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Chemistry, 04.01.2020 20:31 mikeylaaliz5901
For future flvs student
what is the approximate boiling point of the substance represented by the complete heating curve below?
0°c
10°c
20°c
30°c <
the heating curve below shows the temperature change that occurs as a solid is heated. what is occurring at segment de of the graph?
melting
freezing
boiling< answer
condensing
the cooling curve below represents the cooling of a sample of gas. according to the diagram, what phase(s) would you expect to observe when the substance is at 300 kelvin?
gas
gas and liquid
liquid < answer
liquid and solid
when placed in a freezer, liquid water turns into solid ice. why is this considered a physical change?
the physical structure of the water molecules change as bonds are broken and atoms are rearranged.
only the motion and arrangement of the particles changes, not the identity of the substance. < answer
the water molecules react when exposed to the cold temperature, causing the atoms to separate.
only the arrangement of the atoms within the molecules changes, not the distance between them.
in which of these samples do the atoms have the greatest kinetic energy?
liquid iron (2,000°c)< answer
liquid iron (1,600°c)
solid iron (65°c)
solid iron (25°c)
describe in your own words, in terms of particle movement and energy, what occurs when a liquid is heated to its boiling point.
my answer got 4/4
it is a physical change, b/c the chemical identity of the matter doesn't change. just think about water: as it freezes, it is harder to move to less kinetic energy. so there is less free movement, and less kinetic energy as it freezes.
a scientist heats a sealed flexible container full of helium gas. what will most likely happen to the container as the gas absorbs heat?
it will shrink because the helium atoms will break apart into smaller pieces.
it will expand because the helium atoms will get larger.
it will expand because the helium atoms will move more quickly and get farther apart. answer
it will shrink because the helium atoms will lose energy as heat and move closer together.
which of the following expands to fill the container it is in but can be compressed to a smaller volume when pressure is applied?
solid iron
liquid bromine
neon gas< answer
sugar crystals
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For future flvs student
what is the approximate boiling point of the substance represen...
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