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Questions in chemistry

[Terjawab] How many protons, neutrons, and electrons are in this ion? ${ }_{31}^{71} Ga^{3+}$ A. $31 p^+, 40 n^0, 28 e^-$ B. $31 p^+, 40 n^0, 31 e^-$ C. $31 p^+, 71 n^0, 31 e^-$ D. $40 p^+, 31 n^0, 40 e^-$

[Terjawab] Calculate the wavenumber of a beam of infrared radiation with a wavelength of $5.00 \mu m$.

[Terjawab] Select the correct answer. What would cause the equilibrium to shift left in this reaction? [tex]$CO+3 H_2 \rightleftharpoons CH_4+H_2 O$[/tex] A. adding heat to the product mixture B. a faster rate of forward reaction C. increased collisions between CO and [tex]$H _2$[/tex] D. the escape of water from the mixture E. placing the mixture in a cold water bath

[Terjawab] Which would lower the reaction rate? A. Increasing the concentration of reactants B. Raising the value of k C. Decreasing the temperature of the system D. Increasing the temperature of the system

[Terjawab] Will carbon and hydrogen atoms most likely form an ionic bond or a covalent bond?

[Terjawab] Which sample is a pure substance? A. zinc oxide B. sugar dissolved in water C. pond water D. soil

[Terjawab] Find the elements sulfur (S) and oxygen (O) on the periodic table, and then answer the following questions. Is sulfur a metal or a nonmetal? How many valence electrons does a sulfur atom have?

[Terjawab] Calculate the pH at $25^{\circ} C$ of a 0.36 M solution of ethylammonium bromide $\left( C _2 H _5 NH _3 Br \right)$. Note that ethylamine $\left( C _2 H _5 NH _2\right)$ is a weak base with a $p K_b$ of 3.19. Round your answer to 1 decimal place. $pH=$

[Terjawab] Which answer below correctly identifies the type of change and the explanation for the separation of the iron with sulfur? A. physical change because even though a color change occurred, each solid maintained its original properties, which could be seen as soon as the magnet was applied B. physical change because no temperature change was observed, which would be an indicator of chemical change C. chemical change because a color change was observed, which indicated that a new substance was formed D. chemical change because the results depended on the interaction of two substances

[Terjawab] Which of the following compounds are ionic compounds? Check all of the boxes that apply. $CaCl _2$ $C _6 H _{12} O _6$ MgO $Na _2 O$ $SiO _2$