A calorimeter contains 251 g of water at 24.3 C. The temperature of the water decreases to 18.5 C when 12.5 g of potassium nitrate is dissolved in water. Is dissolving potassium nitrate in water endothermic or exothermic

Which of the following is true for a cell that has DNA present inside a nucleus? A: It must be a part of the oldest known fossils B: It must be a part of a eukaryote C: It must be a part of a bacterium D: It has a nucleoid

If I have a chemical with a 9 on the pH scale, is it safe to handle with the same gloves as I've handled fire with?

Why are lead compounds harmful to us?

Why does electronegativity decrease down a family? A: The sizes of the atoms increase. B: The sizes of the atoms decrease. C: The total positive charge increases. D: The total positive charge decreases.

1. Why is carbon dioxide a gas at low temperatures at mars 2. How does sodium chloride combine (share) electrons 3. Name the force of attraction between metal and non-metal 4. Explain ionic compound

Is it always possible to identify something as an element compound pure substance or mixture

Why would someone weigh less on Pluto?

HNO3 + H2O > H3O (aq) + NO3 - (aq)

What do you get when you mix lemons with gunpowder

What is the mass of 9.92*10^24 molecules of methanol?