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
DENIUS [597]
3 years ago
12

Which of these are physical changes in matter check all that apply . ​

Chemistry
2 answers:
sergeinik [125]3 years ago
7 0

What answers are there? you didn't add them.

physical change and chemical change.

physical change affects a substance's physical properties, and a chemical change affects its chemical properties.

Orlov [11]3 years ago
6 0

Answer:

boiling water

sharpening a pencil

freezing water

You might be interested in
For any molecule at the surface the resulting surrounding forces equal zero
Katarina [22]
False is the correct answer
4 0
3 years ago
Read 2 more answers
Leon uses a pressure gauge to measure the air pressure in one of his car tires. The gauge shows that the pressure is 220 kilopas
mamaluj [8]

Answer:

53.8 L

Explanation:

Ideal gas law

PV=nRT

must be for volume so we arrange to V=nRT/P

V= (4.8)(8.31)(297)/220

3 0
3 years ago
Read 2 more answers
The heat of fusion AH, of ethyl acetate (C4H802) is 10.5 kinol. Calculate the change in entropy as when 398. g of ethy, acetate
Hitman42 [59]

<u>Answer:</u> The entropy change of the ethyl acetate is 133. J/K

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of ethyl acetate = 398 g

Molar mass of ethyl acetate = 88.11 g/mol

Putting values in above equation, we get:

\text{Moles of ethyl acetate}=\frac{398g}{88.11g/mol}=4.52mol

To calculate the entropy change for different phase at same temperature, we use the equation:

\Delta S=n\times \frac{\Delta H_{fusion}}{T}

where,  

\Delta S = Entropy change  = ?

n = moles of ethyl acetate = 4.52 moles

\Delta H_{fusion} = enthalpy of fusion = 10.5 kJ/mol = 10500 J/mol   (Conversion factor:  1 kJ = 1000 J)

T = temperature of the system = 84.0^oC=[84+273]K=357K

Putting values in above equation, we get:

\Delta S=\frac{4.52mol\times 10500J/mol}{357K}\\\\\Delta S=132.9J/K

Hence, the entropy change of the ethyl acetate is 133. J/K

7 0
3 years ago
14 Copper(II) oxide reacts with hydrogen.
e-lub [12.9K]

Answer:

B

CuO

H2

Explanation:

hydrogen will oxidized to form water

6 0
3 years ago
When 200g water goes from a temperature 10C to 40C, is heat absorbed or released?
gayaneshka [121]

how would it be possible to even be absorbed?? the answer is released.

8 0
3 years ago
Other questions:
  • Which of the following equations does not demonstrate the law of conservation of mass
    14·2 answers
  • Which of the following possible outcomes regarding the universe do scientists think is most likey?
    13·2 answers
  • How do I write 2.345 X 10^-4cm out of scientific notation?
    9·1 answer
  • Q8.what happened to the mixture?
    10·1 answer
  • What did Rutherford’s scattering experiment reveal about the structure of atoms?
    13·1 answer
  • What is nitrogen???? explain!!! ​
    5·2 answers
  • Which of the following elements is represented by the above graphic​
    11·1 answer
  • I need halp with this one
    14·1 answer
  • How many hydrogen atoms are in 89.5 g of<br> C6H6 ?<br> Answer in units of atoms.
    8·1 answer
  • How much energy is required to completely vaporize 250 grams of liquid water that is already at 100 degrees Celsius? Show your w
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!