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Questions in chemistry

[Terjawab] Select the correct answer. In the following reaction, how many liters of oxygen will react with 270 liters of ethene [tex]$\left( C _2 H _4\right)$[/tex] at STP? [tex]$C_2 H_{4(g)}+3 O_{2(g)} \rightarrow 2 CO_{2(g)}+2 H_2 O_{(g)}$[/tex] The volume of one mole of gas at STP is 22.4 liters. A. 810 liters B. 135 liters C. 90 liters D. 540 liters

[Terjawab] In an exothermic reaction, what happens to the surroundings? A. The thermal capacitance is increased. B. The activation energy is restored. C. The temperature increases. D. The temperature decreases.

[Terjawab] What is the second quantum number of a [tex]$2 s^2$[/tex] electron in phosphorus, [tex]$1 s^2 2 s^2 2 p^6 3 s^2 3 p^3$[/tex]? A. [tex]$I=3$[/tex] B. [tex]$I=0$[/tex] C. [tex]$I=1$[/tex] D. [tex]$1=2$[/tex]

[Terjawab] Which solution of gas dissolved in water can contain the most gas molecules?

[Terjawab] Name the following groups: | | | | :---------- | :--------------- | | [tex]$CH_3-$[/tex] | Amine | | [tex]$CH_3CH_2CH_2CH_2CH_2-$[/tex] | Hydroxyl group | | | Methyl group |

[Terjawab] Consider the equations below. (1) $Ca ( s )+ CO _2(g)+\frac{1}{2} O _2(g) \rightarrow CaCO _3(s)$ (2) $2 Ca ( s )+ O _2(g) \rightarrow 2 CaO ( s )$ How should you manipulate these equations so that they produce the equation below when added? Check all that apply. $CaO(s)+CO_2(g) \rightarrow CaCO_3(s)$ A. Reverse the direction of equation (2) B. Multiply equation (1) by 3 C. Multiply equation (2) by $1 / 2$

[Terjawab] The elements on the current periodic table are placed in order of increasing... a) density b) atomic number c) boiling point d) atomic mass

[Terjawab] "Metals are good conductors of electricity" is an example of a A. hypothesis B. theory C. law D. qualitative observation E. quantitative observation

[Terjawab] What could the fourth quantum number of a $3 p^3$ electron be? A. $m_s=+1$ B. $m_s=0$ C. $m_s=-\frac{1}{2}$ D. $m_s=-1

[Terjawab] If lime juice has a pH of 1.7, what is the concentration of hydrogen ions (in [tex]$mol / L$[/tex]) in lime juice, to the nearest hundredth? Use the formula [tex]$pH=-\log [H+]$[/tex].