How many valence electrons do the alkaline-earth elements have?

a. 1

b. 2

c. 7

d. 8

How many moles of nitrate ions are present in exactly 275 ml of a 1.25 m copper (ii) nitrate solution, cu (no3) 2 (aq) ?

An aqueous solution is considered neutral if: a. the hydronium ion concentration is 10-8 M b. the hydroxide ion concentration is greater than the hydronium ion concentration c. the hydroxide ion concentration is 10-6 M d.

What is the function of the cell membrain

Cytotoxic t cells can attack target cells with which chemical weapons?

How many moles of N are in. 235g of N2O

Water exhibits high levels of cohesion due to the polarity of the molecule (positively and negatively charged sides). given this information, which type of bond is responsible for water's cohesion and which atoms interact to form this bond?

scientist have found many marine fossils on the mountain far from any ocean or sea what is the best explanation for these fossils

The change in energy needed to change the state of a substance is

What is the main goal of sustainable agriculture? A. To rely heavily on mechanization, pesticides, and fertilizers B. To produce cheap and abundant food at a high cost C. To feed a growing world without damaging the ecosystem D.

A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?