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Physical Chemistry
What is the de broglie wavelength of a He-atom in a container at room temperature?
Physical Chemistry
"water sample a boils at 100degree celcius and sample b boils at 102 degree celcius which sample of water will not freeze at o degree celsius explain"
Physical Chemistry
What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition from n=4 of He+ spectrum. [Rh=109700cm^-1]
Physical Chemistry
what is the weight of oxygen and methane required to produce 112 mili liter of carbon dioxide by NTP?
Physical Chemistry
A SUBSTANCE BOILS AT 253 K.WHAT HAPPENS WHEN PRESSURE IS APPLIED TO IT AT 240 K?
WHAT IS THE REASON?
WHAT IS THE REASON?
Physical Chemistry
Hello, I'm self-studying for the Chemistry IGCSE. I don't have any chemical background and very limited options for tutors in this country, I'd greatly appreciate it if someone can check some questions.
Substance Melting Point / C Boiling Point? C Density / g cm - 3
A 1110 2606 9.1
B -266 -252 0.07
C 40 94 1.6
D -14 60 0.9
1. Which substance is a gas at room temperature? B
2. Which substance is a liquid at room temperature? D
3. Which substances are solids at room temperature? C, A
4. Which substance is most likely to be a metal? A
5. Which substance will be a liquid at -260 degrees Celsius? B
6. What is the melting point of the least dense non-metal? -266 degrees Celsius?
7. Which substance is a gas at 72 degrees Celsius? D
Substance Melting Point / C Boiling Point? C Density / g cm - 3
A 1110 2606 9.1
B -266 -252 0.07
C 40 94 1.6
D -14 60 0.9
1. Which substance is a gas at room temperature? B
2. Which substance is a liquid at room temperature? D
3. Which substances are solids at room temperature? C, A
4. Which substance is most likely to be a metal? A
5. Which substance will be a liquid at -260 degrees Celsius? B
6. What is the melting point of the least dense non-metal? -266 degrees Celsius?
7. Which substance is a gas at 72 degrees Celsius? D
Physical Chemistry
Question 1:How much energy (in kilojoules) is needed to heat 5.40g of ice from -12.5∘C to 28.5∘C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.
Question 2:How much energy (in kilojoules) is released when 7.55g of water at 31.0∘C is cooled to -13.0∘C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.
Question 3:What is the vapor pressure of CS2 (in mm Hg) at 29.5∘C? Carbon disulfide, CS2, has Pvap = 100mm at -5.1∘C and ΔHvap = 28.0 kJ/mol.
Question 4:Assuming that the heat capacities don't change with temperature, how much energy in kilojoules is needed to heat 7.60g of Hg from a temperature of -58.0∘C to 51.0∘C?
Question 2:How much energy (in kilojoules) is released when 7.55g of water at 31.0∘C is cooled to -13.0∘C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.
Question 3:What is the vapor pressure of CS2 (in mm Hg) at 29.5∘C? Carbon disulfide, CS2, has Pvap = 100mm at -5.1∘C and ΔHvap = 28.0 kJ/mol.
Question 4:Assuming that the heat capacities don't change with temperature, how much energy in kilojoules is needed to heat 7.60g of Hg from a temperature of -58.0∘C to 51.0∘C?
Physical Chemistry
the vapour pressure of h20 at 20degrees Celsius is 17mmhg.calculate the vapour pressure of solution of 3g of urea in 50g of water
Physical Chemistry
calculate the volume of oxygen that would be required to covert 5litre of carbon monoxide into carbon dioxide
Physical Chemistry
dishwshing liquid is a liquid right? what can you add to make the dishwshing liquid a gel? and how can you make the liquid a thick viscosity?
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