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3241004551 [841]
3 years ago
12

Jewelry gold is usually mixed with other medals such as silver or platinum. It varies from 10K (10/24 gold) to 18K (18/24 gold).

Is jewelry an element, compound or mixture?
Chemistry
1 answer:
aniked [119]3 years ago
4 0

Answer:

Mixture

Explanation:

Jewelry is a Mixture. This is because of the variation in it's composition.

Elements

Elements are pure substances. The fact that jewelry gold is mixed with other medals means it is no longer a single entity, hence not an element.

Compound

Compound are substances that are bonded together with a fixed composition. This means the jewelry gold is not a compound

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If 34.5 g of Copper reacts with 70.2 g of silver nitrate, according to the following
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Answer:

44,55 can be produced.

Explanation:

First, we balanced the equation

1Cu + 2AgNO3 → 1Cu(NO3)2 + Ag

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mol Cu = \frac{34,5g}{63,55\frac{g}{mol} } = 0,543 mol\\

mol AgNO3 = \frac{70,2g}{169,87\frac{g}{mol} } = 0,413 mol\\

Now, we find the limiting reagent from the quantities of product that can be formed from each reagent

mol AgNO3= 0,543mol Cu . \frac{2 mol AgNo3}{1 mol Cu} = 1,086 mol

mol Cu= 0,413 mol AgNO3 . \frac{1 mol Cu}{2 mol AgNO3} = 0,206 mol

1,086 moles of AgNO3 is necessary for each mole of Cu since we have 0.413 moles of Ag(NO3), the nitrate is the limiting reagent

the value of the limiting reagent determines the amount of product that is generated

∴ 0,413 mol of Ag can be produced

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A sample of nitrogen gas is produced in a reaction and collected under water in a graduated cyliner. The temperature is 26.3 oC
Rudiy27

The mass of nitrogen collected is mathematically given as

M-N2=0.025gram

<h3>What is the mass of nitrogen collected?</h3>

Question Parameters:

A sample weighing 2.000g

the liberated NH3 is caught in  50ml pipeful  of H2SO4 (1.000ml   =  0.01860g Na2O).

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Pressure=745mmHg=745torr

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Generally, the equation for the ideal gas   is mathematically given as

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Therefore

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