Can anyone help me differenciate element from compound?
Items: Air, graphite, water, petrol, ethanol, nylon, steel, protein, chromium
Which is a/an:
1) Element
2) compound with only 2 elements
3) compound that contains nitrogen
4) mixture of compounds
5) mixture of elements
Answer:
If a substance is comprised of more than one element (that is, it has a place on the periodic table) then it's a compound. If the substance is made entirely of ONE element in the periodic table, it's not a compound.
-air is a compound comprised mainly of oxygen (element) and nitrogen (element)
-graphite is an element because it's comprised entirely of carbon ... it's crystal structure makes it unique.
-water is a compound because it's comprised of oxygen and hydrogen (H2O)
-petrol (gasoline?), ethanol, nylon, steel, protein are all compounds ... they're all comprised of many elements
-chromium is an element
elment is a pure substance with no impuraties, like oxygen or silver
compounds are a mixture of 2 or elements which have been chemically bonded to for a new material with its own properties
silver nitrate? copper nitrate?
element - only one type of atom. eg iron, alumunium
compound - with more than one atom in the milecule. eg - water(H2O)
compound with nitrogen - NO2(nitrogen dioxide
mixture of compounds - eg milk
mixture of elements - steel, brass
Air is a mixture, mainly of elements nitrogen, oxygen, and argon, although it does contain small amounts of compounds such as carbon dioxide and water vapor (not counting pollutants). Graphite is an element, a form of carbon. Water is a compound of hydrogen and oxygen, H2O. Petrol or gasoline is a mixture of compounds. Ethanol is a compound with the formula C2H5OH. Nylon is a compound. Steel is an alloy, a specific mixture of the elements iron and carbon. A protein is a compound that contains nitrogen. Chromium is an element.
You have seen a periodic chart. If it is on that list, it is an element. Chromium is on that list.
Water is an example of a compound having only two elements. Hydrogen and oxygen. Ethanol has three: Carbon, hydrogen and oxygen.
Protein has nitrogen.
petrol is a mixture of compounds.
Air and steel come closest to being a mixture of elements. But it is not quite true of either one because they contain other things also.
if I understand the way you've asked the question, you sought to identify the specific examples that you gave of Air, graphite, water, petrol, ethanol, nylon, steel, protein, chromium
Which is a/an:
1) Element
graphite is pure carbon that has taken on structural differences but the actual chemical property remains C Thus, even though graphite is named on the Table of Elements, it is still made entirely of Carbon and thus qualifies as an Element and not a compound
Chromium is an element.
2) compound with only 2 elements
distilled water has only two elements, hydrogen and oxygen
3) compound that contains nitrogen
air contains nitrogen
4) mixture of compounds
nylon is a mixture of compounds, the same is true for proteins
5) mixture of elements
steel is a mixture of chromium, nickel and molybdenum, petrol
is made up of oxygen, carbon, hydrogen as is ethanol
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Which is a/an:
1) Element
2) compound with only 2 elements
3) compound that contains nitrogen
4) mixture of compounds
5) mixture of elements
Answer:
If a substance is comprised of more than one element (that is, it has a place on the periodic table) then it's a compound. If the substance is made entirely of ONE element in the periodic table, it's not a compound.
-air is a compound comprised mainly of oxygen (element) and nitrogen (element)
-graphite is an element because it's comprised entirely of carbon ... it's crystal structure makes it unique.
-water is a compound because it's comprised of oxygen and hydrogen (H2O)
-petrol (gasoline?), ethanol, nylon, steel, protein are all compounds ... they're all comprised of many elements
-chromium is an element
elment is a pure substance with no impuraties, like oxygen or silver
compounds are a mixture of 2 or elements which have been chemically bonded to for a new material with its own properties
silver nitrate? copper nitrate?
element - only one type of atom. eg iron, alumunium
compound - with more than one atom in the milecule. eg - water(H2O)
compound with nitrogen - NO2(nitrogen dioxide
mixture of compounds - eg milk
mixture of elements - steel, brass
Air is a mixture, mainly of elements nitrogen, oxygen, and argon, although it does contain small amounts of compounds such as carbon dioxide and water vapor (not counting pollutants). Graphite is an element, a form of carbon. Water is a compound of hydrogen and oxygen, H2O. Petrol or gasoline is a mixture of compounds. Ethanol is a compound with the formula C2H5OH. Nylon is a compound. Steel is an alloy, a specific mixture of the elements iron and carbon. A protein is a compound that contains nitrogen. Chromium is an element.
You have seen a periodic chart. If it is on that list, it is an element. Chromium is on that list.
Water is an example of a compound having only two elements. Hydrogen and oxygen. Ethanol has three: Carbon, hydrogen and oxygen.
Protein has nitrogen.
petrol is a mixture of compounds.
Air and steel come closest to being a mixture of elements. But it is not quite true of either one because they contain other things also.
if I understand the way you've asked the question, you sought to identify the specific examples that you gave of Air, graphite, water, petrol, ethanol, nylon, steel, protein, chromium
Which is a/an:
1) Element
graphite is pure carbon that has taken on structural differences but the actual chemical property remains C Thus, even though graphite is named on the Table of Elements, it is still made entirely of Carbon and thus qualifies as an Element and not a compound
Chromium is an element.
2) compound with only 2 elements
distilled water has only two elements, hydrogen and oxygen
3) compound that contains nitrogen
air contains nitrogen
4) mixture of compounds
nylon is a mixture of compounds, the same is true for proteins
5) mixture of elements
steel is a mixture of chromium, nickel and molybdenum, petrol
is made up of oxygen, carbon, hydrogen as is ethanol
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