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3 years ago

Magnesium oxide is a binary ionic compound. From its formula, MgO, how do you know that Mg is the metal?

Chemistry

2 answers:

Vlad [161]3 years ago

8 0

Magnesium is a metal on the periodic table

leva [86]3 years ago

6 0

<h2>Answer:</h2>

<u><em>According to formula, magnesium gives electron forming a cation which is the property of metals according to periodic table.</em></u>

<h3>Explanation:</h3>

Mg has a valency of two electrons which means it has two electron in the valence shell. It gives two electrons to an oxygen atom which becomes a anion.
They form two ionic bond forming MgO.
And the atoms of valency two are present in 2nd column which contains metals.
Hence from formula, it can be known that Mg is a metal.

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Please help me this is a quiz gde

wel

An not sure,, but maybe 24. don't take my word for it

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2 years ago

What type of reaction is: CaO + H2O -> Ca(OH)2? A. Combustion B. Synthesis C. Double Replacement D. Decomposition

12345 [234]

Answer:

The reaction is B. Synthesis

Explanation:

In the case of this reaction, it corresponds to a synthesis where 2 compounds (calcium oxide and water) are combined to form a new one (calcium hydroxide).

8 0

3 years ago

7. Suppose 1.01 g of iron (III) chloride is placed in a 10.00-mL volumetric flask with a bit of water in it. The flask is shaken

Nana76 [90]

<u>Answer:</u> The molarity of Iron (III) chloride is 0.622 M.

<u>Explanation:</u>

Molarity is defined as the number of moles present in one liter of solution. The equation used to calculate molarity of the solution is:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Or,

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Mass of iron (III) chloride = 1.01 g

Molar mass of iron (III) chloride = 162.2 g/mol

Volume of the solution = 10 mL

Putting values in above equation, we get:

$\text{Molarity of Iron (III) chloride}=\frac{1.01g\times 1000}{162.2g/mol\times 10mL}\\\\\text{Molarity of Iron (III) chloride}=0.622M$

Hence, the molarity of Iron (III) chloride is 0.622 M.

3 0

3 years ago

As an alternative energy source, nuclear energy is more harmful to the environment than a coal-fired power plant because it prod

mel-nik [20]

Answer:

False

Explanation:

It is coal-fired power plants that produce mercury, air pollution, and carbon dioxide.

However, nuclear energy produces radioactive waste that must be stored for many years before it can be safely disposed.

6 0

3 years ago

The amount of energy needed to heat 6.2 g of a substance from 50.0°C to 80.0°C is 27.4 J. What is the specific heat capacity of

taurus [48]

Answer:

The heat capacity for the sample is 0.913 J/°C

Explanation:

This is the formula for heat capacity that help us to solve this:

Q / (Final T° - Initial T°) = c . m

where m is mass and c, the specific heat of the substance

27.4 J / (80°C - 50°C) = c . 6.2 g

[27.4 J / (80°C - 50°C)] / 6.2 g = c

27.4 J / 30°C . 1/6.2g = c

0.147 J/g°C = c

Therefore, the heat capacity is 0.913 J/°C

7 0

3 years ago