Activity #5

1. Run the Build an Atom simulation http://phet.colorado.edu/en/simulation/build-an-atom and build a neutral lithium atom and a neutral boron atom.  Take a picture, or a screen shot, of these two atoms and place them on your blog.  List the number of protons, neutrons and electrons for each. Also look up and post the density for each of the elements on your blog.

Lithium:3 Protons, 3 Neutrons, Density - 0.53 g/cm3

Boron:5 Protons, 6 Neutrons, Density - 2.34 g/cm3

2. Define density and the equation for density and post on your blog.

Density is defined as its mass per unit volume. Density = Mass / Volume  (p=m/V)

3. Run the Density simulation http://phet.colorado.edu/en/simulation/density and complete one(your choice) of the prepared Teaching Ideas and post your results on your blog. The activity you choose should be one of the student intended activities.

Density Worksheet

Name:________

1. Using the Density Simulation write down which materials you think will float and which will sink.

A. Float; Styrofoam, Wood, Ice Sink; Aluminium, Brick

2. Now using the Density Simulation again write down the Mass, Volume, and Density of the Materials. Then state whether the material floated.

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Styrofoam	0.75	5.00	0.15	yes
Wood	2.00	5.00	0.40	yes
Ice	4.60	5.00	0.92	yes
Brick	10.00	5.00	2.00	no
Aluminum	13.50	5.00	2.70	no

Based on your initial guess were you right or wrong on whether the object would float or not? Why do you think the wood, ice and styrofoam floated and the brick and aluminum did not?

4. Complete the Mystery Blocks activity on the Density simulation.  Post on your blog the data you collected

(mass, volume, and density) and the identification of the material and the known density

Block A:
Mass = 65.14 kg
Volume = 3.38 L
Density = m/V = 19.27 kg/L


Block B
Mass = 0.64 kg
Volume = 1.00 L
Density = m/V = 0.64 kg/L


Block C
Mass = 4.08 kg
Volume = 5.83 L
Density = m/V = 0.69 kg/L


Block D
Mass = 3.10 kg
Volume = 3.38 L
Density = m/V = 0.92 kg/L


Block E
Mass = 3.53 kg
Volume = 1.00 L
Density = m/V = 3.53 kg/L

5. Identify and post on your blog the Science Standards that could be met through these activities completed in Activity 5

A.4.1 When conducting science investigations, ask and answer questions that will help decide the general areas of science being addressed
A.4.2 When faced with a science-related problem, decide what evidence, models, or explanations previously studied can be used to better understand what is happening now
B.4.1 Use encyclopedias, source books, texts, computers, teachers, parents, other adults, journals, popular press, and various other sources, to help answer science-related questions and plan investigations
C.4.2 Use the science content being learned to ask questions, plan investigations, make observations, make predictions, and offer explanations
D.4.5 Construct simple models of what is happening to materials and substances undergoing change, using simple instruments or tools to aid observations and collect data