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3 years ago

13

Which statement correctly describes a physical change?

1 answer:

MArishka [77]3 years ago

4 0

Answer: Option (b) is the correct answer.

Explanation:

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

For example, melting of ice is a physical change as there occurs change in phase from solid state to liquid state of water. Whereas the structure of water remains the same.

Therefore, we can conclude that the statement which describes a physical change is that it may involve a change in phase but does not involve a change in the molecular structure.

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What element has 2 electrons in the 4s sub level?

ruslelena [56]

is the Calcium because the calcium in group two which group two has 2 electron and also calcium and Potassium 4s sub level group potassium has 1 electron. :)

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3 years ago

The sample concentration was measured at 50mg/ml. The loading concentration needs to be 10mg/ml. The final volume needs to be 25

Svet_ta [14]

Answer:

a) $V_1=5ul$

b) $v=20ul$

Explanation:

From the question we are told that:

initial Concentration $C_1=50mg/ml$

Final Concentration $C_2=10mg/ml$

Final volume needs $V_2 =25ul$

Generally the equation for Volume is mathematically given by

$C_1V_1=C_2V_2$

$V_1=\frac{C_1V_1}{C_2}$

$V_1=\frac{10*25}{50}$

$V_1=5ul$

Therefore

The volume of buffer needed is

$v=V_2-V_1\\\\v=25-5$

$v=20ul$

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3 years ago

A sample of gas has a volume of 100. L at 17 °C and 800. torr. To what temperature must the gas be cooled in order for its volum

Romashka [77]

Answer:

108.81 K

Explanation:

First convert 17 °C to Kelvin:

17 + 273.16 = 290.16 K

Assuming ideal behaviour, we can solve this problem by using the<em> combined gas law</em>, which states that at constant composition:

P₁V₁T₂=P₂V₂T₁

Where in this case:

P₁ = 800 torr

V₁ = 100 L

T₂ = ?

P₂ = 600 torr

V₂ = 50 L

T₁ = 290.16 K

We <u>input the data</u>:

800 torr * 100 L * T₂ = 600 torr * 50 L * 290.16 K

And <u>solve for T₂</u>:

T₂ = 108.81 K

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Answer:

B.)

Explanation:

Anwser is b yw c:

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A scientist that studies the weather is called a meteorologist.
Hope this helped!

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