11. a water molecule is made of hydrogen and oxygen atoms and has the formula h2o. how
would a mixture of hydrogen and oxygen differ from the compound known as water?
o a. the mixture would need to have more oxygen atoms than hydrogen atoms.
ob. the mixture would not need to have a certain ratio of hydrogen atoms to oxygen atoms.
the mixture would be a chemical combination of the elements instead of a physical
combination
od. the individual properties of hydrogen and oxygen would not be retained in a mixture,

The mixture would not need to have a certain ratio of hydrogen atoms to oxygen atoms is the difference between mixture of hydrogen and oxygen differ from the compound known as water.

Option B

Explanation:

Water molecule contains one oxygen atom and two hydrogen atoms which reacted chemically. This means once they go through the chemical reaction process, they lose their individual properties and obtain new properties of water.  

If oxygen and hydrogen form a mixture, they retain their individual properties, they don't need any ratio or and most importantly there is no chemical reaction taking place. Hydrogen Peroxide isn't a mixture but a compound formed when two hydrogen atoms react with two oxygen atoms. The most important factor distinguishing between compound and mixture is a chemical reaction.

it would be d). more resources must be obtained to attain that combination of goods and services

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals