SUBSTANCE MELTING POINT(℃) BOILING POINT(℃)
A -188 -42
B -114 35
C 17 118
D 96 344
E 300 580
F 808 1465
(a) Which substance will turn from a liquid to a solid when placed in a refrigerator (temperature = 4℃)
(b) Classify the substance A, B and E into solids, liquids and gases at room temperature.
(c) Which of the following substance has lowest melting point?
(i). A (ii) B (iii) C (iv) E
(d) Which of the following substance is a volatile liquid?
(i). B (ii) D (iii) E (iv)
Answers
SUBSTANCE MELTING POINT(℃) BOILING POINT(℃):
(a) Substance B will turn from a liquid to a solid when placed in a refrigerator with a temperature of 4℃. This is because the melting point of substance B is -114℃, which is below the refrigerator temperature.
(b) Based on the given melting and boiling points, we can classify the substances at room temperature (around 25℃):
- Substance A: It is a gas at room temperature as its boiling point is -42℃, which is below room temperature.
- Substance B: It is a liquid at room temperature as its boiling point is 35℃, which is above room temperature but its melting point is below room temperature.
- Substance E: It is a solid at room temperature as its melting point is 300℃, which is above room temperature.
(c) Among the given substances, substance A has the lowest melting point with a value of -188℃.
(d) Substance B is a volatile liquid. Volatility refers to the tendency of a substance to vaporize or evaporate. Since substance B has a relatively low boiling point of 35℃, it has a higher volatility compared to the other substances listed.
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