science

2. Review

4. To differentiate
compounds from
elements

6. Classify the following as elements, or compounds.
1. Hydrogen (H)
2. Calcium (Ca)
3. Glucose (C6H12O6)
4. Sodium hydroxide (NaOH)
5. Helium (He)
6. Carbon dioxide (CO2)
7. Water (H2O)
8. Manganese (Mn)
9. Potassium (K)
10. Nickel (Ni)

9. Pure Substances
Are substances that are made up of only one kind
of particles and has a fixed or constant structure

10. Element
•Elements are simple substances that have unique
compositions.

11. Dmitri Mendeleev

12. Video

14. Example of an Element

17. Metals
•High Density and hard
•Ductile and malleable
•Have high melting points
•Good conductor of heat and electricity
•Lustrous

19. Non-Metals
•Low Density
•Brittle
•Have low melting points
•Poor conductor of heat and
electricity

21. Metalloids
•May conduct heat and electricity at
varying points
•Have varied density and melting
points
•Some are shiny.

22. •Your Turn

23. Identify each element as a metal, non-metal or metalloid.
1. Copper (Cu)
2. Oxygen (O)
3. Silicon (Si)
4. Boron (B)
5. Potassium (K)
6. Helium (He)
7. Iron (Fe)
8. Hydrogen (H)
9. Calcium (Ca)
10. Antimony (Sb)

24. Identify each element as a metal, non-metal or metalloid.
1. Copper (Cu) - Metal
2. Oxygen (O) - Nonmetal
3. Silicon (Si) - Metalloid
4. Boron (B) - Metalloid
5. Potassium (K) - Metal
6. Helium (He) - Nonmetal
7. Iron (Fe) - Metal
8. Hydrogen (H) - Nonmetal
9. Calcium (Ca) - Metal
10. Antimony (Sb)- Metalloid

25. Compound
•A compound is formed by
combining two or more different
elements that are chemically
combined.

26. 2 Types of Compounds
1. Organic Compounds are a large class of chemical
compounds wherein carbon atoms are covalently
(chemical bonds formed by the sharing of electrons)
linked to atoms of other elements such as oxygen,
nitrogen, and hydrogen.
2. Inorganic Compounds deal with those that are not
predominantly carbon-based.

28. Elements Compounds
1. It is a simplified form of
matter which cannot be
decomposed by ordinary
chemical means.
2. Example: Oxygen and
Hydrogen
1. A compound is formed by
combining two or more
different elements that are
chemically combined.
2. Example: Water

29. Classify the following as elements, or compounds.
1. Hydrogen (H)
2. Calcium (Ca)
3. Glucose (C6H12O6)
4. Sodium hydroxide (NaOH)
5. Helium (He)
6. Carbon dioxide (CO2)
7. Water (H2O)
8. Manganese (Mn)
9. Potassium (K)
10. Nickel (Ni)

30. Essential Elements and Compounds
• Potassium- is very important mineral to the human body. It has
various roles in metabolism and body functions.
• Sodium- It controls the ability of your body to regulate water.
• Iron- It is essential for oxygen transport and energy capture.
• Calcium phosphate- It gives bones their strength, structure and
density.

31. Valuing:
• Keeping healthy is important. Therefore, we must eat a well-
balanced diet. Water is a compound that makes up more than half of
our body weight, so we need to take in lots of water (around 2-3 litres
a day), especially on hot days. Other compounds we need are starch
for energy, proteins for growth, and elements like magnesium, iron,
iodine, and others for certain body functions. There are also other
compounds we need to regulate like sugar, cholesterol and fats.
Taking in too much of these can eventually lead to poor health. Let us
eat well and be well.