Which of these is an example of a chemical change?

Deflating a rubber balloon

Combining rubber with sulfur

Stretching an elastic rubber band

Erasing pencil marks from a page

What is the formula units for sodium sulfide, sodium sulfite, anf sodium sulfate?

What is the mass in grams of one mole of any substance know as

Name three human activities that are changing the natural world. Why do these activities make it important to understand evolution?

Karl puts a piece of ice in a small plastic bottle without a cap, and finds that the mass of bottle and ice is 18.1 g. Several hours later he finds that the mass of the bottle and water is 17.8 g.

What is atomic radius? Does it decrease going up or down a group?

What is the chemical formula for potassium permanganate?

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