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3 years ago

The motion that occurs because the star is moving towards or away from the earth is known as

Chemistry

2 answers:

mariarad [96]3 years ago

5 0

The answer is transverse

luda_lava [24]3 years ago

3 0

B transverse is the answer

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What’s the balance of this

lukranit [14]

It's the balance of chemical equation.

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3 years ago

WILL MARK BRAINLIEST IF CORRECT

Vlada [557]

Answer:

3 - a heterogeneous mixture

4- Sweet tea is an homogeneous mixture

7 0

3 years ago

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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 of the following will dissolve the fastest

dimulka [17.4K]

Answer:

Saturated.

Explanation:

This explains the solute dissolving faster. It links with the definition of soaked with moisture; drenched.

7 0

3 years ago

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How many atoms are in 23 moles of oxygen ?

Gennadij [26K]

Answer:

23 moles Oxygen × 6.02 × 1023 atoms = 1.3846 × 1025 atoms Oxygen.

Explanation:

7 0

3 years ago