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Questions in chemistry

[Terjawab] Study the given table and answer the following questions. | Period | IA | IIA | IIIA | IVA | VA | VIA | VIIA | VIIIA (Zero Group) | |---|---|---|---|---|---|---|---|---| | 2nd | Li | Be | B | C | N | O | F | Ne | | 3rd | Na | Mg | Al | Si | P | S | Cl | Ar | i. Name any one metal with valency 3 and one non-metal with valency 2. ii. Which element is inert in the second period and why? iii. What change will occur in the atomic size of elements while moving from left to right in third period and why?

[Terjawab] Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group has a different answer. Which of the following equations is correctly balanced? [tex]$Ca ( OH )_2+ H _3 PO _4 \rightarrow Ca _3( PO _4)_2+6 H _2 O$[/tex] [tex]$3 Ca ( OH )_2+2 H _3 PO _4- Ca _3( PO _4)_2+6 H _2 O$[/tex] [tex]$3 Ca ( OH )_2+2 H _3 PO _4- Ca _3( PO _4)_2+3 H _2 O$[/tex] [tex]$Ca ( OH )_2+2 H _3 PO _4 \rightarrow Ca _3( PO _4)_2+6 H _2 O$[/tex]

[Terjawab] Predict the products of the following double displacement reactions and balance the equation. a. [tex]Na_2 CO_3(aq)+CuSO 4(aq) \longrightarrow[/tex] b. [tex]\left( NH _4\right)_2 SO _4( aq )+ CaCl _2( aq )[/tex] c. [tex]Na _2 CO _3( aq )+ Cu \left( NO _3\right)_2( aq ) \longrightarrow[/tex] d. [tex]Mg ( OH )_2( aq )+ HNO _3( aq )[/tex]

[Terjawab] $CO_{(1)}+2 H_{2(\,\theta)} \rightarrow CH_3 OH_{(0)}$ Using the following data, what would be the enthalpy change for the reaction? (i) $C _{(s)}+\frac{1}{2} O _{2(s)} \rightarrow CO _{(s)}$ $\Delta H ^0=-110.5 kJ / mol$ (ii) $C _{(\text {a })}+ O _{2(\text { g })} \rightarrow CO _{2(\text { g })}$ $\Delta H ^0=-393.5 kJ / mol$ (iii) $H _{2(g)}+\frac{1}{2} O _{2(s)} \rightarrow H _2 O _{( i )}$, $\Delta H ^0=-285.5 kJ / mol$ (iv) $CH _3 OH _{(1)}+\frac{3}{2} O _{2(\beta)} \rightarrow 2 H _2 O _{(\beta)}+ CO _{2(\beta)}$ $\Delta H ^0=-726.6 kJ / mol$

[Terjawab] Q8. The list contains the electronic configuration of some atoms: 2,8,1 2,7 2,5 2,3 2,8,4 2,5 2,8,7 2,8 i. Which of these atoms are in Group 1 of the periodic table? ii. Which of these atoms are in Group 7 of the periodic table? iii. Which of these atoms are in Group 0 of the periodic table? iv. Write the electronic configuration of an atom in Group 4 of the periodic table.

[Terjawab] Consider the following intermediate chemical equations: [tex]$\begin{array}{l} 2 P(s)+3 Cl_2(g) \rightarrow 2 PCl_3(l) \\ PCl_3(l)+Cl_2(g) \rightarrow PCl_5(s) \end{array}$[/tex] When you combine the intermediate chemical equations, which substance do you cancel out? A. P B. [tex]$Cl _2$[/tex] C. [tex]$PCl _3$[/tex] D. [tex]$PCl _5$[/tex]

[Terjawab] Which of the following is the empirical formula for $C _4 H _8$? A. $CH _4$ B. $CH _2$ C. $C _2 H _2$ D. $C _6 H _6$

[Terjawab] Consider the following intermediate chemical equations: [tex]\begin{array}{l} 2 Na(s)+Cl 2(g) \rightarrow 2 NaCl(s) \\ 2 Na_2 O(s) \rightarrow 4 Na(s)+O_2(g) \end{array}[/tex] In the final chemical equation, NaCl and [tex]O _2[/tex] are the products that are formed through the reaction between [tex]Na _2 O[/tex] and [tex]Cl _2[/tex]. Before you can add these intermediate chemical equations, you need to alter them by: A. multiplying the second equation by ? B. multiplying the first equation by 2. C. multiplying the first equation by (1/2). D. multiplying the second equation by (1/4).

[Terjawab] Formaldehyde, ethylbenzene, and hydrogen sulfide are all chemicals that are: A. toxic B. corrosive C. irritant D. harmless

[Terjawab] Consider the following intermediate chemical equations: [tex]\begin{array}{ll} P_4(s)+3 O_2(g) \rightarrow P_4 O_6(s) & \Delta H_1=-1,640 kJ \\ P_4 O_{10}(s) \rightarrow P_4(s)+5 O_2(g) & \Delta H_2=2,940.1 kJ \end{array}[/tex] What is the enthalpy of the overall chemical reaction [tex]P _4 O _6(s)+2 O _2(g) \rightarrow P _4 O _{10}(s)[/tex] ? A. -4,580 kJ B. -1,300 kJ C. 1,300 kJ D. 4,580 kJ