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4 years ago

What do electrons determine? need answer now

Chemistry

2 answers:

natima [27]4 years ago

4 0

It determines the electrical charge

iVinArrow [24]4 years ago

4 0

The number of electrons is the same as the number of protons, and so they are involved in the mass, and identity of the element, and the charge if the electrons and protons don’t add up to the same number..

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What do you think the volume of a prescription bottle would be? plz help me

GrogVix [38]

Answer: about 5 Mg

Explanation:

Because that sounds right

7 0

4 years ago

Gold has an atomic weight of 196.97 g/mol, and a density of 19.3 g/cm3. Approximately how many atoms are in a spherical gold nan

ale4655 [162]

Answer: The number of atoms in spherical gold nano particle are $26.918\times 10^4$

Explanation:

To calculate the volume of sphere, we use the equation:

$V=\frac{4}{3}\pi r^3$

where,

r = radius of the sphere = $10nm=10^{-6}cm$ (Conversion factor: $1nm=10^{-7}cm$ )

Putting values in above equation, we get:

$V=\frac{4}{3}\times 3.14\times (10^{-6})^3\\\\V=4.19\times 10^{-18}cm^3$

To calculate mass of of the substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Volume of gold = $4.19\times 10^{-18}cm^3$

Density of gold = $19.3g/cm^3$

Putting values in above equation, we get:

$19.3g/cm^3=\frac{\text{Mass of gold}}{4.19\times 10^{-18}}\\\\\text{Mass of gold}=8.0867\times 10^{-17}g$

To calculate the number of moles, we use the equation:

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

Mass of gold = $8.8067\times 10^{-17}g$

Molar mass of gold = 196.97 g/mol

Putting values in above equation, we get:

$\text{Moles of gold}=\frac{8.8067\times 10^{-17}g}{196.97g/mol}=4.47\times 10^{-9}moles$

According to mole concept:

1 mole of an element contains $6.022\time 10^{23}$ number of atom

So, $4.47\times 10^{-19}$ moles of gold will contain = $4.47\times 10^{-19}\times 6.022\times 10^{23}=26.918\times 10^4$ number of atoms.

Hence, the number of atoms in spherical gold nano particle are $26.918\times 10^4$

8 0

3 years ago

Which gas law is represented by the following equation: V1/T1 = V2/T2

jasenka [17]

Answer:

Charles's law

Explanation:

The expression:

V1/T1 = V2/T2

represents Charles's law

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

So,

V1/T1 = V2/T2

Pressure and the number of moles are constant

V and T are the volume and temperature

1 and 2 are the initial and final states.

5 0

3 years ago

What is the SI unit of time? OA. second OB. minute OC. hour OD. day Res

BARSIC [14]

$▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪$

The correct choice is ~ A

S.I unit of time is Second

7 0

3 years ago

Before the work of Albert Einstein and other prominent scientists of the early 1900's, the predominant view among

Ivanshal [37]

A wave.

Scientists now recognize that light can behave as both a particle and a wave.

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3 years ago