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Questions in chemistry

📝 Answered - Which of the following instruments could be used to detect: (a) Cathode ray (b) Geiger counter (c) Voltmeter (d) Mass spectrometer The energy required to remove outer electrons that results in the positive ion is called: (a) electronegativity (b) electrons (c) ionization The nucleus of an atom contains: (a) neutrons and electrons (b) protons (c) protons, neutrons and electrons (d) none of these Which of the following substances is not an isotope of hydrogen: (a) deuterium (b) dronium (c) protium (d) tritium When atoms interact to form a chemical bond, only there: (a) regions are in contact (b) center regions are in contact (c) middle regions are in contact (d) outer regions are in contact

📝 Answered - Please help its chemistry i dont know how to do this i need help immediately

📝 Answered - A 25 mL sample of $0.100 M HNO_3$ completely reacts with NaOH according to this equation: $HNO_3(aq) + NaOH(aq) \rightarrow NaNO_3(aq) + H_2O(l)$ What volume of 0.0500 M NaOH solution is required to completely react with the $HNO_3$? A. 2.50 mL NaOH B. 5.00 mL NaOH C. 25.0 mL NaOH D. 50.0 mL NaOH

📝 Answered - What is the pressure of 0.540 mol of an ideal gas at 35.5 L and 222 K? Use [tex]P V=n R T[/tex] and [tex]R-8314 \frac{L \cdot i P_3}{m \cdot L}[/tex]

📝 Answered - Consider the following reversible reaction: [tex]2 H_2 O(g) \leftrightarrow 2 H_2(g)+O_2(g)[/tex] What is the equilibrium constant expression for the given system? A. [tex]K _{e q}=\frac{\left[ H _2 O \right]}{\left[ H _2\right]\left[ O _2\right]}[/tex] B. [tex]K _{e q}=\frac{\left[ H _2 O \right]^2}{\left[ H _2\right]^2\left[ O _2\right]}[/tex] C. [tex]K _{e q}=\frac{\left[ H _2\right]^2\left[ O _2\right]}{\left[ H _2 O \right]}[/tex] D. [tex]K _{e q}=\frac{\left[ H _2\right]^2\left[ O _2\right]}{\left[ H _2 O \right]^2}[/tex]

📝 Answered - **(a)** Based on Diagram 7.1, (i) Give a homologous series for element M. (ii) Which element has the same homologous series as methane gas? **(b)** Explain how to produce methane gas. **(c)** State one difference between hydrocarbon compounds L and M. **(d)** Based on Diagram 7.2, which energy source is the most environmentally friendly? Explain your answer. Diagram 7.1 shows two examples of hydrocarbon compounds: H H H H | | | | H-C-C-C-C-H | | | | H H H H L H H | | C=C | | H H M Diagram 7.2 shows a graph of carbon dioxide gas emissions from the use of different energy sources: Mass of carbon dioxide (g) 900 820 600 490 300 230 41 38 24 12 0 Energy sources: Coal, Natural gas, Biomass, Solar, Geothermal, Hydro, Nuclear

📝 Answered - Which proportionality applies to Avogadro's law? [tex]$V \propto \frac{1}{P}$[/tex] [tex]$V \propto T$[/tex] [tex]$P \propto T$[/tex] [tex]$V \propto n$[/tex]

📝 Answered - What volume of a $0.100 M \text{AgNO}_3$ solution is required to completely react with the $\text{CaCl}_2$ in 3.00 L of a $0.100 M \text{CaCl}_2$ solution? The balanced chemical equation is: $2 \text{AgNO}_3 + \text{CaCl}_2 \rightarrow 2 \text{AgCl} + \text{Ca(NO}_3)_2$

📝 Answered - Which of the following reactions shows that the formation of $CO _2$ releases $393.5 kJ / mol$? A. $C (s)+ O _2(g) \rightarrow CO _2(g)+393.5 kJ$ B. $C ( s )+ O _2(g)+393.5 kJ \rightarrow CO _2(g)$ C. $C (s)+2 O (g)+393.5 kJ \rightarrow CO _2(g)$ D. $C (s)+ O (g) \rightarrow CO _2(g)+393.5 kJ$

📝 Answered - What is the equilibrium constant for the reaction $N _2(g)+ O _2(g)=2 NO (g)$? A. $K _{ eq }=\frac{[ NO ]}{\left| N _2\right| O _2 \mid}$ B. $K _{24}=\frac{29 MOI }{ N _2\left| O _2\right|}$ C. $K_{eq}=\frac{\left( NO ^2\right.}{ N _2 IO _2 I }$ D. $K_{eq}=\frac{ xMOI ^{+}}{ N _2 \uparrow\left| O _2\right|}$