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3 years ago

4. (08.01 MC)

Chemistry

1 answer:

Lelechka [254]3 years ago

6 0

Answer:

It has a lower density in its solild stae than it does in its liquid state.

Explanation:

Ice floats, allowing life underneath to leave despite the top freezing.

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When copper crystallizes, it forms face-centered cubic cells. The unit cell edge length is 361.5 pm. Calculate the density of co

Olegator [25]

Density of copper can be calculated using the following formula:

$d=\frac{m}{V}$

Here, m is mass and V is volume, thus, to calculate density first calculate mass and volume of copper.

In FCC, number of atoms in a unit cell are 4, atomic mass of Cu is 63.546 g/mol and number of atoms in 1 mole is $6.023\times 10^{23}$ .

Mass of Cu will be:

$m=4 atoms\times \frac{1 mol}{6.023\times 10^{23}}\times \frac{63.546 g}{mol}=4.22\times 10^{-22}g$

Now, volume can be calculate as:

$V=a^{3}$

Here, a is edge length.

First convert edge length from pm to cm

$1pm=10^{-10}cm$

Thus,

$361.5 pm=3.615\times 10^{-8}cm$

Putting the value,

$V=(3.615\times 10^{-8} cm)^{3}=4.72\times 10^{-23} cm^{3}$

Now, from mass and volume density can be calculated as follows:

$d=\frac{m}{V}=\frac{4.22\times 10^{-22}g}{4.72\times 10^{-23} cm^{3}}=8.932 g/cm^{3}$

Therefore, density of copper will be $8.932 g/cm^{3}$ .

8 0

4 years ago

Which is larger, an atom or a molecule??

skad [1K]

A molecule is larger because it is a bond of atoms.

3 0

3 years ago

using volumetric flask, 1.00 g NaOH was dissolved in water to make 500.0 mL solution. calculate the molarity

Aleksandr-060686 [28]

Hey there!:

Molar mass NaOH = 39.997 g/mol

Number of moles ( solute )

n = mass / molar mass

n = 1.00 / 39.997

n = 0.0250 moles of NaOH

Volume in liters:

500.0 mL / 1000 => 0.5 L

Therefore:

Molarity = number of moles / Volume ( L )

Molarity = 0.0250 / 0.5

Molarity = 0.05 M

Hope that helps!

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3 years ago

How to find the charge of an element

katrin2010 [14]

Answer:

the atomic number is how you find the charge

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4 years ago

Order the steps of the experiment below according to the scientific method. 4 Paul calculated the average time to dissolve each

MaRussiya [10]

Answer:

Explanation:

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