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aliina [53]
2 years ago
10

Is PDB ionic or Covalent?

Chemistry
1 answer:
professor190 [17]2 years ago
7 0

Answer: Sodium chloride ionic , Potassium chloride ionic,  PDB Covalent

Explanation:

You might be interested in
Ethanol (C2H5OH) melts at –114 °C and boils at 78 °C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vapo
alexandr1967 [171]

Answer:

First question

       Q =  36826 \  J

Second  question  

       Q =  52299.7  \  J

Explanation:

From the question we are told that

     The melting point of Ethanol is  T_m  =  -114 ^oC

      The boiling point of Ethanol is  T_b   =  78^ oC

       The enthalpy of fusion of Ethanol is F  =  5.02 \  kJ / mol = 5.02 *10^{3}\  kJ / mol

        The enthalpy of vaporization  of Ethanol is L  =  38.56  \  kJ / mol = 38.56 *10^{3} \  J / mol

         The specific heat of solid Ethanol is  c_e = 0.97 \  J/ g \cdot K

          The specific heat of liquid  Ethanol is c_l  =  2.3 \  J / g \cdot K

           The mass of the Ethanol given is  m =  35.0 \ g

Considering the first question

           The initial  temperature is T_i  =  27^oC

             The final  temperature is  T_f  =  120^oC

Generally the heat required too raise the Ethanol to its boiling point is mathematically represented as

       Q_1 =  m  *  c_l *  (T_b - T_i)

=>      Q_1  =  35.0   *  2.3  *  (  78 - 27)

=>      Q_1  =4106 \ J

Genially the number of moles of Ethanol given is mathematically represented as

         n  = \frac{m}{Z}

Here Z  is the molar mass of Ethanol  with value  Z =  46 g/mol

So

         n  = \frac{35}{46 }

=>      n  = 0.7609 \  mol

Generally the heat of vaporization of the Ethanol is mathematically represented as

         Q_2 = n  * L

=>        Q_2  =0.7809   *  38.56  * 10^{3}

=>        Q_2  =29339  \  J

Generally the heat required too raise the Ethanol from  its boiling point to  T_f  is  mathematically represented as

       Q_3 =  m  *  c_l *  (T_f - T_b)

=>     Q_3 =  35   *   2.3 *  (120 - 78 )

=>     Q_3 = 3381 \  J

Generally the total heat required is  

     Q =  Q_1 + Q_2 + Q_3

=>   Q =  4106    + 29339   + 3381

=>   Q =  36826 \  J

Considering the second question

           The initial  temperature is T_i  =  -120^oC

             The final  temperature is  T_f  =  120^oC

Generally the heat required too raise the Ethanol to its melting  point is mathematically represented as

       Q_1 =  m  *  c_e *  (T_m - T_i)

=>      Q_1  =  35.0   *  0.97  *  ( -114 - (- 120) )

=>      Q_1  = 203.7 \ J

Generally the heat of fusion  of the Ethanol is mathematically represented as

                 Q_2 = n  * F

=>        Q_2  =0.7809   *  5.02 *10^{3}

=>        Q_2  =3920  \  J

Generally the heat required too raise the Ethanol to its boiling point is mathematically represented as

       Q_3 =  m  *  c_l *  (T_b - T_m)

=>      Q_3  =  35.0   *  2.3  *  ( 78 - (- 114) )

=>      Q_3  =15456  \ J

Generally the heat of vaporization of the Ethanol is mathematically represented as

         Q_4 = n  * L

=>        Q_4  =0.7809   *  38.56  * 10^{3}

=>        Q_4  =29339  \  J

Generally the heat required too raise the Ethanol from  its boiling point to  T_f  is  mathematically represented as

       Q_5 =  m  *  c_l *  (T_f - T_b)

=>     Q_5 =  35   *   2.3 *  (120 - 78 )

=>     Q_5 = 3381 \  J

Generally the total heat required is  

     Q =  Q_1 + Q_2 + Q_3+Q_4 + Q_5

=>   Q =  203.7    + 3920   + 15456 +29339+3381

=>   Q =  52299.7  \  J

5 0
3 years ago
Determine the molar mass of CuSO4×5H2O
asambeis [7]
248.72 g/mol

CuSO4 has a molar mass of 159.62. H2O has a molar mass of 18.02, which is multiplied by 5 to reflect the 5 H2O molecules.

159.62+5(18.02)=249.72 g/mol
7 0
3 years ago
At constant temperature, when the volume of a gas is decreased, what happens to its pressure? Select one: a. It increases. b. It
natulia [17]

Answer:

The answer would be

a. it increases

3 0
3 years ago
Which of the following is NOT an indication of a chemical reaction?
PolarNik [594]
A. The substance dissolved. Just because a substance dissolved in a solvent doesn’t mean that a chemical action occurred. For example, if you put sugar in water as stir, it will dissolve, but the chemical make up of the sugar and the water don’t change. A chemical reaction can be indicated by a drastic change in color or temperature or if a substance precipitate.

Hope this helped :)
6 0
2 years ago
Read 2 more answers
The mass of an unidentified metal sphere is 133 grams. Students determine the
Rainbow [258]

Given the data from the question, the identity of the unknown metal having a of mass 133 g is Cobalt

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to determine the density </h3>
  • Mass = 133 g
  • Volume of water = 25 mL
  • Volume of water + metal = 40 mL
  • Vol of metal = 40 – 25 = 15 mL
  • Density =?

Density = mass / volume

Density = 133 / 15

Density = 8.86 g/mL

Comparing the density of the unknown metal (i.e 8.86 g/mL) with those given in the chart in the question above, we can conclude that the unknown metal is Cobalt

Learn more about density:

brainly.com/question/952755

4 0
2 years ago
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