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Questions in chemistry

[Terjawab] Using the standard enthalpies of formation, what is the standard enthalpy of reaction? [tex]CO(g)+H_2 O(g) \longrightarrow CO_2(g)+H_2(g)[/tex] [tex]\Delta H_{ rxn }^{\circ}=[/tex] kJ

[Terjawab] What should you use to detect a gas leak? A. Soapy water (if you know the gas does not react to water) B. Flame (if you know the gas is not flammable) C. Oxygen (if you know the gas does not react with oxygen) D. Scent (if you have been trained to recognize the scent of the gas)

[Terjawab] How many electrons are in this element?

[Terjawab] What is the mass notation for [tex]^{29}_{14}[/tex] this element? A. silicon-14 B. silicon-29 C. silver-14 D. silver-29

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]Fe ^{3+}[/tex] | [tex]NO _2^{-}[/tex] | | | | [tex]K ^{+}[/tex] | [tex]SO _4^{2-}[/tex] | | | | [tex]Fe ^{2+}[/tex] | [tex]CH _3 CO _2^{-}[/tex] | | |

[Terjawab] How do you prepare a 1 molar ferric chloride solution?

[Terjawab] Listen Oxides of nitrogen (NOx) contribute to the formation of A) photochemical smog. B) particulate emissions. C) acid rain. D) high levels of CO2.

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

[Terjawab] How many protons are in this element? [tex] { }_{14}^{20} Si [/tex]

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]K^{+}[/tex] | [tex]BrO_4^{-}[/tex] | [tex]\square[/tex] | [tex]\square[/tex] | | [tex]Na^{+}[/tex] | [tex]NO_2^{-}[/tex] | [tex]\square[/tex] | [tex]\square[/tex] | | [tex]K^{+}[/tex] | [tex]BrO^{-}[/tex] | | [tex]\square[/tex] |