Question

1. Write the molecular formula of the following compounds:
a) carbon carbide.
b) Sodium chloride.
c) Magnesium chloride.
d) Iron (II) Sulphate.
e) Copper (II) Hydroxide.
2. Solve the problems:
a) A gas occupies a volume of 300 cmcube of Hydrogen find under what pressure occupies a volume of 380 cmcube. The temperature during a reaction remains constant.
b) State the value of STP.
3. a)Name the elements present in group 1 and period 3.
b) Group 2 and period 2.
c) Group 14 and period 2.

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Answer 1

Answer:

1.(a) CaC2

(b) NaCl

(c) Mgcl2

(d) FeO4S

(e) cu(OH)2

3.(a) Sodium, (Na)

(b) Beryllium (be)

(c) silicon (si)

Answer 2

Answer:

1) a) Co2

b) NaCl

c) MgCl2

d) FeS

e) Cu(OH)2

2. a) Sorry, but I don't know

b) Value of STP is

The temperature of 273.15 K ( 0° C, 32 ° F)

The pressure of exactly 10'5 Pa ( 100 kPa, bar 1)

3. A) Group 1 and Period 3 Sodium, Magnesium, Aluminum, Silicon, Phosphorous, Sulfur, Chlorine, and argon.

B) Group 2 and Period 2: Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine and neon.

C) Group 14 and Period 2: Six Elements Carbon, Silicon, Germanium, Tin, Lead, and Flerovium.