Abeka Chemistry Chapter 11 fully solved exam study guide (100% accurate expert solutions)download to pass
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Abeka chemistry
Institution
Abeka Chemistry
What is metallurgy?
the science of extracting metals from their naturally occurring materials and preparing them for use
What is an ore?
naturally occurring material containing a metal in sufficient concentration to make its extraction profitable
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ABEKA CHEMISTRY CHAPTER 11 FULLY
SOLVED EXAM STUDY GUIDE 2024-
2025(100% ACCURATE EXPERT SOLUTIONS)DOWNLOAD TO PASS
What is metallurgy? - answer the science of extracting metals from their naturally occurring materials and preparing them for use
What is an ore? - answer naturally occurring material containing a metal in sufficient concentration to make its extraction profitable
List the four general steps in the production of a useful metal from an ore. - answer concentration, reduction, refining, shaping
What process of ore separation involves mixing crushed rock with oil, water, and detergent and agitating it? - answer floatation
Explain why the reactivity of the alkali metals increases with atomic number. - answer Answers will vary. The valence electron becomes farther away from the nucleus as atomic number increases. The electron is therefore more easily lost, making the element more prone to undergo chemical reactions.
How are alkali metals generally prepared? Write a balanced equation for the preparation of K by this method. - answer electrolysis of their molten chloride salts; 2 KCl (l) →electrolysis→2 K(l) + Cl₂(g)
Differentiate between the causes of temporary hard water and permanent hard water. - answer Answers will vary. Permanent hard water contains the fulfate of calcium, magnesium, or iron (II), whereas temporary hard water contains the bicarbonate.
Show by an equation one cause of boiler scale. - answer Ca(HCO₃)₂(aq) →∆→ CaCO₃(s) + CO₂(g) + H₂O(l) Explain how a cation-exchange resin softens water. - answer Positively charged ions such as Ca²⁺, Fe²⁺, and Mg²⁺ in water are exchanged on the resin for Na⁺ or H⁺ ions.
Give one use for each of the following alkaline earth metals
Beryllium
Magnesium
Calcium
Strontium - answer Answers should include some of the following ideas:
beryllium - x-ray tubes; structural materials, alloys used in aircraft, springs, and nonsparking tools; ∙
corrosion-resistant ship parts (also nuclear weapons - chl. 17)
magnesium - incendiary bombs; fireworks; old-fashioned flashbulbs, lightweight alloys (used in wheels, ∙
ladders, metal furniture, aircraft, and spacecraft)
calcium - important nutrient (bones, teeth; nerve excitation, vision, muscle contration); compounds ∙
used in building materials (limestone, cement, concrete, gypsum)
strontium - compounds used in signal flares and fireworks∙
Give the chemical formula for lime - answer CaO
Give the chemical formula for slaked lime - answer Ca(OH)₂
Give the chemical formula for limestone - answer CaCO₃
Give the chemical formula for milk of magnesia - answer Mg(OH)₂
Give the chemical formula for Epsom salts - answer MgSO₄ 7H₂O ∙
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