paper 2 questions Flashcards
why is thermometer adequate to determine the enthalpy change
temperature change is bigger than uncertainty
carbon monoxide reacting with nitrogen monoxide in a catalytic converter
2CO + 2NO -> 2CO2 + N2
suggest why anti-bumping granules prevent bumping?
from smaller bubbles
give one reason why bonds in molecules such as CO2 and 1,1,1-trifluoroethane absorb infrared radiation
bonds vibrate
Suggest why the student chose not to carry out experiments at temperature in the range of one to 10°
Reaction will take a long time
What is stereoisomerism?
Molecules with the same structural formula but different arrangements of atoms in space
Why is the plasticiser used in PVC?
Makes it more flexible
Why is the plasticiser used in PVC?
Makes it more flexible
What statement is correct about thermal cracking?
A. A pressure between 100 and 200 kPa is used.
B. Aromatic hydrocarbons on a major products.
C. C-C are broken.
D. Zeolite Catalysts are used.
C. C-C are broken.
What statement is correct about the production and use of ethanol as a biofuel?
A. Biofuel ethanol is produced by the fermentation of glucose in a presence of yeast and air.
B. Ethanol is purified by fractional distillation.
C. Carbon dioxide is released when bioethanol was burned.
D. Bioethanol burns with a clean flame ethanol made by hydration of Ethane
B. Ethanol is purified by fractional distillation.
Explain why PVC melt that a higher temperature of chloroethene
They have larger intermolecular forces
Longer molecule
Which statement is correct for the distribution curve of molecular energies in a gas?
A. The curve is symmetrical about the maximum.
B. There are always some molecules of zero energy.
C. The position of a maximum of a curve is not dependent on the temperature.
D. The mean energy of a molecules is greater than the most probable energy of the molecules.
D. The mean energy of a molecules is greater than the most probable energy of the molecules.
Explain in terms of collision theory, the effect of increasing a concentration of hydrogen peroxide and a rate of reaction
- More particles
- Frequency of successful collision
Explain why nonane has a higher boiling point than 2,4-dimethyl heptane
- nonane molecules packed close together
- More branches so weaker Vander Vaal forces
describe the hydrogen bonding in propan-1-ol
- attraction between a lone pair
- a delta + of OH on another molecule
