Why is making sand from glass a chemical change?

1 answer:

4 0

Well research shows that it's not technically a chemical change. you need to find out whether you are looking for silica or to use glass changes on a molecular level when heated or if it's melted into another form (physical change). It appears that to make glass you simply melt silica into the resulting product, which is glass. there is not a chemical change or molecular change. Therefore, making glass from sand is a physical, not a chemical change.

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7. What is the molarity of the nitrate ion that is found in a solution made by dissolving 6.25g

tekilochka [14]

Answer:

0.271 M NO₃⁻

Explanation:

To find the molarity of the nitrate ion (NO₃⁻), you need to (1) convert grams to moles (via molar mass), then (2) convert moles Al(NO₃)₃ to moles NO₃⁻, then (3) convert mL to L, and then (4) calculate the molarity. When (Al(NO₃)₃) dissolves in water, it dissociates into 3 nitrate ions. The final answer should have 3 sig figs.

(Steps 1 + 2)

Molar Mass (Al(NO₃)₃): 26.982 g/mol + 3(14.007 g/mol) + 9(15.998 g/mol)

Molar Mass (Al(NO₃)₃): 212.985 g/mol

1 Al(NO₃)₃ = 1 Al³⁺ and 3 NO₃⁻

6.25 g Al(NO₃)₃ 1 mole 3 moles NO₃⁻
------------------------- x ----------------- x ----------------------- = 0.0880 moles NO₃⁻
212.985 g 1 mole Al(NO₃)₃

(Steps 3 + 4)

325.0 mL / 1,000 = 0.3250 L

Molarity = moles / volume

Molarity = 0.0880 moles / 0.3250 L

Molarity = 0.271 M

3 0

1 year ago

In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 j of energy. the produc

sladkih [1.3K]

It would be law of conservation.

7 0

4 years ago