Posted in Chemistry

Phenoxyethanol, glycol ether often derived from natural sources, is a popular antibacterial and preservative chemical, used by many so called natural and organic skin care brands


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Posted in Chemistry

Explain why elements and compounds are pure substances

Elements
and compounds are substances because we know exactly what is in them.
Elements are only one kind of atom and have a symbol. Compounds have a
formula telling us exactly how many of what kind of atom make up that
compound




Solutions, homogeneous mixtures, not only contain 2 compounds, but we do
not know how much of each. We can make salt water with one grain of
salt in a cup of water or a drop of water in a cup of salt. Mixtures do
not have a formula because they can be any concentration.

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Posted in Chemistry

What does the term “compound” mean?

A compound is a substance formed when two or more chemical elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent bonds and ionic bonds. The elements in any compound are always present in fixed ratios.

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Posted in Chemistry

What is the difference between a compound and mixture

Here is what i got from my notes, hope this helps.

Mixture components keep their identities.
Mixture components CAN be separated PHYSICALLY
Homogenous Mixture: You CAN NOT the different parts (phases) of the mixture
Heterogeneous Mixture : You CAN SEE the different parts (phases) of the mixture easily
A solution is a HOMOGENOUS MIXTURE of particles so small that they cannot be seen and CANNOT be filtered out
A compound is something that is made from something that can be separated from 2 things.
It is a mixture and has chemical bonds.

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