Expert answer:Semester questions chemistry

Answer & Explanation:11 when you balance a chemical equation, what are you doing?applying Mendeleev’s lawapplying the law of conservation of energyapplying the law of conservation of matterapplying the periodic law12 which of the following equations describes a single -replacement reaction2N2O5(g)–> O2(g)+4NO2(g)Cl2(g) +2Kl(s)–> 2KCl(s)+l2(g)2Na(s)+Cl2(g)–>2NaCl(s)H2(g)+Br2(g)–>2HBr(g)13 which of the following represents a correctly balanced chemical equationNa2CO3(s)–>Na2O(s)+2CO2(g)2ZnS(s)+2HCl(ag)–>4ZnCl2(ag)+H2S(g)4Al(s)+3O2(g)–>2Al2O3(s)Zn(s)+2HCl(ag)–>2ZnCl2(ag)+H2(g)14 hydrogen gas and nitrogengas can react to form ammonia according to the following equationN2(g)+3H2(g)–>2NH3(g)how many liters of nitrogen gas are required to produce 2 moles of NH3(g)? one mole of gas occupies 22.4 liters under standard condtions of temperature and pressure STP11.2L22.4L44.8L67.2L15 methane CH4, ammonia NH3, and oxygen can react to form hydrogen cyanide HCN and water according to this equation2CH4+2NH3+3O2–>2HCN+6H2Oabout how many grams of methane are required to produce 1 mole of HCN?48g16g24g34g16 Carbonic acid H2CO3 forms when carbon dioxide CO2 dissolves in water according to this equationCO2+H2O–>H2CO3How many moles of CO2 must dissolve in an excess of water to produce 3 moles of H2CO3?3mol1mol2mol4mol17 which of the following is a mixture of a gas dissolved in a liquid?liquid hydrogendry ice (solid carbon dioxide)soda popliquid oxygen18 in a smple of which of these elements would you expect to find a sea of electrons surrounding nuclei?NOAuAr19 which of the following reactions often combines one reactant with oxygen?synthesissingle-displacementdouble-displacementcombustion20  which of the following is correctly desribes the subatomic particles in the isotope 44Ca?25 protons 20 elecrtons 24 neutrons20 protons 24 electrons 25 neutrons20 protons 20 electrons 24 neutrons20 protons 24 electrons 20 neutrons

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