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S1 Particles of Matter
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If I mix 50mL of water and 50mL of ethanol, will I have more than, less than, or exactly 100mL in total?
Less than - some ethanol will evaporate and we will be left with less.
If I mix 50mL of peas and 50mL of sand, will I have more than, less than, or exactly 100mL in total?
Less than 100mL - the sand can fit into the gaps between the peas!
I have a melting point of -37oC and a boiling point of 250oC. Am I a solid, liquid or gas at room temperature?
Liquid
I have a melting point of -200oC and a boiling point of -95oC. Am I a solid, liquid or gas at room temperature?
Gas
I have a melting point of 600oC and a boiling point of 1200oC. Am I a solid, liquid or gas at room temperature?
Solid
True or false: gases do not have a fixed shape.
True!
True or false: salt melts in water
False! It dissolves.
Which of these liquids evaporate faster: water or ethanol?
Ethanol
Describe what a control variable is.
Something we keep the same / constant throughout an experiment.
Describe what an dependent variable is.
Something we measure in an experiment.
Describe what an independent variable is.
Something we change in an experiment.
Name the purple particles which sublime when heated
Iodine
What does sublimation mean?
When a solid directly changes into a gas?
Name the state change from gas to liquid
Condensation
Name the state change from liquid to gas
Evaporation / boiling
Name the state change from solid to gas
Sublimation
Name the state change from solid to liquid
Melting
What does this symbol mean?
Irritant
What does this symbol mean?
Toxic
What does this symbol mean?
Corrosive
What does this symbol mean?
Flammable
True or false: the melting point of water is 100 degrees C.
False
Describe what happens when something freezes.
It turns from a liquid into a gas / the particles come closer together and make a fixed shape.
What is evaporation?
When the surface of a liquid changes into a gas.
What is condensation?
When a gas changes into a liquid.
What is the boiling point of a substance?
The temperature at which a liquid changes to a gas.
What is the melting point of a substance?
The temperature at which a solid changes to a liquid.
Why can I not use a Bunsen burner to boil ethanol?
Because it is a flammable liquid.
Describe the arrangement of atoms in a gas.
Atoms have a lot of space between them and are far apart.
Describe the arrangement of atoms in a liquid.
Atoms are close together with no fixed shape and can flow over one another.
Describe the arrangement of atoms in a solid.
All atoms are close together in a fixed shape
Describe what diffusion is.
When particles moves from a high concentration to a low concentration.
State one thing that gases can do that solids and liquids cannot.
They can be compressed.
When atoms join together, what do they form?
Molecules (or compounds)
Everything is made up of what small type of particle?
Atoms
Name the 3 states of matter.
Solids, liquids and gases
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