Chemical reactions
Balance the following chemical equation giving the coefficients as a list of numbers:
?C6H12O6 ( s )+ O 2 ( g ) → ? CO 2 ( g ) + ? H 2 O ( g)
1,6,6,6
Which of the following is a colligative propertie?
- Boiling point depression
-vapour pressure lowering
-increase in the freezing point
-pressure
vapour pressure lowering
Electronic configuration of fluorine
[He] 2s2 2p5
Define molarity
Moles of solute per volume of solution
Hydrogen peroxide
H2O2
Which of the following are chemical reactions?
1)H20(l) + NaOH (s) ⟶ NaOH (aq)
2)N2(g)+3H2(g)⟶2NH3(l)
3) CO2(g)⟶CO2(s)
2
Does vapour pressure lowering of a solvent when adding a solute depends on the type of solvent or the type of solute?
No
Electronic configuration of radium expressed in terms of radon.
[Rn]s2
How could you double the concentration of 4g/L of salt in water if you initially have 2L of it?
By evaporating 1 litre of water.
Silver nitrate
AgNO3
Endothermic or exothermic ? Write the corresponsing words separated with a coma, e.g. endothermic, exothermic, endothermic.
6 O 2 ( g ) → 6 CO 2 ( g ) + 6 H 2 O ( g )
CH4 + O2 → CO2 + H2O.
N2(g)+O2(g)+Heat→2NO(g)
exothermic, exothermic, endothermic.
Calculate the vapor pressure of a solution made by dissolving 50.0 g glucose, C6H12O6, in exactly 500 g of water. The vapor pressure of pure water is 47.1 torr at 37°C. GIve your answer to 3 correct significant figures.
46.6
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 7s2
Calculate the molality of a solution of 29 grams of sodium chloride (NaCl) dissolved in 1000 grams of water.
0.5 molal
potassium manganate
K2MnO4
How many moles of Fe2O3 will be produced with 4.5 moles of oxygen? Write just the final number.
4Fe +3O2→2Fe2O3
3
Vapour pressure and boiling point are related because
The boiling point is when the vapour pressure equals the atmospheric pressure.
Electronic configuration of selenium.
[Ar] 3d10 4s2 4p4
0.100 mole of NaCl is dissolved into 100.0 grams of pure H2O. What is the mole fraction of NaCl? Express your answer with the correct number of significant figures.
0.982
Ammonium phosphate
(NH4)3PO4
Consider respiration, one of the most common chemical reactions on earth. Write just the number.
C6H12O6+6O2→6CO2+6H2O (+energy)
How many moles of carbon dioxide will form in the reaction of 25 grams of glucose with 40 grams of oxygen? Give your answer to 2 significant figures.
0.83
The addition of 114 grams of sucrose to 1000 grams of water lowers the vapor pressure of water from 17.540 to 17.435. Calculate the molecular weight of sucrose in grams rounded to two significant figures.
340
Electronic configuration of copper
[Ar] 3d¹⁰ 4s¹
The freezing point of cyclohexane is 6.50 °C. A solution is prepared by dissolving 0.5580g of an unknown solute in 33.50 g cyclohexane. The freezing point of the solution is 4.32 °C. Calculate the molar mass of the unknown solute. Kf for cyclohexane is 20.0 °C.kg/mol. Give your answer to 3 significant figures.
153 g/mol
Name the following compound: BaO2
Barium peroxide