11. Differences between amino acids are normally due to differences in the amino group. A. true B. false

12. Which type of coal has the highest carbon content? A. anthracite
B. bituminous C. lignite

13. Carbon typically forms four covalent bonds A. true
B. false

14. The names of the straight-chain alkanes all end with the suffix . A. –ene
B. –ine C. –ane

15. Which of the following compounds has the highest boiling point? A. butane
B. butanoic acid C. butanal

16. Esters contribute which property to fruits? A. odor
B. color C. texture

17. Ethene is the monomer that is used as the building block in polyethylene. A. true
B. false

18. What does neutron absorption accomplish in a nuclear reactor? A. It slows down the reaction.
B. It speeds up the reaction.
C. It increases the rate of heat absorption.

19. The most penetrating form of radiation is . A. beta radiation
B. gamma radiation C. alpha radiation

20.How many termination code words are there? A. twenty
B. four C. three

21.
What is the product of a substitution reaction if the reactants are fluoroethane and sodium hydroxide?
A. ethanol and sodium fluoride
B. flouroethanol and sodium hydride C. ethane and sodium fluoride

We can’t you if you only tell us that you have to show us what the answers are

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

Bar graph

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer