C. SHORT-ANSWER QUESTIONS: Answer in a sentence or two.
1. When will two elements on being mixed together form a compound?
2. Why are the properties of different compounds so different from each other?
3. Why are most elements not found in the free state in nature?
4. How can you form iron sulphide from a mixture of iron and sulphur?
5. What does a formula represent?
6. Define valency in terms of hydrogen.
Answers
Explanation:
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Answer:
1) When two elements are mixed together, a compound is only formed when they react with each other. If they don't react, no compound is formed.
2)Compounds have different properties from the elements that make them. The atoms of different elements are held together in compounds by chemical bonds. Chemical bonds can hold atoms together in large networks or in small groups. Bonds help determine the properties of a compound
3) elements will try to 'loss or gain electrons' from their outer shells to satisfy the octet rule. Many elements have a great tendency to combine with each other to form compounds. Hence, these elements are, therefore, not found in the free state in nature
4)Iron sulphide can be formed by heating a mixture of iron and Sulphur. It becomes a hard black sloid and does not represent the individual properties of iron and Sulphur individually.
5)Chemical formulas are used to describe the types of atoms and their numbers in an element or compound. The valency when defined in terms of hydrogen is the number of hydrogen atoms that can combine with or replace one atom of the element.
6)The valency when defined in terms of hydrogen is the number of hydrogen atoms that can combine with or replace one atom of the element.