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3 years ago

Are non-metals malleable and ductile?

1 answer:

3 0

Are the most abundant in nature and, unlike the metals, not are good conductors of heat and electricity, are not malleable and ductile and have no brightness as metals.

hope this helps!.

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When a 0.235-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 ∘C . When a 0.275-g sample

andrew-mc [135]

Answer : The heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole

Explanation :

First we have to calculate the specific heat calorimeter.

Formula used :

$Q=m\times c\times \Delta T$

where,

Q = heat of combustion of benzoic acid = 26.38 kJ/g = 26380 J/g

m = mass of benzoic acid = 0.235 g

c = specific heat of calorimeter = ?

$\Delta T$ = change in temperature = $1.643^oC$

Now put all the given value in the above formula, we get:

$26380J/g=0.235g\times c\times 1.643^oC$

$c=68323.38J/^oC$

Thus, the specific heat of calorimeter is $68323.38J/^oC$

Now we have to calculate the heat of combustion of caffeine.

Formula used :

$Q=c\times \Delta T$

where,

Q = heat of combustion of caffeine = ?

c = specific heat of calorimeter = $68323.38J/^oC$

$\Delta T$ = change in temperature = $1.584^oC$

Now put all the given value in the above formula, we get:

$Q=68323.38J/^oC\times 1.584^oC$

$Q=108224.23J=108.2kJ$

Now we have to calculate the moles of caffeine.

$\text{Moles of caffeine}=\frac{\text{Mass of caffeine}}{\text{Molar mass of caffeine}}$

Mass of caffeine = 0.275 g

Molar mass of caffeine = 194.19 g/mole

$\text{Moles of caffeine}=\frac{0.275g}{194.19g/mole}=0.00142mol$

Now we have to calculate the heat of combustion per mole of caffeine at constant volume.

$\text{Heat of combustion per mole of caffeine}=\frac{108.2kJ}{0.00142mol}=76197.18kJ/mole$

Therefore, the heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole

4 0

3 years ago

What physical properties does lithium have

Ipatiy [6.2K]

Answer:

Lithium has a melting point of 180.54 C, a boiling point of 1342 C, a specific gravity of 0.534 (20 C), and a valence of 1. It is the lightest of the metals, with a density approximately half that of water. Under ordinary conditions, lithium is the least dense of the solid elements.

Appearance: soft, silvery-white metal

Atomic Number: 3

Atomic Radius (pm): 155

8 0

3 years ago

Explain how you can manage the effect of cholesterol on your body

Naily [24]

Answer:

A few change and healthy diet can make us illiminate cholesterol like

Reduce saturated fats. Saturated fats, found primarily in red meat and full-fat dairy products, raise your total cholesterol. ...

Eliminate trans fats. ...

Eat foods rich in omega-3 fatty acids. ...

Increase soluble fiber. ...

Add whey protein.

3 0

3 years ago

What group of plants produce fruit

Dmitriy789 [7]

Gymnosperms are the group of plants that produce fruit..

8 0

4 years ago

Read 2 more answers

Which elements are correctly listed in order of increasing ionization energy? 1. o < f < ne 2. o < s < se 3. n <

madreJ [45]

Ionization energy is the energy required to remove an electron from gaseous atom or ion.
Ionization energy increases from left to right in the periodic table and decreases from up to down
According to this fact we have three correct answers which are 1, 4 and 5 but
There is an exception for this trend is that Nitrogen has higher First ionization energy than Oxygen due to Oxygen has 8 electrons distributed as: 1s² 2s² 2p⁴ so by losing one electron from p it converted to 2p³ (half filled --> more stable) so that the only correct answer is number 1) O < F < Ne

3 0

3 years ago