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Liula [17]
3 years ago
13

Which process is a physical change? iron rusting milk turning into curd water boiling paper burning hard water stains pipes?

Chemistry
2 answers:
Elodia [21]3 years ago
6 0
Iron rusting over is a physical change.
Len [333]3 years ago
5 0

Answer: Option (c) is the correct answer.

Explanation:

A change that causes no change in chemical composition of a substance is known as a physical change.

For example, boiling of water is a physical change as state of water is changing from liquid to vapors.

On the other hand, a change that causes a change in chemical composition of a substance is known as a chemical change.

For example, rusting of iron, churning of milk into curd, burning of paper, stains of hard water on pipes are all chemical changes.

Thus, we can conclude that water boiling process is a physical change.

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The density of lead is 11.4g/cm3. What volume, in ft3, would be occupied by 10.0 g of lead?
yawa3891 [41]

Answer:

3.10×10¯⁵ ft³.

Explanation:

The following data were obtained from the question:

Density (D) of lead = 11.4 g/cm³

Mass (m) of lead = 10 g

Volume (V) of lead =.?

Density (D) = mass (m) / Volume (V)

D = m/V

11.4 = 10 / V

Cross multiply

11.4 × V = 10

Divide both side by 11.4

V = 10 / 11.4

V = 0.877 cm³

Finally, we shall convert 0.877 cm³ to ft³. This can be obtained as follow:

1 cm³ = 3.531×10¯⁵ ft³

Therefore,

0.877 cm³ = 0.877 cm³ × 3.531×10¯⁵ ft³ /1 cm³

0.877 cm³ = 3.10×10¯⁵ ft³

Thus, 0.877 cm³ is equivalent to 3.10×10¯⁵ ft³.

Therefore, the volume of the lead in ft³ is 3.10×10¯⁵ ft³.

7 0
3 years ago
A 5.00 L sample of helium expands to 12.0 L at which point the
mina [271]

Answer:

1.73 atm

Explanation:

Given data:

Initial volume of helium = 5.00 L

Final volume of helium = 12.0 L

Final pressure = 0.720 atm

Initial pressure = ?

Solution:

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

P₁ × 5.00 L = 0.720 atm × 12.0 L

P₁ = 8.64 atm. L/5 L

P₁ = 1.73 atm

7 0
3 years ago
How many electrons should Nitrogen (N) have around its Lewis dot model?
Delvig [45]

Answer:

5

Explanation:

3 0
3 years ago
Mass<br> 16g<br> 1 cm<br> .5 cm<br> 2 cm
Rufina [12.5K]

Answer:

The answer will be 160 we have to just multiply it ok

8 0
3 years ago
According to "Black Hole Beginnings," what causes the end of a star?
Alisiya [41]

Answer:

when it gets so dense and heavy it implodes, and creates a black hole

Explanation:

7 0
3 years ago
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