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Questions in chemistry

[Homework Help] What causes pressure changes of reactants to affect the reaction rate? A. The boiling point of the gas is changed. B. The speed of the molecules is changed. C. The temperature of the molecules is changed. D. The frequency of collisions is changed.

[Homework Help] Choose the chemical equation that is correctly balanced. A. [tex]2 Ca ( s )+ Cl _2(g) \rightarrow CaCl _2(s)[/tex] B. [tex]4 Mg ( s )+ O _2(g) \rightarrow 2 MgO ( s )[/tex] C. [tex]Li ( s )+ Cl _2(g) \rightarrow 2 LiCl ( s )[/tex] D. [tex]C ( s )+ O _2(g) \rightarrow CO _2(g)[/tex]

[Homework Help] Which best describes an element? A. a pure substance B. a type of a mixture C. a pure compound D. an impure substance

[Homework Help] Find the mass of [tex]$AlCl _3$[/tex] that is produced when 25.0 grams of [tex]$Al _2 O _3$[/tex] react with excess HCl according to the following equation: [tex]$Al_2 O_3(s)+6 HCl(a q) \rightarrow 2 AlCl_3(a q)+3 H_2 O(l)$[/tex] A. 65.4 g B. 72.9 g C. 155 g D. 16.3 g E. 32.6 g

[Homework Help] What are "representative elements"? A. Elements in the same row of the periodic table B. Elements in the tall columns of the periodic table C. Elements in the short columns of the periodic table D. Elements that share the same properties on the periodic table

[Homework Help] Which of the following is the correct Lewis structure for nitrogen gas, [tex]$N _2$[/tex]?

[Homework Help] What is the coefficient of oxygen gas after balancing the following equation? [tex]N_2(g) + O_2(g) \rightarrow N_2O_5(s)[/tex] A. 4 B. 5 C. 2 D. 1

[Homework Help] Which of the following is a SYNTHETIC polymer? A. nucleic acids B. protiens C. cellulose D. polyethylene E. sugars

[Homework Help] The following reaction occurs in a car's catalytic converter. [tex]2 NO(g)+2 CO(g) \longrightarrow N_2(g)+2 CO_2(g)[/tex] Which answer best describes the reducing and oxidizing processes in this reaction? A. NO and CO are both reducing agents. B. NO and CO are both oxidizing agents. C. The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds. D. The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.

[Homework Help] What is the rate of a reaction if the value of [tex]k[/tex] is 0.1, [tex][A][/tex] is 1 M, and [tex][B][/tex] is 2 M? Rate [tex]=K[A]^2[B]^2[/tex] A. [tex]0.8(mol / L ) / s[/tex] B. [tex]0.1(mol / L ) / s[/tex] C. [tex]0.2(mol / L ) / s[/tex] D. [tex]16(mol / L ) / s[/tex]