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
Harman [31]
3 years ago
12

Which of the following is an irreversible physical change?

Chemistry
1 answer:
Yuliya22 [10]3 years ago
3 0

Answer:

b) sharpening a pencil

Explanation:

If you melt lead, boil water, or dissolve sugar in water, you can return all of them back to their original state. If you sharpen a pencil, you can't reattach the shavings as they were originally.

You might be interested in
what mass of chromium (III) sulfide is produced from the reaction of 13.2 g of sulfur with excess chromium?
Andreas93 [3]

Answer: Cr2S3

Explanation:

5 0
3 years ago
Read 2 more answers
Which of the following statements concerning equilibrium constants is true? The equilibrium constant of the reverse reaction is
Brut [27]

Answer:

When the coefficients in a balanced chemical reaction are multiplied by two, the equilibrium constant is not affected.

Explanation:

The equilibrium constant of a reaction is known to remain steady.

Even if all the coefficients of all the species in the reaction are multiplied by two, the value of the equilibrium constant will reamin the same because the equilibrium position will not change as a result of that.

3 0
3 years ago
How does this article relate to me?
mario62 [17]
I cant help unless there is an article..
4 0
3 years ago
Read 2 more answers
Explain why boats can float when they are made out of material that is more dense than water? Your answer must include informati
cluponka [151]
I need help to cause it asked me that questions
5 0
3 years ago
Use the molar heat capacity for aluminum from table 1 to calculate the amount of energy needed to raise the temperature of 260.5
Nimfa-mama [501]
Unfortunately, you failed to include the table 1 from which the molar heat capacity of aluminum could have been obtained. However, as a general rule, the heat needed to raise the temperature of a certain substance by certain degrees is calculated through the equation,
                            H = mcpdT
where H is heat, m is mass, cp is specific heat capacity, and dT is change in temperature. From a reliable source, cp for aluminum is equal to 0.215 cal/g°C. Substituting this to the equation,
                               H = (260.5 g)(0.215 cal/g°C)(125°C - 0)
                                        H = 7000.94 cal
6 0
3 years ago
Other questions:
  • How many grams of NH3 can be produced from 2.93 mol of N2 and excess H2.
    14·1 answer
  • Can someone help me with this please
    9·2 answers
  • Which type of radiation is blocked by the skin but is the most dangerous once it is inside the body?
    7·2 answers
  • If 1495 J of heat is needed to raise the temperature of a 319 g sample of a metal from 55.0°C to 66.0°C, what is the specific he
    12·1 answer
  • A lahar is a type of mudflow that occurs
    8·1 answer
  • For the reaction N2(g) + 3H2(g) 2NH3(g), what will happen if more nitrogen gas is added?
    14·1 answer
  • What is the formula of tin (II) acetate?
    6·2 answers
  • considering the chemical reaction for cellular respiration, what must be included in the respirometer containing the germinating
    7·1 answer
  • 4. What are the products (things made) in photosynthesis?
    11·2 answers
  • Complete the balanced chemical reaction for the following weak base with a strong acid. In this case, write the resulting acid a
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!