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Questions in chemistry

[Done] Classify the following compounds as normal, acid, double, basic, or complex salt. [tex]ZnSO _4, Na _2 Zn ( OH )_4, KHSO _4, Mg \left( NO _3\right)_2, K_4 Fe ( CN )_6, Mg ( OH ) NO _3[/tex], [tex]KAl \left( SO _4\right)_2 .12 H _2 O ,\left( NH _4\right)_2 Fe \left( SO _4\right)_2 .6 H _2 O , Zn ( OH ) Cl , NaHSO , NaHCO _n[/tex] [tex]FeCl _3, CH _3 COONa , Cu \left( NH _3\right)_4 SO _4, Na _2 CO _3[/tex].

[Done] What is the heat of combustion of ethane, $C _2 H _6$, in kilojoules per mole of ethane? Enthalpies of formation can be found in the table of thermodynamic properties. $\\Delta H^*=1560$ $kJ /$ mol ethane

[Done] What is the formula of this binary molecular compound? dinitrogen pentoxide A. ${ }_5 N_2 O$ B. $N _2 O 5$ C. $N (11) O ( V )$ D. $Ni _2 O _3$

[Done] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in the table. | cation | anion | empirical formula | name of compound | |---|---|---|---| | $Mn ^{2+}$ | $SO _3{ }^{2-}$ | | | | $K ^{+}$ | $MnO _4^{-}$ | | | | $Na ^{+}$ | $ClO _3^{-}$ | | |

[Done] What should you do before working with compressed gas? A. Refer to the SDS for the gas and associated hazards B. Be trained in all elements of the hazard communication program C. Know your company's emergency procedures D. All of the choices are correct

[Done] What is the atomic number of this element? [tex]\section*{${ }_{14}^{20} Si$}[/tex] 15 29 43 14

[Done] 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

[Done] 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)

[Done] How many electrons are in this element?

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