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19 Jun 2021

Based on the picture, does Gold exhibit Cleavage or Fracture? Why?

Gold has the chemical formula Au. What mineral group is it in? (Examples. Silicates, Sulfates, Native Elements, Halides, Oxides). Why?

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AP Chemistry: The Periodic Table of Elements/Practice Exam

1. Which of the following will react violently with water to form a base?

a. Calcium

b. Cobalt

c. Aluminum

d. Chlorine

e. Potassium

2. As you move from left to right on the periodic table, what generally happens to the boiling point of elements?

a. It increases, then decreases.

b. It increases

c. It remains constant

d. It decreases, then increases.

e. It decreases

3. Which of the following elements is a main group element?

a. Tungsten

b. Manganese

c. Aluminum

d. Copper

e. Gold

4. Given the following information, which element(s) are most likely to lose electrons?

I. Iodine is a member of Group VII (halides).

II. Strontium is located in the second column of the periodic table.

III. Selenium has six valence electrons.

a. Selenium

b. Selenium and Strontium

c. Strontium

d. Idine

5. Which family has the lowest electronegativity?

a. The oxygen family

b. The halogenss

c. The alkaline earth metals

d. The alkali metals

blackraccoon675

Geoguay: "So how much of that super chunk chocolate is scoop of your super chunk chocolate ice cream?" Geogal "Well, in order to tell you I need to take a scoop of the ice cream and drop it on this weighing scale (splat), weigh it. pick out all those chocolate chunks and drop them on another weighing scale (thud), then take the weight of the chunks and divide by the weight of the scoop, multiply by 100 and there you have it: an eye-popping 42 percent (by weight) of super chunk chocolate in my super chunk chocolate ice cream" In lecture we talked about the importance of mineral resources in sustaining our society and that every American consumes about 9 kilograms, or 20 pounds, ofeopper per year. That figure is based on an estimate of the national demand for copper to make such things as electrical wire, tubing, and electronic components (to name just a few) divided by the US. population. Like other metals, the copper you use comes from minerals, which in turn are extracted from earth's crust. Remember from lecture that valuable minerals do not occur in large pockets of pure, solid masses but are widely dispersed throughout earth's crust and mined where geological processes have enriched their concentration. This homework problem will help you appreciate the value of metal in minerals and the volume of rock material that must be processed to meet your annual demand for copper. Back A common "ore" of copper is the mineral chalcopyrite. Chalcopyrite is often the principal ore mineral in "porphyry copper deposits" as presented in class. You have analyzed the physical properties of chalcopyrite in laboratory so you already know some things about it or where to go to refresh your memory. Chalcopyriteis a sulfide mineral so this means it contains more than just copper. In addition to sulfur (S), chalcopyrite contains some iron (Fe) and the proportions of these metals in the mineral are expressed by its chemical formula: CuFeS2. So how much copper (Cu), say by weight percent, is in chalcopyrite? Let's use another copper sulfide mineral as an example ofhow this calculation is made. How much copper is in the mineral chalcocite? Chalcocite is another ore mineral of copper. In order to determine this one needs to know the chemical formula and atomic hts of the included chemical elements. The chemical formula for chalcocite is Cu:S The atomic weight of the chemical elements C and S are 63.55 and 32.07, respectively (this info can be retrieved from a Periodic Ta of the Elements like the one lecture. This means that the chemical formula weight ofchalcocite i 2x63,55 (Cua) 32.07 (S) 159.17 grams (CuzS) and the weight percent of Cu in chalcocite is 127.10 (Cu) divided by 159.17 (Cu2S) x 100 79.85%

3-Chlorobutane, 4-chlorobutane, allyl chloride, 2-chloro-2-methylpropane, 1-chloro-2-methylpropane, 2-bromobutane

a) Which alkyl halides were the most reactive under SN2 conditions? Which were the least reactive? Explain the order of reactivity under SN2 conditions by considering alkyl halide structure, nature of the leaving group, temperature, solvent, etc. Does the experimentally determined order fit what you predicted? Account for any anomalous observations.

b) Which alkyl halides were the most reactive under SN1 conditions? Which were the least reactive? Explain the order of reactivity under SN1 conditions by considering alkyl halide structure, nature of the leaving group, temperature, solvent, etc. Does the experimentally determined order fit what you predicted? Account for any anomalous observations.

Post Lab Questions

(1) Two of your six alkyl halides cannot react via an SN1 mechanism. Which are they? Why are they unreactive under SN1 conditions?

(2) One of your six alkyl halides reacts rapidly via both SN1 and SN2 mechanisms. Which is it, and why is it reactive under both mechanisms?

(3) One of your six alkyl halides is essentially unreactive via either SN1 or SN2 mechanisms. Which is it, and why is it unreactive?

(4) Explain why we used acetone as solvent for the SN2 reactions, and ethanol as solvent for the SN1 reactions.

(5) Allyl chloride is carcinogenic, as you determined in the prelab. Carcinogenic alkylating agents react with DNA bases such as cytosine (below), causing a change in the base structure, DNA mismatches and mutations which can lead to cancer. Draw a plausible reaction of allyl chloride with cytosine, and based on your results from this experiment, explain why allyl chloride is carcinogenic but 2- chlorobutane is not.

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Based on the picture, does Gold exhibit Cleavage or Fracture? Why?

Gold has the chemical formula Au. What mineral group is it in? (Examples. Silicates, Sulfates, Native Elements, Halides, Oxides). Why?

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Based on the picture, does Gold exhibit Cleavage or Fracture? Why? Gold has the chemical formula Au. What mineral group is it in? (Examples. Silicates, Sulfates, Native Elements, Halides, Oxides). Why?

Unlock all answers

Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related questions

Weekly leaderboard

Based on the picture, does Gold exhibit Cleavage or Fracture? Why?

Gold has the chemical formula Au. What mineral group is it in? (Examples. Silicates, Sulfates, Native Elements, Halides, Oxides). Why?