PLZ HELP FAST 2. Create a timeline of the history of the microscope and the cell theory. Explain what each of the scientists contributed and put them in order from early to recent dates. Include the dates and summarize their contributions. 3. Zacharias Jensen 4. Antonie Van Leeuwenhoek 5. Robert Hooke 6. Robert Brown 7. Schleiden 8. Schwann 9. Virchow 10. Remak 11. Walter Flemming 12. Ernst Rushka 13. Paul Kirkpatrick 14. Watson & Crick 15. Any other important contributors? I​

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

i believe the answer is 5,000