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Questions in chemistry

[Solved] Consider the equation below. [tex]$CaCO _3(s) \longleftrightarrow CaO ( s )+ CO _2(g)$[/tex] What is the equilibrium constant expression for the given reaction? A. [tex]$K _{\infty}=\frac{[ CaO ]}{\left[ CaCO _3\right]}$[/tex] B. [tex]$K _{\theta q}=\frac{\left[ CO _2\right][ CaO ]}{\left[ CaCO _3\right]}$[/tex] C. [tex]$K _{ eq }=\left[ CO _2\right]$[/tex] D. [tex]$K_{e q}=\frac{1}{\left[ CO _2\right]}$[/tex]

[Solved] What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase? [tex]$HCl ( aq )+ NaOH ( aq ) \rightarrow NaCl ( s )+ H _2 O ( l )$[/tex] [tex]$H _2 SO _4( aq )+ Ca ( OH )_2( aq ) \rightarrow CaSO _4( aq )+2 H _2 O ( l )$[/tex] [tex]$H _2 SO _4( aq )+2 NaOH ( aq ) \rightarrow Na _2 SO _4( aq )+2 H _2 O ( l )$[/tex] [tex]$2 H _3 PO _4( aq )+3 Ca ( OH )_2( aq ) \rightarrow Ca _3\left( PO _4\right)( s )+6 H _2 O ( l )$[/tex]

[Solved] Given that one mole of sodium hydroxide reacts with one mole of $NaCl + HCl$, calculate the concentration of the hydrochloric acid.

[Solved] How many different sublevels are in the third energy level? A. 3 B. 1 C. 2 D. 4

[Solved] What type of bond is formed when lithium and fluorine reacts? Explain. (Atomic numbers [tex]$Li = 3$[/tex] and [tex]$F = 9$[/tex])

[Solved] Bacteria that help to create a new bacterial strain using different genetic information from different bacteria that play a role in purifying and/or cleaning water using carbon dioxide

[Solved] The table below gives the numbers of protons, electrons, and neutrons in four atoms. | Atom | Number of protons | Number of neutrons | Number of electrons | |---|---|---|---| | 1 | 9 | 8 | 9 | | 2 | 9 | 9 | 8 | | 3 | 9 | 9 | 10 | | 4 | 9 | 10 | 9 | Based on the table, which atom has a charge of -1?

[Solved] Which of the following notations is the correct noble gas configuration for Co? A. $[Ar] 4s^2 4p^6 3d^1$ B. $[Kr] 4s^2 4p^6 4d^1$ C. $[Co] 4s^2 3d^7$ D. $[Ar] 4s^2 3d^7$

[Solved] How is the [tex]$\Delta H_{\text {vap }}$[/tex] used to calculate the mass of liquid boiled by 1 kJ of energy? A. [tex]$1 kJ \times \Delta H_{\text {vap }} \times g / mol \text{ liquid}$[/tex] B. [tex]$1 kJ \times 1 / \Delta H_{\text {vap }} \times g / mol$[/tex] liquid C. [tex]$1 kJ \times 1 / \Delta H_{\text {vap }} \times mol / g$[/tex] liquid D. [tex]$1 kJ \times \Delta H_{\text {vap }} \times mol / g$[/tex] liquid

[Solved] Number of electrons present in 8.4 g of CO is: A. 0.3 N_A B. 1.4 N_A C. 2.8 N_A D. 4.2 N_A