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2 SO2 (g) + 2 CaCO3 (s) + O2 (g) ---> 2 CaSO4 (s) + 2 CO2 (g)
What mass (in g) of CaSO4 (s) do we produce?
A 25cm^3 portion of sample of a mixture of sodium carbonate and sodium hydroxide requiring 22.5cm^3 of 0.1mol/dm^3 HCL for titration with phenopthalein as an indicator. Calculate the volume of HCL required to completely nuetralise sodium carbonate
how many Cl atoms are in 0.0728 g of PCl3?
An atomic orbital represents:
a) The region of electron density for a covalent bond
b) The region of high probability for an electron around the nucleus of an atom
c) The shape of an atom
d) The repulsion of all the electrons among themselves
e) A fixed path that an electron follows around the nucleus of an atom
A proton in a linear accelerator has a de Broglie wavelength of (1.43x102) pm. What is the speed of the proton (in m/s)?
What is the energy of a photon (in joules) emitted during a transition from ni = (5.00x100) state to the nf = (2.00x100) state of the hydrogen atom?
- A sample of gas has a pressure of 1.45 atm at a temperature of 22 C. What would the pressure of the gas be if it is heated to 37 C?
A 100.0 g sample of liquid water at 0.0˚C
ends up as solid ice at – 10.0 ˚C. How much energy is involved in this change
Which would have a greater temperature change assuming the same amount of energy was absorbed, solid water at 0˚C or liquid water 0˚C?
A Carl Hayden chemistry student conducted an experiment using a crude soda can calorimeter containing 100 g of water. The student recorded an initial water temperature of 20 ˚C. After burning a 0.4 g sample of food under the can, the student observed a maximum temperature of 40 ˚C.
Determine the amount of energy transferred from the food sample to the water.
Given m = 100 g is the mass of water warmed up.
C = 4.18 J/g˚ , Heat capacity (C) of liquid water
change in temperature = final temperature - initial temperature
Find Q =?
Use Q=m x C x change in temperature
Plug in the values in the above equation and calculate
