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2 years ago

2. Density is a physical property of a molecule that's measured as mass per unit volume Given that deasity is

Chemistry

1 answer:

expeople1 [14]2 years ago

7 0

Answer: 0.6906 g/cm^3

Explanation:

$$We know that density $=\frac{\text { mass }}{\text { volume }}$\\\\Volume of the cube, $V=l^{3}=(1.500 \mathrm{~cm})=3.375 \mathrm{~cm}^{3}$\\\\Density of the cube $=\frac{2.331 \mathrm{~g}}{3.375 \mathrm{~cm}^{3}}=0.6906 \mathrm{~g} / \mathrm{cm}^{3}$\\\\ \therefore{\text{Density of the cube,} \ $\rho_{\text {cube }}{=0.6906 \mathrm{~g} / \mathrm{cm}^{3}$

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In reversible reaction when do forward reactions take place

kari74 [83]

Answer:

that is true. because reversible react is take place in forward and backward reaction

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3 years ago

Which of the following best captures the point of paragraph 3

givi [52]

Answer:

Is there a picture or smth?

Explanation:

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2 years ago

write equations to show the chemical processes which occur when the first ionization and the second ionization energies of lithi

diamong [38]

Answer:

First ionization of lithium:

$\text{Li}\;(g)\to \text{Li}^{+} \; (g) + \text{e}^{-}$ .

Second ionization of lithium:

$\text{Li}^{+}\;(g) \to\text{Li}^{2+} \;(g) + \text{e}^{-}$ .

Explanation:

The ionization energy of an element is the energy required to remove the outermost electron from an atom or ion of the element in gaseous state. (Refer to your textbook for a more precise definition.) Some features of the equation:

Start with a gaseous atom (for the first ionization energy only) or a gaseous ion. Write the gaseous state symbol $(g)$ next to any atom or ion in the equation.
The product shall contain one gaseous ion and one electron. The charge on the ion shall be the same as the order of the ionization energy. For the second ionization energy, the ion shall carry a charge of +2.
Charge shall balance on the two sides of the equation.

First Ionization Energy of Li:

The products shall contain a gaseous ion with charge +1 $\text{Li}^{+}\;(g)$ as well as an electron $\text{e}^{-}$ .
Charge shall balance on the two sides. There's no net charge on the product side. Neither shall there be a charge on the reactant side. The only reactant shall be a lithium atom which is both gaseous and neutral: $\text{Li}\;(g)$ .

Hence the equation: $\text{Li}\;(g) \to \text{Li}^{+}\;(g) + \text{e}^{-}$ .

Second Ionization Energy of Li:

The product shall contain a gaseous ion with charge +2: $\text{Li}^{2+}\;(g)$ as well as an electron $\text{e}^{-}$ .
Charge shall balance on the two sides. What's the net charge on the product side? That shall also be the charge on the reactant side. What will be the reactant?

The equation for this process is $\text{Li}^{+} \; (g) \to \text{Li}^{2+}\;(g) + \text{e}^{-}$ .

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3 years ago

Energy in Devices. An engineer needs to design a device that transforms light energy into sound energy. Describe a design for a

N76 [4]

Answer:

built a special cavity where the electromagnetic quantum states resonate with the natural vibrations of the atoms. In doing so, one cancouple a photon-based oscillator to a mechanical oscillator, controlling the mechanical quantum states with visible light. The result is a prototype of a quantum transducer, a device that converts light energy into mechanical energy (sound energy)

Explanation:

Sound energy is created by vibrating particles of medium that propagates as a wave. So in order to convert light (electromagnetic wave) to sound wave it has to be converted into electric or magnetic signals. Then these signals can be converted into sound waves.

However, if you consider the particle nature of light. It contains momentum and after collision sets the other particles into oscillatory motion but the wavelength of these vibrations is too high to be considered as sound waves.

4 0

3 years ago

Imagine an alternate universe where the value of the Planck constant is 6.6207 x 10^-36 J*s.

hoa [83]

Answer:

See explanation

Explanation:

According to Louis de Broglie, particles could exhibit wavelike properties and have an associated wavelength.

Now for a turtle with a mass of 450. g, 29. cm long, moving at 2.7 cm/s, recall that we can only describe a by quantum mechanics when the body is very small and its associated wavelength is large.

This object has a large mass, hence it is discussed by classical rather than quantum mechanics

4 0

3 years ago