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
Naddik [55]
3 years ago
11

Which activity is an example of a chemical change?

Physics
2 answers:
saul85 [17]3 years ago
5 0

C lighting a match is a chemical reaction


melomori [17]3 years ago
3 0

The answer is C because when the chemicals on the tip of a match are heated up from friction it ignites.

You might be interested in
Charge flows from low potential to high potential.<br> O True<br> or<br> O False
inn [45]

Answer:

False

Explanation:

Think of the electric potential in terms of potential energy. If you imagine a place with high elevation (A) and another one at sea level (B), a ball will roll from high potential to low potential (A-->B).

Everything in our universe wants to reach a lower state of energy if no external force is acted upon it. Every object tends to slow down (friction), a radioactive element dissipates energy (an unstable element releases energy to get to a stable state), water in the clouds comes down to the ground (rain experiencing difference in potential energy).

Electric potential is exactly the same, you just can't see it! It flows from higher voltage (which is a synonym for electric potential) to lower voltage.

8 0
2 years ago
. The penalties for a person's second DUI conviction include completion of __________ hours of DUI school.
Kobotan [32]
<span>The penalties for a person's second DUI conviction include completion of </span>21 hours of DUI school.


4 0
3 years ago
An 8.0 cm object is 40.0 cm from a concave mirror that has a focal length of 10.0 cm. Its image is 16.0 cm in front of the mirro
svet-max [94.6K]
 We can rearrange the mirror equation before plugging our values in. 
1/p = 1/f - 1/q. 
1/p = 1/10cm - 1/40cm
1/p = 4/40cm - 1/40cm = 3/40cm
40cm=3p  <-- cross multiplication
13.33cm = p

Now that we have the value of p, we can plug it into the magnification equation.

M=-16/13.33=1.2
1.2=h'/8cm
9.6=h'

So the height of the image produced by the mirror is 9.6cm.
6 0
3 years ago
I need a sentence for the word sandy soil
rusak2 [61]
One day, as I was walking, I found some sandy soil beside the road.
6 0
3 years ago
Read 2 more answers
A circular curve of radius 150 m is banked at an angle of 15 degrees. A 750-kg car negotiates the curve at 85.0 km/h without ski
Crazy boy [7]

Answer: a) 7.1 * 10^3 N; b) -880 N directed out of the curve.

Explanation: In order to solve this problem we have to use the Newton laws, then we have the following:

Pcos 15°-N=0

Psin15°-f= m*ac

from the first we obtain N, the normal force

N=750Kg*9.8* cos (15°)= 7.1 *10^3 N

Then to calculate the frictional force (f) we can use the second equation

f=P sin (15°) -m*ac where ac is the centripetal acceletarion which is equal to v^2/r

f= 750 *9.8 sin(15°)-750*(85*1000/3600)^2/150= -880 N

6 0
3 years ago
Other questions:
  • Table salt is blank mixed with other compunds
    6·1 answer
  • Which of the following terms describes the primary core of a comet?
    9·1 answer
  • The force of gravity down on the boy= 300N
    12·2 answers
  • What is the acceleration of this object? The object's mass is 60 kg.
    13·2 answers
  • Is the topic of atoms and elements a branch of physics??
    13·1 answer
  • An ideal spring with spring constant k is hung from the ceiling and a block of mass
    7·1 answer
  • While scuba diving, you have injured yourself and must signal the boat on the surface for help. As you always do when diving, yo
    9·1 answer
  • What is the speed of a bird of mass 8kg which has kinetic energy of 8836J?
    8·1 answer
  • When light of wavelength 160 nm falls on a gold surface, electrons having a maximum kinetic energy of 2. 66 ev are emitted. Find
    10·1 answer
  • A stationary body is acted upon by a number of forces. State the two conditions which must apply for the body to remain at rest.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!