What does the law of conservation of matter state? (Select all that apply.) A. Matter cannot be created.

B. Matter cannot be changed.

C. Matter can be destroyed.

D. Matter can be changed.

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

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?

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?