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2 years ago

Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as

2 answers:

8 0

<span>Answer: a mixture.

</span><span>Justification:</span>
<span /><span>
</span><span>1) Pure substances have a definite chemical formula: the same kind of atoms with the same fixed ratios and chemical bonds. Therefore, the percents of each element do not varye.
</span>
<span /><span /><span>
2) Elements and compounds are pure substaces. For example, Fe, Mg, Ti, are elements, and CO₂, CO, H₂CO₃ are compounds. Each of them will have always the same kind of atoms, in the same ratio and with the same chemcial bonds. Therefore the percents of the elements do not varye.
</span><span />

<span>3) Mixtures are formed by the physical combination (not chemical bonds) of different elements or compounds in variable proportions. As indicated, this describes the material bronze, in virtue of the variation of its composition. Other examples of mixtures are solutions (like brines), air, ocean water, and milk: different brines, different oceans and different milk have different contents of elements or compounds.
</span><span>
</span>

san4es73 [151]2 years ago

4 0

Answer:

it is a mixture

Explanation:

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kotykmax [81]

The best ansewer would be a)sediment

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2 years ago

How many moles of chromium(iii) nitrate are produced when chromium reacts with 0.85 moles of lead(iv) nitrate to produce chromiu

Alexxandr [17]

The moles of chromium (iii) nitrate produced is calculated as follows

write the equation for reaction

3 Pb(NO3)2 + 2 Cr = 2 Cr(NO3)3 + 3 Pb

by use of mole ratio between Pb(NO3)2 to Cr(NO3)3 which is 3 : 2 the moles of Cr(NO3)3 is therefore
= 0.85 x2 /3 = 0.57 moles

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2 years ago

Identify Earth’s neighbors in the solar system by choosing the correct answer. The are bodies of rock or gas that are named for

SpyIntel [72]

Answer: The are bodies of rock or gas that are named for ancient gods.

Explanation:

Earth is the THIRD planet in the solar system. It support life of all living organisms.

VENUS is the second planet in our solar system. It is named after the Roman goddess of love and beauty.

MARS is the fourth planet in our solar system. It is named after the Roman goddess of war.

Thus, Venus and Mars, are EARTH NEIGHBORS

6 0

2 years ago

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Determine the total number of moles of ions in 40.0 ml of a 0.345 m solution of the strong electrolyte mgcl2

Sedbober [7]

A strong electrolyte like MgCl2 dissociates completely as per the following reaction:

$MgCl_2 ----\ \textgreater \ Mg^{2+} + 2Cl^-$

As you can see, from 1 molecule of MgCl2 produces 3 ions on dissociation.
So, 1 mole of MgCl2 produces 3 moles of ions.

Now, Moles of MgCl2 = Volume x Molarity

= 0.04 x 0.345 [Change volume to Litres]
= 0.0138 moles

Now, total moles of ions = 0.0138 x 3 = 0.0414

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2 years ago

The molecular mass of air, at standard pressure and temperature, is approximately 28.97 g/mol. Calculate the mass of 3.33 moles

poizon [28]

<h3>Answer:</h3>

Mass = 96.47 g

<h3>Solution:</h3>

Data Given:

M.Mass = 28.97 g.mol⁻¹

Moles = 3.33 mol

Mass = ??

Formula Used:

Moles = Mass ÷ M.Mass

Solving for Mass,

Mass = Moles × M.Mass

Putting values,

Mass = 3.33 mol × 28.97 g.mol⁻¹

Mass = 96.4701 g

Rounding to four significant numbers,

Mass = 96.47 g

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1 year ago

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