Elements, Compounds, and Mixtures. Flashcards
What is an element? (2)
An element is a substance that cannot be chemically broken down. Each element is made up of one type of atom.
Why are elements all different from each other?
No two elements are the same; each element is made up of one type of atom.
What lists all elements while grouping together those with similar properties?
The Periodic Table.
What are some examples of elements?
Helium, Hydrogen, Oxygen.
What is a compound?
A compound is a pure substance made of more that one type of element chemically bonded together.
Examples of Compounds are ….., ….., and ….. .
Water, Carbon Dioxide.
What do the chemical symbols C, O, S, and Na stand for?
Carbon, Oxygen, Sulphur, Sodium
A molecule is either:
1) The same type of atom bonded together, for example, O2.
2) Two different elements bonded together. Ex: H2O.
What’s the difference between compounds and molecules?
Molecules can be made up of the same type of atom chemically bonded together, but compounds are pure substances where more than one type of element is chemically bonded together.
How are chemical symbols used for a molecule?
We use the chemical symbols of the atom is contains to write down its formula.
Ex: Carbon Monoxide (fun way to remember: mono=one, so one oxygen particle!): CO
—> One carbon atom
—-> One Oxygen atom.
Copper Sulphate is…
CuSO4—>1 atom of copper; 1 atom of sulphur and 4 atoms of oxygen.
Why do we use numbers after chemical symbols?
To show that there’s more than one atom of that specific element. For example: Carbon Dioxide=CO2=
—–>one carbon atom;
—–> two oxygen atoms.
Elements are made up of (1), and cannot be (2). They can be (3), (4), or (5).
(1) one type of atom.
(2) broken down.
(3) solids,
(4) liquids,
(5) or gases.
There are two types of molecules. What are they?
1-Two atoms of the same elements are chemically bonded together.
2-Two different types of atoms are bonded together.
Compounds are formed between (1). They can either be: (2); or (3).
(1) Two different types of elements that are chemically bonded.
(2) Two different kinds of non-metal elements, for example H20.
(3) A non-metal and metal elements, example, magnesium oxide, which is MgO.
