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Questions in chemistry

[Answered] The elements which tend to achieve a two-electron configuration in the valence shell: (a) Hydrogen (b) Lithium (c) Beryllium (d) All of these

[Answered] Complete this activity to identify basic chemical structure. Match the words to their definitions. Match each item to a choice: Choices: Matter Element Chemistry Simplest form of chemical matter The science that deals with the composition, structures, and properties of matter Any substance that occupies space and has mass

[Answered] What is the mass of [tex]$1.8 \times 10^{24}$[/tex] molecules of [tex]$CO_2$[/tex]? ([tex]$1 mol CO_2=44.01 g$[/tex]) ([tex]$1 mol CO_2=6.02 \times 10^{23}$[/tex] molecules) [?] [tex]$g CO_2$[/tex]

[Answered] Sulfur dioxide reacts with chlorine to produce thionyl chloride. [tex]SO_2(g)+2 Cl_2(g) \rightarrow SOCl_2(g)+ Cl _2 O ( g )[/tex] If 0.400 mol of [tex]Cl _2[/tex] reacts with excess [tex]SO _2[/tex], how many moles of [tex]Cl _2 O[/tex] are formed? A. 0.400 mol B. 0.200 mol C. 0.0500 mol D. 0.100 mol E. 0.800 mol

[Answered] Ethanol, an organic compound, has the following structural formula. What is the chemical formula for ethanol? A. $CH _6 O$ B. $C _2 H _5 O$ C. $C _2 H _5 O _2$ D. $C _2 H _6 O$

[Answered] What Group is Zn (zinc) in? A. 12 B. 30 C. 2 A D. 4

[Answered] Select the correct answer. How would adding the catalyst nitrogen monoxide (NO) affect this reaction? [tex]2 SO_2(g)+O_2(g) \rightarrow 2 SO_3(g)[/tex] A. NO increases the rate at which [tex]SO _3[/tex] molecules are formed. B. NO reacts with [tex]SO _3[/tex] to produce more [tex]SO _2[/tex] molecules. C. NO decreases collisions between the [tex]SO _2[/tex] and [tex]O _2[/tex] molecules. D. NO increases the concentration of the [tex]SO _2[/tex] and [tex]O _2[/tex] molecules. E. NO increases the activation energy of the [tex]SO _2[/tex] and [tex]O _2[/tex] molecules.

[Answered] Which of the following is NOT a common source of particulate matter? A. volcanic dust B. salt particulates C. CFC's D. pollen

[Answered] Which pair of ions can form an ionic bond with each other and why? A. [tex]Cu ^{+}[/tex] and [tex]Ag ^{+}[/tex]; They are both metal ions. B. [tex]S ^{2-}[/tex] and [tex]O ^{2-}[/tex]; They have like charges. C. [tex]Br ^{-}[/tex] and [tex]At ^{-}[/tex]; They are both halogen ions. D. [tex]Li ^{+}[/tex] and [tex]Br ^{-}[/tex]; They have unlike charges.

[Answered] The elements beryllium, calcium, and strontium are all in group 2. What is the correct relationship of these elements regarding their ionization energy? A. [tex]$Ca \ \textless \ Be \ \textless \ Sr$[/tex] B. [tex]$Sr \ \textless \ Be \ \textless \ Ca$[/tex] C. [tex]$Be \ \textless \ Ca \ \textless \ Sr$[/tex] D. [tex]$Sr \ \textless \ Ca \ \textless \ Be$[/tex] E. [tex]$Ca \ \textless \ Sr \ \textless \ Be$[/tex]