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
mixas84 [53]
3 years ago
15

Which of the following is the best indication that a chemical change has taken place?

Chemistry
2 answers:
kupik [55]3 years ago
4 0

Answer:

C

Explanation:

It is C because the change is inversible, that means that it is a chemical change.

Ugo [173]3 years ago
3 0
C the change is reversible I think
You might be interested in
The elements in the periodic table are arranged in order of
Alenkinab [10]

Answer:

dsgadsagsdgsd

Explanation:

5 0
4 years ago
Which has the lowest freezing point?
Maslowich
Freezing point depression depends of the number of particles of the solute in the solution.
1)Pure water have highest freezing point. All other solutions with given solutes will have lower temperatures. 
2) The more particles of the solute in the solution the lower freezing point is going to be.
<span>b. 1.0 m NaCl ( dissociates and give 2 mol ions (1 mol Na⁺ and 1 mol Cl⁻))
c. 1.0 m K3PO4 (</span>dissociates and give 4 mol ions (3 mol K⁺ and 1 mol PO4³⁻)<span>
d. 1.0 m CaCl2 (</span>dissociates and give 3 mol ions (1 mol Ca²⁺ and 2 mol Cl⁻))<span>
e. 1.0 m glucose (c6h12o6) (glucose does not dissociate, and solution have
1 mole of particles of the solute(glucose))

The largest number of particles has </span>1.0 m K3PO4  solution, and it is has lowest freezing point . Answer is C.
8 0
3 years ago
In the induced fit model of enzymes, a substrate associates itself with which part of an enzyme?
NNADVOKAT [17]
Hello.

Active site of the enzyme.

Have a nice day
8 0
3 years ago
A buffer solution contains 0.496 M hydrocyanic acid and 0.399 M sodium cyanide . If 0.0461 moles of sodium hydroxide are added t
pochemuha

Answer : The pH of the solution is, 9.63

Explanation : Given,

The dissociation constant for HCN = pK_a=9.31

First we have to calculate the moles of HCN and NaCN.

\text{Moles of HCN}=\text{Concentration of HCN}\times \text{Volume of solution}=0.496M\times 0.225L=0.1116mole

and,

\text{Moles of NaCN}=\text{Concentration of NaCN}\times \text{Volume of solution}=0.399M\times 0.225L=0.08978mole

The balanced chemical reaction is:

                          HCN+NaOH\rightarrow NaCN+H_2O

Initial moles     0.1116       0.0461     0.08978

At eqm.       (0.1116-0.0461)    0       (0.08978+0.0461)

                        0.0655                       0.1359

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[Salt]}{[Acid]}

Now put all the given values in this expression, we get:

pH=9.31+\log (\frac{0.1359}{0.0655})

pH=9.63

Therefore, the pH of the solution is, 9.63

4 0
3 years ago
H3C6H507 + H2O + H3O+ + H2C6H507<br> acid <br> base
Aleonysh [2.5K]

Explanation:

an acid will give away a proton and become a conjugate base.

A base will accept a proton and become a conjugate acid.

3 0
3 years ago
Other questions:
  • The equilibrium constant kc for the reaction hf(aq) + h2o(l) h3o+(aq) +f-(aq) is 3.5 x 10-4. what is the equilibrium concentrati
    12·1 answer
  • in 1965, the mean price of a new car was $2,650 and the standard deviation was $1,000. In 2011, the mean was $30,500 and the sta
    11·1 answer
  • The burette is dirty, how does it affect the NaOH?
    6·1 answer
  • Does plateau have low elevation
    5·1 answer
  • B. Why is this number called a "mass” number?
    11·1 answer
  • Two identical 732.0 L tanks each contain 212.0 g of gas at 293 K, with neon in one tank and nitrogen in the other. Based on the
    12·1 answer
  • Ammonia reacts with hypobromite OBr- as follows: NH3 OBr- ---&gt; N2 Br- H20 which is the limiting reactant if 5.00 ml of 0.623
    13·1 answer
  • Which of the following is not a type of thematic map? Help please
    6·1 answer
  • What is the overall charge on the compound, sodium hydroxide? explain
    13·1 answer
  • Various nitrogen oxides, as well as sulfur oxides, contribute to acidic rainfall through complex reaction sequences. Nitrogen an
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!