g During a phase change, (large amounts/no/small amounts) of energy are being transferred into or out of the substance, even though the temperature of the substance is (decreasing/increasing/constant). [select the best answer in the parentheses to fill in the blanks] The beaker in experiment 2 is considered to be a (an) system. Energy could be entering the system from . Energy could be leaving the system through .

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

if you mean hydrogen and oxygen then water is the product

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !

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.