EXAM REVIEW M NAME______________________
SEMESTER 2 EXAM REVIEW WORTH EXTRA PTS ON EXAM WHEN HANDED IN THE DAY OF THE EXAM; PLEASE ANSWER IN YOUR HANDWRITING.
. Register at chemthink.com using the registration number found on my website. Do the chemthinks from ch7 (ionic formulas only), ch8, ch 10, & ch11. (listed on my website) I am planning a review day in the computer lab, Monday may 24, for you to do some of them. I also suggest going to 'videos' on my website, and watching the videos from semester two.
BAKING SODA LAB
Hydrocloric acid is added to baking soda until the bubbling stops. Water, carbon dioxide, and salt are produced.Complete & balance the equation below:
NaHCO3( ) + ________ (aq) = ______ (l) + ______(g) + ________ ( )
This data was gathered: e. dish = 33.5g e.dish & b.s. = 39.9g e.dish & salt = 38.4g
In this reaction, __________ is the limiting reactant and _________ is the ________ reactant, because_______________________________________________________.
The bubbles were ______________, and ___________ was removed by heating.
After the reaction, but before heating, there was ___________ in the e.dish.
After heating there was, there was _______________ in the e.dish.
The mass of the salt was __________; the molar mass of salt is _______________.
The mass of the baking soda was _____________; the molar mass of b.s. is ___________
Was there more or less than 1 mole of b.s. used?________________
The moles of b.s. is _______________ work:_____________________________
Was there more or less than 1 mole of salt used?
The moles of salt is ________________ work:____________________________
The product’s names, formulas, and their molar masses were:
Product name formula molar mass
COMBUSTION OF MAGNESIUM
DATA: mass of crucible 17.48g
Mass of crucible and magnesium 18.52g
Mass of crucible and magnesium oxide 19.05g
Write the equation for the combustion of magnesium._____________________________
CONCLUSIONS:
1. Did the material in the crucible gain or lose mass?_________ why?__________________________________________________________
2. When wood burns, does it gain or lose mass?_______________ Why?__________________________________________________________
3. When iron rusts, does it gain or lose mass?______________ Why?____________________________________________________________
4. Is the law of conservation of mass violated by these situations? _____________ Explain how you would do an experiments to prove the law of conservation of mass.____________________________________________________________
5. What was the limiting reactant?_________ What was the excess reactant?______ How can you tell?___________________________________________________
6. The white smoke was_________. If it escaped, the % yield would have been ______________. If the magnesium was not heated long enough, the percent yield would have been __________.
OTHER COMBUSTION REACTIONS
The word combustion means_______________________; during combustion of a hydrocarbon, one reactant is always _________ and the 2 products are always _____________ and ____________.
Write a balanced chemical equation for the combustion of propane C3H8
Molar masses : ______ _____ __________ ________
equation : C3H8 + _______ = ___________ + _________
Moles present: 2mol ___mol _____ mol ____mol
Grams present: ___g ____g _____ g _____ g
Write the molar masses above each chemical.
We have 2 moles of propane present; write moles of everything else below the chemical.
Change each of the moles present into grams present below the chemical.
When a hydrogen balloon is exploded in the lab, what is the limiting reactant?________
What is the excess reactant?__________
How do you know?_____________________________________________________
Write the equation for the combustion of hydrogen gas.___________________________
CHEMICAL EQUATIONS
Some metals react with acids to produce ___________ gas; some do not react with acids. If we have an_________________(p266)we can predict which will react, and which will not. The metals below ________________ do not react with acid. When an acid reacts with a metal, the type of reaction (of the 5) is ______________________.
Write a balanced chemical equation for the reactions below; if there is no reaction write only the reactant formulas and NR.
Hydrochloric acid and sodium_______________________________________________
Hydrochloric acid and aluminum
Hydrochloric acid and copper________________________________________________
FORUMULAS AND NAMES
FOR THIS COLUMN: FOR THIS COLUMN:
First, write the ions* (1pt), then,
GIVE THE FORMULA (2PT) First, circle the acid formulas and box the
(* no ions in covalent compounds) binary compound formulas (1pt)
then,GIVE THE NAME (2PT EACH)
magnesium sulfide H2SO4
copper (I) nitrite FePO 4
aluminum Iodide CsCl
carbon tetrachloride HF
nitric acid CrSO3
calcium chloride CuCO3
iron(III) nitrate LiF
sodium oxide MgI
dinitrogen trioxide P2O5
hydrochloric acid Ba(OH)2
CLASSIFYING CHEMICAL REACTIONS
Based on your lab experience list 3 signs of a chemical reaction: _________________,
_______________________, and ____________________________________.
When potassium metal is mixed with a solution of hydrochloric acid, the flask gets hot and a gas is produced which pops when tested with a flaming splint. The gas is _______. Why was the collecting tube held upside down for this gas?_______________________
Are these endo or exothermic reactions? _________________
Classify the burning gas reaction as one of the 5 types ___________________________
Fill in the missing reactant & states; then balance, then classify as one of the 5 types.
K( ) + HCl( ) = KCl(aq) + ___ (g) classify_____________________
If the liquid remaining at the end of this metal-acid reaction were boiled to dryness, what, if anything, would be left?______________________________.
Joe Science mixes a solution of sodium hydroxide with a solution of copper II chloride. A white solid appears and settles on the bottom of the test tube; the test tube gets cold. What is a general name for a solid that falls out of a solution reaction? _____________. Is the solid formed in this reaction soluble or insoluble? ___________________. What is the formula of this solid? __________. Is this reaction endo or exothermic? ____________
Classify this reaction as one of the 5 types___________________________________
Fill in the missing reactant and states; then balance.
NaOH( ) + CuCl2( ) = _______(aq) + Cu(OH)2(s)
¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬Joe’s mom comes into the room to clean up. She sees the liquid with the white solid, thinks it is alkaseltzer, and drinks only the liquid. She says ‘this tastes like___________’
Explain why fluorine gas cannot be generated by the decomposition of water. _________________________________________________________________
A spark is put into a test tube of hydrogen; the test tube of hydrogen is on the moon. What will happen?________ Why?________________________________________
When hydrogen burns in air, __________________ is produced.
Hydrogen peroxide (H2O2) is mixed with yeast. Bubbles appear which cause a glowing splint to relight. What is the gas?_______. The yeast was a _______________ that
___________________ the reaction. In this reaction, the other product must contain
Hydrogen peroxide is kept in a brown bottle because__________________________
Classify this reaction as one of the 5 types___________________________________
What type of water did the lead II nitrate react with?_______ why? _________________
SOLUTIONS----------------------------------------------------------------------------------------------------------
Saltwater is a ______________ made of the solute, __________ and the solvent, __________________. When we put it in the the oven the ________________ left, leaving the __________ in the dish. The molar mass can be found on the __________________. Moles is found by dividing _________ by the ___________; Molarity is found by dividing _________ by _________. Permanent marker is not soluble in _______________, but is soluble in ______________. Of the two solutions we did in the lab, _______________ was more concentrated than ______________; Of the tw0 solutions below, _____________________ is the most dilute.
SOLUTION DATA:----------------------------------------------------------------------------------------------------
PART 1 NaCl (aq) KCl(aq)
Mass e dish 35.68g 35.68g
Mass e dish & solution 47.42g 46.54g
Volume of solution 7.6mL 8.5mL
Mass e dish & solute 38.26g 37.71g
PART 1 show work and label
Mass solute
Molar mass
Moles solute
Liters of solution
Experimental molarity
mass of water in g
mass of water in Kg
PHASE CHANGES
USE THESE CHOICES : solid liquid gas solid & liquid liquid & gas
steam
ice
Most ordered phase
Most dense phases
Phases that are relatively incompressible
Phases that diffuse rapidly
Has an indefinite shape and a definite volume
Has the most distance between particles
Phases are fluid
Particles vibrate about a fixed point
CHOICES: melting sublimation freezing condensation deposition vaporization
Solid to gas
Gas to solid
Liquid to gas
Solid to liquid
Liquid to solid
Gas to liquid
Dry ice and iodine are examples
Frost in an example
Para dichlorobenzene in our lab was an example
2 that occur at the same temperature
requires energy to be added (3)
PHASE CHANGE LAB
We heated water, once it reached ___________ its temperature did not go up, even when we were heating it. This is because the heat was being used to change ________ to ____.
When we plotted this information on a graph, we could see a ___________ that indicated the phase change. When water boils, the bubbles are ___________. Many people think the bubbles are _________ and __________; if that were true, it would be dangerous to boil water!
When we cooled water we used salt and ice. Salt ________ the melting pt of water; the salt ice mixture reached about ________ degrees C. When we put the test tube of water in this bath, the temp went down; When we plotted this information on a graph, we saw a _________ at ________ degrees C; this showed us the ___________ pt of water.
Paradiclorobenzene is a ________ at room conditions, but a _________ at 95 degrees C.
Its uses include ________________ and ______________________. The temperature went down; When we plotted this information on a graph, we saw a _________________ at _____________ degrees C; this showed us the _____________pt for paradiclorobenzene.
GRAPHING
LABEL THIS GRAPH USING THE FOLLOWING CHOICES:
Boiling pt.
Freezing pt
Initial temp.
Final temp.
Melting pt.
LABEL THIS GRAPH USING THESE CHOICES:
Solid only
Solid and liquid
Liquid and gas
Liquid only
Gas only
On graph paper draw 3 curves of different colors; red for water heated from 20 degrees C to 100 degrees C; blue for water cooled from 40 degrees C to –20 degrees C; and pencil for paradiclorobenzene cooled from 95 degrees C to 20 degrees C
Choose: acid, base, both ,neither for the following:
Taste sour , taste bitter , can burn , produces hydroxide , ions ph of 7, ph of 9, detected by indicators, involved in neutralization, water
Thermochemistry: choose: conservation of energy, activation energy, physical change, chemical change, density of water, catalyst, carbon
Seniors not responsible for the following
type of change in metal lab, change in peanut lab, speeds up chemical reaction, used to find the mass of water, 1g/mL, black stuff on soda can, all the heat lost equal heat gained
------------Use this data for the following : 50g of metal is taken from a boiling pot of water and placed in 80mL of water at 20 degrees C. The temperature goes to 24 degrees C. What is the final temp of the metal? The final temp of water? Change in temp for metal? Change in temp for water? What is the mass of water used? Which has more energy a gram of carbohydrate or a gram of fat?
organic chemistry: choose from methane, butane, propane, methanol, propanol, ethanol for the following: 4 carbons, 3 carbons, in lighters, in Bunsen burners, fermented from fruits and grains, simplest alcohol, rubbing alcohol, gas grills, natural gas
------------ choose from these: saturated fat, unsaturated fat, esters for the following: single bonds, least healthy, fragrance and flavor, solid, vegetable oil, unsaturated fat + hydrogen, acid + alcohol
nuclear chemistry: choose from fission, fusion, both, neither for the following:
heavy element split, matter converted into energy, by products include radon, desired as future energy source, lighter elements combined, requires high temp, first nuclear bombs, occurs on the sun, requires critical mass, a lot of radioactivity, nucleus not involved, involves protons and neutrons