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ki77a [65]
3 years ago
5

Which product formed when MgO and H2O react together?

Chemistry
2 answers:
SIZIF [17.4K]3 years ago
5 0
<span>MgO + H</span>₂<span>O = Mg(OH)</span>₂


Mg(OH)₂ = <span>Magnesium hydroxide
</span>
hope this helps!

seropon [69]3 years ago
4 0
When MgO and H2O react they form Magnesium Hydroxide Mg(OH)2
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Answer:

Q = 96.6 j

Explanation:

Given data:

Heat required = ?

Initial temperature = 19°C

Final temperature = 33°C

Mass of disc = 3.0 g

Specific heat capacity = 2.3 J/g.°C

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 33°C - 19°C

ΔT = 14°C

Q = 3.0 g×2.3 J/g.°C × 14°C

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3 0
2 years ago
The four lines observed in the visible emission spectrum of hydrogen tell us that: a. We could observe more lines if we had a st
Aliun [14]

Answer:

c. Only certain energies are allowed for the electron in a hydrogen atom

Explanation:

Emission spectrum are produced when the excited electron in a atom release the energy in the form of photons to come to ground state. These photons are of different wavelengths depending on the excitation state of emitting electron or transition of electron. These electromagnetic radiation are observed through prism to produce the spectrum.

As the name indicates this spectrum is produced by emission of energy. Although the electron can be excited by different methods such as by heating but the key point is that electrons in hydrogen atom will emit the photons of same energy which they absorb and each electron can absorb only certain type of energy. So four lines were observed in the visible spectrum of hydrogen because only certain energies are observed for hydrogen atom.

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3 years ago
When scientists create a representation of a complex process, they are
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Answer:

d making models.

Explanation:

When scientists create a representation of a complex process, they are inferring that they are making models.

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3 years ago
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Fofino [41]

Answer: What do you need help with?

3 0
2 years ago
Read 2 more answers
A,B and C have the following solubilities in 100 mL of water at 25°C, respectively: 15g, 35 g and 65 g. If 75 g of each are adde
Pani-rosa [81]

Answer:

<u>Only C can dissolve in water because its solubility is greater than 0.375 g/mL</u>

<u>C dissolves completely</u>

22.5 g of A remain undissolved in 100 mL of water

2.5 g of B remain undissolved  in 100 mL of water

<u></u>

Explanation:

Solubility : The amount of salt that can be dissolved in a given volume of solvent at a particular temperature .

Solubility = \frac{mass}{volume}

For each salt the solubility of 75 g in  200 mL water is

Solubility = \frac{75}{200}

0.375 g/mL

This mean 1 ml of water has 0.375 g of A , B and C

<u>100 mL of water contain = 37.5 g of each salt A , B,C</u>

In the question , the solubility of A , B and C in 100 are given as :

A =  15 g : It means maximum 15 g of A can dissolve in 100 mL

Solubility = \frac{15}{100} = 0.15 g/mL

B = 35 g  : It means maximum 35 g of B can dissolve in 100 mL

Solubility = \frac{35}{100} = 0.35 g/mL

C = 65 g : It means maximum 65 g of A can dissolve in 100 mL

Solubility = \frac{65}{100} = 0.65 g/mL

Since ,Solubility of A and B is less than 0.375 g/mL

<u>So A and B  can't dissolve in water at 25°C</u>

A is excess by 37.5 - 15 = 22.5 g

B is in excess by 37.5 - 35 = 2.5 g

<u>Hence 22.5 g of A remain undissolved</u>

<u>Hence  2.5 g of B remain undissolved </u>

<u>Only C can dissolve in water because its solubility is greater than 0.375 g/mL</u>

<u></u>

6 0
3 years ago
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