67g of K2O is how many moles

Which of the following terms is defined by the measure of mass per unit of volume? gravity density weight acceleration

What is the reason for all these geological changes with the earth?

Uranium-235 and plutonium-239 are used in nuclear reactors because of their 1. ability to undergo fission 2. ability to undergo fusion 3. inability to absorb neutrons 4. inability to release neutrons

3% Hydrogen Peroxide has an oral LD50 of 900 mg/kg. Acetic Acid has an oral LD50 of 3310 mg/kg. Which one is more hazardous to consume

What volume of methanol should be used to make 1.25 L of a 21.0% by volume solution? ___ mL

Whats the mass number of the atom 86/36 Kr?

An apple is placed on a scale. the scale shows that the apple weighs 1/4 a pound. this demonstrates that the apple has A: Atoms. B: Elements. C: Vitamins. D: Weight.

Identify Cobalt sulfride

If the reactants have a potential energy of 10.2 kJ/mol and the products have a potential energy of 15.7 kJ/mol, what is AH?

How to solve determine the final temperature when 450.2 grams of aluminum at 95.2°c is placed in an insulated calorimeter with 60.0 grams of water at 10.0°c?