How many moles are in 2.58 x 10^24 atoms of calcium?

50.0 grams of KCl is dissolved in water to make a 4.00 L solution. What is the molarity of the solution? (Molar mass of KCI = 74.5 g/mol) _ M (Round your answer to the appropriate number of four significant figures) Enter the answer Check It

How much heat is needed warm 65.34 g of water from 18.43 to 21.75

An assay protocol requires you to add 12.5 mg of lysozyme to 1.0 L of buffer. You have a lysozyme stock vial labeled 25 mg/mL. How many microliters (UL) of the stock will you need to add to your solution.

Elements in the halogen group are a. very reactive b. have seven electrons in the outer shell c. react to form salts d. all of the above

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule, which molecular orbitals are formed?

Which of the following is easist to accelerate? A. bowling ball B. tennis ball C. golf ball D. ping pong ball

Fish need at least 4 ppm dissolved o2 for survival. part a what is this concentration in mol/l?

How does a runoff get polluted.

Anatom that has lewer neutrons than protons and more electrons than protons is

Which can have either a positive charge or a negative charge when they are released during radioactive decay? A. alpha particles B. beta particles C. positrons D. photons