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Questions in chemistry

[Answered] 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

[Answered] 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 | | | $BrO _2$ | | | $H _2 O$ | |

[Answered] 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

[Answered] 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

[Answered] 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

[Answered] 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

[Answered] 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 | | :---------------- | :---------------- | | $BI _3$ | | | BP | | | $C _3 S_2$ | | | $CS _2$ | | | $H _2 O$ | |

[Answered] Which atom will have the highest ionization energy? Sr Ba Rb Cs

[Answered] What is the most common ion charge for lithium, Li? A. +1 B. +2 C. -1 D. -2

[Answered] An experimenter attempts to carry out a single replacement reaction between chlorine gas and a solution of sodium bromide. Which is more reactive - chlorine or bromine? Which of the following equations correctly predicts the products of the reaction? i. [tex]Cl _{2(g)}+2 NaBr _{( aq )} \rightarrow Br _{2( l )}+2 NaCl _{( aq )}[/tex] ii. [tex]Cl _2(g)+ NaBr _{( aq )} \rightarrow NaBrCl _2(s)[/tex] iii. [tex]Cl _{20}+2 NaBr _{( aq )} \rightarrow 2 Na _{( s )}+2 BrCl _{( aq )}[/tex] iv. [tex]Cl _{2(g)}+ NaBr _{( aq )} \rightarrow[/tex] no reaction