liquid avity pulls liquid to the bottom of any container. Why did the author include this idea? (A) to explain why liquids take the shape of any container. (B) to explain how gravity works using liquid as an example.

Which of the following is not an example of a polymer? Select one: a. Polystyrene b. Nylon c. Sucrose d. PVC

Ethanol has a chemical formula C2H5OH and sugar has a chemical formula C6H12O6. The individual components in both the substances are carbon, hydrogen and oxygen. Yet, they are two different compounds. What is the reason for this?

What type of reaction does this equation represent? 2I4O9 (s) → 4I2 (s) + 9O2 (g)

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

Which type of reaction is described by the following equation? Na2O (s) + 2CO2 (g) + H2O (g) produces 2NaHCO3 (s)

According to Hund's Rule, if you were filling the three orbitals at the 2p energy level, you would first put an electron in the 2px orbital, then in the 2py orbital, and then in the 2pz orbital;

It is snowing where Jenna lives. It's been snowing all day, but now the snow has changed to sleet and then to freezing rain. What is happening to cause these changes?

Liquid sample a has a higher vapor pressure than liquid sample b (both in closed containers). what can be said about sample a compared with sample b?

A neutral atom has high electronegativity. Describe what happens to this atom during ionic bond formation?