Which help you ensure that temperature readings are accurate? Check all that apply. shaking the thermometer before use using the thermometer as a stirring rod making sure that the liquid inside the thermometer is at eye level when taking the temperature making sure that the bulb of the thermometer does not touch the bottom the beaker or the ice when taking the temperature using the Celsius scale instead of the Fahrenheit scale when taking temperature readings

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

it is b that is the answer.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.