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Physical Chemistry
Calculate the specific heat of lead if it takes 1.45 kJ of energy to heat 750g of lead from 25.0 C to 40.0 C
Physical Chemistry
what amount of heat energy (in kJ) is required to warm 250g of water from 20.0 C to 40.0 C ?
The specific heat of water is 4.184 J/gxC
The specific heat of water is 4.184 J/gxC
Physical Chemistry
what is the electrolyte
Physical Chemistry
the distribution of electrons in diffrent shells of an element with atomic number 25 is?
Physical Chemistry
Ions are more stable than atoms . why?
Physical Chemistry
In all the following questions, assume that the densities and specific heat capacities of the solutions are the same as pure water
i.e. ρ = 1.0 gcm-3 and c = 4.18 Jg-1K-1
1. Zinc will displace copper from copper (II) sulphate solution according to the following equation:
CuSO4(aq) + Zn(s) Cu(s) + ZnSO4(aq)
If an excess of zinc powder is added to 50 cm3 of 1.0 moldm-3 copper(II) sulphate, the temperature increases by 6.3 oC. Calculate the enthalpy change for the reaction.
i.e. ρ = 1.0 gcm-3 and c = 4.18 Jg-1K-1
1. Zinc will displace copper from copper (II) sulphate solution according to the following equation:
CuSO4(aq) + Zn(s) Cu(s) + ZnSO4(aq)
If an excess of zinc powder is added to 50 cm3 of 1.0 moldm-3 copper(II) sulphate, the temperature increases by 6.3 oC. Calculate the enthalpy change for the reaction.
Physical Chemistry
Why does the graph of rate of effusion versus time exponentially decrease with pressure?
Physical Chemistry
a sample of zinc is placed in the ice calorimeter. if 0.0657 g of zinc causes a decrease of 0.109 ml in the in the ice/water volume of the calorimeter, what is the enthalpy change, per mole of zinc, for the below reaction?
Zn+2H*(aq) --> Zn*(aq)+H2
"H" charge is "+1"
"Zn" charge is"+2"
Zn+2H*(aq) --> Zn*(aq)+H2
"H" charge is "+1"
"Zn" charge is"+2"
Physical Chemistry
A weather balloon at Earth’s surface has a volume of 4L at 302K and 751mmHg. If the balloon is released and the volume reaches 4.02 L at 730 mmHg, what is the temperature?
Physical Chemistry
True or False:
If the pH of a solution is 10, its pOH is 4.
NaOH is a strong base. The [OH-] of a 0.10M NaOH solution is 0.010M.
In a titration in which an acid-base indicator is used, the color of the indicator always changes at the equi alence point of the titration.
A solution of a salt of a strong acid and a weak base will be slightly acidic.
Buffers are solutions that resist changes in pH when limited amounts of acid or base are added.
Acetic acid, a weak acid, and sodium acetate, a salt, form an amphoteric solution when they are dissolved in water.
The process of the anions of the dissociated salt accepting hydrogen ions from water or the captions of the dissociated salt donating hydrodgen ions to water is called ion-product constant for water.
If the pH of a solution is 10, its pOH is 4.
NaOH is a strong base. The [OH-] of a 0.10M NaOH solution is 0.010M.
In a titration in which an acid-base indicator is used, the color of the indicator always changes at the equi alence point of the titration.
A solution of a salt of a strong acid and a weak base will be slightly acidic.
Buffers are solutions that resist changes in pH when limited amounts of acid or base are added.
Acetic acid, a weak acid, and sodium acetate, a salt, form an amphoteric solution when they are dissolved in water.
The process of the anions of the dissociated salt accepting hydrogen ions from water or the captions of the dissociated salt donating hydrodgen ions to water is called ion-product constant for water.
