CH 1-2
Boiling water is an example of a chemical or physical change.
Let's get physical!
How many sig figs is 3,100
2
Platinum (II) chloride
How many molecules are in 51,000 moles?
3.1 x 1028 molecules
What sport did I play in college?
Lacrosse
Compound, mixture, or pure substance?
N2 and O2
Mixture
Round 22.998 to 4 sig figs
23.00
Write the isotopic symbol notation for Oxygen-18?
188O
What is the percent composition of Mg(OH)2?
% Mg = 41.68
% O = 54.86
% H = 3.456
How many years have I worked at NDP?
2!
Distilled water is
Pure water!!!
How do you measure something?
Write down the numbers that are certain, then add 1 more digit that is uncertain.
Which scientist discovered the electron?
The one and only J.J. Thomson
The empirical formula of a compound is CH2. Its molecular mass is 70.00 g/mole. What is the molecular formula?
C5H10
Am I left or right handed?
Left!
What are the 4 steps of the scientific method?
1. Make observations, 2. formulate a hypothesis, 3. perform experiments and make observations, 4. draw conclusions.
Compare accuracy and precision.
Accurate is how close a single measurement is to the actual value.
Precision is how close several measurements are to each other.
What is the formula of aluminum sulfate?
Al2(SO4)3
How many atoms are in 41 g of Mg?
1.0 x 1024 atoms
What college did I go to?
University of Vermont
The 4 indicators of a chemical change
1. release of a gas
2. production of light/heat
3. unexpected color change
4. formation of a precipitate (solid)
What is the density of Ms. Cumpston's favorite Chobani creamer if it weighs 200 g with a volume of 710 mL.
0.3 g/mL
What are the differences between type I, type II, and type III and how do you name them?
Type I contains a metal with 1 charge.
- Full name of metal with anion -ide name
Type II contains a metal with more than 1 charge.
- Full name of metal (roman numeral charge) with anion -ide name
Type III contains only nonmetals.
- Prefixes are used to indicate how many are in the formula
CHEM 3: Write, then balance the equation.
Phosphoric acid reacts with aqueous sodium hydroxide in a neutralization process to form aqueous sodium phosphate and water.
CHEM 4: Predict the products for the reaction. Then balance!
Li3PO4 (aq) + BaCl2 (aq) -->
CHEM 3:
H3PO4 (aq) + 3 NaOH (aq) --> Na3PO4 (aq) + 3 H2O (l)
CHEM 4:
2 Li3PO4 (aq) + 3 BaCl2 (aq) --> 6 LiCl (aq) + Ba3(PO4)2 (s)
Does Ms. Cumpston like peas?
No! She leaves them leftover!