Which of the following elements are not main-group elements?

Check all that apply.

Pb

Mo

Cs

Br

Al

How much heat energy (in megajoules) is to convert 7 kilograms of ice at - 9 degrees celcius to water at 0 degrees c

The water in a 2500-L aquarium contains 1.25 g of copper. Calculate the concentration of copper in the water in ppm (remember 1 L H2O=1 kg).

What is the percent by mass of solute if 14.60g 74.95g of water?

Using the bond energies provided below, calculate δh° for the reaction ch4 (g) + 4cl2 (g) → ccl4 (g) + 4hcl (g) bond energies: c-h = 413 kj/mol, cl-cl = 243 kj/mol, c-cl = 339 kj/mol, h-cl = 427 kj/mol a. 1422 kj b. 110 kj c. 440 kj d. - 440 kj e.

What kind of science is most used to build or design useful technology?

Two identical atoms from Area B bond together. What type of bond will they most likely form A. Electrostatic B. Metallic C. Ionic D. Covalent

Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution? 1.75% K2CrO4 [K2CrO4] (K2CrO4) K2CrO4, [M] = 1.75

Consider the reaction C12H22O11 (s) + 12O2 (g) →12CO2 (g) + 11H2O (l) in which 10.0 g of sucrose, C12H22O11, was burned in a bomb calorimeter with a heat capacity of 7.50 kJ/∘C. The temperature increase inside the calorimeter was found to be 22.0 ∘C.

List three pros and three cons of nuclear energy.

What is the formula or equation for motion, speed and energy?