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
Vikentia [17]
3 years ago
11

Are phase changes physical or chemical changes? why?

Chemistry
2 answers:
Studentka2010 [4]3 years ago
6 0
Physical! Because they do not modify the nature of the substance ( if you look at the chemical level) and it is reversible

Vapor is H20
Water is H20
Ice is H20

A chemical changes is not reversible
Burning wood for example! And the reactants interact together to form a new product.
Reptile [31]3 years ago
3 0
<h2>Answer:</h2>

Physical changes

<h2>Example:</h2>

You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice. The water molecules are still water molecules.

You might be interested in
A sample of damp air in a 1.00 L container exerts a total pressure of 741.0 torr at 20 oC; but when it is cooled to -10 oC, the
AlexFokin [52]

From the information presented in the question, the number of molecules present of water present is obtained 2.41 × 10^21 molecules.

From the information we have;

Volume of the damp air =  1 L

Pressure of the damp air =  741.0 torr or 0.975 atm

Temperature of the gas = 20 oC + 273 = 293 K

R = 0.082 atm LK-1mol-1

Number of moles = ?

n =PV/RT

n = 0.975 × 1/0.082 ×  293

n = 0.041 moles

Volume of water vapor = 1 L

Temperature of water = -10 oC + 273 = 263 K

Pressure of the gas = 607.1 torr or 0.799 atm

R = 0.082 atm LK-1mol-1

n= PV/RT

n = 0.799 × 1/ 0.082 × 263

n = 0.037 moles

Number of moles of water = 0.041 moles -  0.037 moles = 0.004 moles

If 1 mole = 6.02 × 10^23 molecules

0.004 moles = 0.004 moles × 6.02 × 10^23 molecules/1 mole

= 2.41 × 10^21 molecules

Learn more: brainly.com/question/2510654

5 0
2 years ago
How are nitrogen-14 and nitrogen-15 same and different?
Likurg_2 [28]

Answer:

Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers. Nitrogen-14 and nitrogen-15 are both stable isotopes of nitrogen. However, the other 5 isotopes are all unstable.

7 0
3 years ago
Water boils at what degrees Celsius
Archy [21]
100 degrees Celsius. And apparently this answer needs at least 20 characters to explain it well. But yes, the answer is 100 degrees Celsius
4 0
3 years ago
Read 2 more answers
Order the terms according to the path followed by oxygen during cellular respiration.​
MArishka [77]

Answer:

Outside air

Nose

Lungs

Bloodstream

Cell

Explanation:

We breathe in oxygen from the outside air in through our nose and it travels to our lungs. Inside our lungs, we have Avioli's that diffuse oxygen into our bloodstream and the bloodstream helps the oxygen travel into our cells.

Hope this helps :)

8 0
3 years ago
WILL GIVE BRAINLIEST AND 10 POINTS!
GarryVolchara [31]

Student B because it requires a hypothesis

4 0
3 years ago
Read 2 more answers
Other questions:
  • Starting with 0.250L of a buffer solution containing 0.250 M benzoic acid (C 6H 5COOH) and 0.20 M sodium benzoate (C 6H 5COONa),
    13·1 answer
  • EASY 8TH GRADE SCIENCE PLEASE HELP
    8·1 answer
  • What is the chemical formula for a compound that has 1 Nitrogen and 3 atoms of Hydrogen?
    14·1 answer
  • 3CI02+NO_3-+H_2O--&gt; NO +3CIO3-+2H+In the above redox reaction, use oxidation numbers to identify the element oxidized, the el
    15·1 answer
  • What can destroy buffer solution?
    13·1 answer
  • A cube of metal has a mass of 5.05 x 10°g and its density is known to be 12.77 g/mL, what is the volume of this metal?
    12·1 answer
  • Anyone know the answer to this one?
    15·1 answer
  • All of the following are landforms that can contribute to climate EXCEPT
    9·1 answer
  • If I mix two chemicals in a test tube and notice after a few seconds that there are ice crystals forming on the outside of the t
    6·1 answer
  • There are three different dichloroethylenes (molecular formula C₂H₂Cl₂), which we can designate X, Y, and Z. Compound X has no d
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!