classifying Materials

1. Why do isotopes of the same element have the same chemical properties?

• A.     They have the same mass number.

• B.     They have the same number of protons and electrons.

• C.     They have different numbers of neutrons.

• D.  They are all radioactive.

2. Which of the following is NOT a common application of isotopes?**

• A.     Radiometric dating

• B.     Changing one element into another

• C.     Medical imaging and cancer treatment

• D.     Tracers in biochemical reactions

3. . Is it possible to write the electronic configuration of an atom if its atomic number is known?

• A.     No, because the mass number is also needed.

     

• B. Yes, because the atomic number tells you the number of electrons.

• C.     No, because isotopes have different configurations.

• D.     Yes, but only for elements in Period 4 or higher.

4. 4. What is the correct electronic configuration for Chlorine (Atomic Number 17)?

• 2,8,6,

• 2,8,17

• 2,8,7

• 2,8,1

6. 6. How many total oxygen atoms are in one formula unit of Ca₃(PO₄)₂

• 4

• 6

• 8

• 12

7. In the compound FeSO₄, what is the valence of the Fe ion?

• a) +2

    

• b) +1

• c) +3

•    d) +4

8. Which element contains the highest number of neutrons?

(a)  

10. Which of the following is the balanced equation for:

11. Sodium + Sulphuric acid → Sodium sulphate + Hydrogen

• a) Na + H₂SO₄ → NaSO₄ + H₂

•   b) 2Na + H₂SO₄ → Na₂SO₄ + H₂

     

• c) Na + H₂SO₄ → Na₂SO₄ + H₂

•     d) 2Na + 2H₂SO₄ → 2Na₂SO₄ + H₂

. In which group and period does element E belong?

   

(a)  

Which of the following is the balanced equation for: Copper carbonate + Sulfuric acid → Copper sulphate + Carbon dioxide + Water

• a) CuCO₃ + H₂SO₄ → CuSO₄ + CO₂ + H₂O

   

•    b) CuCO₃ + 2H₂SO₄ → CuSO₄ + 2CO₂ + 2H₂O

     

• c) 2CuCO₃ + H₂SO₄ → 2CuSO₄ + CO₂ + H₂O

     

• d) CuCO₃ + H₂SO₄ → CuSO₄ + 2CO₂ + H₂O