Which Countries have sent a spacecraft to mars this year?

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Who determined the nature of chemical bonds?

Why dose heating increase the speed at which a solution dissolved in water