At equilibrium in a clsoed system, whcih two processes occur at the same rate.
\r\n","choices":[{"text":"Melting and freezing
\r\n","value":"A"},{"text":"Evaporation and boiling
\r\n","value":"B"},{"text":"Evporatin and condensation
\r\n","value":"C"},{"text":"Sublimation and condensation
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066167,"question":"What is vapour pressure.
\r\n","choices":[{"text":"Atomospheric pressure.
\r\n","value":"A"},{"text":"Pressure exerted by aliqudi at 0 oC
\r\n","value":"B"},{"text":"pressure exercted by vaporus in equilibrium with their liqudi at a given temperature
\r\n","value":"C"},{"text":"Pressrue inside the liquid only
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066166,"question":"Earthenware pots keep water cool because.
\r\n","choices":[{"text":"They are made of clay
\r\n","value":"A"},{"text":"They reflect sunlight
\r\n","value":"B"},{"text":"They absorb water
\r\n","value":"C"},{"text":"They allow water to wvaporate through pores
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066165,"question":"Which of the following has greater viscosity than water
\r\n","choices":[{"text":"Glycerine
\r\n","value":"A"},{"text":"Hexane
\r\n","value":"B"},{"text":"Acetone
\r\n","value":"C"},{"text":"Methanol
\r\n","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":1066164,"question":"What is the SI unit of viscosity.
\r\n","choices":[{"text":"Pascal
\r\n","value":"A"},{"text":"kg m-1 s-1
\r\n","value":"B"},{"text":"Joule
\r\n","value":"C"},{"text":"Nm-2
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066163,"question":"Surface tension usually with interasig temperature.
\r\n","choices":[{"text":"Increase
\r\n","value":"A"},{"text":"Decrease
\r\n","value":"B"},{"text":"Remain constant
\r\n","value":"C"},{"text":"Doubles
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066162,"question":"What causes surace tension in liquids .
\r\n","choices":[{"text":"Gravity
\r\n","value":"A"},{"text":"Air Pressure
\r\n","value":"B"},{"text":"Intermolecular force between surface molecules
\r\n","value":"C"},{"text":"Temperatur edifference
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066161,"question":"Which of the following contribtes to water's high viscosity
\r\n","choices":[{"text":"Covalet bonds
\r\n","value":"A"},{"text":"Metallic interactions
\r\n","value":"B"},{"text":"Strong hydrogen bonding
\r\n","value":"C"},{"text":"Low surface area
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066160,"question":"Why is water's surface tension so high.
\r\n","choices":[{"text":"Due to its ioic nature
\r\n","value":"A"},{"text":"Because of hydrogen boding pulling surface molecules downward
\r\n","value":"B"},{"text":"Beacue it has low boiling point
\r\n","value":"C"},{"text":"Beacuse water molecules are very large
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066159,"question":"What is the value of water's enthalpy of vaporization.
\r\n","choices":[{"text":"21 kJ/mol
\r\n","value":"A"},{"text":"41 kJ /mol
\r\n","value":"B"},{"text":"30 kJ /mol
\r\n","value":"C"},{"text":"60 kJ /mol
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066158,"question":"What property of wate allows quals life to survive under frozen surface
\r\n","choices":[{"text":"High surface tension
\r\n","value":"A"},{"text":"High heat capacity
\r\n","value":"B"},{"text":"Ice floats and insulates water before
\r\n","value":"C"},{"text":"Low boiling point
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066157,"question":"What type of structue do water molecule sform in ice.
\r\n","choices":[{"text":"Linear
\r\n","value":"A"},{"text":"Hexagonal close packed
\r\n","value":"B"},{"text":"Regualr tetrahedral
\r\n","value":"C"},{"text":"Irregualr amorphous
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066156,"question":"Why does ice float on water.
\r\n","choices":[{"text":"It has lower density than water
\r\n","value":"A"},{"text":"It is heavier than water
\r\n","value":"B"},{"text":"It forms ionic bonds
\r\n","value":"C"},{"text":"It denser than water
\r\n","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":1066155,"question":"What happens to the volue of water when it freeze
\r\n","choices":[{"text":"It contracts by 9%
\r\n","value":"A"},{"text":"It remains the same
\r\n","value":"B"},{"text":"It expends by 9%
\r\n","value":"C"},{"text":"It evaporates completely
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066154,"question":"What happens to the voue of water when it freezes.
\r\n","choices":[{"text":"Because F is less electnegative
\r\n","value":"A"},{"text":"Beacue it is non polar
\r\n","value":"B"},{"text":"Because hydrogen bonding in HF traps the H+ ion
\r\n","value":"C"},{"text":"Beacuse HF is a gas
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066153,"question":"Why can a water molecule formtwo hydrogen bonds on avarage.
\r\n","choices":[{"text":"Beacuse it is polar
\r\n","value":"A"},{"text":"Due to its temperature
\r\n","value":"B"},{"text":"It has 2 hydrogen atm and 2lone pairs
\r\n","value":"C"},{"text":"Becuse it has a covalent bond
\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066152,"question":"What else is requrid on the electornegative atom for hydrogen bonding besides bonding to H.
\r\n","choices":[{"text":"Resonance
\r\n","value":"A"},{"text":"Lone pari of electrons
\r\n","value":"B"},{"text":"Doyble bond
\r\n","value":"C"},{"text":"Positive charge
\r\n","value":"D"},{"value":"E"}],"correctAnswer":2}]