Unit Test 2 Flashcards
(25 cards)
pure substance – what is it? Give some examples
It’s an element like iorn
element – what is it? Give some examples
A chemical substance like gold
compound – what is it? How is it different from an element?
A mix of 2 or more elements
what are valence electrons?
The electrons on the last shell
cation/anion – what are they?
Cation is a positive charged ion and Anion is a negative chraged ion
states of matter – name them/ particles distribution/ (mass/shape/volume)?
Solid: Particles are close together has mass shape and volume
Liquid: Particles are further apart has mass and has no shape
Gas: Particles are far away has no mass or volume
atom structure –all 5 parts and their location
Nucleus, orbit, proton, electron, neutron
heterogeneous mixture – definition and examples
A mechanical mixture where the two thing are visibly separate
what is a isotope
It’s an atom with a different amount of neutron from protons
what is a ion
an electric charge that an atom takes on when it loses or gains electrons
what is atomic models –> scientists (names) + what each scientist discovered (their contribution to our understanding of the atom)
Bohr
who created the periodic table?
Demetri Mandlev
what is ionic and molecular compounds – what is the difference?
ionic = Non-metal + metal
Molecular = Non-metal + Non-metal
- how many elements are known today?
118
- the structure of each “BOX” from periodic table – what the symbols/ numbers mean?
Atomic number: Number of protons an atom has
Atomic mass: Mass of an atom of a chemical element
Element name: Name of the element of the periodic table
Element symbol: one or two letter to represent an element of the periodic table
- columns – what are they? Name the ones we discussed in class and KNOW where they are located
18 vertical rows, on the left Alkali metals, Alkaline earth metals, on the right halogens, noble gases
- periods - what are they? Why are they important – what information can we get?
7 horizontal rows Depending on what period is the more shell it has
- what are noble gasses + characteristics +location
the 18 group on the right non-metallic and very unreactive
- what are halogens +characteristics+ location
the 17 group on the right non-metallic elements that are strongly reactive
- what are alkali metals+ characteristics+ location
The 1 group on the left metallic elements that are strongly reactive
- what are alkaline earth metals + characteristics+ location
The 2 group on the left metallic elements that are reactive
know all 3 formulas
M/V=D
M/D=V
D/V=M
Name 3 properties of metals/non-metals?
state of matter, colour and luster
What are metalloids?
They’re a mix of metals and non-metal
