Physical and chemical change
The atom and elements
The periodic table
Element, mixture, compound
Naming molecules and compounds
100
Is melting ice a physical or a chemical change?
physical
100
out of the following, which of the subatomic particles have a positive charge?
Protons, neutrons or electrons?
Protons
100
Identify the atomic number of lithium
3
100
Is this diagram displaying elements, compounds, or mixtures?
Element
100
How many different elements are present within the following:
H2Na4
2
200
Is food breaking down a physical or a chemical change?
Chemical
200
Identify what part of the atom A is pointing to
Electrons
200
Identify the atomic mass of the following element
22.990
200
Is this diagram showing elements, compounds, or mixtures?
Mixture
200
State the number of atoms present within the following:
Li4Cl2O3
Li-4
Cl-2
O-3
300
Butter melting on a hot pan. Is it a physical or chemical change?
Physical
300
Identify the part that B is pointing to
Neutrons
300
Identify the number of protons in the element below
7
300
Is this diagram showing elements, compounds, or mixtures?
Compound
300
Name the following compound:
Lithium + oxygen -->
Lithium Oxide
400
Cooking an egg on a fry pan, is this a physical or a chemical change? Justify your answer
Chemical, because it is not reversible and the colour changes
400
Another name for a homogeneous mixture.
Solution
400
Identify the number of electrons from the following element
17
400
Identify if the following is a element, mixture or compound
H4C2O
Compound
400
Name the following compound:
Sodium + Nitrogen + Oxygen -->
Sodium nitrate
500
wood is burned in a fire to create ash.
Identify whether it is a physical or chemical change, justify your answer
Chemical as a new substance has been created and it cannot be reversed
500
Another name for a heterogeneous mixture that separates into layers over time
Suspension
500
Explain how the period table has changed over time (how did it used to be organized vs how it is organized today)
The periodic table used to be organised by the mass of the element, by demitri mendelev.
The periodic table is now organised based on the atomic number
500
Explain the difference between an element and compound
An element is only one type of element, while compounds are 2 or more elements which have been chemically combined
500
Name the compound:
Al₂O₃
Aluminum oxide