If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at
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1995
Which of the following is a example of a chemical change?
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1995
Chromatography is used to separate components of mixtures which differ in their rates of?
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1995
A liquid begins to boil when?
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1995
Two cylinders A and B each contains 30 cm3 ofOxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is?
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1995
A gas sample with an initial volume of 3.25 dm3 is heated and allowed to expand to 9.75 dm3 at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?
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1995
What volume of oxygen will remain after reacting 8cm3 of hydrogen with 20cm3 of oxygen?
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1995
The number of hydrogen ions in 4.9 g of tetraoxosulphate (IV) acid is?(S = 32, O =16, H = 1, Na = 6.02 x 1023
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1995
Helium is often used in observation balloons because it is?
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1995
Which of the following statements is FALSE about isotopes of the same element?
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1995
The ability of ionic solids is generally due to the?
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1995
In the oil drop experiment, Millikan determined the?
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1995
A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as?
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1995
Neutralization involves a reaction between H3O+ and?
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1995
In general, an increase in temperature increases the solubility of a solute in water because?
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1995
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?
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1995
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
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1995
Deliquescent substances are also?
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1995
Cr2O72-(aq) + 14H+(aq) + 6l-(aq) → 2Cr3+(aq) + 3l(g) + 7H2O(I).The change in the oxidation number of oxygen in the equation above is?