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CHM1011 - Chemistry I - S1 2025
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In a classroom containing metal and plastic chairs, people often say that the metal chairs feel colder than the plastic chairs. This is because:
A piece of iron railway track will get longer when it is in the hot sun, and that is why there are usually gaps between pieces of track.
When the track expands the iron atoms:
A molecule of gaseous dinitrogen tetroxide, N2O4, contains an N-N bond. The bond can break to form two molecules of gaseous nitrogen dioxide, NO2.
Which of the following statements is true?
Heat and Energy
Heat is given off when hydrogen gas burns in air according to the equation:
2 H2 (g) + O2 (g) → 2 H2O (g)
Which of the following is responsible for the heat?
Heat can be best described as:
State functions are inter-related and knowing any two fixes the others. In contrast, path functions are observed only as consequences of a particular process of change. From the list of options below, select the list which ONLY lists variables which are considered to be 'state functions'.
If the enthalpy of a chemical reaction has the value of ΔH = -100 kJ/mol,
When a chemical reaction is measured to give off heat, it is said to be: