WorksheetsTopic 1: Round 2
Total questions: 22
Worksheet time: 24mins
Do forces between molecules exist in the gas state?
Yes
No
Yes & No
In which state can diffusion takes place?
solid
liquid
gas
liquid & gas
In which state diffusion occurs faster?
Liquid
Gas
What can make diffusion rate increase (faster) ?
Supply energy (temperature rise)
Remove energy (temperature drop)
The lower its ____________, the faster a gas will diffuse.
relative molecular mass
weight
temperature
Which has a higher relative molecular mass. Cl2 or O2 ?
Cl2
O2
Which has a higher relative atomic mass. H2 or He?
He
H2
You can change the state of substance from solid to liquid to gas, by ________ it.
heating
moving
shaking
What is kinetic energy?
energy of movement
energy of sound
energy of potential
When smoke particles are observed with microscope they are seen to move around randomly. This is called Brownian motion.
What causes Brownian motion?
Diffusion of the smoke particles
molecules in the air hitting the smoke particles
sublimation of the smoke particles
the smoke particles hitting the walls of the container
Oxygen and fluorine are gaseous elements next to each other in the periodic table.
Under the same conditions of temperature & pressure, oxygen diffuses ___________(1) than fluorine because its __________(2) is less than that of fluorine.
Which words correctly complete gaps 1 & 2?
faster (1), reactivity (2)
slower (1), molecular mass (2)
faster (1), molecular mass (2)
slower (1), reactivity (2)
Why is ammonia and concentrated hydrochloric acid is chosen for the diffusion experiment?
You may select more than 1 answer.
To see the white solid formation
To see the spreading of gas
To prove that gas can spread at different rate depending on their mass.
Which of the following describe solids?
You may choose more than 1 answer..
Strong forces of attraction between particles hence particles are packed very closely
has fixed and regular pattern
atoms vibrate in position but cant change position or move
have a fixed volume, shape and high density
as particles take in heat energy, the vibrations get larger and stronger. So the solid expands a little
I have weaker attractive force. I am sometimes close to my other friends. I can also move and slide past my friends which makes me special. I have a fixed volume but not a fixed shape. My density can be moderate to high.
Who am I?
I am a free spirit and like to go wherever I want. Nothing can stop me because the is no intermolecular forces that can hold me down. I love to be in random movement so I do not have a definite pattern. When I collide with my friends they can feel the pressure from me. I love being me because there is a of space around me. But sometimes people can catch me and compress me. When I am compressed the world seems so small. But anyhow I am very light with low density.
Can you give an example of the unknown character?
Melting is when a solid changes into a liquid.
Heat energy is required for the state change. Why?
Heat energy is transformed into kinetic energy allowing the particle to move
Heat energy is transformed into force energy allowing the particle to move.
You are sitting in the room. What is the room temperature normally?
The kinetic theory of matter explores the spatial relationship between the particles in solid, liquids, and gasses.
Which of the following processes causes the distance between particles to increase by the most
Melting
Freezing
Sublimation
Condensation
A student accidentally left a bottle of ammonia unclosed in the corner of a laboratory.
After a few minutes the entire laboratory smelled of ammonia.
Which process has occurred?
Brownian motion
Diffusion
Evaporation
Distillation
A small amount of Clorox was accidentally spilled on a kitchen floor. After a while it was observed that the floor appeared to be dry and the whole kitchen smelled Clorox.
Which process have occurred?
Evaporation and diffusion
Distillation and diffusion
Evaporation only
Evaporation and Brownian motion
In which changes do the particles move closer together?
3 and 4
1 and 3
4 only
1 and 2
A substance was analysed and was found to have a boiling point of 450oC.
At room temperature it is soft grey solid.
Which temperature could be the melting point of a pure sample of the substance?
-15 oC
56 oC to 72 oC
250 oC to 275 oC
142 oC
