Which of the following represents a phase change? a. melting b. crushing c. expanding d. burning

Melting.

Explanation:

Phase change is when a state of a matter changes to another.

For example

a) conversion of solid to liquid : It is a phase change known as melting.

b) conversion of liquid to solid: it is a phase change known as freezing.

c) conversion of solid to gas : It is a phase change known as sublimation.

d) conversion of gas to solid: it is a phase change known as solidification.

e) conversion of liquid to gas : It is a phase change known as vaporization.

f) conversion of gas to liquid: it is a phase change known as liquefaction.

The other options are not phase change

crushing: it simply conversion of a large particles of solid to smaller

expanding: it is again conversion of a gas to higher volume gas

burning: it is a chemical change where a substance undergoes burning.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.