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If 25.00 mL of 4.50 M NaOH(aq) is diluted with water to a volume of 750.0 mL, what is the molarity of the diluted NaOH(aq)?
An oxide of nitrogen contains 63.1% oxygen and has a molar mass of 76.0 g/mol. What is the molecular formula for this compound?
1. Chlorophyll, the substance responsible for the green color of leaves, has one magnesium atom per chlorophyll molecule and contains 2.72% magnesium by mass. What is the molar mass of chlorophyl
What is the mass of sodium iodide in 50.0 mL of 2.63 10–2 M NaI(aq)?
What volume of 0.15 M HCl(aq) must be diluted to make 2.0 L of 0.050 M HCl(aq)?.
How is deionised water made using resins
For each of the following complexes:
(NH4)[FeBrx], µeff = 5.92 BM
Nax[Nb(CO)], µeff = 0 BM
i. Explain briefly the hybrid orbitals involved with respect to their structure.
1. Pure substance A is a solid at room temperature. Upon being heated to about 250°C, it gradually liquefies. Upon being cooled to room temperature, the liquid cannot be induced to solidify.
a. Is substance A probably an element or a compound? Explain
b. Has a chemical change occurred? If so, can it be said that the change is endothermic or exothermic?
c. Can it be said that the resulting liquid is an element, based on the information given?
Name three important reagents necessary for the preparation of potassium
If you are provided with three (3) pieces of magnesium of the same site, then you are directed to drop into three (3) test tubes containing 10 cm portions of 0.1m of different acids namely: HCI, H2S04, and CH2COOH In which of the acids will magnesium dissolve faster and why?
