What is the definition of polar in Chemistry?

What will be the frequency of this x-ray

7. A nonpolar covalent bond (i. e., pure covalent) would form in which one of the following pairs of atoms? A) Na Cl B) H Cl C) Li Br D) Se Br E) Br Br

How can a molecule have a momentray dipole

Potassium dichromate (K2Cr2O7) is used in tanning leather, decorating porcelain and water proofing fabrics. Calculate number of chromium atoms in 78.82 g of this compound.

Which of the following pairs of elements could possibly be in the same group on the periodic table? A forms a 1 + ion; B forms a 1 - ion. A has an atomic number 15; B forms a 3 - ion. A tends to form a 2 + ion; B tends to gain two electrons.

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.