900 gram of water at 80 degree Celsius is mixed with 2 kg of water at 20 degree celcius . Calculate the temperature of mixture.​

What is the overall order of reaction for rate = k[no]2[o2]

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons