Physical vs Chemical Change
Is this a physical or chemical change?
Scrunching a piece of paper?
Physical
Define element
An element is a pure substance made up of only one type of atom.
It cannot be broken down into anything simpler by chemical means.
What is the chemical symbol for copper?
Cu
How many groups and periods are there?
18 groups
7 periods
What are the reactants?
Reactants are the substances you start with in a chemical reaction.
They are the chemicals that react together to make something new.
Petrol evaporating from the pump?
Physical
Define compound
A compound is a substance made when two or more different elements are chemically joined together.
What is the chemical symbol for Lithium?
Li
What is the atomic number of Carbon?
6
What are the products?
Products are the new substances made in a chemical reaction.
They are what you end up with after the reactants have reacted.
Is this a physical or chemical change?
Dissolving egg shells in acetic acid
Chemical
Define mixture
A mixture is made when two or more substances are combined, but not chemically joined.
What period is Carbon is?
2
How many electrons does Chlorine have?
17
What symbol do we use to show a chemical reaction has happened?
An arrow -->
Is this a physical or chemical change?
A cake cooking
Chemical
Is this an element, compound or mixture?
H2O
Compound
What group is Neon in?
Group 18
What is the mass number for Iron
55.8
How many of each element is there in
H2O
Hydrogen - 2
Oxygen - 1
Is this a physical or chemical change?
Lighting a match
Chemical change
Is this an element, compound or mixture?
HCl
Compound
Find the element in Group 9 Period 4
Cobalt
How many neutrons does Potassium have?
39 - 19 = 20
How many of each element is there in
H2SO4
Hydrogen - 2
Sulfur - 1
Oxygen - 4