Measuring Matter: Use pages 446-451 to answer the questions below:
1. Why does your mass stay the same, but your weight changes on the Moon or on
another planet? What is the definition of mass? What is the definition of weight?
What is the SI unit of mass? What is the SI unit of weight?
Gravity is the pull of gravity on your mass. gravity can change throughout the
universe but not our mass. Mass is the number and types of atoms an object has.
Weight is the pull of gravity on an objects mass. kg N
2. What is volume? What is the volume of a block of wood with length = 3 cm,
width = 2 cm, and height = 2 cm? How do you measure the volume of an irregular
object like a rock?
Volume is the amount of space an object takes up (3 dimensions); 12 cm3; water
displacement method (remember the King’s crown);
3. What is density? What is the formula for density? What is the density of water?
What is a simple way to test the relative densities of a rock and a block of wood?
Which is less dense, oil or water? How could you demonstrate this?
Density is a given amount of mass in a given amount of volume; D = M/V;
1 g/ml; float the wood and sink the rock, the density of the wood is less than
the rock; oil; mix them together see which floats
4. What is the density of a rectangular block of length = 2 cm, width = 2 cm,
height = 1 cm, and mass 200 grams? Show your work.
D = 200 g/ 4 cm3 = 50 g/cm3;
5. If you took a cup of water out of a swimming pool, would the density of the in the
cup be the same or different as in the swimming pool? Explain. Is size a
characteristic property?
same; Density is a characteristic property so the water in the cup and the water in the
pool would have the same density; Size is not a characteristic property
6. Using the chart on pages 440 name two characteristic properties of each listed
substance. Is the density of water a characteristic property?
water mp = 0 deg bp = 100 deg
chloroform mp = -64 deg bp = 61 deg
ethanol mp = -117 deg bp = 79 deg
propane mp = -190 deg bp = -42 deg
salt mp = 801 deg bp = 1,465 deg
yes, the density of water is a characteristic property