(a)
Interpretation: To identify whether the elements are metal, non-metal or metalloid from sodium to argon in the periodic table.
Concept introduction: The third period of periodic table have elements as follows; sodium, magnesium, aluminium, silicon, phosphorous, sulfur, chlorine and argon.
Metals are the elements which can form positive ions by loosing electrons. Non-metals are the elements which can form negative ions by gaining electrons. Metalloids are elements which shows both properties of metals and non-metals.
(b)
Interpretation: To identify the colour and appearance of third period elements through sodium to argon.
Concept introduction: The colour of element is a physical property of elements. Elements shows colour due to excitation of electrons by absorbing energy.
(c)
Interpretation: To identify the states (solid, liquid and gas) of elements through sodium to argon.
Concept introduction: There are three types of
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Chemistry & Chemical Reactivity
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- Based on the information shown in the attached image, which of the following statements are CORRECT? (I) Hydrogen is the best reducing agent in acid solution. (II) Hydrogen is the best reducing agent in basic solution. (III) Oxygen is the best oxidizing agent in acid solution. (IV) Oxygen is the best oxidizing agent in basic solution.arrow_forward(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In a redox reaction, the oxidation number of iron changed from +2 to +3; thus, sulfur is a reducing agent. In a redox reaction, the oxidation number of nitrogen was unchanged; thus, nitrogen is an oxidant. 2. In a redox reaction, the reducing agent is oxidized and it gains electrons. In a redox reaction, the oxidizing agent is reduced and it gains electrons. 3. Bending stress is also known as flexural stress. The test used in observing the mechanical strength of chocolate is the three-point bend test. 4. The flexural strength of materials may be expressed in Pascals. Magnesium is more reactive than silver; therefore, magnesium corrodes faster than silver with the aid of air, oxygen, and sea water.arrow_forwardComplete and balance the following acid-base equations:(a) A solution of HClO4 is added to a solution of LiOH.(b) Aqueous H2SO4 reacts with NaOH.(c) Ba(OH)2 reacts with HF gas.arrow_forward
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