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
sashaice [31]
4 years ago
13

Conpare and constrast chemical and physical change give an example of each

Chemistry
1 answer:
Harlamova29_29 [7]4 years ago
6 0

A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper. If the same piece of paper is burned, it is broken up into different substances that are not paper.


<span>When heat is given off in a chemical change or reaction, it is called an exothermic reaction. When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction. The speed at which chemical reactions take place depend on the temperature pressure and how concentrated the substances involved in the chemical reaction are. Sometimes substances called catalysts are used to speed up or help along a chemical reaction. Light is helpful in the processing of film.</span>

You might be interested in
please help asap i will mark you as brainly and give u 10 points ( don’t mind the answer i accidentally clicked )
Ne4ueva [31]

Answer:

Negative 5

Explanation:

I am not 100% sure btw

6 0
3 years ago
Read 2 more answers
As a distant star moves away from earth, the light given off by the star has a
Troyanec [42]

Answer:

The wavelength of these photons will become longer. The energy of each of these photons will become lower.

Explanation:

<h3>Wavelength</h3>

Light can be considered as electromagnetic waves. The wavelength of a wave is equal to the minimum distance between two troughs (lowest points) in this wave. On the other hand, the frequency of a wave is equal to the number of wavelengths that this wave travels in unit time.

Assume that the speed of light stays the same. The distance that this beam of light travels in unit time will be the same. However, with a lower frequency, there would be fewer wavelengths in that same distance. Therefore, the size of each wavelength will become longer.

If c represent the speed of light and f represents the frequency, then the wavelength would be:

\displaystyle \lambda = \frac{c}{f}.

<h3>Energy</h3>

The energy E of each proton of a beam of light is proportional to the frequency f of the light. Let h denote Planck's Constant. The numerical relation between E\! and f\! would be:

E = h\, f.

Therefore, if the frequency f of this light becomes smaller, the energy E of each of its proton will also become proportionally lower.

5 0
4 years ago
What kind of cell is represented by the diagram shown above?( I have 5mins plz answer quick).
Masja [62]

Answer: can't be animals or or plants its eater C or D but C can be correct.

Check tho.

3 0
3 years ago
Read 2 more answers
Explain why the standard enthalpy of formation () for Cl2 (g) is zero, but its standard entropy is larger than zero.
Galina-37 [17]

The standard enthalpy of formation for chlorine is zero but the standard entropy is larger than 0 because it is the elemental state of chlorine.

The standard enthalpy of formation for chlorine is zero because cl2 is the elemental state of chlorine and it does not require any energy for the formation of the standard state of chlorine.

The entropy of any system cannot be negative. It can only be positive or zero.

The entropy of a system will become zero only at a absolute zero temperature.

That's why the entropy of chlorine in elemental state is more than zero because absolutely zero temperature can't be obtained.

To know more about entropy, visit,

brainly.com/question/6364271

#SPJ4

7 0
1 year ago
How have forests been exploited by humans
Anuta_ua [19.1K]
I hope this will help you

3 0
3 years ago
Other questions:
  • When amoeba reproduce, they replicate their DNA and then divide in half. Thus,
    10·2 answers
  • A sample of fluorine gas has a volume of 5.63 L at 14°C and standard pressure. What will be the pressure in atm if the moles of
    11·1 answer
  • A 22.4 liter sample of gas at STP weighs 12.0 grams. What is the molecular weight of the gas?
    11·1 answer
  • In a robinson annulation, an α,-unsaturated carbonyl compound reacts with a carbonyl compound to afford a (new) cyclic α,-unsa
    7·1 answer
  • When layered into a single column, which water will sink to the bottom?
    12·1 answer
  • How are elements usually found?
    6·2 answers
  • Lakes, rivers, and streams make up what percent of the fresh water on Earth?
    10·2 answers
  • Who uses chemicals ?
    13·2 answers
  • How does the initial mass of the candle compare with the final mass? Does this violate the Law of Conservation of Mass? Explain
    9·1 answer
  • Fermentation results in the production of two ____________ molecules per molecule of glucose. b
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!