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At 60°C, the reaction, PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) has a K value of12.5. If the reaction quotient, Q, calculated from initial concentrations is 19.8 at 60°C, which of the following statements is correct?


there is more reactant concentration than product concentration


the rate of the reverse reaction is equal to the rate of forward reaction


the system is already at equilibrium


system must shift to the left to reach equilibrium


system must shift to the right to reach equilibrium


Which of the following elements will from a ionic bond with chlorine and why? Calcium, carbon, oxygen and silicon.

What mass of copper will be deposited by the liberation of cu +2 when 0.1f of electricity flow through an aqueous solution of copper II salt(cu= 64)


How many moles are in 3.01x10^23 particles?

Determine the oxidation number of the sulfur in the so²- ions and the so² ions and use this number to each ion.

B)suggest an alternative name for nitrogen monoxide ( NO) using oxidation number

C)determine the oxidation number of a)bromine in-bromine dioxide( Bro²) the Bro² ion and the bro- in. b) nitrogen in : amonia NH²), the NO² ion and dinitrogen monoxide (N²O)



State with a reason, whether each of the following shows oxidation or reduction a)1²(Aq)+2e -----------21(Aq)

B)cu(AQ)-------------------cu²(aq)+e

C)2Br(aq)-----------------br²(aq+2e)


Which of the following measurements has the least absolute uncertainty, 218kg or 860kg ?


which of the following has the least absolute uncertainty, 6.942x104cm3 or 8.70x105cm3 ?


which measurement has the least relative uncertainty 7.02x10-1m or 7x100m ?


Quartz, SiO2, is the most abundant mineral found at Earth's surface and its unique properties make it one of the most useful natural substances. Quartz is a chemical compound consisting of one part silicon and two parts oxygen, what is its percentage composition?​

Identify the type of notation in H2O

Calculate the volume of 0.0500 M EDTA needed to titrate the Ca and Mg in a 0.1612-g sample that is 92.5% dolomite, CaCO 3 ·MgCO 3

(184.4 g/mol)


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