Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password

Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

CHEM UNIT 2 PAST PAP Test

Enter the letter for the matching Answer
incorrect
1.
Which intermolecular forces exist between molecules of ethoxyethane?
incorrect
2.
The best piece of apparatus to accurately measure out 10.0 cm3 is a
incorrect
3.
How many moles of iodine were present in the solution of the iodine at the start of the experiment?
incorrect
4.
By considering the hydrogen bonding on these two solvents, suggest why 2-chlorobutane is more soluble in ethanol than in water.
incorrect
5.
Which of the terms above best describes what happens to the chlorine in the following reactions? Cl2(g) + H2O(l) → HCl(aq) + HOCl(aq)
incorrect
6.
Calcium nitrate decomposes like magnesium nitrate, higher temperature. Explain why the two nitrates have different stability to heat.
incorrect
7.
Which of these metal hydroxides is the most soluble in water?
incorrect
8.
The half-equation for the oxidation of ethanol is CH3CH2OH + H2O → CH3COOH + 4H+ + 4e- . to write a full equation for the overall reaction between acidified dichromate(VI) ions and ethanol.
incorrect
9.
Calculate whether the sulfur dioxide in this sample of air was within this limit. One mole of sulfur dioxide has mass 64.1 g.
incorrect
10.
In the reaction between Ag+(aq) ions and Fe2+(aq) ions, what would be the effect of increasing the concentration of Ag+(aq) ions? Ag+(aq) + Fe2+(aq)
incorrect
11.
One product of the reaction with potassium iodide is hydrogen sulfide, H2S. How does this show that iodide ions are more powerful reducing agents than bromide ions?
incorrect
12.
What colour would phenolphthalein turn at the end-point in this titration?
incorrect
13.
Butan-1-ol and three other alcohols, X, Y and Z, are isomers. Give TWO make when any one of the alcohols reacts with sodium.
incorrect
14.
Explain how a catalyst speeds up the rate of a reaction.
incorrect
15.
To identify the formation of the product when propan-1-ol has been partially oxidized, you can look for absorptions in the IR spectrum at absorption range
incorrect
16.
100 m3 air were passed through 100 cm3 I2, conc 0.0100 mol dm–3. The remaining iodine titrated with Nathiosulfate and reacted with ...
incorrect
17.
What is the oxidation number of nitrogen in ammonia, NH3?
incorrect
18.
Explain why the HNH bond angle is less than that for FBF.
incorrect
19.
Which of the following bond angles occur in a molecule of ethanol, C2H5OH?
incorrect
20.
Which of the following has dipole-dipole interactions between its molecules, but no hydrogen bonding?
A.
Provides alternative mechanism / route / pathway (1) Of lower activation energy (1) Hence a greater proportion of molecules can react (at a given T)
B.
I2 at start = 1 x 10-3 / 0.001 (mol)
C.
A pipette.
D.
104.5° and 109.5°
E.
3 electron pairs around central B atom but 4 electron pairs around central N
F.
12.60 cm3 of sodium thiosulfate, concentration 0.100 mol dm–3.
G.
Mg2+ / Magnesium ion smaller or fewer electron shells / greater charge density (1)OR Magnesium ion has same charge (as calcium ion) but is smaller (1) Causes more polarisation /distortion of nitrate/ anion (electron clouds) / N―O (bond)(1)
H.
Colourless.
I.
Effervescence / fizzing / bubbles (of colourless gas) (1) Mixture gets hot (1)
J.
disproportionation
K.
Rate of reaction increases, yield of Fe3+(aq) increases.
L.
Hydrogen iodide, HI
M.
Mass SO2 in 100 m3 =(64.1 x 3.70 x 10-4 ) (1) Mass SO2 in 1 m3 = 64.1 x 3.70 x 10-4 /100 = 237(.2) x 10-6 g = 2.37 x 10-4g (1) (= 237.2 / 237 / 240 μg)
N.
-3
O.
Energy must be at least EA for successful collision / for reaction (1) OR So more collisions have sufficient energy to react(1)
P.
3 CH3CH2OH + 2Cr2O72- + 16H+ → 3CH3COOH + 4Cr3+ + 11H2O ,3:2 ratio.
Q.
Water has 2 hydrogen bonds per molecule (on average) whereas ethanol only has 1 (1) ALLOW Water has more hydrogen bonds (per molecule) than ethanol Needs more energy to break H bonds in water (so less soluble) / H bonding
R.
Instantaneous dipole – induced dipole and permanent dipole – permanent Dipole.
S.
Barium hydroxide.
T.
To monitor whether all of the sample of propan-2-ol has been oxidized, you can look for.
Type the Answer that corresponds to the displayed Question.
incorrect
21.
This question is about boron and nitrogen compounds. Draw and name the shape of a boron trifluoride, BF3, molecule. Suggest the FBF bond angle.
incorrect
22.
Cl2(g) + 2Na(s) → 2NaCl(s)
incorrect
23.
The ability of a liquid to flow is linked to the strength of its intermolecular forces. Suggest which of these liquids flows the slowest when poured.
incorrect
24.
Which list below shows the compounds in order of increasing boiling temperature?
incorrect
25.
The hydroxide ion is acting as
incorrect
26.
Ammonia has the formula NH3. Its HNH bond angle is less than the FBF bond angle in boron trifluoride. Estimate the HNH bond angle in NH3.
incorrect
27.
What type of species forms when a bond breaks homolytically?
incorrect
28.
What colour would the mixture be after it was heated under reflux?
incorrect
29.
What volume of 0.200 mol dm–3 hydrochloric acid solution was added by the end-point?
incorrect
30.
The volume of barium hydroxide required was

edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how
Created by: ufuoma
Popular Chemistry sets