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Questions in chemistry

[Terjawab] Which of the following measurements are not equivalent? [tex]$25 mg =0.025 g$[/tex] [tex]$183 L=0.183 kL$[/tex] [tex]$150 ms=0.150 s$[/tex] [tex]$84 cm=8.4 mm$[/tex] [tex]$24 dL =2.4 L$[/tex]

[Terjawab] Which released by the breakdown of CFCs in the atmosphere is responsible for the destruction of the ozone layer? A. Fluorocarbonate B. Carbon monoxide C. Carbon fluoroxide D. None of these is correct E. Catalytic fluoroxide

[Terjawab] Consider the following reaction and identify the product (P): 3-Methylbutan-2-ol (CH3-CH(CH3)-CH(OH)-CH3) reacts with HBr. Possible products include: 1) CH3-CH(CH3)-CH(Br)-CH3 2) CH3-C(CH3)2-CH2Br 3) Br-CH3-C(CH3)-CH2-CH3 4) CH3CH=CH-CH3 Identify the correct product (P).

[Terjawab] A student requires 2.00 L of [tex]$0.100 M NH _4 NO _3$[/tex] from a [tex]$1.75 M NH _4 NO _3$[/tex] stock solution. What is the correct way to get the solution? Use [tex]$M_j V_j=M_f V_f$[/tex]. A. Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L. B. Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L. C. Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L. D. Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L.

[Terjawab] To prepare 9,10-anthraquinone from benzene via benzoylbenzoic acid.

[Terjawab] Choose the products that complete the reaction. The chemical equation may not be balanced. [tex]Al+H_2 SO_4 \rightarrow ?[/tex] A. [tex]Al _2(SO _4)_3+ H _2 O[/tex] B. [tex]Al _2(SO _4)_3+ CO _2+ H _2 O[/tex] C. [tex]Al _2(SO _4)_3+ H _2[/tex]

[Terjawab] What is the pH of a solution with [H+] = [tex]$7.0 \times 10^{-2}$[/tex] ? A. -0.85 B. -1.15 C. 1.15 D. 0.85

[Terjawab] What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase? [tex]$HCl ( aq )+ NaOH ( aq ) \rightarrow NaCl ( s )+ H _2 O ( l )$[/tex] [tex]$H _2 SO _4( aq )+ Ca ( OH )_2( aq ) \rightarrow CaSO _4( aq )+2 H _2 O ( l )$[/tex] [tex]$H _2 SO _4( aq )+2 NaOH ( aq ) \rightarrow Na _2 SO _4( aq )+2 H _2 O ( l )$[/tex] [tex]$2 H _3 PO _4( aq )+3 Ca ( OH )_2( aq ) \rightarrow Ca _3\left( PO _4\right)( s )+6 H _2 O ( l )$[/tex]

[Terjawab] (a) State two differences between a physical change and a chemical change. (b) Complete the table by giving the name of the process of change and the type of change, 'chemical' or 'physical'. | Change | Name of Process | Is it Physical or Chemical Change? | |---|---|---| | (i) Dry carbon dioxide changes into vapour | | | | (ii) Burning of magnesium in the air | | | | (iii) Sugar added into a beaker of water | | | | (iv) Sugar gives rise to carbon and water vapour upon heating | | | | (v) Burning a piece of paper | | |

[Terjawab] Which statement best describes the formula equation [tex]Cl _2(g)+2 KBr ( aq ) \rightarrow 2 KCl ( aq )+ Br _2( I )[/tex] ? A. Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine. B. Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas. C. Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas. D. Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.