Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 441:
The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500cm3 of a solution of X is cooled from 60oC to 20oC.
Options:
A) 0.750 mole
B) 0.950 mole
C) 2.375 moles
D) 4.750 moles
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The correct answer is A .
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Question 442: A solid begins to melt when?
Options:
A) constituent particles acquires a greater kinetic energy
B) energy of vibration of particles of the solid is less than the intermolecular forces
C) constituent particles acquires energy above the average kinetic energy
D) energy of vibration of particles of the solid equals the intermolecular forces
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The correct answer is A .
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Question 443: The IUPAC nomenclature of compound CH3CH2COOCH2CH3 is
Options:
A) propyl ethanoate
B) ethyl butanoate
C) ethyl propanoate
D) methyl butanoate
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The correct answer is C .
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Question 444:
What is the state of matter in which particles are widely spaced and move freely with high kinetic energy?
Options:
A) Liquid
B) Solid
C) Plasma
D) Gas
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The correct answer is D .
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Question 445:
At room temperature and standard pressure, chlorine gas is in which state of matter?
Options:
A) Plasma
B) Solid
C) Liquid
D) Gas
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The correct answer is D .
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Question 446:
The knowledge of half-life can be used to
Options:
A) Create an element
B) Detect an element
C) Split an element
D) Irradiate an element
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The correct answer is C .
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Question 447: In the periodic table, the electrical and thermal conductivities are properties of elements that
Options:
A) decrease across the period and increase down the group
B) increase across the period and decrease down the group
C) decrease across the period and down the group`
D) increase acrosss the period and down the group
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The correct answer is A .
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Question 448: An effect of thermal pollution on water bodies is that the
Options:
A) volume of water reduces
B) volume of chemical waste increase
C) level of oxides of nitrogen increase
D) level of oxygen reduces
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The correct answer is D .
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Question 449:
For the reaction NH4NO2 N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 320 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)
Options:
A) 2.24 dm 3
B) 224 dm3
C) 1.12 dm 3
D) 112 dm 3
E) 4.48 dm 3
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The correct answer is D .
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Question 450: The arrangement of particles in crystal lattices can be studied using
Options:
A) X - rays
B) γ - rays
C) α - rays
D) β - rays
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The correct answer is A .