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andrezito [222]
3 years ago
7

A student dips a strip of metal into a liquid. Which is evidence that only a physical change has occurred? The metal bends more

easily. The metal changes color. The metal gives off light. The metal gives off heat.
Chemistry
2 answers:
Kazeer [188]3 years ago
7 0

Answer: Option (a) is the correct answer.

Explanation:

A change which brings no chemical change in composition of the substance is known as a physical change.

For example, bending of metal strip is a physical change as it does not change the chemical composition of substance.  

Whereas metal changes color, metal gives off light, and metal gives off heat are all chemical changes.

Thus, we can conclude that out of the given options, the metal bends more easily is evidence that only a physical change has occurred.

bixtya [17]3 years ago
4 0
The metal bends more easily is the correct answer all the others are cause via chemical reactions
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Calculate the volume (liters) of solution that can be prepared from 180. grams of K2Cr2O7 for a 0.200M solution.
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Answer:

The volume of the solution is 0.305 liters.

Explanation:

Molar mass is the amount of mass that a substance contains in one mole. The molar mass of K₂Cr₂O₇ is 294 g / mole. Then you can apply the following rule of three: if by definition of molar mass 294 grams of the compound are contained in 1 mole, 180 grams are contained in how many moles?

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Molarity is a measure of the concentration of a substance that is defined as the number of moles contained in a certain volume. So, the molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

molarity=\frac{number of moles of solute}{volume}

Molarity is expressed in units \frac{moles}{liter}.

In this case:

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Replacing in the definition of molarity:

2 M=\frac{0.61 moles}{volume}

Solving:

volume=\frac{0.61 moles}{2 M}

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<u><em>The volume of the solution is 0.305 liters.</em></u>

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