Answered these but got them wrong. Please Help :( Multiple Choice Questions 1).

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Answered these but got them wrong. Please Help :(

Multiple Choice Questions 1). The following reaction: K + NaBr KBr + Na, is an example of A. Synthesis/combination C. Single-displacement B. Decomposition D. Double-displacement 2). What type of reaction is: HgO (s) Hg(l) + O2(g)? A. Synthesis/combination C. Single-displacement B. Decomposition D. Double-displacement 3). What is the coefficient for aluminum after the following equation is balanced Al(s) + Dolg)-) Al2O3(s)? a) 1 b)4 c)3 d)2 4). When solutions of an acid and a base are reacted, the products are B. A salt and water D. A nonmetal oxide and water A. A new acid and a new base C. A metal oxide and water 5). In the following reaction: Ba + MgO Mg + Bao A. Mg and BaO are products C. Ba and MgO are products B. Mg and MgO are products D. Ba and Mg are products 6). Which of the following is evidence that a chemical reaction has occurred? b) Color change d) Evolution of gas a) Formation of a precipitate c) Emission of light e) All of the above 7). What is the value of n when the empirical formula is C,H; and the molecular mass is 205.4 g/mol? A) 0.02 B) 5 C) 10 D) 140 E) none of the above 8). Identify the solid product formed from the balanced reaction of silver nitrate and calcium chloride. a) CaNOs b) AgCI cCa(NO3)2 d) AgN 9). How many moles of oxygen are needed to produce 6 mol of Fe2O3 in the following equation 10). The following reactions KBr(aq) + AgNO3(aq) AgBr(s) + KNO3(aq) s examples of b)acid-base reactions a) c) e) oxidation-reduction reactions precipitation reactions none of these a and c 11). In a reaction to produce ammonia, the theoretical yield is 420.g. What is the percent yield if the actual yield is 350.g? A. 83.3% B. 20.0% C. 16.7% D. 120%

Explanation / Answer

(1)

This is an example of a single displacement reaction, because here K replaces Na.

(2)

This is an example of a decomposition reaction, because here one mole of reactant decomposes to give two moles of products.

(3)

The balanced equation is:

4Al + 3O2 ---> 2Al2O3

So the coefficient of Al is 4.

(4)

An acid and a base react to produce a salt and water. This is called the neutralization reaction.

Hope this helps !

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