5 Written Questions
5 Matching Questions
- Joseph John Thomson
- How do you determine how many valence electrons an atom has?
- If the photogate is hooked up and only the A light is on what is measured?
- Group 18
- a Family on right side of table, known as the Noble gases,
these atoms have full valence energy levels and are neutral
(no charge). Rarely react with other elements.
- b Discovered the existence of the electron.
Discovered positive & negative charges existed equally in atom. (Plum
- c You can determine how many valence electrons an atom has by looking
at the column of the periodic table the atom is in, this tells you how
many valence electrons it has (Group 1 = 1 valence electron, etc.)
- d The timer records how long in seconds an object blocks and then unblocks the A beam on the A photogate.
- e Matter changes from a liquid to a solid at low temperatures
(water turns to ice by losing thermal energy). Molecules slow down.
5 Multiple Choice Questions
- Matter changes from a liquid to a solid state (candle wax
that has dripped away from candle solidifies)
- the ratio of mass to volume, measures the "compactness" of
- Elements on the border of metals and non-metals and
demonstrate characteristics of both metals and non-metals
- technique to find the volume of an object by submerging
it in water and measuring the volume of water that is
pushed aside is equal to the volume of the object.
- Matter changes from a solid to a liquid. Atoms and molecules
gain thermal energy and move out of position.
(Crayons melt on hot windowsill)
5 True/False Questions
Group 3-12 → Shorter families in the middle of table, known as
transition metals whose valence electrons vary.
element → Volume: V = l x w x h V = (5.5 cm)(1.1 cm)(2.35 cm) = 14.52 cm3
Electron → negatively charged particles found in energy levels around
Why do atoms form chemical bonds? → To become chemically stable and
neutral, which means to have a full valence electron shell.
Nucleus → dense center of atom made up of protons and neutrons,
makes up most of atoms mass