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3 years ago

Which describes an asteroid? (select all that apply)

Chemistry

2 answers:

abruzzese [7]3 years ago

6 0

Answer:

I think the second and third? sorry if I'm wrong

Explanation:

IrinaK [193]3 years ago

6 0

Answer.) 3

It said describe and the third one describes it lemme know if I got it right or wrong. Have a nice day!

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A gaseous system undergoes a change in temperature and volume. What is the entropy change for a particle in this system if the f

deff fn [24]

Explanation:

Entropy means the amount of randomness present within the molecules of the body of a substance.

Relation between entropy and microstate is as follows.

S = $K_{b} \times ln \Omega$

where, S = entropy

$K_{b}$ = Boltzmann constant

$\Omega$ = number of microstates

This equation only holds good when the system is neither losing or gaining energy. And, in the given situation we assume that the system is neither gaining or losing energy.

Also, let us assume that $\Omega$ = 1, and $\Omega'$ = 0.833

Therefore, change in entropy will be calculated as follows.

$\Delta S = K_{b} \times ln \Omega' - K_{b} \times ln \Omega$

= $1.38 \times 10^{-23} \times ln(0.833) - 1.38 \times 10^{-23} \times \times ln(1)$

= $1.38 \times 10^{-23} \times (-0.182)$

= $-0.251 \times 10^{-23}$

or, = $-2.51 \times 10^{-24}$

Thus, we can conclude that the entropy change for a particle in the given system is $-2.51 \times 10^{-24}$ J/K particle.

8 0

3 years ago

What is the molar mass of magnesium carbonate, MgCO3? 52.314 g/mol 84.313 g/mol 96.771 g/mol 102.588 g/mol

Orlov [11]

Answer:

Molar mass of MgCO3 = 84.3 g/mol

Explanation:

What is the molar mass of magnesium carbonate.

Molar mass of a substance is defined as the mass of one mole of the substance expressed in grams hence its unit is gram per mole (g/mol)

MgCO3 is a compound and it's molar mass would be the sum of the molar masses of the elements that make up the compound. MgCO3 contains 1 atom of magnesium, one atom of carbon and 3 atoms of oxygen

Molar mass of Magnesium = 24.3g

Molar mass of Carbon =12g

Molar mass of Oxygen = 16g

Molar mass of MgCO3 will be

24.3 + 12 + 16×3

= 24.3 + 12 +48 = 84.3 g/mol

Molar mass of MgCO3 = 84.3 g/mol

7 0

3 years ago

The water cycle is the movement of water from Earth's surface to the atmosphere and back to Earth's surface. Why do many living

sesenic [268]

Many organisms need clean drinking water and we also need moisture in the air for us to stay hydrated

7 0

4 years ago

Give reason why mendeleev's definition of transition elements is no longer acceptable

hjlf

Mendeleev's periodic table

Dmitri Mendeleev

Like many scientists working at the end of the 19th-century the Russian chemist Dmitri Mendeleev (1834-1907) was looking for ways to organise the known elements. Mendeleev published his first periodic table of the elements in 1869.

Features of Mendeleev's tables

Mendeleev arranged the elements in order of increasing relative atomic mass. When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend. He then arranged the elements by putting those with similar properties below each other into groups. To make his classification work Mendeleev made a few changes to his order:

he left gaps for yet to be discovered elements
he switched the order of a few elements to keep the groups consistent

5 0

3 years ago

Explain the need of the term avarage atomic mass

vodomira [7]

Answer:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.

Hope this helps :)

4 0

3 years ago