A known mass of MgCO3 heated and 100cm3 of CO2 is collected at 27°C and at
a pressure of 100kPa. Calculate the mass of:
i. CO2 produced
ii. the orginal carbonate heated
[Mg=24.0, 0 = 16.0, C=12.0 R = 8.3kPadm3K-¹mol-¹ K-¹]
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Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c