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4 years ago

Which statement about covalent compounds is true

Chemistry

2 answers:

soldier1979 [14.2K]4 years ago

6 0

I would say it's D. Usually covalent compounds are very brittle so that means that the bond between atoms are weak

lord [1]4 years ago

5 0

Answer is: B. they are poor conductors of heat.

Ionic compounds are good good electricity and heat conductors, because ionic compounds (for example sodium chloride NaCl) have mobile ions (cations and anions) that are able to transfer electrical charge. This compounds also conduct heat, because the ions are next to each other, so energy can be transferred efficiently from one place to another.

On the other hand, covalent compound (for example methane) are usually bad electricity and heat conductors, because molecules aren far from each other, so heat transfer is less efficient. They do not form ions and atoms are less positive and negative than in ionic compounds.

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Calculate the density of an object with a mass of 3.8 g, that when placed in a 10.0 mL graduated cylinder with an initial volume

Arturiano [62]

Answer : The density of an object is 0.93 g/mL

Explanation : Given,

Mass of an object = 3.8 g

Initial volume = 4.5 mL

Final volume = 8.6 mL

First we have to calculate the volume of an object.

Volume of an object = Final volume - Initial volume

Volume of an object = 8.6 mL - 4.5 mL

Volume of an object = 4.1 mL

Now we have to calculate the density of an object.

Formula used:

$\text{Density}=\frac{\text{Mass of an object}}{\text{Volume of an object}}$

Now putting all the given values in this formula, we get:

$\text{Density}=\frac{3.8g}{4.1mL}$

$\text{Density}=0.93g/mL$

Therefore, the density of an object is 0.93 g/mL

3 0

3 years ago

Calculate the energy of the violet light emitted by a hydrogen atom with a wavelength of 410.1 nm.

Ket [755]

Answer:

4.85 x 10⁻¹⁹J

Explanation:

Given parameters:

Wavelength = 410.1nm

Unknown:

The energy of the violet light = ?

Solution:

The energy of a wave can be derived using the expression below;

E = $\frac{hc}{wavelength}$

h is the planck's constant

c is the speed of light

Insert the parameters and solve;

E = $\frac{6.62 x 10^{-34} x 3 x 10^{8} }{410.1 x 10^{-9} }$ = 4.85 x 10⁻¹⁹J

4 0

3 years ago

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Natasha_Volkova [10]

Diffraction:
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3 years ago

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zaharov [31]

Answer:

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Explanation:

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3 years ago

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belka [17]

Answer:

Explanation:

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6 0

4 years ago