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Questions in chemistry

[Terjawab] Which chemical equation is unbalanced? [tex]$C + O _2 \rightarrow CO _2$[/tex] [tex]$Sr + O _2 \rightarrow 2 SrO$[/tex] [tex]$6 H _2+3 O _2 \rightarrow 6 H _2 O$[/tex] [tex]$H _2+ H _2+ O _2 \rightarrow H _2 O + H _2 O$[/tex]

[Terjawab] d. What are sub-atomic particles? Write down their position in an atom. e. What is meant by the atomic mass of an atom? Write down the atomic mass of oxygen, sodium, aluminium, and argon. f. Define atomic number and atomic weight. g. What is 2n² rule? Calculate the maximum number of electrons found in shell N by using this rule. h. What is valency? Write down the valency of oxygen, magnesium, and calcium. i. What are valence electrons? Write with an example. j. What is duplet and octet state? Describe with an example of each. k. What is molecular formula? Write down the method of writing molecular formula. l. What is molecular weight? How does it differ from atomic weight?

[Terjawab] Compound A has 12 g of carbon combining with 16 g of oxygen. Compound B has 12 g of carbon combining with 32 g of oxygen. What is the simplest ratio of oxygen masses in both compounds? A. 1:2 B. 2:1 C. 3:2 D. 4:3

[Terjawab] What is the mass of $1.450 mol Cd _3 N_2$? A. 124.2 g B. 234.7 g C. 529.6 g D. 738.9 g

[Terjawab] 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

[Terjawab] Please help its chemistry i dont know how to do this i need help immediately

[Terjawab] 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

[Terjawab] 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]

[Terjawab] 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]

[Terjawab] **(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