Predicting Chemical Reactions
1. This question has 5 part(s).
1.1. This question is about the properties of elements in Groups 1, 7 and 0.
Lithium, sodium and potassium are all Group 1 elements.
A teacher adds a small piece of potassium to a trough of water, as shown in the diagram.
The potassium fizzes and a gas is produced.
Describe what else you would observe.
1.2. Reactivity increases going down Group 1 from lithium to potassium.
Explain this trend in reactivity.
Use ideas about the electronic configurations of the atoms in your answer.
1.3. Look at the table. It shows information about the Group 7 elements.
Complete the table.
Element | Formula | Colour | State at room temperature |
Fluorine | F2 | pale yellow | gas |
Chlorine | C2 | ......................... | ......................... |
Bromine | Br2 | brown | liquid |
Iodine | I2 | grey | ......................... |
1.4. The Group 7 elements exist as simple molecules.
Fluorine boils at −188°C.
Explain why fluorine has a low boiling point.
1.5. The elements in Group 0 (the noble gases) are unreactive.
Explain why, in terms of their electronic configurations.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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