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3 years ago

Which equation shows a physical change?

2 answers:

7 0

H2O(g) --> H2O(s)

This is the change of phase from gas to solid, which is a physical change.

The other equations correspond to chemical changes given that the origin subtances are forming different substances

ludmilkaskok [199]3 years ago

7 0

<u>Answer:</u> The correct equation is $H_2O(g)\rightarrow H_2O(s)$

<u>Explanation:</u>

A physical change is defined as the change in which there is change in shape and size of the object and no change in the chemical composition of the substance. In this process, no new substance gets formed.

A chemical change is defined as the change in which chemical composition of the substance gets changed and new substance gets formed.

From the given options:

In first three options, new substances are getting formed and hence they are considered as a chemical change.

Only in last option, there is change in the physical state of matter that is change from gaseous state to solid state. No new substance is getting formed.

Hence, the correct equation is $H_2O(g)\rightarrow H_2O(s)$

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2 years ago

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Answer:

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2 years ago

The concentration of a biomolecule inside a rod-shaped prokaryotic cell is 0.0029 m. calculate the number of molecules inside th

bagirrra123 [75]

Molarity is expressed as:
Molarity = moles / liter

Given that the cell is rod-shaped, its volume is calculated using the formula for a cylinder's volume:

V = πr²L
V = π * (0.6)² * 4.9
V = 5.54 μm³

1 Liter = 10³ mm³
1 mm = 10³ μm
1 mm³ = 10⁹ μm³
1 liter = 10¹² μm³

So the volume in liters is:
5.54 x 10⁻¹² L

Moles = molarity * liters
Moles = 0.0029 * 5.54 x 10⁻¹²
Moles = 1.61 x 10⁻¹⁴

To get the number of molecules, we multiply the moles by Avagadro's number

Number of molecules = 1.61 x 10⁻¹⁴ * 6.02 x 10²³

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2 years ago

ASAP: The main difference between the gravitational force and electrical force is that

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Answer:

Electrical force can pull and push

Explanation:

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2 years ago

On combustion of 0.2 gm of organic compound gave 0.147g of CO2, 0.12g of H2O and 74.6 ml of nitrogen gas at STP. Find emperical

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Answer:

0.2 is conpound Co2 STP.

Explanation:

on combustion of 0.2 gm of organic compound gave 0.147g of CO2, 0.12g of H2O and 74.6 ml of nitrogen gas at STP. Find emperical formula of compound.?

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2 years ago