GCSE Edexcel Chemistry Group 7 – Halogens: Complete the following sentences

Question

Complete the following sentences.

(i) The name given to group 7 in the periodic table is ______________.

(ii) The name given to group 0 in the periodic table is ______________.

(b) Which of the following rows gives the colours of the group 7 elements chlorine and bromine at room temperature?

| Chlorine       | Bromine      |  
|----------------|--------------|  
| A  red-brown   | purple       |  
| B  yellow-green| grey         |  
| C  yellow-green| red-brown    |  
| D  grey        | red-brown    |

(c) Figure 2 shows the melting and boiling points of bromine and iodine.

| element        | melting point in °C | boiling point in °C |  
|----------------|---------------------|---------------------|  
| bromine       | -7                  | 59                  |  
| iodine        | 114                 | 184                 |

Using the information in Figure 2, which row shows the physical states of these elements at 50°C?

| bromine       | iodine       |  
|---------------|--------------|  
| A  liquid     | gas          |  
| B  solid      | liquid       |  
| C  gas        | solid        |  
| D  liquid     | solid        |

(d) The densities of some elements in group 0 are shown in Figure 3.

| name          | density in gm³ |  
|---------------|----------------|  
| helium        | 0.15           |  
| neon          | 1.2            |  
| argon         | 1.4            |  
| krypton       | ?              |  
| xenon         | 3.5            |

Use the information in Figure 3 to suggest the density of krypton.

density of krypton = ______________ gm³.

(e) For many years, argon was used to fill filament light bulbs. A filament light bulb is shown in Figure 4.

When the bulb is in use, the metal filament becomes extremely hot.

Explain why argon, rather than air, was used to fill light bulbs.

Complete the following sentences - Edexcel - GCSE Chemistry - Question 2 - 2019 - Paper 1

Worked Solution & Example Answer:Complete the following sentences - Edexcel - GCSE Chemistry - Question 2 - 2019 - Paper 1

Complete the following sentences. (i) The name given to group 7 in the periodic table is

(ii) The name given to group 0 in the periodic table is

Which of the following rows gives the colours of the group 7 elements chlorine and bromine at room temperature?

Using the information in Figure 2, which row shows the physical states of these elements at 50°C?

Use the information in Figure 3 to suggest the density of krypton.

Explain why argon, rather than air, was used to fill light bulbs.

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