In this performance task, you will classify substances according to similar physical properties. In the first part, you will practice this skill by organizing a variety of common items according to characteristics you choose. Then you will write an explanation as to why you placed the objects into the categories. In the second part of this task you will classify physical properties of elements. Part 1: Study the list of items.
Cereal
Saw
Rice
Hammer
Carrot sticks
Measuring tape
Pliers
Sailboat
Train
Bread
Grapefruit
Pickles
Bicycle
Screwdriver
Airplane
Skateboard
Bus
Wrench
Classify the items into three categories according to their similar physical properties. Once you have all the items classified, write a brief paragraph to explain your classification system and why you chose particular items for each category.
Part 2: The table below lists some elements and their physical properties.
Element
Density (g/cm3)
Boiling Point (°C)
Melting Point (°C)
Mercury (Hg)
13.546
357
-39
Gold (Au)
19.32
2807
1064
Silver (Ag)
10.5
2212
962
Hydrogen (H)
0.0899
-253
-259
Boron (B)
2.34
2550
2300
Barium (Ba)
3.59
1140
725
Radium (Ra)
5.5
1737
700
Antimony (Sb)
6.684
1750
700
Platinum (Pt)
21.45
3827
1772
Plutonium (Pu)
19.84
3235
640
Classify these elements into three categories according to their similar physical properties. Once you have all the elements classified, write a brief paragraph to explain your classification system and why you chose particular elements for each category.