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4 years ago

What is the electron configuration of an electrically neutral atom of magnesium?

1 answer:

3 0

The electron configuration of an atom can be determined by identifying first the right order of the electron shells. The atomic number of Magnesium is 12 so we expect the electrons also sum up to 12. The condensed electron configuration is Ne 3s2. The complete configuration is 1s2 2s2 2p6 3s2.

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When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water. Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O

Anit [1.1K]

Answer:

The law of conservation of mass states that mass is neither created nor destroyed but the mass of the system must remain constant over time. The total number of atoms in the reactants is equal to the total number of atoms in the product. Therefore, this chemical equation shows that energy is conserved and demonstrates the law of conservation of mass.

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3 years ago

Lithium reacts spontaneously with bromine to produce lithium bromide. Write the balanced chemical equation for the reaction. (Us

nekit [7.7K]

Answer:
___________________________________________________

" 2 Li + Br2<span> ----> 2 LiBr " .
___________________________________________________</span>

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3 years ago

Which of these has NOT been used as an astronomical observatory?

allsm [11]

Answer: Poing Reyes

Explanation: the other options are incorrect as they have been used as astronomical observatory

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4 years ago

Wood has a density of 0.531 g/cm3. What is the volume of 44 grams of wood?

Sunny_sXe [5.5K]

Answer:

<h3>The answer is 82.86 cm³</h3>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass of wood = 44 g

density = 0.531 g/cm³

It's volume is

$volume = \frac{44}{0.531} \\ = 82.86252354...$

We have the final answer as

Hope this helps you

3 0

3 years ago

What pressure will be necessary to compress 2 liters of a gas at 1 atm to a volume of 0.05 liters if the temperature remains con

PtichkaEL [24]

<h3>Answer:</h3>

40 atm

<h3>Explanation:</h3>

According to Boyle's law, the pressure and the volume of a fixed mass of a gas are inversely proportional at constant absolute temperature.
That is; $P\alpha \frac{1}{V}$

At varying pressure and volume,

P1V1 =P2V2

In this case,

Initial volume, V1 = 2 L

Initial pressure, P1 = 1 atm

New volume, V2 = 0.05 L

We are required to calculate the new pressure,

Rearranging the formula;

P2 = P1V1 ÷ V2

= (1 atm × 2L) ÷ 0.05 L

= 40 atm

Therefore, the pressure required is 40 atm

8 0

3 years ago