Counting Atoms
Balancing Equations
Ionic
Covalent
Mixtures
100
How many elements are in CO2
ANSWER: 2 elements
Carbon & Oxygen
but 3 atoms - remember to read the questions carefully!
100
when balancing equations, the only number you can change is the _________________
coefficient
100
a positively charged ion is called ___________
cation
100
electrons are ______________ in Covalent bonds
shared
100
If you want to separate large and small solid particles from each other, which tool might you use to be most efficient?
Sifter
Sieve
Strainer
200
How many atoms are in SO4
1 Sulfur atom
4 Oxygen atoms
5 total
200
we balance equations to make sure we follow the Law of __________________
Law of Conservation of Mass (Matter is also OK)
200
a negatively charged ion is called ________
anion
200
covalent bonds typically form between ___________ & _____________
nonmetals & nonmetals
200
This vocab word is a mixture that looks the same throughout, like milk or orange juice, and has dissolved solids. Using evaporation is one of the ways to separate the matter.
Homogeneous mixture
300
How many atoms are in 2Al(OH)3
2 Aluminum atoms
6 Oxygen atoms
6 Hydrogen atoms
14 atoms total
300
Which of these equations is balanced?
1. H2O -> H2 + O2
2. 1F2 + 1Na -> 1NaF
3. 2Mg + Si -> Mg2Si
Equation 3 is balanced
300
name the two groups from the periodic table that frequently make ionic bonds together
Metals & nonmetals
300
Oxygen will form how many typical covalent bonds to become stable?
2!
It needs two more valence electrons to get to eight, so it will need to share an electron twice from neighboring atom(s)
300
Heterogeneous mixtures with liquids & solid in them (not dissolved) could have the matter separated by using _________________
Filtration
400
How many elements are in PHYSiCs ?
P , H , Y, Si , Cs
5 elements total - Count the Capitals!
400
Balance the following equation:
CaSO4 + NaCl -----> Na2SO4 + CaCl2
coefficient of 2 added to NaCl
Coefficient order is: 1211
400
metals typically do what in order to form an ionic bond?
lose electrons / form cations
400
Draw the dot diagrams for a covalent bond of 2 Fluorine atoms.
400
To separate two liquids with different boiling points you would use __________________
Distillation
500
How many atoms are there in glucose?
C6H12O6 ?
24 atoms!
6 Carbon
12 Hydrogen
6 Oxygen
500
C3H8 + O2 -----> CO2 + H2O
C3H8 + 5O2 -----> 3CO2 + 4H2O
500
Which of the following are ionic compounds? List all that apply.
1. NOF2
2. NaOCl
3. MgSO4
4.
NaOCl
MgSO4
500
True or false:
A Sodium atom will form one covalent bond to become stable.
FALSE! Metals do NOT form COVALENT bonds
500
Plan how to separate the following mixture, but you can use each step/tool only once:
Dirt, water, sugar, rusty iron, marbles
Answers will vary:
Remember that you typically want to evaporate last or near last since removing small solids like sand/dirt/sugar/salt is difficult if they're the last few things together!