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Questions in chemistry

[Terjawab] A scientist wants to determine how many moles of copper (II) oxide (CuO) would be needed to make 8.10 mol of gold (III) oxide [tex]$\left( Au _2 O _3\right)$[/tex]. [tex]$2 Au+3 CuO-Au_2 O_3+3 Cu$[/tex] How many moles of copper (II) oxide would be needed? [tex]$8.10 mol Au _2 O _3$[/tex] [$\square$] [$\square$] mol CuO , [$\square$] mol CuO [tex]$mol Au I _2 O _3$[/tex]

[Terjawab] What is produced when calcium reacts with fluorine in a synthesis reaction? [tex]Ca + F _2 \rightarrow[/tex] ? A. [tex]CaF[/tex] B. [tex]CaF _4[/tex] C. [tex]2CaF[/tex] D. [tex]CaF _2[/tex]

[Terjawab] What is the formula for iron(III) fluoride? A. FeF B. $Fe _3 F_3$ C. $FeF _3$ D. FesF

[Terjawab] Which type of reaction occurs in the core of a nuclear reactor in a nuclear power plant? [tex]HCl + NaOH \rightarrow H _2 O + NaCl[/tex] [tex]{ }_{92}^{235} U +{ }_0^1 n \rightarrow{ }_{38}^{90} Sr +{ }_{54}^{143} Xe +3_0^1 n[/tex] [tex]{ }_{38}^{90} Sr +{ }_{54}^{143} Xe +3_0^1 n \rightarrow{ }_{92}^{238} U +{ }_0^1 n[/tex] [tex]C _{10} H _8+12 O _2 \rightarrow 10 CO _2+4 H _2 O[/tex]

[Terjawab] 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 pH of a solution if the concentration of hydrogen ions is [tex]$5.0 \times 10^{-4}$[/tex] moles per liter? A. 2.7 B. 3.0 C. 3.3 D. 3.6

[Terjawab] Which of the following numbers does not have a total of four significant figures? 103.2 0.0003403 0.0202 0.1090

[Terjawab] Use the specific heat values to answer the following question: Which of the following has the smallest heat capacity?

[Terjawab] Which process occurs when oxygen combines chemically with another substance to create a new compound? A. Conflagration B. Pyrolysis C. Oxidation D. Combustion

[Terjawab] If the FDA determines that an IND is not required in a drug study, which of the following is true?

[Terjawab] Describe how we can recover alcohol from a mixture of alcohol and water.