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Questions in chemistry

[Terjawab] Aqueous solutions of acids conduct electricity because of free moving: (a) Molecules (b) Ions (c) Electrons (d) All of these

[Terjawab] Which substance in this redox reaction is the oxidizing agent? $Cu+2 AgNO_3 \rightarrow 2 Ag+Cu\left(NO_3\right)_2$ A. N B. $AgNO _3$ C. Cu D. $NO _3{ }^{-}$ E. $Cu \left( NO _3\right)_2$

[Terjawab] A student is studying chemical changes and mixes two liquid compounds. Which statement best describes what the student should observe if a chemical reaction is occurring? A. The two substances dissolve. B. A solid substance appears. C. The mass of the substances increases. D. The temperature of the substances stays the same.

[Terjawab] The half-life of a particular radioactive substance is 1 year. If you started with 50 grams of this substance, how much of it would remain after 3 years? Remaining Amount $=50$ ( $1-$ [?]) Remaining Amount $= I (1-r)^{ t }$

[Terjawab] The pOH of a solution is 6.0. Which statement is correct? Use [tex]$pOH =-\log \left[ OH ^{-}\right]$[/tex] and [tex]$pH + pOH =14$[/tex]. A. The pH of the solution is 20.0. B. The concentration of [tex]$OH ^{-}$[/tex] ions is [tex]$1.0 \times 10^{-8} M$[/tex]. C. The concentration of [tex]$OH ^{-}$[/tex] ions is [tex]$1.0 \times 10^6 M$[/tex]. D. The pH of the solution is 8.0.

[Terjawab] Select the correct answer from each drop-down menu. Mendeleev's table of elements was better accepted than those of other scientists at the time because [...]. Moseley went a step further in suggesting that the elements be arranged according to [...].

[Terjawab] Select the correct answer. The half reaction of an oxidation-reduction reaction shows that iron gains electrons. What does this electron gain mean for iron? A. It is neutralized. B. It is oxidized. C. It is reduced. D. It has dissolved. E. It has precipitated.

[Terjawab] A chemical equation lists NaHCO3(s) as a reactant. What does (s) indicate? A. The compound is a solid. B. The compound is a liquid. C. The compound is a gas. D. The compound is dissolved in water.

[Terjawab] Which of the following compounds is the most stable? A. AgCl B. $CuCl _2$ C. $AlCl _3$ D. LiCl

[Terjawab] Which represents the balanced nuclear equation for the beta minus decay of Co-60? ${ }_{27}^{60} Co \longrightarrow{ }_{26}^{60} Fe +{ }_{+1}^0 e$ ${ }_{27}^{60} Co \longrightarrow{ }_{28}^{60} Ni +{ }_{-1}^0 e$ ${ }_{27}^{80} Co +{ }_{+1}^0 e \longrightarrow{ }_{26}^{60} Ni$ ${ }_{27}^{60} Co +{ }_{-1}^0 e \longrightarrow{ }_{26}^{60} Fe