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3 years ago

Which changes involve forming or breaking chemical bonds?

Physics

1 answer:

Ivahew [28]3 years ago

3 0

Answer: burning and melting

Combustion (burning of molecules) is an exothermic oxidation-reduction reaction. When the combustion is intense, it results in a flame or an explosion (deflagration or detonation if the flame front exceeds the speed of sound).

This chemical reaction is a recombination of molecules. It goes through an intermediate step during which the molecules are "destructured" but not yet recombined; these are called radicals and are very reactive. In the case of combustion, the radicals are created by chemical bond breakage due to thermal energy, and they will be able to act on the molecules of the product (releasing other radicals) and thus generating a chain reaction that will continue as long as the following two conditions are met: presence of fuel and oxidizer.

Digestion is a food processing that is ingested into smaller particles that can or can not be assimilated by the body.

Explanation:

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Define the following:

Andrej [43]

Answer:

Variable- not consistent or having a fixed pattern; liable to change

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Control- a group or individual used as a standard of comparison for checking the results of a survey or experiment

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Explanation:

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3 years ago

A student measure the length of a laboratory bench with a meter ruler. Which of the following values is the most approbriate way

PtichkaEL [24]

Answer:

Well a meter stick has increments of a centimeter, and since 1 cm=0.01m he should record it as 4.02m(b)

Explanation:

8 0

3 years ago

Consider a turntable to be a circular disk of moment of inertia It rotating at a constant angular velocity ωi around an axis thr

Rom4ik [11]

Answer:

Note: Angular momentum is always conserved in a collision.

The initial angular momentum of the system is

L = ( It ) ( ωi )

where It = moment of inertia of the rotating circular disc,

ωi = angular velocity of the rotating circular disc

The final angular momentum is

L = ( It + Ir ) ( ωf )

where ωf is the final angular velocity of the system.

Since the two angular momenta are equal, we see that

( It ) ( ωi ) = ( It + Ir ) ( ωf )

so making ωf the subject of the formula

ωf = [ ( It ) / ( It + Ir ) ] ωi

Explanation:

7 0

3 years ago

Divers in Acapulco dive from a cliff that is 65 m high. If the rocks

Alex777 [14]

Answer:

Cool question! First step is to find the time taken to fall

, then to find the horizontal velocity needed to cover

in that time. In this case the answer is

7.0

−

Explanation:

This is a less typical projectile motion question, but it's still projectile motion. This means the horizontal and vertical directions can be considered separately. We assume that the initial vertical velocity,

−

, and we are trying to find the required initial horizontal velocity,

To find the time taken to fall

Since

, we can rearrange this to:

√

⋅

9.8

3.41

The horizontal velocity will be constant (ignoring air resistance), so to cover

3.41

will be given by:

→

3.41

7.0

−

Answer link

5 0

2 years ago

. Suppose an electron is chasing a proton up this page when suddenly a magnetic field pointing into the page is applied. What wo

irina1246 [14]

The proton and electron experience forces to the left and right of the page, the particles would separate to the left and right respectively after the magnetic field is applied.

To know what would happen to each particle when a magnetic field pointing in the direction of the page is applied, we need to know the direction of the force acting on the particles due to this magnetic field according to fleming's left hand rule

<h3>What is Fleming's left hand rule?</h3>

This states that when the thumb, the middle-finger and fore-finger of the left-hand are held at right angles to each other, the magnetic field points in the direction of the fore-finger, the current (or direction of charge) points in the direction of the middle finger and the force on the conductor or charge points in the direction of the thumb.

<h3>What is the direction of force on the proton?</h3>

Since the direction of the proton is up the page and the direction of the magnetic field is into the page, the direction of the force according to fleming's left hand rule is to the left of the page.

<h3>What is the direction of force on the electron?</h3>

Since the direction of the electron is up the page (it is in the direction of the conventional current or positive charge in the other direction) and the direction of the magnetic field is into the page, the direction of the force according to fleming's left hand rule is to the right of the page.

Since both the proton and electron experience forces to the left and right of the page, the particles would separate to the left and right respectively after the magnetic field is applied.

Learn more about magnetic field here:

brainly.com/question/26051825

8 0

2 years ago