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Questions in chemistry

[Answered] Which of the following BEST illustrates a primary air pollutant? A. Carbon dioxide released from the burning of coal. B. Sulfur trioxide produced when sulfur dioxide reacts with oxygen in the air. C. Ozone produced in photochemical smog. D. Carbon dioxide released through photosynthesis.

[Answered] Which is the electron configuration for bromine? A. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^{10} 4 p^5$ B. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^{10} 4 p^6$ C. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^4 4 s^2 3 d^{10} 4 p^5$ D. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^9 4 p^5$

[Answered] Which substances were ionic? A. Oil B. Cornstarch C. Sodium Chloride D. Sodium Bicarbonate

[Answered] Which compound is an exception to the octet rule? $H _2 O$ HCl $CCl _4$ $ClF _3$

[Answered] A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describes all of the materials he is using in the investigation? A. They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter. B. They are each made of matter. Some are compounds and some are elements. They all contain atoms. C. They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms. D. They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

[Answered] What is a rate law? A. An equation that relates the concentrations of reactants to the rate constant B. An equation that relates the rate constant to the temperature of a reaction C. An equation that relates the rate of a reaction to the equilibrium position D. An equation that relates the reaction rate to the concentrations of the reactants

[Answered] The balanced equation for the reaction occurring when calcium nitrate solution is mixed with sodium phosphate solution is: [tex]3 Ca ( NO _3)_2( aq )+2 Na _3 PO _4( aq ) \rightarrow Ca _3( PO _4)_2( aq )+6 NaNO _3( aq )[/tex]. [tex]3 Ca ( NO _3)_2( aq )+2 Na _3 PO _4( aq ) \rightarrow Ca _3( PO _4)_2(s)+6 NaNO _3( aq )[/tex]. [tex]2 Ca ( NO _3)_2( aq )+3 Na _3 PO _4( aq ) \rightarrow 2 Ca _3( PO _4)_2(s)+6 NaNO _3( aq )[/tex]. [tex]3 CaNO _3( aq )+ Na _3 PO _4( aq ) \rightarrow Ca _3 PO _4( aq )+3 NaNO _3(s)[/tex]. [tex]Ca ( NO _3)_2( aq )+2 NaPO _4( aq ) \rightarrow Ca ( PO _4)_2(s)+2 NaNO _3( aq )[/tex].

[Answered] Which is a characteristic of mixtures? A. They are chemically bonded together. B. They can be classified as pure substances. C. They have fixed ratios between their components. D. They can be separated by physical processes.

[Answered] What is the formula of the ionic compound iron (III) fluoride? A. [tex]Fe _3 F[/tex] B. FeF C. [tex]Fe _3 F_3[/tex] D. [tex]FeF _3[/tex]

[Answered] What is the pH of 0.4100 M NaCN? Be sure to use at least 4 significant figures throughout your calculations; you can only be off by 0.1 pH units.