Properties of Matter

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Properties of Matter
Anything in red type or on a red slide, you do
not need to put into your notes. Everything else,
you are expected to put into your notes.
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Pre-Assessment Questions

• What is matter?
• Can you give an example of matter?
• Are mass and volume the same thing?
• What is density?

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• Matter anything that takes up space and has mass

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Which of these are matter?

• You
• Table
• Dog
• Pop

• Water
• Air
• Carbon dioxide
• Light

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• Everything in the universe is either MATTER or
  ENERGY.

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Matter has physical properties.

• Physical properties characteristics that can be
  used to identify and describe materials. Any
  property that can be observed or measured is a
  physical property.
• Examples include color, shape, brittleness,
  density, length, width, height, mass, and volume.

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Science uses the metric system to measure.
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Measuring Mass

• Mass is the amount of matter (number of atoms) in
  an object.
• Mass does NOT change unless you add or subtract
  matter.
• In this demonstration, how could I change the
  mass of the water?

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• We measure mass with a balance scale.
• Steps in using a triple-beam balance
• Carry the scale carefully using both hands.
  (They cost about 100 each, so please treat them
  nicely.)

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• Zero the scale - first move all the masses to
  the zero position, see if the line is at zero.
  If not, gently turn the knob at the end and allow
  it to balance. Repeat until the line is at zero.

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• Put the object on the pan.
• Move the masses until the lines are lined up.
• Record the total mass.

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Practice using the triple beam balance scales.

• Get a partner and one scale for both of you to
  use.
• Zero the scale.
• Take turns measure the masses of objects such as
  a pen or pencil, a planner, a ruler, a glue
  stick, or other reasonably small object.
• When you are both confident in using the scale,
  call your teacher over to test you.

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• Mass is measured in grams.
• 1000 grams ____ kilogram
• 1 gram ____ milligrams

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Measuring Volume

• Volume is the amount of space an object occupies.
• Solids and liquids have a definite volume that
  means you cant change it without adding or
  subtracting matter.

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• Gases can compress or expand to the size of their
  container, so their volume can change its NOT
  definite.
• Watch the demonstration. Which type of matter
  can be squeezed into a smaller space?

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We measure the volume of liquids with a graduated
cylinder.

• Graduated cylinders are made of glass and will
  break if dropped. Please be careful with them!!

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• Steps in using a graduated cylinder
• Put the liquid in it.
• Place it on a flat surface.

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• Get down to read it at eye level.
• Read it at the bottom of the smile (meniscus).

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Practice using the graduated cylinder

• With a partner, get a graduated cylinder.
• Try to get exactly 50 ml of water in it.
• Have your partner check you.
• Repeat for different amounts until both of you
  are confident in using it.
• Call your teacher over to quiz you.

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• Volume is measured in liters.
• 1000 liters ____ kiloliter
• 1 liter ____ milliliters

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We measure volume of a regular solid by using
math.

• To find the volume of a box you multiply length
  times width times height.
• V l x w x h

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Example

• A box has a length of 10 cm, a width of 5 cm and
  a height of 2 cm. Find volume.
• V l x w x h
• V 10 cm x 5 cm x 2 cm
• V 100 cm3
• cm times cm times cm cm3

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Time to try finding volume in a mini lab!

• Get a partner and find the volume of at least 2
  of the boxes in lab.
• Write down each measurement and your final answer.

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The Box Volume Lab

• Get the lab sheet and follow the instructions
  carefully!
• Link to the lab sheet!

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We find volume of an irregular solid using the
submersion method

• An example of an irregular solid is a rock.
• To find its volume
• Put water into a container such as a graduated
  cylinder.
• Note how much water there is.
• Put the object in and the water rises.
• Note how much the water rose and thats the
  volume.

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Why does this work?

• Since volume is the amount of space an object
  takes up, when you put an object in water it
  displaces the water. This means that the water
  still takes up the same amount of space for
  itself plus the amount of the object, so the
  water rises the amount of the volume of the
  object.

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Time for you to try in lab.

• With a partner find the volume of one or two of
  the irregular objects.
• Call your teacher over when you are confident you
  know what you are doing.

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• Which weighs more a pound of feathers or a
  pound of lead?
• Actually, they weigh the same. But which takes
  up more space?

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Density

• Density is a measure of how closely packed the
  atoms are in a substance.
• density mass divided by volume
• d m/v

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An example

• An object has a mass of 30 grams and a volume of
  6 milliliters. What is its density?
• m 30 g v 6 ml
• dm/v d 30g/6ml
• d5 g/ml

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You try a couple density problems!

• mass100 grams, volume20 ml
• mass7 grams, volume14 ml
• mass40 grams, volume5 ml

• Answers
• 5 g/ml
• .5 g/ml
• 8 g/ml

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Time for a lab!Density Lab 1

• Get a partner.
• Open a new spreadsheet and write down the
  question.
• Question How do you think we could find out the
  density of water?

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• Next do background research, and a hypothesis.
• Then we will discuss your ideas about how to do
  this lab.
• And then everyone can do the lab after we agree
  on the experimental procedure.

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Density Quiz

• What is the equation for density?
• I have two cube shaped objects that have
  identical volumes. Cube A has a mass of 100 grams
  and cube B has a mass of 70 grams. Which cube has
  a higher density?
• A box has a mass of 20 grams and a volume of 5
  cm3. What is its density with units?

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• A sample of liquid has a volume of 7 ml and a
  mass of 35 grams. What is its density?
• I have a liquid of unknown density. What two
  pieces of lab equipment would I use to find
  density?
• I have a box of unknown density. What two pieces
  of lab equipment would I use to find density?
• I have an oddly shaped rock of unknown density.
  What two pieces of lab equipment would I use to
  find density?

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Quiz Answers

• dm/v
• Cube A
• 4 g/cm3
• 5 g/ml
• Graduated cylinder and balance scale
• Ruler and balance scale
• Graduated cylinder and balance scale (and maybe a
  beaker)

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Density Lab 2

• Open a new spreadsheet and type in the problem
  Rank the five objects in order of increasing
  density.
• For background research give the definitions for
  mass, volume, and density and the equation for
  density

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• For your hypothesis pick up and look at each of
  the objects and make your best educated guess in
  ranking them from lowest to highest density.
• Next, decide how you will find out if your
  hypothesis is correct and write down the steps of
  your experimental procedure.

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• Make a data table in the spreadsheet for your
  results. The table should have columns for
  object, mass, volume, density, and rank.
• Do the experiment and fill in the results in your
  table.
• For your conclusion list the objects in order of
  increasing density.
• To verify ask another group that used the same
  objects if your results agree with yours.