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Questions in chemistry

[Terjawab] Which solution will change red litmus to blue? A. HCl (aq.) B. NaCl (aq.) C. CH3OH (aq.) D. NaOH(aq.) 77. Given the equation: H+ + OH- = H2O, which type of reaction does the equation represent? A. Esterification B. Decomposition C. Hydrolysis D. Neutralization 78. Which of the following elements is essential in all organic compounds? A. Nitrogen B. Hydrogen C. Oxygen D. Carbon 79. Naturally occurring polymers are A. starch and nylon B. starch and cellulose C. protein and nylon D. protein and plastic 80. Which of the following compounds is represented by the general formula CnH2n-2? A. Butane B. Butene C. Butyne D. Benzene 81. Compared to the charge and mass of a proton, an electron has A. the same charge and a smaller mass B. the same charge and the same mass C. an opposite charge and a smaller mass D. an opposite charge and the same mass

[Terjawab] An experimenter attempts to carry out a single replacement reaction between solid iodine and a solution of potassium chloride. Which is more reactive, iodine or chlorine? Which of the following equations correctly predicts the products of the reaction? i. [tex]I _2(s)+2 KCl _{( aq )} \rightarrow Cl _{2(g)}+2 KI _{( aq )}[/tex] ii. [tex]I _2(s)+ KCl _{( aq )} \rightarrow KClI _2(s)[/tex] iii. [tex]I _2(s)+2 KCl _{( aq )} \rightarrow 2 K_{( s )}+2 ClI _{( aq )}[/tex] iv. [tex]I _2(s)+ KCl ( aq ) \rightarrow[/tex] no reaction

[Terjawab] Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. | molecular formula | name of compound | | :---------------- | :--------------- | | $CO _2$ | | | $Br _2 O$ | | | CO | | | $BrO _2$ | | | $H _2 O$ | |

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] D. an opposite charge and the same mass 82. Which of the following atom consists of exactly fifteen protons? A. P-32 B. S-32 C. O-15 D. N-15 83. Which of the following three groups represent the most elements classified as metalloids in the periodic table? A. 1, 2 & 3 B. 2, 13 & 14 C. 14, 15 & 16 D. 16, 17 & 18 84. When a metallic atom combines with a non-metallic atom, the non-metallic atom will... A. lose electrons and its size will decrease B. lose electrons and its size will increase C. gain electrons and its size will decrease D. gain electrons and its size will increase 85. Which of the following is a binary compound? A. Hydrogen sulphide B. Hydrogen sulphite C. Ammonium sulphide D. Ammonium sulphate 86. Some students are asked to describe differences between gases and liquids. Three of their suggestions are: I) Gas molecules are further apart II) Gas molecules are smaller III) Liquid molecules vibrate around fixed positions Which suggestions are correct? A. II only B. II only C. III only D. All of the above

[Terjawab] An experimenter attempts to carry out a single replacement reaction between solid potassium and a solution of hydrogen iodide. Which is more reactive - potassium or hydrogen? Which of the following equations correctly predicts the products of the reaction? i. $2 K_{( s )}+2 HI _{( aq )} \rightarrow I _{2( l )}+2 HK _{( aq )}$ ii. $K _{( s)}+ HI _{( aq )} \rightarrow KHI _{( s )}$ iii. $2 K_{( s)}+2 HI _{( aq )} \rightarrow H _{2(g)}+2 KI _{( aq )}$ iv. $K _{( s)}+ HI _{( aq )} \rightarrow$ no reaction

[Terjawab] Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. | molecular formula | name of compound | |---|---| | [tex]$Cl _2 O _3$[/tex] | | | [tex]$PCl _3$[/tex] | | | [tex]$PCl _5$[/tex] | | | [tex]$Cl _2 O _7$[/tex] | | | [tex]$H _2 O$[/tex] | |

[Terjawab] What is the formula of the ionic compound $\operatorname{tin}( IV )$ bromide? A. $SnBr _2$ B. $SnBr _4$ C. $Sn _4 Br$ D. $SnB _4$

[Terjawab] An experimenter attempts to carry out a single replacement reaction between solid copper and a solution of hydrogen fluoride. Which is more reactive - copper or hydrogen? Which of the following equations correctly predicts the products of the reaction? i. $2 Cu _{( s )}+2 HF _{( aq )} \rightarrow F _{2(g)}+2 HCu _{( aq )}$ ii. $Cu _{( s )}+ HF _{( aq )} \rightarrow CuHF _{( s )}$ iii. $2 Cu _{( s )}+2 HF _{( aq )} \rightarrow H _{2(g)}+2 CuF _{( aq )}$ iv. $Cu _{( s )}+ HF _{( aq )} \rightarrow$ no reaction

[Terjawab] Drag the tiles to the correct boxes to complete the pairs. Match the chemical name of each oxide of phosphorus to its chemical formula. phosphorus monoxide P407 tetraphosphorus heptoxide P205 diphosphorus pentoxide PO diphosphorus tetroxide P₂04