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Chemistry
Hydrogen sulphide reacts with oxygen to produce sulphur dioxide and water. Determine the mass of sulphur dioxide formed if 5.00 g of hydrogen sulphide reacts with excess oxygen. Clearly show your method of calculation.
Chemistry
A 50.0mL solution containing 0.1M H2SO4 and 0.2M maleic acid is titrated with 0.5M NaOH , calculated the pH after each of the addition, a)zero b)10 mL c)20 mL d)30 mL e)40 mL f)50 g)55 h) 60 i)70 mL of NaOH. *
Chemistry
Dmitri Mendeleev was a chemist who made predictions about elements that had not yet been discovered. One of the elements he made predictions about was gallium. He originally called gallium eka-aluminium , suggest why he may have given the undiscovered element this name
Chemistry
Why ADH is not produced in formation of dilute urine?
Chemistry
Why juxta-medullary nephrons are involved in formation of concentrated urine?
Chemistry
Why ascending limb of loop of henle is thicker than descending limb?
Chemistry
Why glomerulus walls are porous?
Chemistry
What is the [H2CO3], [HCO3-] and pH of a buffer solution which is composed of 25 mL of 0.05 M H2CO3 and 475 mL of 0.263 M NaHCO3? (Ka for H2CO3 = 4.2 x 10-7).
Chemistry
Identify a neutral atom, a negatively charged atom (anion) and a positively charged atom (cation) with the following electron configuration:
1s2 2s2 2p6 3s2 3p6
Neutral atom:
Anion:
Cation:
1s2 2s2 2p6 3s2 3p6
Neutral atom:
Anion:
Cation:
Chemistry
acidic ingredient in vinegar is acetic acid. The pH of vinegar is around 2.4, and the
molar concentration of acetic acid in vinegar is around 0.85 M. Based on this
information, determine the value of the acid ionization constant, Ka, for acetic acid
a) 2.5 × 10–5
b) 5.0 × 10–5
c) 4.7 × 10–3
d) None of the above
