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Questions in chemistry

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

[Answered] Which element has 16 protons in its nucleus? A. neon B. oxygen C. sodium D. sulfur

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

[Answered] What is the formula for copper(II) chloride? $CuCl _2$ $ClCu _2$ $Cu _2 Cl$ $Cu _2 Cl _2$

[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

[Answered] Which model represents the ionic compound sodium oxide, $Na _2 O$ ? A. Na B. 2 Na C. $Na : O _{\bullet \bullet}^{\bullet}: Na$

[Answered] Which element is the least reactive, based on the data? | | I (ion) | J (ion) | K (ion) | L (ion) | | :-------- | :----------- | :----------- | :----------- | :----------- | | Element I | X | Color change | Color change | Color change | | Element J | Color change | x | x | x | | Element K | Color change | x | x | Color change | | Element L | x | x | x | x | "X" indicates no reaction A. Element L B. Element I C. Element J D. Element K

[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 | | :---------------- | :--------------- | | $Se _4 S_4$ | | | $XeF _6$ | | | $SAs _2$ | | | $XeO _3$ | | | $NH _3$ | |

[Answered] One brand of vinegar has a pH of 4.5. Another brand has a pH of 5.0. The equation for the pH of a substance is [tex]$pH =$ $-\log \left[ H ^{+}\right]$[/tex], where [tex]$H +$[/tex] is the concentration of hydrogen ions. What is the approximate difference in the concentration of hydrogen ions between the two brands of vinegar? [tex]$2.2 \times 10^{-5}$[/tex] [tex]$3.2 \times 10^{-1}$[/tex] [tex]$3.2 \times 10^1$[/tex] [tex]$6.8 \times 10^4$[/tex]

[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 | |---|---| | [tex]$SeS _2$[/tex] | $\square$ | | [tex]$XeF _6$[/tex] | $\square$ | | [tex]$Se _4 S_4$[/tex] | $\square$ | | [tex]$XeO _3$[/tex] | $\square$ | | [tex]$NH _3$[/tex] | $\square$ |