Which electron configuration represents the electrons of an atom in an excited state? (1) 2-4 (3) 2-7-2

(2) 2-6 (4) 2-8-2

Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell?

Liam knows that some of the bubbles in his experiment must be oxygen. He draws an atomic model of the element oxygen. What does he include in his drawing? Select all that apply.

Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.054 moles of sulfuric acid is mixed with water to make 667 milliliter of solution, what is the molarity of H+? Answer in units of M doing mole/liter doesn't work

20 Liters of a mixture of N2 gas and CH4 gas was made up with a pressure of 700. Mm Hg and a temperature of 300. C. If the partial pressure of N2 gas was 250. Mm Hg, how many grams of CH4 were added to the mixture?

What mass of potassium hydroxide is required to react completely with 2.70 g of sulfuric acid to produce potassium sulfate and water?

What is a covalent bond?

Which statement describes how the binary ionic compound CaCl2 is named? The nonmetal is named first, and the ending is replaced with - ide. The metal is named first, and the ending is replaced with - ide.

Calculate the empirical for the molecular formula mass and the molar mass of each of the following minerals: (a) Limestone, CaCO3 (b) halite, NaCl (c) beryl, Be3Al2Si6O18 (d) malachite, Cu2 (OH) 2CO3 (e) turquoise, CuAl6 (PO4) 4 (OH) 8 (H2O) 4

How is a suspension different from a colloid?

What is the atomic number of 232Th