Unit 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what is water made up of | atoms
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| atoms | basic building block of matter that make up everyday objects
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| atom+atom= | molecule
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| how to atoms form molecules | they attach or bond together
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| what is chemical formula for water | H2O
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| what charge does hydrogen have | positive
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| what charge does oxygen have | negative
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| why is water a polar substance | it has positive and negative charged atoms
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| 3 properties of water | surface tension, capillary action, universal solvent
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| surface tension | tightness across the the surface of water caused by molecules pulling on each other
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| what shape are the water molecules forced to make | a domed shape
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| cohesion | water molecules stick together like magnet opposites attract
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| capillary action | combined force of attraction among water molecules and the molecules of surrounding material
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| what does capillary action allow water to do | move through material with pores or narrow space
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| adhesion | water molecules stick to other substances
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| universal solvent | water because it is a substance that dissolves many other substances
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| why is water known as the universal solvent | because it dissolves many other substances
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| a polar substance like water can dissolve | other polar substances like sugar and food coloring
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| why can't water dissolve oil or wax | because they are non-polar substances
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| solvent | a substance that dissolves other substances
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| solute | the substance that gets dissolved
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| solution | a mixture that forms when one substance dissolves another
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| what is the quote | you put the solvent in the solute of the solution
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| how many hydrogen molecules in water | 2
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| how many oxygen molecules in water | 1
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| why are water molecules cohesive | because the positive hydrogen atoms attract the negative oxygen atoms
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| what is it called when water molecules stick to other substances | adhesion
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| what causes surface tension in water | the molecules pulling on each other
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| what substance can break surface tension in water | soap
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| examples of capillary action | celery absorbing food coloring, paper towel absorbing water
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| two substances that do not dissolve in water | oil and wax
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| ice tea dissolved completely in water | universal solvent
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| bug walks on water without sinking | surface tension/cohesion
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| tried to mix oil with water but didn't mix | universal solvent
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| rain ran down window and cam together to make larger drops | cohesion
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| paper towel soaked up spill | capillary action/adhesion
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| blue die went up petal on flower | capillary action/adhesion
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| water sticks to side of cylinder to form meniscus | adhesion
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| water moves from roots of plants to leaves of plants | capillary action
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| oil does not dissolve in water | water is polar and oil in non-polar
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| what are the 5 phase changes of matter | freezing, melting, evaporation, condensation, sublimation
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| freezing | matter starts as a liquid, atoms move slower and matter changes to solid
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| melting | matter starts as a solid, atoms move faster and matter changes to liquid
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| evaporation | matter starts as a liquid, atoms move faster and matter changes to gas
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| condensation | matter starts as gas, atoms move slower and matter changes to liquid
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| sublimation | matter starts as a solid, atoms move faster and matter changes to gas
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| an example of sublimation | dry ice carbon dioxide
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| energy freezing | liquid to solid, released/lost
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| energy melting | solid to liquid, absorbed/gained
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| energy evaporation | liquid to gas,absorbed/gained
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| energy condensation | gas to liquid released/lost
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| energy sublimation | solid to gas, absorbed/gained
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| gas to liquid to solid | energy removed
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| solid to liquid to gas | energy added
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| example of evaporation | cup of water in the summer, ocean water - water cycle, tea kettle, pool water gets lower
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| examples of condensation | water inside the pot lid when boiling, steam in shower hit cold mirror and loses heat, cloud in atmosphere
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| why did the liquid on the white board evaporate | warm air hits the cold board and the water absorbs energy turning it into a gas, evaporation occurs
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| why did your hand feel cool when a drop of alcohol was placed on it | liquid alcohol touches your warm hand and absorbs energy from it, the liquid turns into a gas
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| why did water collect on the outside of the glass of ice water | warm air hits the cold glass, and it loses energy, turning it into a liquid as condensation occurs, air has water in it.
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| explain why on a hot day your body is cool when you get out of pool | water sticking to your body absorbs heat energy from your body and evaporate, you lose heat and will feel cold
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| on a hot day why is the outside of the glass wet | condensation is occuring, the cold glass hits the hot air that contains water vapor, it release the heat energy and forms a liquid on the glass
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| how is an insect walking on the water | the surface tension caused my cohesion of water molecules so the light bug cannot break the surface tension and will float on water
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| why do paper towels absorb water | capillary action is when the water molecules adhesion to the paper molecules and a combined force of action occurs
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| WHAT IS THE ONLY SUBSTANCE ON EARTH THAT COMMONLY EXISTS IN ALL OF ITS DIFFERENT STATES | WATER
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| solid | molecules packed tightly, vibrate slowly, definite shape, has volume
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| liquid | molecules flow freely over and around each other, definite volume, no definite shape
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| gas | atoms in an excited state, move and vibrate rapidly, no definite shape, no definite volume
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| five states of matter | solid, liquid, gas, plasma, bose-einstein condensates
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| plasma | super excited hot atoms
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| bose-einstein condesnates | super cold atoms, clumping
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| each state is known as a | phase
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| a phase describes | a definite state of matter
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| how can things change from one phase to another | by physical means
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| what energy cause physical change | temperature and pressure
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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