Physics, 06.10.2019 23:30 shayla3613

Which best describes why a chemical change is different than a physical change?

a. a chemical change results in a different state of matter, and a physical change results in a new substance being formed.

b. a chemical change is used to identify characteristics of a substance, and a physical change identifies the behavior of a substance when in a reaction.

c. a chemical change results in a new substance being formed, whereas a physical change will result in a different state of matter.

d. a chemical change is used by scientists to create new substances, and a physical change happens naturally.

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Answer from: attic

C Because a chemical change changes the substance into a new one as a physical change is like cutting a piece of paper
its still paper

Answer from: KarateKat

C. A chemical change results in a new substance being formed, whereas a physical change will result in a different state of matter.

Answer from: Quest

This is what i found on google “kinetic energy. energy is transferred from one object to another when a reaction takes place. energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. this energy would be in the form of motion, with the person lifting the blue ball to a higher level.” i hope this you

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Which best describes why a chemical change is different than a physical change?

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