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4 years ago

What are two ways in which mixtures differ from compounds??

Chemistry

2 answers:

ValentinkaMS [17]4 years ago

8 0

Answer:

Mixtures can be physically separated whereas compounds cannot. Mixtures are composed of multiple substances but compounds are of only one.

givi [52]4 years ago

5 0

Mixtures are physically combined while compounds are not. Compounds form new substances while mixtures do not

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Consider the calculation of the pressure in kilopascals exerted by 1.25 g of nitrogen gas in a flask of volume 250 mL (0.250 dm3

Harrizon [31]

The amount of the nitrogen gas, N₂ molecules present is 2.68×10²² molecules

<h3>Avogadro's hypothesis </h3>

1 mole of N₂ = 6.02×10²³ molecules

<h3>How to determine the mole of N₂</h3>

We'll begin by calculating the number of mole of N₂. This can be obtained as follow:

Mass of N₂ = 1.25 g
Molar mass of N₂ = 28.02 g/mol
Mole of N₂ =?

Mole = mass / molar mass

Mole of N₂ = 1.25 / 28.02

Mole of N₂ = 0.0446 mole

<h3>How to determine the molecules of N₂ present</h3>

From Avogadro's hypothesis,

1 mole of N₂ = 6.02×10²³ molecules

Therefore,

0.0446 mole N₂ = 0.0446 × 6.02×10²³

0.0446 mole N₂ = 2.68×10²² molecules

Thus, the molecules of N₂ present is 2.68×10²² molecules

Learn more about Avogadro's number:

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6 0

2 years ago

This table compares magnitude and depth of four earthquakes occurring between 1955 - 2017. The surface changes that occur as a r

torisob [31]

Answer:

The correct answer is option B) "Higher-magnitude earthquakes do not always happen deeper in Earth's crust".

Explanation:

The table shows data of magnitude and depth of earthquakes that occurred at different time and at different locations. By analyzing the data we can conclude that higher-magnitude earthquakes do not always happen deeper in Earth's crust. At first glance we can thought that higher-magnitude earthquakes occur at high depth. However, the earthquake of Michoacan have a higher-magnitude than the earthquake of Alexandria (8 and 6.3, respectively), and the earthquake of Michoacan occurred at 12 miles of depth, while the earthquake of Alexandria occurred at 15 miles of depth.

3 0

3 years ago

a calorimeter contained 75.0 g of water at 16.95 C. A 93.3-g sample of iron at 65.58 C was placed in it, giving a final temperat

Nostrana [21]

Answer:- $\frac{382.69J}{0C}$ .

Solution:- Mass of Iron added to water is 93.3 g. Initial temperature of iron metal is 65.58 degree C and final temperature of the system is 19.68 degree C.

temperature change, $\Delta T$ for iron metal = 65.58 - 19.68 = 45.9 degree C

specific heat for the metal is given as 0.444 J per g per degree C.

let's calculate the heat lost by iron metal using the equation:

$q=mc\Delta T$

where, q is the heat energy, m is mass, c is specific heat and delta T is change in temperature. let's plug in the values and calculate q for iron metal:

$q=93.3g(45.9^0C)(\frac{0.444J}{g.^0C})$

q = 1901.42 J

Using same equation we will calculate the heat gained by water.

mass of water is 75.0 g.

$\Delta T$ for water = 19.68 - 16.95 = 2.73 degree C

specific heat for water is 4.184 J pr g per degree C. Let's plug in the values:

$q=75.0g(\frac{4.184J}{g.^0C})(2.73^0C)$

q = 856.674 J

Total heat lost by iron metal is the sum of heat gained by water and calorimeter.

So, heat gained by calorimeter = heat lost by iron metal - geat gained by water

heat gained by calorimeter = 1901.42 J - 856.674 J = 1044.746 J

Change in temperature for calrimeter is same as for water that is 2.73 degree C

For calorimeter, $q=C.\Delta T$

$C=\frac{q}{\Delta T}$

$C=\frac{1044.746J}{2.73^0C}$

$C=\frac{382.69J}{0C}$

So, the heat capacity of calorimeter is $\frac{382.69J}{0C}$ .

4 0

3 years ago

Calcium is an element With an atomic number of 20. The most common atoms of calcium have a mass number of 40. But some Atoms of

GREYUIT [131]

Answer:

Calcium is an element With an atomic number of 20. The most common atoms of calcium have a mass number of 40. But some Atoms of calcium have a mass number of 44

What is meant but the tears atomic number

8 0

3 years ago

Determine the type of reaction: AgNO3 + Cu --> Cu(NO3)2 + Ag

vladimir2022 [97]

Answer:

b. single displacement

7 0

3 years ago