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3 years ago

What properties would you expect for CCl4? Select all that apply.

Chemistry

2 answers:

taurus [48]3 years ago

8 0

Answer is: It is likely a gas or liquid at room temperature.

Carbon tetrachloride or tetrachloromethane (CCl₄) is an organic compound with nonpolar covalent chemical bonds.

1) Carbon tetrachloride is a colourless liquid, used in fire extinguishers.

2) Because it is nonpolar, it is not soluble in polar water.

3) It can not conduct electricity because it is nonpolar compound.

4) Melting point is low -23°C.

marusya05 [52]3 years ago

5 0

Answer: Option (a) is the correct answer.

Explanation:

As both carbon and chlorine are non-metals. Therefore, both of them tend to share their valence electrons in order to attain stability.

Therefore, $CCl_{4}$ is a covalent compound. This is because a compound formed by sharing of electrons by the combining atoms is known as a covalent compound.

And, covalent compounds are brittle in nature due to weak bonding between the combining atoms.

Hence, $CCl_{4}$ will most most likely be a gas or liquid at room temperature and not a solid.

It will also have low melting point and it will not be able to conduct heat and electricity as it is covalent in nature.

Thus, we can conclude that it is likely a gas or liquid at room temperature is the property that you would expect for $CCl_{4}$ .

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What is the quantity of heat (in kJ) associated with cooling 185.5 g of water from 25.60°C to ice at -10.70°C?Heat Capacity of S

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Taking into account the definition of calorimetry, sensible heat and latent heat, the amount of heat required is 37.88 kJ.

<h3>Calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

<h3>Sensible heat</h3>

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

<h3>Latent heat</h3>

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

<u><em>25.60 °C to 0 °C</em></u>

First of all, you should know that the freezing point of water is 0°C. That is, at 0°C, water freezes and turns into ice.

So, you must lower the temperature from 25.60°C (in liquid state) to 0°C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

c= Heat Capacity of Liquid= 4.184 $\frac{J}{gC}$
m= 185.5 g
ΔT= Tfinal - Tinitial= 0 °C - 25.60 °C= - 25.6 °C

Replacing:

Q1= 4.184 $\frac{J}{gC}$ × 185.5 g× (- 25.6 °C)

Solving:

<u><em>Change of state</em></u>

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

n= 185.5 grams× $\frac{1mol}{18 grams}$ = 10.30 moles, where 18 $\frac{g}{mol}$ is the molar mass of water, that is, the amount of mass that a substance contains in one mole.