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Questions in chemistry

[Terjawab] What is revealed in the reaction $Ca ( OH )_2(s) \rightarrow Ca ^{2+}(a q)+$ $2 OH ^{-}(a q)$, $\Delta H =-16.71 ?$ A. Heat is one of the reactants. B. The reaction occurs slowly. C. The reaction is endothermic. D. The reaction produces heat.

[Terjawab] A change in which factor will affect the rate of reaction only when gases are involved? A. temperature B. pressure C. surface area

[Terjawab] Which of the following compounds spontaneously hydrolyze to give alcohol? 1. CH3-C=CH2 2. CH2=CH2 3. (CH3)3C-CH=CH2 4. Benzene ring-CH2-CH=CH2

[Terjawab] Practice exercise 1 1. Convert the following masses into kilograms. a) 58 475 μg b) 406 dg c) 1 900 cg d) 945 Dg e) 1 854 mg f) 23 tonnes

[Terjawab] I need help please this is orgo 2 please answer must be right

[Terjawab] Identify the oxidation state of H in [tex]H _2(g)[/tex]. [tex]Mg ( s )+2 HBr ( aq ) \rightarrow MgBr _2( aq )+ H _2(g)[/tex] A. +1 B. -1 C. 0 D. +2 E. -2

[Terjawab] Which equation has both a liquid and a gas as products? [tex]2 HgO ( s ) \rightarrow 2 Hg ( l )+ O _2(g)[/tex] [tex]2 Mg ( s )+ O _2(g) \rightarrow 2 MgO ( s )[/tex] [tex]2 KClO _8(s) \rightarrow 2 KCl ( s )+3 O _2(g)[/tex] [tex]Mg ( s )+2 HCl ( aq ) \rightarrow H _2(g)+ MgCl _2( aq )[/tex]

[Terjawab] A. Unscramble the letters to form action words that may result in physical change in matter. 1. UTC 2. ZESUEQE 3. OCHP 4. IESLC 5. CSHUR 6. ESHVA 7. MEHARM 8. SERSP 9. RATE 10. ENBD

[Terjawab] Select the correct answer. Excess sodium hydroxide is added to a solution containing 4.6 grams of magnesium chloride. A reaction takes place according to this equation: [tex]2 NaOH(aq)+MgCl_2(aq) \rightarrow 2 NaCl(aq)+Mg(OH)_2(s)[/tex] The magnesium hydroxide produced by the reaction was collected and weighed. If the mass of the magnesium hydroxide was 2.7 grams, what was the percent yield? Use the periodic table. A. [tex]48 \%[/tex] B. [tex]59 \%[/tex] C. [tex]61 \%[/tex] D. [tex]96 \%[/tex]

[Terjawab] What is the conjugate base that is formed when carbonic acid is dissolved in water? A. $H _3 O ^{+}$ B. $HCO _3^{-}$ C. $CO _3{ }^{2-}$