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
Karolina [17]
3 years ago
9

Meera added blue copper sulphate crystals to some water in a beaker.

Chemistry
1 answer:
professor190 [17]3 years ago
7 0

Answer:

The solid crystals disappeared

Explanation:

When a soluble solid solute is added to water, the solid solute disappears after a little while. The disappearance of this solute indicates that the solute has been dissolved in water.

In this case, blue copper sulphate crystals are added to water, the blue crystals disappear leaving only a blue solution. The disappearance of these blue copper sulphate crystals indicates that the substance has dissolved in water.

You might be interested in
Aspirin (acetylsalicylic acid, C9H8O4) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolv
Triss [41]

Answer:

1. 3.57\times 10^{-4}was the K_a value calculated by the student.

2. 5.93\times 10^{-4}was the K_b of ethylamine value calculated by the student.

Explanation:

1.

The pH value of Aspirin solution = 2.62

pH=-\log[H^+]

[H^+]=10^{-2.62}=0.00240 M

Moles of s asprin = \frac{2.00 g}{180 g/mol}=0.01111 mol

Volume of the solution = 0.600 L

The initial concentration of Aspirin  = c = \frac{0.01111 mol}{0.600 L}=0.0185 M

HAs\rightleftharpoons As^-+H^+

initially

c       0    0

At equilibrium

(c-x)      x   x

The expression of dissociation constant :

K_a=\frac{[As^-][H^+]}{[HAs]}:

K_a=\frac{x\times x }{(c-x)}

=\frac{0.00240 M\times 0.00240 M}{(0.0185-0.00240 )}

K_a=3.57\times 10^{-4}

3.57\times 10^{-4}was the K_a value calculated by the student.

2.

The pH value of ethylamine = 11.87

pH+pOH=14

pOH=14-11.87=2.13

pOH=-\log[OH^-]

[OH^-]=10^{-2.13}=0.00741 M

The initial concentration of ethylamine = c = 0.100 M

C_2H_5NH_2+H_2O\rightleftharpoons C_2H_5NH_3^{+}+OH^-

initially

c                    0    0

At equilibrium

(c-x)                x   x

The expression of dissociation constant :

K_b=\frac{[C_2H_5NH_3^{+}][OH^-]}{[C_2H_5NH_2]}:

K_b=\frac{x\times x}{(c-x)}

=\frac{0.00741\times 0.00741}{(0.100-0.00741)}

K_b=5.93\times 10^{-4}

5.93\times 10^{-4}was the K_b of ethylamine value calculated by the student.

3 0
3 years ago
In a chemical reaction, the difference between the potential energy of the products of the potential energy of the reactants is
Svetradugi [14.3K]
Your question looks a bit incomplete as you have the same contents in options a) and d). According to your list, I can't see the correct answer, but I can give you one.The difference between the potential energy of the products of the potential energy of the reactants is equal to the enthalpy of the reaction.
7 0
3 years ago
Read 2 more answers
How much does one molecule of ethane (C2H6) weigh? anwser in units of g/molec.
Sladkaya [172]
30.07 g/mol (that’s grams per mole)
8 0
3 years ago
when the orbitals or energy levels of an atom are full, it is considered to be stable. which atom in the ground state has a stab
Sonbull [250]

Answer:

Noble gases, atoms which have complete filled outer orbits.

Explanation:

SInce, you have given no options elements like Neon, Helium,etc

7 0
2 years ago
Period, block, and group
Sedaia [141]

Answer:

what do you mean

Explanation:

8 0
3 years ago
Other questions:
  • Some facts or characteristics of endoplasmic reticulum
    14·1 answer
  • Consider the compound hydroxyapatite, Ca10(PO4)6(OH)2. Name each ion present, give the charge of each ion and show that the form
    8·1 answer
  • At dinner your brother got mad and threw your burrito at a speed of 4 m/s. It flies for 18 seconds trough the air. How much dist
    6·1 answer
  • Can cells have different types of openings?
    10·1 answer
  • What conversion factor would you use to convert grams to kilograms?
    9·2 answers
  • Assessment
    15·1 answer
  • The charge on the most stable ion of zinc​
    8·1 answer
  • Explain What is an elementary reaction and how is it related to a reaction mechanism
    14·1 answer
  • How much aluminum nitrate can be found when 21g of aluminum react with lead (II) nitrate? Answer in units of mol.
    7·1 answer
  • This question is about salts.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!