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
Feliz [49]
2 years ago
11

Which of the following sentences represents a physical change? sugar dissolves in coffee iron rusts gasoline burns in an engine

a candle burns
Chemistry
2 answers:
maria [59]2 years ago
7 0
The sentence that represents a physical change is sugar dissolves in coffee.
The reason why this is a physical, and not a chemical change is because the sugar completely changed its state - it used to be solid, but then it melted into the coffee and became liquid.
The other options are all chemical changes. 
MAXImum [283]2 years ago
6 0

<u><em>Answer:</em></u>

  • Physical changes example is sugar dissolves in coffee
  • Chemical changes examples are iron rusts, gasoline burns in an engine and a candle burns.

Explanation.

  • Physical changes depend on only physical state, not on composition, which can be separated by physical means while chemical changes depend on composition and only separated by chemical ways.
  • As in case of iron rusting, gasoline and candle burn are cases chemical changes bcz they convert into another substance whose composition is different from other as compare to sugar which has same composition in coffee ,only state is changed from solid to liquid.

You might be interested in
What is the charge of a proton? neutral negative positive
Brilliant_brown [7]
The charge of a proton is positive.
4 0
3 years ago
24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has
12345 [234]

pH of the solution after 24. 00 ml of the hcl has been added is 12.87

millimoles NaOH = mL x M = 24.00 mL x 0.25 M = 6.00

millimoles HCl = 24.00 mL x 0.10 M = 2.40

total volume = 48.00 mL

.................................NaOH + HCl ==>NaCl + H2O

initial.........................6.00.........0............0.........0

added.....................................2.40............................

change.................... -2.40......-2.40.........+2.40.... +2.40

equilibrium.................3.60.........0..............2.40.......2.40

The NaCl contributes nothing to the pH of the final solution. The pH is determined by the excess of NaOH present. (NaOH) = millimoles/mL = 3.60/48.00 = 0.075 M = (OH^-)

pOH = -log (OH^-). Then

pOH = -log (0.075)

pOH =1.1249

As we know,

pH + pOH = pKw = 14.00

pH=14-pOH

pH=14-1.1249

pH=12.87

<h3>What is pH?</h3>

pH is a logarithmic measure of an aqueous solution's hydrogen ion concentration. pH = -log[H+], where log is the base 10 logarithm and [H+] is the concentration of hydrogen ions in moles per liter.

The pH of an aqueous solution describes how acidic or basic it is, with a pH less than 7 being acidic and a pH greater than 7 being basic. A pH of 7 is regarded as neutral (e.g., pure water). pH values typically range from 0 to 14, though very strong acids may have a negative pH and very strong bases may have a pH greater than 14.

Learn more about pH:

brainly.com/question/491373

#SPJ4

7 0
1 year ago
Why is it better to allow the solvent front to move almost to the top of a paper strip rather than stopping it at the halfway po
m_a_m_a [10]

Answer:

To allow all the elements or compounds to separate complete.

Explanation:

In chromatography, the compounds need some space and time to separate, one from each other, if you  just use the half of the paper strip maybe you will not notice the different spots of compounds. Remember all the substances have different affinity for the solvents, that means, some react very quickly but others need more time as the colors that conform the black color in an ink.

4 0
3 years ago
What is a temperature scale used by scienctist?
laila [671]
To measure the kinetic engery  from the inside and outside of something to be able to tell how hot or coll something is.. without touching it also
3 0
3 years ago
Why does beryllium lose electrons when forming ionic bonds,while sulfur gains electrons?
Nadya [2.5K]
Beryllium is a metal so it needs to loose electrons to have a full outer shell while sulfur is a non-metal so it needs to gain electrons to fill its outer shell.
8 0
3 years ago
Other questions:
  • Specify whether each compound is soluble in hexane.Classify the appropriate items to their respective category.
    8·1 answer
  • Which has a greater ionization energy, Ne or Gallium?
    6·1 answer
  • Which of the following is the term used to describe a set of elements whose properties tend to be largely predictable based on p
    6·2 answers
  • Where does the formation of rocks began
    8·1 answer
  • if 150g of aluminum react with 101g of sulfuric acid what is the maximum amount of hydrogen gas that can be produced
    6·1 answer
  • A testable question is one that _____.
    14·2 answers
  • Can gravity be considered a force?
    10·1 answer
  • Some one please Help and Thank you <br>​
    6·1 answer
  • Which alkaline earth metal is the components of quick lime​
    12·2 answers
  • who wants to be my pen pal if you want to know what that is it means a person who writes letters to each other.
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!