What is the percentage composition of chlorine in Nacl

You find a rock that contains equal amounts of potassium-40 and argon-40. how old is it?

When magnesium carbonate, MgCO2, reacts with nitric acid, HNO3, it forms magnesium nitrate, Mg (NO3) 2, and carbonic acid, H2CO3. Carbonic acid then breaks down into water and carbon dioxide.

Define the following term atom

It takes 52.0 j to raise the temperature of an 11.7 g piece of unknown metal from 13.0∘c to 25.0 ∘c. what is the specific heat for the metal?

Physical Meaning of pKa Which of the following aqueous solutions has the lowest pH: 0.1 M HCl; 0.1 M acetic acid (pKa = 4.86); 0.1 M formic acid (pKa = 3.75) ?

What volume of a 0.4M solution can be prepared with 4.6 moles of sucrose? * How?

What experiments did Lavoisier do?

if an atom has 4 protons, 5 neutrons, and 4 electrons, what is the mass number of this atom? How do you know?

What volume of hydrogen gas can be produced by reacting 4.20 g of sodium in excess water at 50.0 Celsius and 106 kPa? The reaction is 2Na + 2H20 - - > 2NaOH + H2.

Is athletes foot abiotic or biotic?