1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ivanshal [37]
3 years ago
15

What is the definition for chemical change

Physics
2 answers:
katovenus [111]3 years ago
8 0
Chemical change<span> is any </span>change<span> that results in the formation of new </span>chemical<span> substances. At the molecular level, </span>chemical change <span>involves making or breaking of bonds between atoms.</span>
Leni [432]3 years ago
4 0
It is a change that results in a new chemical substance.
You might be interested in
A 2100-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 5.00 m before coming into contact w
aliya0001 [1]

Answer:

   f = 878,080 N

Explanation:

mass of pile driver (m) = 2100 kg

distance of pile driver to steel beam (s) = 5 m

depth of steel driven (d) = 12 cm = 0.12 m

acceleration due to gravity (g0 = 9.8 m/s^{2}

calculate the average force exerted on the pile driver by the beam.

  • from work done = force x distance
  • work done = change in potential energy of the pile driver
  • equating the two equations above we have

               force x distance = m x g x (s - d)

              f x 0.12 = 2100 x 9.8 x (5- (-0.12))

              d = - 0.12 because the steel beam went down at we are taking its  

              initial position to be an origin point which is 0

              f = ( 2100 x 9.8 x (5- (-0.12)) ) ÷ 0.12

                   f = 878,080 N

4 0
3 years ago
A 24 liter tank contains ideal helium gas at 27 degrees C anda pressure of 22 atm. How many moles of gas are in the tank?
frozen [14]

Answer:

d)21.5 moles

Explanation:

Given that

L = 24 L

T = 27 °C = 300 K

P = 22 atm

We know that ideal gas equation

P V = n R T

P=Pressure ,V= Volume ,n=Moles ,R=Universal gas constant ,T=Temperature

Now by putting the values

22 x 24 = n x 0.08206 x 300

n= 21.447 moles

n= 21.5 moles

Therefore the number of moles will be 21.5 moles.

The answer is "d".

5 0
3 years ago
how much chemical energy must be supplied to a car engine if we want it to produce 5000J of kinetic energy and it is 45% efficie
vagabundo [1.1K]

Here i state the conservation of energy rule and use that to justify my answer. I showed how to manipulate percentages to get the final answer of 11000J (2sf). Hope I'm right xx

3 0
3 years ago
Why does the sound of a person’s voice sound different underwater than when they are speaking in air?
Tems11 [23]
Sound waves actually travel much faster in water than air, but words and the direction of the noise are distorted.
3 0
2 years ago
Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column.
zheka24 [161]

Answer:

1. Molecular cloud

2. Close binary

3. Brown dwarf

4. Protostellar wind

5. Thermal pressure

6. Protostellar disk

7. Jet

8. Degeneracy pressure

Explanation:

1. The Sun formed, probably along with other stars, within a large molecular cloud.

2. A Close binary consists of two stars that orbit each other every few days.

3. A Brown dwarf is a "star" so small in mass that its core never gets hot enough to sustain nuclear fusion reactions.

4. Most of the gas remaining from the process of star formation is swept into interstellar space by a protostellar wind.

5. As a protostar's internal temperature increases, its growing thermal pressure helps slow its contraction due to gravity.

6. Planets may form within the protostellar disk that surrounds a forming star.

7. Mass can be lost through a jet of material ejected along a protostar's axis of rotation.

8. A "star" with mass below 0.08 solar mass has its gravitational contraction halted by degeneracy pressure.

8 0
3 years ago
Other questions:
  • Which of the following has the greatest density?
    5·1 answer
  • Explain it with method....
    5·2 answers
  • PLEASE HELP!! 13 POINTS! SCIENCE!
    5·2 answers
  • Which are descriptions of gravity on Earth? Check all that apply.
    5·2 answers
  • Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 2.4
    11·1 answer
  • The coefficient of linear expansion of copper is 17 x 10^-6 K-1. A block of copper 30 cm wide, 45 cm long, and 10 cm thick is he
    8·1 answer
  • Is it possible to accelerate and not speed up or slow down?
    9·1 answer
  • HELP URGENT WILL GIVE BRAINLIEST
    5·1 answer
  • A disk-shaped space station 125 m in diameter spins at a constant angular velocity. If the acceleration of a point on the rim of
    5·1 answer
  • If a bender can be used to bend 3/4-inch rmc, then it can also be used to bend__________emt.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!