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attashe74 [19]
3 years ago
12

What is a valency according to chemistry​

Chemistry
1 answer:
Bond [772]3 years ago
4 0

Answer:

Valency is the measure of the combining power of an element

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a student balanced the chemical equation for the reaction of magnesium with oxygen by writing Mg + O2 ----> MgO2. What is wro
egoroff_w [7]

Answer:

Explanation:

Magnesium when it oxidizes has a valence of 2.

Oxygen, when it mixes with something, has a valence of - 2

So Mg and O2 will form something, but what? The answer is MgO

Mg + O2 ===> MgO

To balance this equation, you need 2 Magnesiums on the right and 2 Oxygens also on the right. The left will need a  two Magnesiums.

The balanced equation will be

2Mg + O2 ====> 2MgO

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4 years ago
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Answer:

H

Explanation:

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3 years ago
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Which level of organization refers to all the types of environments in which organisms can be found?
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B , Biosphere is a special shell of the Earth inhabited by living organisms
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If I have 12.0 volume of gas at pressure of 1.10 and temperature of 200k, what is the number of moles? (R=8314)
arsen [322]

Answer:

7.94 x 10^6 mol

Explanation:

PV=nRT

n=(PV)/(RT)

n=(1.10*12.0)/(8314*200)

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5 0
3 years ago
A car starts from rest and uniformly accelerates to a speed of 30 mi/h in 6 s. The car moves north the entire time. Which option
kirill115 [55]

Answer:

acceleration: 5 mi/h/s north

Explanation:

A quantity can be either vector quantity or scalar quantity, a vector  quantity is a quantity with both magnitude and direction while a scalar quantity has magnitude only.

Examples of vector quantities include; velocity, acceleration, displacement , etc.

Acceleration is the rate of change of an object's velocity per unit of time. It is given by the formula; Velocity/time

Therefore in this case; a = 30 mi/h /6 s

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Therefore;

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4 years ago
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