A 3.2-gram sample of air contains 0.000 74 gram of hydrogen cyanide. Determine the concentration, in parts per million, of the hydrogen cyanide in this sample.

Why will paper stick to a ballon that you have rubbed on your hair?

Who discovered nucleus and proton

The movement of water across a membrane is termed

A gas in a rigid container is heated so that it's kelvin temperature doubles. What happens to its pressure

A graduated cylinder is filled with water to a level of 40.0 mL. when a piece of copper is lowered in to a cylinder, the water level rises to 63.4 mL. find the volume of the copper sample. if density of the copper is 8.9 g/cm^3, what is its mass?

A student prepares 150.0 mL of 1.40 M HCl using 35.0 mL of a stock solution. What is the concentration of the stock solution?

True or false? All atoms of the same element have the same atomic mass

Write a balanced equation for the reaction of copper with silver nitrate. According to the balanced equation, what is the mole ratio of silver produced to copper reacted? _ mol Ag produced : _mol Cu created

Describe what happens to the potential energy if you increase the mass of the object. IL

The mass of the ocean is about 1.8 X 10^21 kg. If the ocean contains 1.076% sodium ion, Na+, what is the mass in kilograms of sodium in the ocean?