Chemical bonds are formed or broken. This is true of a chemical change, but not a physical change. A physical change is usually something that you can see, such as changing of shape or form or staying the same. However, because you cannot visibly see chemical bonds being formed or broken and because this would affect the chemical composition, it is not a physical change.

6 0

3 years ago

Which ecological relationship is best represented by this graph?

saw5 [17]

The answer would be 1

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3 years ago

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You have 26.7 mL of 0.061 mol/L aqueous potassium hydroxide (KOH(aq)) in a conical flask. In a burette

Natasha2012 [34]

Answer:

9.47 mL

Explanation:

The reaction that takes place is:

2KOH + H₂SO₄ → K₂SO₄ + 2H₂O

First we calculate how many KOH moles reacted, using the given concentration and volume of KOH solution:

0.061 mol/L = 0.061 mmol/mL

0.061 mmol/mL * 26.7 mL = 1.6287 mmol KOH

Then we convert KOH moles into H₂SO₄ moles, using the stoichiometric coefficients:

1.6287 mmol KOH * $\frac{1mmolH_2SO_4}{2mmolKOH}$ = 0.8144 mmol H₂SO₄

Finally we calculate the required volume of the H₂SO₄ solution, using the number of moles and given concentration:

0.8144 mmol ÷ 0.086 mmol/mL = 9.47 mL

5 0

3 years ago