Why is a mixture a physical change

How are atoms and elements alike and different?

What mass of sulfur has to burn to produce 4.5L SO2 at 300°C and 101 kPa in the following reaction? A. 13.5 g S B. 3.07 g S C. 68.8 g S D. 41.0 g S

In an atomic model that includes a nucleus, negative charge is

Mention the raw material use in respiration and products formed during respiration.

David's body breaks down the sandwich into small enough molecules that can be absorbed through his intestinal lining and then into his. His body breaks down the carbohydrates in the bread into, the proteins into, and the fats.

The volume, in liters, of 538 g of CO2

9.86 x 10²⁸ O-atoms require what volume (L) N₂O₂ at STP?

What is a group of elements that form salts called

Which number represents an acidic pH, 4 or 9?

What would make the risk of these cancers even worse for someone who drinks alcohol?