All categories

3 years ago

Distinguish between physical and chemical changes. Include examples in your explanations.

Physics

1 answer:

hram777 [196]3 years ago

6 0

Answer:

<u>Chemical changes</u> are recognized when a substance changes its properties permanently and it cannot be the same substance as before.

Instead the<u> physical changes</u><u> </u>implies that if you can return to the same substance through a reverse process.

Explanation:

A chemical change is, by example, a combustion, if a sheet of paper burns, its result is ashes, the ashes cannot go back to being a sheet of paper because its properties changed, heat energy was generated that changed matter permanently.

A physical change, by example, is that of freezing water, the water becomes ice, but this can easily become water again if the temperature is increased, its properties do not change and the chemistry of the substance does not change.

You might be interested in

Show explicitly that ▽ . B-0 near a long straight wire carrying a current I. HINT: you may use Cartesian coordinates, but anothe

aivan3 [116]

Answer:

$\bigtriangledown.B=0$ is proved.

Explanation:

The magnetic field in the long current carrying wire is,

$B=\frac{\mu_{0}I }{2\pi r } \phi$

Here, I is the current, B is the magnetic field.

Now, by using cylindrical coordinates for the divergence of B.

$\bigtriangledown.B=\frac{1}{s} \frac{d}{d\phi} B$

Put the value of B in above equation.

$\bigtriangledown.B=\frac{1}{s} \frac{d}{d\phi}(\frac{\mu_{0}I }{2\pi r } \phi)\\\bigtriangledown.B=0$

Hence, it is prove that for a long current I carrying wire magnetic field divergence that is $\bigtriangledown.B=0$ .

7 0

3 years ago

4. A 1,000-kilogram satellite completes a uniform circular orbit of radius 8.0 x 10 meters as

lesantik [10]

Answer:

Zero

Explanation:

The work done by a force on an object is given by:

$W=Fd cos \theta$

where

F is the magnitude of the force

d is the displacement of the object

$\theta$ is the angle between the direction of the force and the displacement of the object

In this situation, the force is the force of gravity acting on the satellite. This force always points towards the centre of the trajectory, so it is always perpendicular to the direction of motion of the satellite (since the orbit is circular), so $\theta=90^{\circ}$ and $cos \theta =0$ . Therefore, the work done by gravity is also zero.

5 0

3 years ago

What is the difference between cytology and histology

bulgar [2K]

Explanation:

what is the difference between cytology and histology

Histology involves the study of tissue and Cytology involves the study of cells, both of which are derived from various organs of the human body. The Histology laboratory is responsible for the preparation of tissue for diagnosis by Pathologists.

8 0

3 years ago

Do you agree or disagree that folk dance forms can be outside their original formmeaningful s

My name is Ann [436]

I disagree that folk dance forms can be outside their original meaningful form in this scenario.

<h3>What is Folk dance?</h3>

This is the type of dance which is unique to a particular set of people and helps celebrate their culture.

This dance is a ritualistic entertainment which is done in different type of gatherings such as ceremonies etc which is why it isn't outside their original meaningful form.

Read more about Folk dance here brainly.com/question/18269425

7 0

3 years ago

If two different substances, with the same mass (1 gram) absorb the same amount of energy, which of the following can be predict

Makovka662 [10]

If two different substances, with the same mass (1 gram) absorb the same amount of energy "the temperature of the substance with the lower specific heat will increase more than the one with a higher specific heat".

Option B

<u>Explanation:</u>

The thermodynamic function that specifies the amount of heat needed by one degree of temperature for a single unit of mass of a material to be elevated is understood as "Specific heat". Depending on the extent to which they absorb heat, various levels of specific heat values are seen for the materials.

The heat transferred relies on three factors: temperature change, weight of the device, material change and stage of the material. The average temperature of the molecules increases as the material heats up, so when they collide they are more likely to contribute enough energy to cause rotation and vibration to happen as the energy moves to a higher state.

8 0

3 years ago