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fredd [130]
3 years ago
7

When magnesium burns in air, a white flaky ash of magnesium oxide is produced. Is the mass of magnesium oxide greater than, less

than, or the same as the original piece of magnesium?
Chemistry
2 answers:
Norma-Jean [14]3 years ago
4 0

Answer:

the mass of magnesium oxide will be less than the orginal peice of magnesium

Explanation:

because the magnesium burns to ashes in the presense of air

Alexeev081 [22]3 years ago
3 0

<u>Answer:</u> The mass of magnesium oxide is greater than the mass of original piece of magnesium.

<u>Explanation:</u>

When magnesium burns in air to form a white flaky ash of magnesium oxide, it is undergoing a combination reaction.

A combination reaction is defined as the chemical reaction in which two lighter substances combine to form a single larger substance.

A+B\rightarrow AB

The chemical equation for the formation of magnesium oxide follows:

2Mg+O_2\rightarrow 2MgO

Hence, the mass of magnesium oxide is greater than the mass of original piece of magnesium.

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8 0
3 years ago
If there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant
Vanyuwa [196]
<h3>Answer:</h3>

              Excess Reagent =  NBr₃

<h3>Solution:</h3>

The Balance Chemical Equation for the reaction of NBr₃ and NaOH is as follow,

                       2 NBr₃ + 3 NaOH   →   N₂ + 3 NaBr + 3 HBrO

Calculating the Limiting Reagent,

According to Balance equation,

               2 moles NBr₃ reacts with  =  3 moles of NaOH

So,

           40 moles of NBr₃ will react with  =  X moles of NaOH

Solving for X,

                       X  =  (40 mol × 3 mol) ÷ 2 mol

                       X  =  60 mol of NaOH

It means 40 moles of NBr₃ requires 60 moles of NaOH, while we are provided with 48 moles of NaOH which is Limited. Therefore, NaOH is the limiting reagent and will control the yield of products. And NBr₃ is in excess as some of it is left due to complete consumption of NaOH.

6 0
3 years ago
When sodium is put in water, the metal floats on the surface and reacts to form sodium
mrs_skeptik [129]

Answer: Sodium also floats on the surface, but enough heat is given off to melt the sodium (sodium has a lower melting point than lithium and the reaction produces heat faster) and it melts almost at once to form a small silvery ball that dashes around the surface.

Explanation:

8 0
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"Caesium" is the strongest reducing agent in Periodic table.

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8 0
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The reactant is Mercury (II) Oxide while the products are Mercury and Oxygen separately.

This is because the reactants are typically always on the left side of the yields symbol. In this decomposition reaction, it would still be the same as at the end of the reaction, there were to products produced: Mercury and Oxygen.

Products tend to always be on the right side of the yields symbol, they're what comes out of a reaction no matter what type.

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