How many moles of na are needed to produce 4 moles of nacl in this reaction? 2na + cl2 → 2nacl?

A 40.27 g sample of a substance is initially at 24.8 °c. after absorbing 2099 j of heat, the temperature of the substance is 148.5 °c. what is the specific heat (c) of the substance?

What is the volume of 4.2 moles of Ca (NO3) 2 at STP

Mercury is often released into water bodies with industrial effluents, where it is then converted to the compound form methylmercury. Methylmercury is easily absorbed by aquatic organisms.

What rock is formed under the greatest conditions of heat and pressure?

What is the final concentration, in mg/mL, for a solution prepared by adding 12.00 mL of a 3.590 mg/mL Cu2 + stock solution into 100.00 mL volumetric flask and filled with water to the calibration mark?

What's a certain indicator that a molecule is polar?

If an electron fell to a lower orbit or energy level, energy would be a. created. b. emitted. c. absorbed. d. transferred.

How many electrons are contained in an Au3 + ion? (1) 76 (3) 82 (2) 79 (4) 197

Match the element with its number of valence electrons. Column A 1. Boron : Boron 2. Carbon : Carbon 3. Fluorine : Fluorine 4. Sodium : Sodium Column B a. 4 b. 1 c. 3 d. 7

The number of energy levels to which an electron can jump depends on the