Question 1

1. transition metals

2. 4

3. atoms of an element with the same number of protons but different number of neutrons int he nucleus

4. n = 36

   e = 29

5. alloy

6. has high melting point, resists corrosion and is hard, malleable and ductile. this measn that it is easy to sculpt and is durable and strong for a long time

Question 2

1. Oxidation

2. A

3. 4, 3, 2

4. Fe = 56

   n = 0.6/56

   n = 0.011

   ratio = 4:3

   n = 0.00825 mol

5. chlorine, iron, iron chloride

6. 2, 8, 7

7. ionic bonding,

8. Fe loses its valance electrons and Cl gains electrons to complete its outer shell. it forms an ionic bonding because of the electrostatic attraction between oppositely charged ions.

Question 3

1. (3.14+2.79+2.87) / 3 = 2.93
2. pH probe because it gives an exact number to 2 decimal places which increases accuracy. probe gives quantitative data whereas indicator gives qualitative data
3. lemon juice because it had the greatest increase in pH