When writing electron configuration the 3d block comes after the 4s block.

Use the bond energies provided to estimate ΔH°ᵣₓₙ for the reaction below. 2 Br2 (l) + C2H2 (g) → C2H2Br4 (l) Br-Br = 193 kJ/mol; C≡C = 837 kJ/mol; C-C = 347 kJ/mol; C-Br = 276 kJ/mol;

How many protons does neon 12 have

Diffusion of gases can be explained by

Science is based on? A. Facts B. Observations C. Both facts and observations D. Neither facts nor observations

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below?

Modern scientists use a version of the metric system called

Which element has a larger ionic radius than calcium? a. sodium b. gallium c. magnesium d. potassium

Which solution contains the largest number of moles of chloride ions? a. 30.00 ml of 0.100m cacl2 b. 10.0 ml of 0.500m bacl2 c. 25.00 ml of 0.400m kcl d. 4.00 ml of 1.000m nacl e. 7.50 ml of 0.500m fecl3?

What is the chemical formula of titanium (II)

Not related to any subject but how do you tell someone you like them?