Which of the following aqueous solutions would have the greatest freezing-point depression?(A) 0.10 m (NH₄)₂SO₄
(B) 0.10 m MnSO₄
(C) 0.10 m NaF
(D) 0.10 m KCI
(E) 0.10 m CH₃OH

Final answer:

Using Charles's law, the calculation indicates a decrease in temperature by about 146.58 degrees Celsius when a 2.00 L volume of gas at 20.0 degrees celsius is compressed to 1.00 L.

Explanation:

To calculate the decrease in temperature due to compression, we can utilize Charles's Law, provided we are ignoring any changes in pressure. Initially, we have a volume (V₁) of 2.00 L at a temperature (T₁) of 20.0 degrees celsius which is equivalent to 293.15 K (converting to Kelvin). The volume is then compressed to 1.00 L (V₂) and we need to find the new temperature (T₂).

According to Charles' Law (V₁/T₁ = V₂/T₂), after we input the values from the problem, we can isolate T₂, resulting in following equation: T₂ = (V₂* T₁)/ V₁. Substituting the given values, we get T₂ = (1.00L*293.15 K)/2.00 L = 146.57 K.

However, we want to find the decrease in temperature in celsius. Difference in temperature in Celsius and Kelvin scales are the same. So, the decrease in temperature (ΔT) = T₁ - T₂ = 20.0°C - (-126.58°C) = 146.58°C. So, when the volume of the gas is compressed from 2.00 L to 1.00 L, the temperature decreases by about 146.58 degrees Celsius.

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Answer is: a pure substance because it is a compound.

Pure substance is made of only one type of atom or only one type of molecule, it has definite and constant composition with distinct chemical properties.

Emerald (beryl) is chemical compound (beryllium aluminium cyclosilicate) with the chemical formula Be₃Al₂(SiO₃)₆.  Pure beryl is colorless.

An emerald can be described as an impure substance because it is a mixture. Therefore, option D is correct.

The chemical formula for emerald is Be₃Al₂(SiO₃)₆, indicating that it is a compound composed of beryllium (Be), aluminum (Al), and silicon (Si) atoms bonded to oxygen (O) atoms.

However, emeralds can also contain impurities or trace elements such as chromium (Cr) or vanadium (V), which give them their characteristic green color.

These impurities or trace elements are present in small amounts and are incorporated into the crystal structure of the emerald.

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Answer: Option (B) is the correct answer.

Explanation:

An ionic solid is a substance which has ionic bonds, that is, formed by the transfer of electrons.

Ionic bonds have strong force of attraction because ionic solids have opposite charges which strongly attract each other.

When we dissolve ionic solid in a beaker of water, it completely dissociate into its ions because polar molecules or solutes dissolve in polar solvents.

For example, when NaCl is dissociated into ions then the reaction is as follows.

Thus, we can conclude that when an ionic solid is placed in a beaker of water then the solute dissolves in it.

Answer:

            The molar mass of a substance is the mass per mole of its entities, where the term entities can describe atoms, molecules, ions or formula units.

Explanation:

                  Molar mass is the mass of any compound divided by mole. Means, if any chemical is given a specific molar mass it means this mass is being given by 6.022 × 10²³ entities of that chemical.

                  The molar mass of any compound is calculated by adding up the atomic masses of all atoms present in that chemical.

Example:

Molar Mass of H₂ =  1.008 + 1.008  =  2.016 g/mol

Molar Mass of NaOH  =  23 + 16 + 1  =  40 g/mol

Molar Mass of HCl =  1 + 35.5  =  36.5 g/mol

Answer:

10 m/s²

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

f is the force

m is the mass

From the question we have

We have the final answer as

10 m/s²

Hope this helps you