Metalloid
Explanation:
If an element is lustrous, brittle and a semi-conductor, it is best classified as a metalloid.
Metalloids shares attributes of metals and non-metals.
- They are often described as semi-metals as they do not share the full properties that makes a metal a metal.
- Metalloids are lustrous but not malleable like metals.
- They do not conduct electricity but they do so on certain conditions.
- Examples are silicon, germanium, boron, arsenic e.t.c
- They are usually found in the middle of the periodic table.
- They are not readily alloyed with metals.
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Answer: -
- 0.348°C is the melting point of a solution in which 2.5 grams of sodium chloride is added to 230 mL of water
Explanation: -
Mass of NaCl = 2.5 g
Molar mass of NaCl = 23 x 1 + 35.5 x 1 = 58.5 g / mol
Number of moles of NaCl = Mass of NaCl / Molar mass of NaCl
= 2.5 /58.5
= 0.043 mol
230mL of water has 0.043 mol.
1000mL of water has (0.043 mol x 1000 mL ) / 230mL
= 0.187 mol
Thus molality of NaCl =0.187 m
The molal freezing point depression constant of water = 1.86 °C/m
Depression in freezing point = 1.86 °C/m x 0.187 m
= 0.348°C
Melting point = 0 - 0.348°C
= - 0.348°C
A because it’s basically a diagram to help you understand it
Answer:
E, only one statement is correct
Explanation:
Absorption is favoured by heating the solution containing the colored impurity.
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Answer:
Molarity = 0.72M
Molality = 0.85M
Explanation:
Molarity and molality are two measures of molar concentration, and they can be calculated as follows:
Molarity = number of moles/volume of solvent
Molality = number of moles/mass (kg) of solvent
Mole = mass/molar mass
Molar mass of stilbene (C14H12) = 12(14) + 1(12)
= 168 + 12
= 180g/mol
mole of stilbene = 13/180
mole = 0.072mol
Volume = 100mL = 0.1L
molarity = 0.072/0.1
Molarity = 0.72M
Molality = number of moles ÷ mass (kg) of solvent
To get mass of solvent, we use;
Density = mass/volume
Mass = density × volume
Mass = 0.85g/mL × 100mL
Mass = 85g
Mass in kg = 85/1000 = 0.085kg
Molality = 0.072/0.085
Molality = 0.847M
Molality = 0.85M