VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] What are the missing coefficients for the skeleton equation below? [tex]Al_2(SO_4)_3 + \underline{\qquad} KOH \rightarrow \underline{\qquad} Al(OH)_3 + \underline{\qquad} K_2SO_4[/tex] A. 1, 6, 2, 3 B. 1, 3, 2, 3 C. 4, 6, 2, 3 D. 2, 12, 4, 6

[Terjawab] If you need to multiply the following reaction by 2 to be an intermediate reaction in a Hess's law problem, what would be the final value for the enthalpy of reaction you use for this intermediate reaction? [tex]H_2+0.5 O_2 \rightarrow H_2 O, \Delta H=-286 kJ[/tex] A. 572 k B. -572 k C. -286 kJ D. 286 kJ

[Terjawab] How many grams of potassium carbonate are needed to make 400.0 mL of 2.5 M solution? $K_2 CO_3: 138.21 g / mol$

[Terjawab] Which substance is a compound? A. salt B. phosphorus C. sulfur D. oxygen

[Terjawab] 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]

[Terjawab] 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]

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

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

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

[Terjawab] 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