Elements, compounds, mixtures
Define the two types of mixtures
Homogeneous and heterogeneous
What are isotopes?
Atoms of the same element with different numbers of neutrons because of the different mass #
name 3 elements that is in the same PERIOD as iron (Fe).
potassium, calcium, scandium, titanium, vanadium, chromium, manganese, cobalt, nickle, copper, zinc, gallium, germanium, arsenic, selenium, bromine, or krypton
How many ELEMENTS does Ba(NO2)3
3
What is an ionic and covalent bond?
ionic = metal and nonmetal
covalent = non-metal and non-metal
True or false: H2O and H2O2 are the same compound
false
True or false: Negative ions lose electrons
false
Name a metal, non-metal, and a metalloid.
possible answer: metal - nickel
non-metal - helium
metalloid - boron
Find the amount of atoms in each element - (NaOH)
Na - 1
O - 1
H - 1
Do ionic bonds TRANSFER or SHARE electrons?
Transfer
Is the following pure substance an element or compound (NaHCO3)
compound
Is the following element an ion or isotope (sulfur - 33)
isotope
What is the difference between metals and non-metals on the periodic table?
Metal and non-metal reactivity trends are opposite because metals become more stable by losing electrons, while non-metals become more stable by gaining electrons.
How many molecules does 3Br2 have
3
If sodium (Na) and chlorine (Cl) form an ionic bond, which element would LOSE electrons?
Sodium would lose 1 electron
What does the group of an element tell you
valence electrons (most outer electrons)
Would sodium lose or gain electrons to become stable and how many electrons would it lose or gain
lose 1
Why can't noble gases (group 18) with other elements?
Find the amount of atoms in each element - Mg3(PO4)2
Mg = 3
P = 2
O = 8
What type of bond would be made if Nitrogen reacted with Fluorine?
Covalent
Fill in the blank..
Elements found in group 1 are called ____
Elements found in group 2 are called ____
Elements found in group 17 are called ____
Elements found in group 18 are called ___
Alkali metals
Alkali Earth metals
Halogens
Noble gases
Find the following for the element Neon (Ne)
Mass (rounded) ____
# of Protons ____
# of Electrons ____
# of Neutrons ____
mass = 21
protons = 10
electrons = 10
neutrons = 11
Why does the reactivity increase as you go down group 1?
Reactivity increases as you go down the family because the size of the atom increases and the pull from the nucleus on the valence electrons decreases.
compound
DRAW a lewis dot diagram showing the covalent bond with carbon and 4 hydrogens
___