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Questions in chemistry

[Terjawab] The volume of a gas is 0.450 L when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L? Use [tex]P_1 V_1=P_2 V_2[/tex].

[Terjawab] Select the correct answer. Balance the following equation and determine the mole ratio of [tex]$Cl _2$[/tex] to [tex]$CCl _4$[/tex]. [tex]$CS _2+ Cl _2 \rightarrow CCl _4+ S _2 Cl _2$[/tex] A. 1.1 B. [tex]$2: 4$[/tex] C. [tex]$1: 2$[/tex] D. 3:1 E. [tex]$1: 3$[/tex]

[Terjawab] If 6.00 g of carbon is burned completely, what volume of carbon dioxide gas is released at STP? A. 6.0 L B. 11.2 L C. 22.4 L D. 134.4 L

[Terjawab] (d) An aqueous solution of [tex]$2000 cm^3$[/tex] contains 53.0 g of sodium trioxocarbonate (IV). Calculate the concentration in (i) [tex]$g / dm ^3$[/tex] (ii) [tex]$mol / dm ^3$[/tex] [ [tex]$Na =23, C =12, O =16$[/tex] ]

[Terjawab] In which of the following groups do the elements belong to the same period? a) hydrogen, fluorine, and neon b) lithium, sodium, and potassium c) potassium, titanium, and arsenic d) beryllium, carbon, and sulfur

[Terjawab] Consider the equations below. (1) [tex]$Fe _2 O _3(s) \rightarrow 2 Fe ( s )+\frac{3}{2} O _2(g)$[/tex] (2) [tex]$Fe _2 O _3(s)+3 CO ( g ) \rightarrow 2 Fe ( s )+3 CO _2(g)$[/tex] Which equation must be added to equation (1) to produce equation (2)? A. [tex]$CO ( g )+\frac{1}{2} O _2(g) \rightarrow CO _2(g)$[/tex] B. [tex]$3 CO _2(g) \rightarrow 3 CO ( g )+\frac{3}{2} O _2(g)$[/tex] C. [tex]$3 CO ( g )+\frac{3}{2} O _2(g) \rightarrow 3 CO _2(g)$[/tex]

[Terjawab] What electron could have quantum numbers [tex]$n=4, l=2, m l$[/tex] [tex]$=-2, m_S=-\frac{1}{2}$[/tex] ? A. A 4d electron B. A [tex]$4 p$[/tex] electron C. A [tex]$4 s$[/tex] electron D. A [tex]$4 f$[/tex] electron

[Terjawab] Select the correct answer. If 155 grams of potassium (K) reacts with 122 grams of potassium nitrate ($KNO_3$), what is the limiting reagent? $2 KNO_3+10 K \rightarrow 6 K_2 O+N_2$ A. potassium nitrate $(KNO_3)$ B. potassium (K) C. potassium oxide $(K_2 O)$ D. $(N_2)$ E. nitrate $(NO_3)$

[Terjawab] Which of the following is an example of matter undergoing only a physical change? a) carbon (solid) being burnt in air to form carbon dioxide (a gas) b) hydrogen (gas) forming water with oxygen (gas) c) water (liquid) forming steam (gas) after being heated d) chlorine (gas) forming hydrogen chloride (liquid)

[Terjawab] Explain the causes of eutrophication