Question

1. What is atomic number of Element B?
2. Which element in the table will never participate in a chemical reaction?
3. Name the NON METALLIC element?
4. Which element has 3 orbit and 3 valence electrons?
5. There are _________________ neutrons in the nucleus of ELEMENT B.
6. During a chemical reaction element ________________ will form an anion.
7. During a chemical reaction ELEMENT B will ___________ electron to form an ion and
achieve a noble gas configuration .
8. Name the compound formed between ELEMENT A and ELEMENT B
9. Name the compound formed between ELEMENT B and ELEMENT C
10. What is the atomic number of ELEMENT D.
11. Differentiate between endothermic and exothermic reactions. [2]
12. What are polyatomic ions? Name the different types and give one examples each. [3]
13. Answer briefly [1x3=3]
(a). The gas produced when zinc granules is added to sulphuric acid
(b). Rotten egg smelling gas
(c) The gas that turns limewater milky
14. Write down balanced chemical equation for [1x2=2]
(a) Quicklime is added to water
(b) Few drops of ferrous sulphate is added to sodium hydroxide

Answer 1

Answer:

Solar Eclipse is also known as the eclipse of the sun, it occurs when the moon comes in between the sun and the earth. As a result, the moon blocks the light of the sun from reaching the earth's surface and casts a shadow on it. This occurs on a new moon phase. We can observe up to 5 solar eclipses per year.

Answer 2

Answer:

An acceleration can cause speed to increase, decrease, and even stay the same! Acceleration tells you the rate at which the velocity is changing. ... The acceleration can change the magnitude and/or the direction of the velocity. Speed is only the magnitude of the velocity