WorksheetsT3W4 Thu (Y11 Chemistry)
Total questions: 10
Worksheet time: 48mins
When water changes from a solid to a liquid, which bonds are breaking?
Covalent bonds
O-H bonds
Dispersion forces only
H-bonding only
Dispersion forces and H-bonding
Which of the following is not a reason that water has a higher melting point than NH3
The dipoles in H2O are stronger than those in NH3
H-O bond is more electronegative than H-N bond
Water stacks better to optimise attraction between molecules
H2O has more H-bonds per molecule
Think of a pond (water) and the dirt next to the pond as having the same heat energy from the sun and the same mass. Over 30 minutes, the temperature of the dirt heats up more than the water. What can be concluded?
Water has a lower heat capacity than dirt
Water has a higher heat capacity than dirt
Water has the same heat capacity as the dirt
You cannot compare the heat capacity of water and dirt
The amount of heat energy released by 100.0 g piece of glass (heat capacity = 0.84 J g-1 K-1) that cools from 900.0 deg C to 25.00 deg C is:
Please write your answer in joules, with no units like this: -45000
(a)
Calculate the starting temperature of a 375.0 g beveridge (assume all water) that absorbed +23 512.5 J of energy to someone's hand and ended up at 15.00 deg C.
Please write your answer with 1 decimal place and no units like this 10.2
(a)
Amy was having a bath that contained 900.0 L (assume 1.0 L = 1000.0 g) of water at 38.0 deg C. She wanted to warm it up to 42.0 deg C.
How many litres of hot water would she need to add if the hot water out of the tap is at 55.0 deg C?
Answer to correct number of significant figures with no units (eg. 356.4) and not in scientific notation
(a)
If CH3CH2OH dissolves in water, what can be concluded about the solute and solvent bonds?
H-bonding must not be occurring between the solute and the solvent
The solute and solvent do not interact strongly
CH3CH2OH••••H2O bonds are weaker than the sum of CH3CH2OH••••H2OCH3CH2OH and H2O••••H2O bonds
CH3CH2OH••••H2O bonds are stronger than the sum of CH3CH2OH••••H2OCH3CH2OH and H2O••••H2O bonds
Which of the following solvents will ethyl ethanoate have the highest solubility?
Which of the following ions is rarely soluble in water?
K+
NO3-
CH3COO-
NH4+
Al3+
In a solution containing the following ions, what precipitate(s) is/are likely to form?
NH4+, NO3-, V+, K+, CH3COO-
None
VCH3COO
VNO3
KNO3
NH4CH3COO
