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The deltoid and the supraspinatus produce abduction at the shoulder. The subscapularis and the teres major rotate the arm medially, whereas the infraspinatus and teres minor rotate the arm laterally. The supraspinatus, infraspinatus, subscapularis, and teres minor are known as the rotator cuff. The coracobrachialis flexes and adducts the shoulder.
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Solder is an alloy containing the metals tin and lead. A particular sample of this alloy weighing was dissolved in acid. All of the tin was then converted to the oxidation state. Next, it was found that of was required to oxidize the to in an acidic solution. In the reaction the chromium was reduced to ion. (a) Write a balanced net ionic equation for the reaction between and in an acidic solution. (b) Calculate the number of grams of tin that were in the sample of solder. (c) What was the percentage by mass of tin in the solder?
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