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Answers
Answer:
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Explanation:
(1)The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number. For example, carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13, and 14, respectively.
(2)(i) Isotopes of an element have same atomic masses. (ii) Isotopes of an element have same atomic number. (iii) Isotopes of an element show same physical properties. (iv) Isotopes of an element show same chemical properties.
(a)Hg(NO3)2 → Hg + 2 NO2 + O2
This is an oxidation-reduction (redox) reaction:
2 NV + 2 e- → 2 NIV
(reduction)
HgII + 2 e- → Hg0
(reduction)
2 O-II - 4 e- → 2 O0
(oxidation)
Hg(NO3)2 is an oxidizing agent, Hg(NO3)2 is an oxidizing agent, Hg(NO3)2 is a reducing agent.
Reactants:
Hg(NO3)2
Names: Mercuric nitrate source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Mercury (II) nitrate source: ICSC, accessed: 2019-09-04, Mercury dinitrate source: ICSC, accessed: 2019-09-04
Appearance: Colourless crystals or white hygroscopic powder source: ICSC, accessed: 2019-09-04
Products:
Hg
Names: Mercury source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, Hg source: wikidata, accessed: 2019-09-07, Quicksilver source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04
Appearance: Odourless heavy mobile silvery liquid metal source: ICSC, accessed: 2019-09-04
NO2 – Nitrogen dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
Other names: Nitrogen(IV) oxide source: wikipedia, accessed: 2019-09-27, Deutoxide of nitrogen source: wikipedia, accessed: 2019-09-27, Nitrogen peroxide source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
Appearance: Brown gas source: wikipedia, accessed: 2019-09-27; Reddish-brown gas or brown or yellow liquid with pungent odour source: ICSC, accessed: 2019-09-04; Yellowish-brown liquid or reddish-brown gas (above 70°F) with a pungent, acrid odor. [Note: In solid form (below 15°F) it is found structurally as N2O4.] source: NIOSH NPG, accessed: 2019-09-02
O2
Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04
Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04.
(b)i do not