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Questions in chemistry

[Terjawab] 4. (a) Distinguish between metals and nonmetals. (b) How are metallic sulphates prepared? (c) Define an alloy with a suitable example. What happens when: (any five) a) Sodium is burnt in the atmosphere of carbon dioxide. b) Zinc is dissolved in moderately concentrated nitric acid. c) Copper is heated with concentrated sulphuric acid. (d) Chlorine is passed over finely powdered aluminum. e) Lead is heated in air. f) Iron is allowed to react with very dilute nitric acid. (a) Explain the term functional group, with suitable examples. (b) How will you convert ethylene to formaldehyde? What happens when benzene is heated with concentrated sulphuric acid? (d) Write short note on polyvinyl chloride (b) Describe the convenient method for chlorine gas. (c) How does ammonia react with (i) Heated sodium (ii) Hydrochloric acid (iii) Copper sulphate solution

[Terjawab] Convert the boiling temperature of gold, $2966^{\circ} C$, into kelvin (K). [?] K

[Terjawab] If 100.0 g of ^14C decays until only 6.25 g of carbon is left after 28650 y, what is the half-life of this isotope?

[Terjawab] What is the purpose of the safety data sheet? A. To describe how a chemical is made in the factory. B. To indicate the location of your organization's Hazard Communication Program. C. To state the location of the spill kit for your work area. D. To provide important safety information about hazardous chemicals.

[Terjawab] Define the following terms: 1.1.1 Galvanic cell. 1.1.2 Electrolytic cell. 1.1.3 Oxidation in terms of electron (e-) transfer. 1.1.4 Reduction in terms of electron (e-) transfer. 1.1.5 Oxidation in terms of oxidation numbers. 1.1.6 Reduction in terms of oxidation numbers. 1.1.7 Oxidising agent in terms of oxidation and reduction. 1.1.8 Reducing agent in terms of oxidation and reduction.

[Terjawab] Dimensional Analysis Elephant toothpaste Recipe Consider the following recipe for elephant toothpaste. Use it to help answer the question. How many milliliters of 3% hydrogen peroxide are needed to make 7 liters of elephant toothpaste solution? 350 mL of 3% hydrogen peroxide 100 milliliters 15 g of dry yeast 15 g of dish soap 236 mL of water Yields: 2 L elephant toothpaste solution A. 1,225 milliliters B. 1,523 milliliters C. 503 milliliters

[Terjawab] The balanced chemical equation for the reaction of copper $(Cu)$ and silver nitrate $(AgNO_3)$ is shown below. $Cu + 2AgNO_3 \rightarrow 2Ag + Cu(NO_3)_2$ How many moles of copper must react to form 3.50 mol of Ag? A. 0.175 mol B. 1.75 mol C. 7.00 mol D. 17.0 mol

[Terjawab] What is carbon? A. an organism B. an element C. a compound

[Terjawab] The balanced chemical equation for the reaction of hydrogen and oxygen is shown below. [tex]2 H_2+O_2 \rightarrow 2 H_2 O[/tex] The number of moles of hydrogen that is needed to produce 0.253 mol of water is A. smaller than 0.253 mol. B. much greater than 0.253 mol. C. slightly greater than 0.253 mol. D. equal to 0.253 mol.

[Terjawab] The balanced equation below shows the products that are formed when butane $\left( C _4 H _{10}\right)$ is combusted. $2 C_4 H_{10}+13 O_2 \rightarrow 8 CO_2+10 H_2 O$ What is the mole ratio of butane to carbon dioxide? A. 2:8 B. 1:5 C. 13:8 D. 13:10