<< Chapter < Page Chapter >> Page >

Natural sciences

Grade 8

Matter: classification

Module 19

Elements and compounds

Elements

  • One of the basic sets of information in the natural sciences is represented in the list of elements.
  • We refer to it as the Periodic Table.
  • There are 112 elements in this table, and 90 of them occur naturally on our planet and as far as we know in the surrounding space.
  • The rest are manufactured synthetically in laboratories.
  • The elements are arranged according to qualities like mass and density, and according to how they are chemically compounded.

Assignment

  • Collect information on Mendeleev (1834-1907) ) and on how he devised the periodic table.
  • Add this to your poster about scientists through the ages.

http://smallfry.dmu.ac.uk/chem/tables

Class activity: listening skills

Listen attentively to the educator’s explanation and complete the following.

The Periodic Table

1. The horizontal lines are known as

2. The vertical lines are known as

3. In what part of the periodic table do we find the metals?

4. Which metals are stored under paraffin? Why?

5. What do we call these metals?

6. In what part of the periodic table do we find the non-metals?

7. Which non-metal is stored under water? Why?

8. Where do we find most of the gases? Explain this

9. Which gases do not react with other substances?

10. What is the name of this group of gases?

11. Name the lightest gas

12. Which elements occur in liquid phase at room temperature?

13. Which element sublimates?

14. In which phase do most elements occur at room temperature?

15. Why do we place particular elements in the same group?

Elements and their Symbols

  • Transfer the names of the elements and their symbols to the periodic table on the following page.
  • Apply colour to indicate the different groups.]LO 2.2]

Assessment of listening skills

Test yourself: are you able to answer questions 1 – 15 without referring to the answers?

[LO 2.1]

Group work: quiz

Any question that cannot be answered must be investigated.

Which element do we have here ?

[LO 2.1]

 Do you know the following? 

Some elements, like

CARBON

occur in various forms:

diamonds

coal, and the

graphite in your pencil!

http://education.jlab.org/itselemental/ele006

http://mineral.galleries.com

Assessment

Learning outcome 2: Constructing science knowledge

The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

We know this when the learner

2.1 is able to recall significant information;

2.2 is able to categorise information.

Memorandum

1. periods

2. groups

3. below left and in the transition block

4. Li, Na, K – reactive with water vapour

5. Alkali metals

6. Below right

7. P – reactive with oxygen

8. On the extreme right

9. Gases on extreme right

10. Noble gases

11. H

12. Br and Hg

13. Iodine

14. Solid substance

15. Corresponding qualities

The PERIODIC TABLE OF ELEMENTS

1. periods

2. groups

3. below left and in the transition block

4. Li, Na, K – reactive with water vapour

5. Alkali metals

6. Below right

7. P – reactive with oxygen

8. On the extreme right

9. Gases on extreme right

10. Noble gases

11. H

12. Br and Hg

13. Iodine

14. Solid substance

15. Corresponding qualities

ELEMENTS AS SYMBOLS

GROUP WORK:QUIZ

1. Mg

2. Titanium

3. Fe

4. He

5. Cu

6. H

7. Ag

8. S

9. Br

10. Ar

11. Co

12. Ca

13. P

14. Si

16. Cl

17. K

18. Cr

19. Ne

20. Cyanide

21. Al

22. N

23. Kr

24. Na

25. Zinc

CLASS ACTIVITY: RECOGNITION OF METALS AND NON-METALS

Metals:

Non-metals:

1. shiny, hard

2. gold

3. demand

4. study of metals

5. alloy

6.

7. Pliable – long threads stretched out.

Malleable – hammered into thin plates/sheets.

GROUP WORK: QUIZ

1. Mg

2. Titanium

3. Fe

4. He

5. Cu

6. H

7. Ag

8. S

9. Br

10. Ar

11. Co

12. Ca

13. P

14. Si

16. Cl

17. K

18. Cr

19. Ne

20. Cyanide

21. Al

22. N

23. Kr

24. Na

25. Zinc

GoldAuVM

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natural sciences grade 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11050/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natural sciences grade 8' conversation and receive update notifications?

Ask