Chemistry G7 1st Semester

Answer this questions !
1. What are the element names of the following symbol?
H O N P Fe Au
2. Write the symbols of the following elements !
Sodium, hydrogen, oxygen, iron, copper
3. Explain the differences between elements and compounds!

4. Among the following sentences, state which ones are mixtures and mention the forming elements.
a. Air c. Gold e. Pure water
b. Seawater d. Sugar f. Brass
5. What is meant by compounds ? Mention 5 examples of compounds around you.
6. Write down the chemistry formula of the following compounds :
Carbon monoxide, carbon dioxide, water, glucose, alcohol, methane, ozone !
7. Among the following sentences, state which ones are mixtures and mention the forming elements.
a) Air c. Gold e. Pure water
b) Seawater d. Sugar f. Brass
8. What do you know about homogenous mixture ? Give 2 examples !
9. What do you know about hoterogenous mixture ? Give 2 examples !
10. Explain the differences between compounds and mixtures!
11. Among the following sentences, state which ones are mixtures and mention the forming elements.
a. Air c. Gold e. Pure water
b. Seawater d. Sugar f. Brass
12. Explain what do know about stainless steel ? Mention
13. Explain what do you know about distillation ?
14. Explain what do you know about distillation ?
15 What is the advantages of mixture separation ?
16 The proper method to separate mixture based on the difference of boiling point of supstances
is called ….
a) evaporation
b) filtering
c) distillation
d) chromatographing
17. The easy method to separate mixture based on the capability to sublime is ….
a) evaporation
b) sublimation
c) distillation
d) chromatographing
18. Take a bar of chalk. Make list of physical properties of chalk :
• Color
• Shape
• Hardness
• Length
• Diameter

19. Mention the physical properties of vinegar / acetic acid !
20. Mention the physical properties of baking soda !
21. Mention the physical properties of gasoline!
22. Are the following concepts physical or chemical properties
• Taste
• Flammables
• Color
• Smell
• Soluble
• Breakable

22. Determine whether the following changes are physical or chemical changes
• Bended copper wire
• Food digestion
• Vaporized gasoline
• Fermented cassava
• Rotten rice
• Porridge
• Rusted iron

23. What are the differences among acid, base, and salt characteristic? Explain and 3 examples each part!