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Questions in chemistry

[Terjawab] What type of chemical reaction is illustrated in the following example? [tex]FeBr _3( aq )+ AgNO _3( aq ) \rightarrow Fe \left( NO _3\right)_3( aq )+ AgBr (s)[/tex] A. combination reaction B. decomposition reaction C. single-replacement reaction D. double-replacement reaction

[Terjawab] Select the correct answer. Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants? A. [tex]2 AlBr _3+3 Zn \rightarrow 3 ZnBr _2+2 Al[/tex] B. [tex]CaBr _2+2 Na \rightarrow 2 NaBr + Ca[/tex] C. [tex]MgBr _2+ H _2 \rightarrow 2 HBr + Mg[/tex] D. [tex]BaBr _2+ Ca \rightarrow CaBr _2+ Ba[/tex] E. [tex]2 LiBr + Ba \rightarrow BaBr _2+2 Li[/tex]

[Terjawab] Read and the products with a suitable coefficient. equation by multiplying the reactants The chemical reaction which occurs by the absorption of heat from the surroundings is called an endothermic reaction. The chemical reaction in which heat is released to the surroundings is called exothermic reaction. Test Your Concept Tick $(\sqrt{ })$ the correct alternative (MCQs); a. What is the type of change in which new substances with different properties are formed? A) physical B) chemical C) reversible D) both A) and B) b. What are the substances that take part in a chemical reaction called? A) products B) solution C) reactants D) mixture C. Which one of the following is the example of a chemical reaction? A) melting of ice B) rusting of iron C) making a salt solution D) magnetizing an iron nail d. Which one of the following chemical reactions is an endothermic reaction? A) $C + O _2 \longrightarrow CO _2$ B) $N _2+ O _2 \rightarrow 2 NO$ C) $Zn +2 HCl \longrightarrow ZnCl _2+ H _2$ D) $CaO + H _2 O \longrightarrow Ca ( OH )_2$ - Short answer type questions:

[Terjawab] Which of the following is an organic compound? A. vitamins B. minerals

[Terjawab] 244 Laboratory Manual for General, Organic, and Biological Chemistry 6. Classify each of the following compounds according to its functional group. a. [tex]$CH _3- CH _2- CH = CH - CH _3$[/tex] b. [tex]$CH _3- CH _2- CH _2- OH$[/tex] c. [tex]$CH _3- CH _2- CH _2- O - CH _2- CH _3$[/tex] d. e.

[Terjawab] The table lists the lattice energies of some compounds. | Compound | Lattice Energy (kJ/mol) | | :------- | :---------------------- | | LiF | -1,036 | | LiCl | -853 | | NaF | -923 | | KF | -821 | | NaCl | -786 | Which statement about crystal lattice energy is best supported by the information in the table? A. The lattice energy increases as cations get smaller, as shown by LiF and KF. B. The lattice energy increases as the cations get larger, as shown by LiF and LiCl. C. The lattice energy decreases as cations get smaller, as shown by NaCl and NaF. D. The lattice energy decreases as the cations get smaller, as shown by NaF and KF.

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] Use the periodic table to complete each nuclear fusion equation. ${ }_1^2 H +{ }_1^3 H \rightarrow{ }_2^4 He + {?}^{?} E$ ${ }_7^{14} N+{ }_1^1 H \rightarrow{ }_{?}^{?} E$

[Terjawab] Which of the following gases is expected to have a higher solubility in water than what is predicted using Henry's law? A. [tex]$CH _4$[/tex] B. [tex]$H _2$[/tex] C. [tex]$NH _3$[/tex] D. Ar E. [tex]$N _2$[/tex]

[Terjawab] Consider the chemical reaction in equilibrium: [tex]$H_2+I_2+\text { heat } \Leftrightarrow 2 HI$[/tex] What will happen to the chemical equilibrium if the temperature of the system is increased? A. The direction of the chemical equilibrium will shift to the right, favoring the forward reaction. B. The chemical equilibrium will not be affected by an increase in temperature. C. The direction of the chemical equilibrium will shift to the left, favoring the reverse reaction. D. The chemical equilibrium will be lost permanently with a change of temperature.