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Index
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Chemistry2/12/2020
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Chapter 1
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Level 1
level: Level 1
Questions and Answers List
level questions: Level 1
Question
Answer
The formula for calcium bisulfate is A) Ca(SO4)2 B) CaS2 C) Ca(HSO4)2 D) Ca2HSO4 E) Ca2S
c
Which of the following pairs is incorrect? A) NH4Br, ammonium bromide B) K2CO3, potassium carbonate C) BaPO4, barium phosphate D) CuCl, copper(I) chloride E) MnO2, manganese(IV) oxide
c
The numbers of protons, neutrons, and electrons in K + are: A) 20 p, 19 n, 19 e B) 20 p, 19 n, 20 e C) 19 p, 20 n, 20 e D) 19 p, 20 n, 19 e E) 19 p, 20 n, 18 e
e
All of the following are true except: A) Ions are formed by adding electrons to a neutral atom. B) Ions are formed by changing the number of protons in an atom's nucleus. C) Ions are formed by removing electrons from a neutral atom. D) An ion has a positive or negative charge. E) Metals tend to form positive ions.
b
Three samples of a solid substance composed of elements A and Z were prepared. The first contained 4.31 g A and 7.70 g Z. The second sample was 35.9% A and 64.1% Z. It was observed that 0.718 g A reacted with Z to form 2.00 g of the third sample. Show that these data illustrate the law of definite composition.
Sample (1): ratio of masses (Z/A) = 7.70/4.13 = 1.785 Sample (2): ratio of masses (Z/A) = 64.1/35.9 = 1.785 Sample (3): ratio of masses (Z/A) = (2.00-0.718)/0.718 = 1.785