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
goldenfox [79]
3 years ago
13

Which statement correctly describes a physical change?

Chemistry
1 answer:
MArishka [77]3 years ago
4 0

Answer: Option (b) is the correct answer.

Explanation:

A change which brings no change in chemical composition of a substance is known as a physical change.

For example, melting of ice is a physical change as there occurs change in phase from solid state to liquid state of water. Whereas the structure of water remains the same.

Therefore, we can conclude that the statement which describes a physical change is that it may involve a change in phase but does not involve a change in the molecular structure.

You might be interested in
Oxygen freezes at -219°c and boils at -183°c in which state is oxygen at -200°c​
vova2212 [387]

oxygen is in gaseous state at this temperature

4 0
3 years ago
The most abundant gases in the atmosphere are _____. trace gases variable gases greenhouse gases primary gases
White raven [17]
The correct answer is greenhouse gases. It is the most abundant gases among the choices in the atmosphere. These gases are water vapor, methane, nitrous oxide, ozone and carbon dioxide. Without these gases, the temperature of Earth will be about -18 degrees Celsius.
3 0
3 years ago
Read 2 more answers
Which of the following compounds are held together by ionic bonds? Select all that apply.
Sergeu [11.5K]

Answer:

Explanation:

All of above except carbon dioxide

7 0
3 years ago
The acid-dissociation constants of HC3H5O3 and CH3NH3+ are given in the table below. Which of the following mixtures is a buffer
sergey [27]

Answer:

A mixture of 100. mL of 0.1 M HC3H5O3 and 50. mL of NaOH

Explanation:

The pH of a buffer solution is calculated using following relation

pH=pKa+log(\frac{salt}{acid} )

Thus the pH of buffer solution will be near to the pKa of the acid used in making the buffer solution.

The pKa value of HC₃H₅O₃ acid is more closer to required pH = 4 than CH₃NH₃⁺ acid.

pKa = -log [Ka]

For HC₃H₅O₃

pKa = 3.1

For CH₃NH₃⁺

pKa = 10.64

pKb = 14-10.64 = 3.36 [Thus the pKb of this acid is also near to required pH value)

A mixture of 100. mL of 0.1 M HC3H5O3 and 50. mL of NaOH

Half of the acid will get neutralized by the given base and thus will result in equal concentration of both the weak acid and the salt making the pH just equal to the pKa value.

8 0
3 years ago
What does anhydrous mean in your own words?
dalvyx [7]

Answer: no water

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • which type of weather technology often carries cameras that can make images of Earth's surface clouds and snow cover?
    7·1 answer
  • A galvanic cell at a temperature of 42°C is powered by the following redox reaction:
    15·2 answers
  • Why is hydrogen ion generation essential for atp production during photosynthesis
    5·1 answer
  • What is the density of a liquid that has a mass of 27g and a volume of 30mL?
    9·1 answer
  • The volume of a gas is 17.5 mL at 29◦C and
    11·1 answer
  • For below checmical equation (which may or may not be balanced), list the number of each type of atom on each side of the equati
    6·1 answer
  • So i have this question for science.- What is the element with the atomic number 7. Thank you.
    5·2 answers
  • PLEASE HELP!!!!!!!!!!!!!!
    9·1 answer
  • Which concept can explain the acidic character of Carbon dioxide?​
    14·2 answers
  • The molecular formula and molar mass of two straight-chain hydrocarbons are listed in the table above. Based on the information
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!