ICSE Class 6 Chemistry - Elements, Compounds and Symbols - Test 4 (Expert)
1. A teacher says water is not an element because it can be split into hydrogen and oxygen. What does this show?
A. Water is a metal
B. Water is a mixture of sand
C. Water is a compound
2. A shiny brown wire is made of copper. Which statement is correct?
A. Copper is an element with symbol Cu
B. Copper is a compound with symbol Co
C. Copper is water with symbol W
3. Sodium and chlorine chemically combine to form common salt. Common salt is a:
A. Single element
B. Compound
C. Physical mixture only
4. Which one is a chemical symbol, not a formula?
A. H2O
B. NaCl
C. H
5. The formula CO2 represents:
A. Carbon dioxide
B. Copper only
C. Calcium only
6. Which formula represents water?
A. CO2
B. H2O
C. NaCl
7. Which formula represents common salt?
A. H2O
B. CO2
C. NaCl
8. A student writes the symbol of oxygen as o. What is the correct form?
A. O
B. Ox
C. OG
9. Which symbol is written correctly according to chemical symbol rules?
A. aL
B. Al
C. AL
10. Which pair correctly shows an element and its compound?
A. Water and water
B. Salt and salt
C. Carbon and carbon dioxide
11. A rod is made of pure iron. Which symbol is used for the element in the rod?
A. Fe
B. F
C. Ir
12. Why is the symbol Na used instead of writing sodium every time?
A. To change sodium into water
B. To write sodium in short form
C. To show sodium is a mixture
13. Two elements combine chemically and form a new substance with new properties. The new substance is called:
A. A shadow
B. An element only
C. A compound
14. Why are C and Ca different symbols?
A. They represent different elements
B. They both mean calcium
C. They both mean carbon
15. Which statement is true about a compound?
A. It is made by random physical mixing only
B. It has a fixed composition
C. It must always be a metal
16. Which symbol should be used for nitrogen in a simple chart?
A. Na
B. Ni
C. N
17. A jewellery label shows Au. Which element does the label refer to?
A. Gold
B. Aluminium
C. Silver
18. Which symbol should be written for silver?
A. Au
B. Ag
C. Al
19. What information does the formula H2O give at Class 6 level?
A. Water contains iron and gold
B. Water is only oxygen
C. Water contains hydrogen and oxygen
20. Which comparison is correct?
A. Element: one kind of atom; Compound: elements chemically combined
B. Element: always a mixture; Compound: always one atom only
C. Element: no matter; Compound: no elements