Midterm Review Flashcards
S I unit for distance
Meters
SI unit for mass
Kilogram
SI unit for time
Second
SI unit for amount of substances
Moles
SI unit for temperature
Kelvins
When multiplying in scientific notation you do what?
Multiply the coefficients and add the exponents. Example: 1.3x102(2x105)=2.6x10*7
What should you do when dividing in scientific notation?
Divide the coefficients and subtract the exponents
What is the rule for adding and subtracting in scientific notation?
Because coefficient’s must be the same
Density is equal to?
Mass divided by volume
Group 1 element family name and properties
Alkali metals. High reactivity and melting points low electronegativity
Group 2 elements and their properties
Alkaline earth metals
They have low ionization energy, low electron affinity, and low electronegativity.
They are highly reactive and often form divalent cations.
They are good conductors of electricity.
Transition metals and their properties
they are good conductors of heat and electricity.
they can be hammered or bent into shape easily.
they have high melting points (but mercury is a liquid at room temperature)
they are usually hard and tough.
they have high densities.
Group 17 elements and their properties
Halogens
They all form acids when combined with hydrogen.
They are all fairly toxic.
They readily combine with metals to form salts.
They have seven valence electrons in their outer shell.
They are highly reactive and electronegative.
Group 18 elements and their properties
Noble gases
Almost Non-reactive.
High ionization energies.
Very low electronegativities.
Low boiling points (all monatomic gases at room temperature)
No color, odor, or flavor under ordinary conditions.
Non-flammable.
