when a gas turns to a liquid the energy
of the particles
the energy of the particle which is kinetic is lower,
the vibration of the particle reduces, the intermolecular distance reduces and
intermolecular bonding increases
which of the following describes the process of freezing
freezing is conversion of substances from liquid state to the solid
state. e.g freezing of water.
the ...............of melting is freezing
the reverse of melting is freezing
vaporization is the reverse of
a)
condensation
b)
evaporation
c)
melting
d)
sublimation
the blank of melting is freezing
a)
reverse
b)
similarity
c)
end
d)
none of the above
particles of which of the following have the greatest
thermal energy
I.
ice
II.
water at 4°C
III.
ethanol
IV.
sugar cube
what two changes of state are involved in
freeze-drying
change from
water particles in gas coming off of a pan
of boiling water are moving
at
a)
higher kinetic
energy
b)
lower kinetic
energy
c)
normal kinetic
energy
d)
none of the above
when butter is heated it melts and when that butter
cools and solidifies the process is called
the process is
called freeze- drying
is freeze drying a physical or chemical change
a physical change
what is one advantage that freeze-dried
foods have over frozen foods
because of its
sweet taste, nutritive value[and long shelf life.
why do you think campers and
soldiers use freeze-dried foods
because of its sweet taste, nutritive value and
long shelf life.
why do campers and soldiers use freeze dried foods
because of its sweet taste, nutritive value[ and
long shelf life.
what is one advantage that freeze-dried foods have over frozen foods
because of its sweet taste, nutritive value and long
shelf life., while frozen foods will
spoil when the temperature of the
environment changes
is freeze-drying a physical change or a
chemical change explain
a physical change, because no new substance is formed.
suppose you have 100 kg of fresh strawberries. what would be the
a)
20kg
b)
40kg
c)
50kg
d)
none of the above
vapourisation and evaporation
why do you think campers and soldiers use freeze-dried foods
because of they sweet taste, nutritive value],
and has long shelf life.
what is one advantage that freeze-dried
foods have over frozen foods
because of its sweet taste, nutritive value and
long shelf life.
is freeze drying a physical or chemical
change
a physical
change
sublimation and boiling both happen at the surface of the substance
true or false
water particles in gas coming off of a pan of boiling
water are moving
a)
water molecules
b)
gaseous particles
c)
steam
d)
none of the above
sublimation and what both happen at the surface of the substance
a)
freezing
b)
evaporation
c)
boiling
d)
condensation
is vaporization the reverse of condensation
yes, vaporization conversion liquid to gaseous ,
whereas condensation is the conversation of gases to liquid state.
which of the following describes the process
of freezing
a)
melting of snow
b)
formation of ice blocks
c)
formation of dews
d)
all of the above
is boiling the reverse of freezing
no, boiling is the reverse of melting
what is the reverse
of freezing
condensation of the reverse of freezing
vaporization is the reverse of condensation
true or false
the........................... of melting
is freezing is condensation
reverse
or opposite
when a gas turns to a liquid the energy of the particles
the energy of the particle which kinetic reduces,
hence the intermolecular distance
shrinkles.
what is the total kinetic and potential
energy of the particles in an object
it is the mechanical energy of the obect or total
energy of the object.
evaporation and condensation are both types
of vaporization?
no , evaporation and vaporization change a liquid to gaseous state, while evaporation
begins in all temperature, vaporization
state at boiling point of liquid. condensation is the reverse of both process.
why does the evaporation of sweat cool your body on a
warm day
it reduced the body temperature by removing a heat in form of latent heat of vapourisation
from the body.
when matter changes state what two things are always conserved
mass and volume
how can the temperature of a substance remain the same even if
it is absorbing thermal energy
only at melting and boiling, where the heat are
converted to latent heat.
why does liquid water evaporate
it does when, an individual molecules , got kinetic
energy that can overcome the lattice energy and atmospheric energy.
which changes of state are characterized by
having atoms that gain energy? check all that apply.
a)
solidification
b)
liquefaction
c)
vapourisation
d)
none of the above
why you can step out of the shower into a warm
bathroom and begin to shiver
becuase your body temperature is higher than the surrounding temperature, when you
are out of the shower you begin to exchange eat with your environment which is
colder.
why do you shiver when you get out of the shower
becuase your body temperature is higher than the surrounding temperature, when you
are out of the shower you begin to exchange eat with your environment which is
colder.
describe how thermal energy and temperature are similar.
how are they different
thermal energy is part of heat used in doing work, it
is the sum of kinetic energy particles of
a substance, while heat is the measure of the average kinetic energy of
a substance, they are both related to the kinetic energy of the body . but
higher thermal energy does not translate to high temperature. for example a
large body can have a higher thermal energy than a smaller body as higher
temperature.
explain how a change in thermal energy causes matter to
change from one state to another
when the thermal energy of a body changes, the kinetic
energy of the individual particles of the body increases, this makes the
particles to vibrate at greater speed and more violently, eventually the crystal structure of substance
is weaken and the it collapse, and individual particle are now free to
translate, ( translation motion) if the substance is in solid it changes to
liquid and if in liquid the particles escapes as gases.
how are thermal energy and temperature
different
thermal energy is part of heat used in doing work, it
is the sum of kinetic energy particles of
a substance, while heat is the measure of the average kinetic energy of
a substance, they are both related to the kinetic energy of the body . but
higher thermal energy does not translate to high temperature. for example a
large body can have a higher thermal energy than a smaller body as higher
temperature.
list the three changes of state during which energy is absorbed
condensation, deposition, and freezing
what is the difference between thermal energy and heat
thermal is the total energy of a body while heat is
transient energy in motion.
object a has a higher temperature than object b which
statement must be true
a)
A has more
kinetic energy than B
b)
b has more
kinetic energy than A
c)
A has more
thermal energy tan B
d)
b HAS MORE
THERMAL Energy than A.
which temperature is always larger celsius or kelvin
CELCIUS IS LARGEER THAN KELVIN, because a celcius
degree is equal to 274kelvin.
that is
1°C = 1 + 0°C
= 1 + 273
= 274 kelvin
how are thermal energy and heat related
thermal energy is part of heat used in doing work, it
is the sum of kinetic energy particles of
a substance, while heat is the measure of the average kinetic energy of
a substance, they are both related to the kinetic energy of the body
how can the temperature of a substance remain the same
even if it is absorbing thermal energy
this only occur when it is at melting or boiling
point, that during phase changes.
does condensation absorb or release energy
condensation releases energy, when a gas changes to a liquid state , it as
to releases some of its kinetic energies so that its molecules can come
together to form a lattice. this is why
when gas is subjected to a lower temperature or freezing it condensed. this
process removes heat from the gas.
during which process do particles of matter
release energy
a)
freezing
b)
ionization
c)
recombination
d)
condensation
which statement best explains why heating
a liquid affects its viscosity?
kinetic energy of the particles changes , the
intermolecular distances increases,
force of attraction reduces . generally temperature decreases
viscousity.
which change results in an increase in
gas pressure in a balloon
a)
increasing volume
b)
increasing number
of moles
c)
decreasing temp.
d)
all of the above
which is a unit of pressure
the unit of
pressure
is
NM-2
pascal
mmHg
which is equal to the buoyant force on an
object
thee buoyant force or upthrust is equal to the weight
of fluid displaced
why do some balloons pop when they are left in sunlight for too long
the pressure of the
air in the balloon increases as a result of increases in temp ,
in which case will an object float
on a fluid
a)
when it density
is greater than that of the fluid
b)
when its density
is equal to that of the fluid
c)
when its density
is less than that of the fluid
d)
all of the above
in what state of matter do particles move at high speeds and
in all directions
a)
solid
b)
liquid
c)
gaseous
d)
plasma
what is equal to the buoyant force on an object
the weight of the fluid displaced,
during which process do particles of matter
release energy
a)
liquefaction
b)
condensation
c)
deposition
what property enables you to float a needle on water
Archimedes
principle , which state that “Any object, wholly or partially immersed in a
fluid, is buoyed up by a force equal to the weight of the fluid displaced by
the object.”
in which state of matter do particles
stay close together yet are able to move past one another
in liquid state
how does an increase in thermal energy affect molecules?
when the thermal energy of a body changes, the kinetic
energy of the individual particles of the body increases, this makes the
particles to vibrate at greater speed and more violently, eventually the crystal structure of substance
is weaken and the it collapse, and individual particle are now free to
translate, ( translation motion) if the substance is in solid it changes to
liquid and if in liquid the particles escapes as gases.
conduction can occur within a single
substance, but parts of the
substance must have which property?
a good conductor of heat and physical contact
which liquid is the most viscous? syrup
water milk apple juice
how does a foam-filled winter coat help keep
a person warm?
answer this question
a substance with a definite shape and volume is a phase of matter.
solid state
what must be true about two objects for conduction to take
place?
they must have thermal contact.
which substance has the most thermal
energy and will have the most heat flow from it?
a)
copper
b)
gold
c)
nickel
d)
iron
which best explains why metal cooking
utensils often have plastic coating on their handles?
to prevent conduction of heat and electricity through
the skin
what occurs when someone places an ice pack
on an injured ankle?
it slows the
rate of bleeding, the body temperature is lowered and this reduces the rate of
blood gushing out.
which best describes the energy change that
takes place during deposition?
energy is releases, because gases has more kinetic
energy than solid
which energy change occurs during boiling?
absorption of energy
what happens when the thermal
energy of a substance increases?
when the thermal energy of a body changes, the kinetic
energy of the individual particles of the body increases, this makes the
particles to vibrate at greater speed and more violently, eventually the crystal structure of substance
is weaken and the it collapse, and individual particle are now free to
translate, ( translation motion) if the substance is in solid it changes to
liquid and if in liquid the particles escapes as gases.
what happens when heat is removed
from water?
it freeze to ices, it
changes to solid state , the process is solidification
which statement best describes the
energy changes associated with evaporation and boiling?
latent eat of vapourisation, it an absorption of
energy.
in which changes of state do atoms lose energy?
melting , vapourization and ionisation
during which changes of state do atoms
overcome the attractive forces between them?
melting and vapourisation
during which changes of state does
the motion of the atoms decrease?
condensation and recombination
during which change of state would
the volume of a substance increase the most?
vapourisation
the process by which a gas changes
to a solid is
deposition
the process by which a solid
changes to a liquid is .
liquefaction
what happens during evaporation?
when the thermal energy of a body changes, the kinetic
energy of the individual particles of the body increases, this makes the
particles to vibrate at greater speed and more violently, eventually the crystal structure of substance
is weaken and the it collapse, and individual particle are now free to
translate, ( translation motion) if the substance is in solid it changes to
liquid and if in liquid the particles escapes as gases. this is called
evaporation
which statement best describes a physical change?
a change of state that does not change the chemical
property of the substance, e.g from ice to water and to steam.
which event always involves a chemical
change?
chemical reaction
which change of state is taking place?
when a sublime is formed
sublimation
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