All categories

3 years ago

A trend in the periodic table means?

Chemistry

1 answer:

Delvig [45]3 years ago

4 0

Answer:

A periodic trend is a regular variation the properties of an element with increasing atomic number.

Explanation:

You might be interested in

Can synthetic chemicals have origins in nature, or are they completely man-made? Give examples and

Aneli [31]

Yes they can have origins in nature. A bunch of the elements on the periodic table are chemicals and this are basic substances and cannot be man made.

6 0

3 years ago

What is the entropy change of the surroundings

KiRa [710]

Answer: The entropy change of the surroundings will be -17.7 J/K mol.

Explanation: The enthalpy of vapourization for 1 mole of acetone is 31.3 kJ/mol

Amount of Acetone given = 10.8 g

Number of moles is calculated by using the formula:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of acetone = 58 g/mol

Number of moles = $\frac{10.8}{58}=0.1862moles$

If 1 mole of acetone has 32.3 kJ/mol of enthalpy, then

0.1862 moles will have = $\frac{32.3}{1}\times 0.1862=5.828kJ/mol$

To calculate the entropy change for the system, we use the formula:

$\Delta S_{sys}=\frac{\Delta H_{vap}}{T(\text{ in K)}}$

Temperature = 56.2°C = (273 + 56.2)K = 329.2K

Putting values in above equation, we get

$\Delta S_{sys}=\frac{5.828}{329.2}=0.0177kJ/Kmol=17.7J/Kmol$ (Conversion Factor: 1 kJ = 1000J)

At Boiling point, the liquid phase and gaseous phase of acetone are in equilibrium. Hence,

$\Delta S_{system}+\Delta S_{surrounding}=0$

$\Delta S_{surrouding}=-\Delta S_{system}=-17.7J/Kmol$

5 0

3 years ago

Sebastian wants to write the chemical formula for phosphorus tetraoxide. He identifies the chemical symbols as P and O. Which ad

denis23 [38]

Answer:

The answer is B

Explanation:

6 0

3 years ago

Um pacote de iogurte tem 500g de um produto. A quanto equivale essa massa em quilogramas?

Rudik [331]

<span>5 quilos
dfghjjjjjjjjjjjjjjjjj

</span>

6 0

3 years ago

Why is there no set path that a scientific inquiry must follow

Marina CMI [18]

Due to the variables that each inquiry has, Scientific inquiry follows a path of questioning and testing a hypothesis, however this changes in response to specific details.

6 0

3 years ago

Read 2 more answers