Class Blog 9-16-13

- Turned in Beverage Density Lab

- Picked up new handouts 

- Got back the Unit 1 Exams and went over problems

Remember

• importance of Conservation of Mass
• when calculating data, never use a trial or sample which can drastically change the total density or amount if the other amounts are consistent.

Metal, Nonmetal, Metalloid Lab

Divided into groups

Purpose:
The purpose of this experiment is to investigate the physical and chemical properties of 8 elements and to classify the elements as metals, nonmetal, or metalloids.

Pre Lab Questions:

1. What could happen if hydrochloric acid contacts the skin? How can you protect against this hazard?

-It could burn! Be careful and wash hands when done

2. Using a periodic table, determine the chemical symbol for each of the eight elements to be tested. Write the chemical symbol for each element next to its name in the data table.

Lab Hints: 

1)If it flattens it is malleable

If it crushes into powder it is not malleable

2)Turn on conductivity testers before you use them

3) Use chart on the back of the conductivity tester to determine degree of conductivity

4) Do NOT use excessive force with the hammers

5) Dump solid wastes into garbage can before rinsing it in the sink

6) Please wear safety goggles at all times

7) Wash hands before you leave

8) Eliminate waste in the waste container

What to include in the lab write up (turned in via google drive)

• title
• purpose
• data tables
• post lab questions- write complete sentences!

Consider the following:

Metals are elements that have a luster, are malleable, and conduct electricity.

Many metals react with acids and CuCl2 solution.

Nonmetals are usually dull in appearance, brittle, and do not conduct electricity.

Most nonmetals do not react with acids and CuCl2 solution.

Elements that have at least 2 properties of both are considered metalloids.

Data Table A: Physical Properties

Element
	Luster	Malleability	Conductivity
Aluminum (Al)	shiny	malleable	X
Carbon (C)	dull	not malleable
Silicon (Si)	shiny	not malleable
Tin (Sn)	shiny	malleable	X
Sulfur (S)	dull	not malleable
Magnesium (Mg)	shiny	malleable
Zinc (Zn)	dull	not malleable	X
Iron (Fe)	shiny	malleable	X

Data Table B: Chemical Properties

Element
	Reaction with HCl	Reaction with CuCl2
Alumimum (Al)		X
Carbon (C)
Iron (Fe)		X
Magnesium (Mg)	X	X
Silicon (Si)
Sulfur (S)
Tin (Sn)
Zinc (Zn)	X	X
		X

Post Lab Questions: 
1. Which elements displayed properties of metals? Give evidence to support your statement.

2. Which elements displayed properties of nonmetals? Give evidence to support your statement.

3. Which elements displayed properties of metalloids? Give evidence to support your answer.

4. Where do you find all the metals on the periodic table? Where do you find all the metals on the periodic table? Where do you find all the nonmetals? Where do you find all the metalloids?

5. Predict the general properties of the following elements: selenium, calcium, and cobalt.

Homework: 4 Webassigns due Thursday night at 11:59 P.M.

                   Do lab write up on google drive (should already be shared with Ms. Friedmann)

Next Scribe.... Dana Sim!