Chemical vs Physical changes
Can chemical changes be reversed?
No they cannot be reversed.
What to subatomic particles are in the nucleus of an atom?
A proton and a neutron.
What are rows called on the periodic table?
Periods
Is a cation positive or negative?
positive
Why do atoms bond?
Is burning wood a chemical change or a physical change?
A chemical change (it can't be reversed)
What charge does the electron have in the atom?
What are columns called in the periodic table?
Families
If an atom gains an electron does it become positive or negative?
negative
When does covalent bonding occur?
Covalent bonding occurs when both atoms share pairs of electrons instead of giving and receiving.
When aluminum is exposed to air it forms a light grey coating Is this a chemical change or physical?
A chemical change.
What is a valence electron?
An electron that orbits on the outer shell of an atom.
How do you figure out the atomic mass of an element?
you add the number of protons and the number of neutrons.
Is an anion positive or negative?
negative
What families do covalent bonds occur between?
Covalent bonds occurs between atoms of non metals and metals.
What are the three properties of a physical change?
change in physical shape, size, and colour
Is a anion positive or negative?
negative.
What formula do you use to remember Diatomic elements?
HOFbrINCL
What is an ion?
An ion is an atom that has lost/gained an electron.
Do similar atoms attract or repel?
Similar atoms repel
Emission of light, colour change, temperature change, bubbles form, see a new substance.
If an atom loses an electron what charge does it become?
Positive
Who created the periodic table?
What charge are atoms usually?
they are usually electrically neutral.
How many electrons are allowed in the outer shell?
only 8 electrons