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Questions in chemistry

[Terjawab] 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

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

[Terjawab] 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]

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

[Terjawab] (d) Liquid sulfur reacts with chlorine to produce disulfur dichloride. [tex]2 S+Cl_2 \rightarrow S_2 Cl_2[/tex] (i) Describe how the general physical properties of a liquid differ from those of a solid. Give two differences. 1. 2.

[Terjawab] The Lewis structure, $[: \ddot{ O }-\ddot{ N }=\ddot{ O }]$ best represents: $NO _2$ $NO _2{ }^{+}$ $NO _2{ }^{-}$ both $NO _2{ }^{+}$and $NO _2{ }^{-}$ answers A, B, and C

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

[Terjawab] An experimenter attempts to carry out a single replacement reaction between solid iron and a solution of magnesium bromide. Which is more reactive, iron or magnesium? Which of the following equations correctly predicts the products of the reaction? i. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow Br _{2( l )}+2 MgFe _{( aq )}[/tex] ii. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow FeMgBr _{2(s)}[/tex] iii. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow Mg _{( s )}+ FeBr _2( aq )[/tex] iv. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow[/tex] no reaction

[Terjawab] What is the most common ion charge for nitrogen? A. +5 B. +7 C. -3 D. -1

[Terjawab] states that in any chemical reaction, the mass of the substances that react equals the mass of the products that are formed. A) The law of conservation of mass B) The law of definite proportions C) The atomic theory of matter D) The law of conservation of matter