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Air has many more different substances than helium, which is a single substance. Outside air contains helium.
A substance called DNA (DeoxyriboNucleic Acid) contains the instructions for life.
DNA is the substance within every living cell that contains the instructions for life.
The chloroplast houses the chlorophyll, a green substance which traps sunlight and uses it to convert simpler substances into complex substances during the process of photosynthesis.
"chemical composition" is talking about the individual chemicals that make up a substance. The chemicals it is composed of. eg, wood is mainly carbon, with some water (which is hydrogen and oxygen) and various minerals.
The cytoplasm is a jelly-like substance that contains many chemicals that the cell needs.
It is the cytoplasm.It is the medium in the cell
Cytoplasm
Its a mixture Because it contains some chemicals hence said to be heterogeneous
There is mainly sugar but coke also contains carbohydrate fats acid and many other chemicals
The gel like substance inside a cell is called cytoplasm.
The herb contains two potentially dangerous alkaloids called harman and harmaline. In large amounts, these chemicals may stimulate the tissue of the uterus.
Air has many more different substances than helium, which is a single substance. Outside air contains helium.
Everything contains chemicals dude
All popcorn contains chemicals. What do you think makes it yellow? All popcorn contains chemicals. What do you think makes it yellow?
If you mean where can one find information about the chemical properties of a substance then, a reasonable first step would be to search wikipedia. Many or most of the articles there contain references to source materials. Please see the link.
A pure substance is one which contains only that substance and nothing else. An impure substance contains other substances in varying amounts.