A sample composed only of atoms having the same atomic number is classified as

(1) a compound (3) an element

(2) a solution (4) an isomer

determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1,76x10*3 kj/mol.

An atom that has 13 protons and 15 neutrons is an isotope of the element

A balloon has a volume of 6.2 liters at 23.2 C. The balloon is then heated to a temperature of 144.0 C. What is the volume of the balloon after heating?

In which of the following situations would dipole-dipole forces be significant

What are elements and how do they differ?

Where should you keep your glass of soda if you want it to remain fizzy

Why do the atoms in a piece of copper metal have no net charge? -The charges of the positive and negative copper ions cancel each other out. -The number of electrons surrounding each copper nucleus doesn't change.

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).

What compound will not give oxygen on heating

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?