write down the properties of elements and compound
Answers
Answer:
Elements are substances that cannot be separated into simpler substances. Salt
is made up of the elements sodium and chloride. Water is made up of the
elements hydrogen and oxygen
The smallest particles of matter are called atoms Remember the carrot from
the other chapter. If you continue to chop a carrot into smaller and smaller
pieres, eventually you would reach a point where you could not cut up the
carrot anymore, but still have carrot. You would then have molecules of carrot
The same applies to clements If you continually cut up a piece of aluminum
you will reach a point that you could no longer divide it These are aluminum
atoms. An atom is the smallest particle of an element that has the properties of
that element. Some properties of aluminum are: shiny, silver colored, fragile.
and thin. Each element has its own type of properties
Chemists Use symbols to represent elements A symbol is a letter or picture
used to represent something chemists use one or two letters to represent
elements. The symbol for aluminum is Al The symbol for oxygen is
A model of an oxygen molecule
The symbol for oxygen is. O stands for one atom of oxygen. Oxygen atoms
are joined in pairs To write a pair of oxygen atoms using symbols, we use the
symbol O and the number 2 Oxygen would be (021 The 2 is a subscript Sub
means below. The 2 is written to the right of and below the O, A pair of
oxygen atoms is a molecule of oxygen. Molecule is the smallest particle of a
substance that exists independently Molecules of most elements are made up
of only one of atom of that element Oxygen, along with nitrogen, hydrogen
and chlorine are made up of two atoms. Look at the model of oxygen above
The two balls represents the two oxygen molecules The oxygen molecules are
bonded or stuck together. We will learn about bonds later
Compounds
A compound is a substance formed when two or more elements are chemically
jones Water, salt, and sugar are examples of compounds When the elements
are joined the atoms lose their individual properties and have different
properties from the elements they are composed of. A chemical formula is
used a quick way to show the composition of compounds Letters, numbers
and symbols are used to represent elements and the number of elements in
each compound
Mixtures
Mixtures are two or more substances that are mixed together but not
chemically joined. A good example of a mixture is a salad. There are tomatoes,
Lettuce, cucumber, and salad dressing all mixed together No chemical
reactions occur between the vegetables and the dressing You can separate
each of the vegetables from each other.
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