Categorize each hydrocarbon as being saturated or unsaturated.

Answer:

Melting point of aqueous solution = -10.32 °C

Explanation:

Where,

ΔT_f = Depression in freezing point

k_f = molal depression constant

m = molality

Formula for the calculation of molality is as follows:

density of water = 1 g/mL

density = mass/volume

Therefore,

mass = density × volume

volume = 3 L = 3000 mL

Mass of water = 1 g/mL × 3000 mL

                        = 3000 g

van't Hoff factor (i) for MgCl2 = 3

Substitute the values in the equation (1) to calculate depression in freezing point as follows:

Melting point of aqueous solution = 0 °C - 10.32 °C

                                                          = -10.32 °C

Answer:

The melting point of the solution is - 1.953 °C

Explanation:

In an ideal solution, the freezing point depression is computed as follows:

where:

is the freezing-point depression

is the cryoscopic constant, in this case is equal to 1.86

b is the molality of the solution

i is the van't Hoff factor, number of ion particles per individual molecule of solute, in this case is equal to 3

Molality is defined as follows:

b = moles of solute/kg of solvent

Moles of solute is calculated as follows:

moles of solute = mass of solute/molecular weight of solute

In this case there are 100 g of solute and its molecular weight is 35.5*2 + 24 = 95 g/mole. So, the moles are:

moles of solute = 100 g/(95 g/mol) = 1.05 moles

The mass of solvent is computed as follows:

mass of solvent = density of solvent * Volume of solvent

Replacing with the data of the problem we get:

mass of solvent = 1 kg/L*3 L = 3 kg

Finally, the molality of the solution is:

b = 1.05/3 = 0.35 mol/kg

Then, the freezing-point depression is:

The freezing-point depression is the difference between the melting point of the pure solvent (here water) and the melting point of the solution. We know that the the melting point of water is 0 °C, then:

melting point of water - melting point of the solution = 1.953 °C

melting point of the solution  = 0 °C - 1.953 °C = - 1.953 °C

A solution with a pH of 8.0 is weakly basic. Thus ,the correct option is C.

The pH scale gives the measure of the acidity or basicity of a solution. It ranges from 0 to 14, where a pH of 7 is considered neutral. Solutions which have a pH less than 7 are acidic, while solutions which have  a pH greater than 7 are basic.

In this case, since the pH is 8.0, which is greater than 7, the solution is basic. However, it is important to note that the basicity of the solution is weak, as it is only slightly above neutral.

For example, think of a pH of 8.0 as being similar to water from a freshwater lake. It's not strongly basic like bleach or ammonia, but it still has a slightly basic nature compared to a neutral solution.

Thus, the correct option is C.

Learn more about pH,here:

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Answer:

Calcium

Explanation:

Calcium is needed in our body to make bones (skeletal system) and teeth strong. Apart from making bones and teeth strong, it is required in other body functions such as:

Enabling blood to clot

Helping in muscle contraction

Helping heart muscle in maintaining normal heart beat

About 99% of calcium present in the body is stored in bones. Calcium is stored in bones in the form of calcium phosphate.

Bones continuously replace old calcium with new one. Calcium is not produced in our body. It comes from daily diet, therefore, it essential to take calcium rich diet.