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Pepsi [2]
3 years ago
5

Which of the following changes can be reversed by changing the temperature: (a) dew condensing on a leaf; (b) an egg turning har

d when it is boiled; (c) ice cream melting; (d) a spoonful of batter cooking on a hot griddle?
Chemistry
1 answer:
oksano4ka [1.4K]3 years ago
3 0

Answer:

(a) dew condensing on a leaf

(c) ice cream melting

Explanation:

The process which can be reversed by changing the temperature , i.e. , by increasing or decreasing the temperature , is called the <u>reversible process</u> .

From the question ,  

  • dew condensing on a leaf is a reversible process ,  

As the water on the leaf can be changed to gaseous state by increasing the temperature .  

The process of condensation and evaporation are reversible of each other .

  • Ice cream melting

The melted ice cream can be solidified again by reducing its temperature , hence , it is a reversible process .

  • an egg turning hard when boiled and the batter cooking on a hot griddle

They both are irreversible process , and by changing the temperature , we can not get back the original substance .

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A scientist has two samples of gas: The first sample contains one mole of argon atoms and has a mass of 39.948 g; the second sam
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There are 6.022 × 10²³ atoms in 39.948 g of argon and 4.0026 g of helium.

Explanation:

39.945 g/mole is the molar mass of argon so 39.948 g of argon are equal to 1 mole of argon.

4.0026 g/mole is the molar mass of helium so 4.0026 g of helium are equal to 1 mole of helium.

We know that Avogadro's number tell us the number of particles in 1 mole of substance which is 6.022 × 10²³.

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3 years ago
Find the equation of directrix of the parabola is given by 64x equals to -ySquare ​
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Answer:

Given equation of parabola is

and

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On differentiating both sides of equation (i), we get

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dx

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Also, slope of the given line is −

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∴−

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=

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From equation (i), (−24)

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∴ the required point is (9,−24)

Explanation:

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