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