1H Elements, Compounds & Mixtures
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What is the smallest unit of matter?
The Atom
What do we call a substance that is made up of only 1 type of atom?
An element
How would you describe a compound?
A molecule that has 2 or more different elements chemically joined together
What is a molecule?
A group of atoms chemically joined (bonded) together
What is a mixture?
Two or more chemical substances which are NOT chemically joined, found together
What is the chemical symbol for Helium?
He (big H and small e), NOT hE, HE or he
What is H2O made up of?
Hydrogen (x2) and Oxygen (x1)
What is the molecule CO2 made up of
Carbon (x1) and Oxygen (x2)
What is a ‘pure’ substance
A substance made of only 1 type of molecule (element or compound) and has a fixed melting point.
What is a ‘group’ in the periodic table?
A column with elements that have similar properties.
Which word describes a metal that can be stretched into thin wires?
Ductile
Which word describes a material that can be hammered and rolled into thin sheets?
Malleable
What is meant by the ‘properties’ of a substance?
The characteristics it has (this can be physical or chemical properties)
What are ‘Physical properties’ of a substance? - Give an example.
A property that can be seen e.g. colour, state of matter, melting point.
What are ‘Chemical properties’ of a substance? - Give an example.
How a substance interacts with other substances. E.g. how easily it burns (flammability), rusts or reacts with an acid.
Which word describes a material that makes a ringing sound when it is hit with a hard object?
Sonorous
What do the letters in a chemical formula represent?
The elements that make up this molecule E.g. NaCl is salt made of Na and Cl bonded together.
What do the large numbers in a chemical formula represent?
How many molecules there are e.g. 2CO = (2 molecules of CO)
What do the small numbers in a chemical formula represent?
how many atoms of each element are present in one molecule.
Why are formula useful in Chemistry?
Formula show us which elements are found in a molecule and how many of each atom is in them.