Activity #5

Lithium

Protons:3

Neutrons:4

Electrons:3

Density: 0.53 g/cm3

BoronProtons:5

Neutrons:6

Electrons:5

Density: 2.34 g/cm3

Density: The state or quality of being dense; compactness; closely set or crowded condition. http://dictionary.reference.com/browse/density

Density Formula: Density = Mass/Volume OR  D=M/V

3. Floating and Sinking:
Pre Lab Questions:

You have a block, and you see that it floats in water.

What could it be made of?

Ice, Styrofoam, Wood, Plastic

What do you think will happen if you make a bigger block out of the same material?  Will it float or sink?

I think it will still float

You have another block that sinks.

What could it be made of?

Rock, cement, glass, metal

What do you think will happen if you make a smaller block out of the same material?  Will it float or sink?

I think it will still sink.                      

Why do you think Block #1 floats and Block #2 sinks?

I think Block #1 floats and Block #2 sinks because they are less dense.

4. 

Block A:

Mass: 65.14 kg

Density: .63 kg/L

Volume: 103.38 L

Block B:

Mass:.64 kg

Density: 100.64 kg/L

Volume: .00063 L

Block C:

Mass:4.08 kg

Density: 104.08 kg/L

Volume:.039 L

Block D: 

Mass: 3.10 kg

Density: 103.10 kg/L

Volume:.03 L

Block E: 

Mass: 3.53 kg

Density: 101.00 kg/L

Volume: .0349 L

Science Standards Met

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.4.5 Use data they have collected to develop explanations and answer questions generated by investigations

D.4.1 Understand that objects are made of more than one substance, by observing, describing and measuring the properties of earth materials, including properties of size, weight, shape, color, temperature, and the ability to react with other substances

D.4.2 Group and/or classify objects and substances based on the properties of earth materials