Chem 2 Final Study Guide
The symbol --> in an equation means __________.
It is like the equal sign or what comes after it is the product of the reactants coming together.
Which is the more concentrated solution 4.20 M or 0.4200 M?
It is the 4.20 M
You are making hot chocolate with hot milk and a packet of Freshy Q's Hot Chocolate Drink Mix Powder. What part of the solution is the Drink Mix Powder?
It is the solvent
The reaction TiCl4 + 4Na --> Ti + 4NaCl is a __________ reaction.
Single replacement
Why is important for human beings to have neutral or near neutral pH in their bloodstream?
So that when you put is in the body then it wouldn't ruin the body.
__________________ are substances that resist change in __________. a. acids ; pOH b. bases; pH c. buffers ; pH.
a. acids ; pOH
Which of the following is an acid? a. HCl b. HF c. NaOH d. HBr
A. HCl
For a given solution at 25 °C pH + pOH = _____.
14
What is the Greek prefix for the number 7? 5? 8?
Hepta, Penta, Ota
Stoichiometry Lab: Decomposition of Baking Soda OBSERVATIONS AND DATA 1. Mass of vaporating dish .....................12.00 g. 2. Mass of (evaporating dish + hydrate)....14.00 g. 3. Mass of (evaporating dish + anhydrous salt).13.50 g. Calculate how much water was lost in this experiment. Calculate how much anhydrous salt was left in the evaporating dish.
0.5g 1.5g
Monoprotic Acids (Ex: HCl ) can give how many Hydrogens?
1
Examine the following picture:How many sigma bonds are there in the rubbing alcohol molecule? a. 0 b. 8 c. 9 d. 10
10
Diprotic Acids (Ex: H2SO4 ) can give how many Hydrogens?
2
You are in a titration lab with Billie "Don't be a Hero" Eyelids. You have an acid with a concentration of 3.0 M. You have a base that you need to find the concentration using the 3.0 M acid. You titrate the acid with the base. Here is the data: Base concentration: 3.0 M Base volume: 25 drops Acid concentration: Unknown Acid volume : 35 drops. What is the concentration of the acid?
2.1429
How many grams of H2SO4 would you prepare 2.5 liters of a 5.5 M of H2SO4 solution?
215.798
Calculate the grams / mole for N2 MgBr2 Ba(NO3)2 Ca(NO3)2
28.02 gr/mol 184.11 gr/mol 261.35 gr/mol 164.82 gr/mol
Choose the correctly balanced equation. __NH3 + __O2 --> __H2O + __NO2
4NH3+7O --> 6H2O+4NO2
How many grams are in 1 mole of Iron atoms?
55.85 grams
Which of the following pH values represents a solution with the highest concentration of hydronium ions?
7
If an atom has a full s and a full p sublevel in its first energy level. How many electrons does it have?
8
So if a base accepts a hydrogen atom we call that ___________________.a. protonation b. deprotonation
A protonation
A sour taste is associated with __________.
Acid
Aluminum and chlorine react to form __________. (HINT: Formula)
Aluminum Chloride
According to the VSEPR theory two-atom molecules are __________ linear.
Always
__________ Crystal that does not have the water in it.
Anhydrous salt
So what is the pH scale based on? a. Water doing nothing in a beaker. b. Water self-ionizing into H+ and OH - a beaker. c. Water doing water tricks in a beaker. d. Making AP Bio and APES more interesting.
B. Water self-ionizing into H+ and OH - a beaker.
What type of bond forms as a result of orbitals overlapping end to end? a. pi b. sigma c. gamma d. delta
B.Sigma
There has been an accident in the lab! Acid has spilled on your friend's lab coat and it is soaking through to his arm! You have the following chemicals in the lab: hydrochloric acid baking soda sulfuric acid and phosphoric acid available! What do you pour on your friend's arm to neutralize the acid? Explain why you would use that chemical.
Baking Soda because, it is a base. The baking soda would bring the pH level up to a 7. Then the solution will be solution.
When you have a pH of < 7 you have a(n) ________________.
Base
You are in the lab doing an experiment. Billy Eyelid is your partner. Billy Eyelids spills a liquid in her fingers. She tells you her fingers feel slippery and she complains that her music career is over because of this lab experiment. What substance did Billy Eyelids spill on her hand?
Base
Most bases taste __________.
Bitter
Which of the following is a base? a. HCl b. HF c. NaOH d. HBr
C. NaOH
Examine the following structure: What is the molecular shape of this molecule? a. Linear b. bent c. tetrahedral d. flat triangle e. pyramid
C. Tetrahedral
What is the chemical formula for carbon disulfide?
CS2
The symbols δ - and δ+ represent the partial _________ of a polar molecule.
Charge
You found a solution tested it and learned that is has a pH of 4.2. What is it considered to be?
It is an Acid
Where can we find the information about a mole of gold? a. By looking at the average mass of P on the Periodic table. b. By looking at the average mass of N on the Periodic table c. By looking at the average mass of Ag on the Periodic table. d. By looking at the average mass of Au on the Periodic table.
D. By looking at the average mass of Au on the Periodic table.
You have a beaker full of the solution of stomach acid (HCl). How do we show it as a solution in a chemical reaction? a. HCl (acid) b. HCl (solution) c. HCl (s) d. HCl (aq)
D. HCL (aq)
The reaction 2AlCl3 --> 2Al + 3Cl2 is a __________ reaction. (HINT: What type of reaction)
Decomposition
__________ Container in which Crystals are heated in.
Evaporating dish
A Brønsted-Lowry acid is defined as one that is a(n) __________.
H +
Which of the following is the correct Lewis structure of H2?
H:
The catalyst helps doing what in a chemical reaction?
Helps speed up the chemical reaction
__________ Crystal that has water inside of it.
Hydrate
What does the pOH scale tell us.
Hydroxide ion concentration
Examine the equation: pH + pOH = ___________?
It does equal fourteen
The solvent is important in a solution because ___________________.
It does the dissolving
What pH is considered neutral?
It is 7
Avogadro's number is _____________________.
It is also known as the Mole.6.022 x 10^23
Examine this structure X = X. What does the = represent?
It represents a double bond
Examine this structure H - H What does the - represent?
It represents a single bond
Examine the following structure : N ||| N What does the ||| represent?
It represents a tripple bond
Examine the following structure: X ||| X. What does the : represent?
It represents one set of unshared electrons
We use the symbol Δ tell us?
It tells us to use heat in the reaction
Problems to solve: Draw a dot diagram for H2O CO2 CH4 NH3
It will be here later on I still need to do
__________ Concentration unit we use in labs.
Molarity
Molarity is a unit of ______________________.
Moles
Nitrogen is a diatomic gas N2 . What is the correct structure for this molecule?
N :
Balance this equation: ____ N2 + ____ H2 → ____ NH3 and ____ H2O + ____ O2 → ____ H2O2
N2 + 3 H2 → 2 NH3 ,6 H2O + 3O2 →6 H2O2
__________ Acids and bases cancel each other out when they are combined.
Neutralization
Can we use the mole in our everyday life?
No, because it is a number way to big for us to use
Predict the shape of the molecule PH3.
Pyramidal
How many sigma and pi bonds are there in a molecule of N2?
Sigma 1 Pi 2
You are in the lab working with Billy Eyelash. Billy screams because acid has been spilled on her lab coat! What can you do immediately to help Billie?
Take of the coat
What is the mole in chemistry?
The atomic number
When you see an equation A+B --><--AB what does the --><-- tell us about the equation?
The chemical reaction can go both ways
Which of these pH values represents the most acidic solution?
The number < 7
If the pOH = 7 and the pH =7 what can we say about this?
This solution is neutral
__________ Lab process in which the unknown concentration of an acid can be determined using the known concentration of a base.
Titration
Choose the name for the chemical formula N2S5 • 3H2O.
Trihydrate
Which of the following correctly shows the electron bonds from the strongest to the weakest? Triple Bond Double Bond Single Bond
Triple Bond Double Bond Single Bond
The assumption that molecular shapes are largely determined by the repulsion of regions of electron concentration is known as the ____________ theory.
Valence-Shell Electron-Pair Repulsion (VSEPR)
This element has 183.84 grams per mole of atoms. What is the element symbol?
W
Two unshared electrons
When we see an atom that has the dot like Magnesium ( Mg : ) what are the dots?
Is this true that chemically speaking acids and bases are opposites of each other?
Yes they are both opposites of each other
Look at the Periodic Table. Does the Atomic Number of Copper tell you anything about the mole of copper?
Yes, it told us how much one mole of copper weighs
How many electron dots would Hydrogen (H) need to be completely full?
You would only have one
How many electrons would Bromine (Br) need to be completely full?
You would only have one
So if an acid donates (gives) a hydrogen atom we call that ___________________. a. protonation b. deprotonation
b. deprotonation
Neutralization happens when a(n) _________ combines with a(n) __________ and you get _________ and _______________. a. water; salt; base; acid b. base; salt; water; acid c. acid: base; water; salt
c. acid: base; water; salt