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
Korvikt [17]
2 years ago
9

You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but subs

tance B does not. What most likely happened in this situation? A chemical change occurred in both substances. A physical change occurred in substance A, and a chemical change occurred in substance B. A physical change occurred in both substances. A chemical change occurred in substance A, and a physical change occurred in substance B.
Chemistry
1 answer:
ryzh [129]2 years ago
8 0

The reason why A returned to its original color but B did not is because; A  chemical change occurred in substance A, and a physical change occurred in substance B.

A chemical change results in a change in the "composition" of a substance. When the composition of the substance changes, the change is often irreversible.

A physical change does not alter the composition of a substance hence a physical change is easily reversible.

Since A did not return to its former color, it underwent a chemical change while B underwent a physical change since it returned to its former color.

Learn more: brainly.com/question/6284546

You might be interested in
What are 3 common uses for the Uranium Element?
ipn [44]
Uranium provides nuclear fuel used generate electricity in nuclear power station,also used by the military to power nuclear submarines and in nuclear weapons.
4 0
3 years ago
A certain liquid has a normal boiling point of and a boiling point elevation constant . A solution is prepared by dissolving som
irinina [24]

Answer:

m_{KBr}=6.030gKBr

Explanation:

Hello.

In this case, since the normal boiling point of X is 117.80 °C, the boiling point elevation constant is 1.48 °C*kg*mol⁻¹, the mass of X is 100 g and the boiling point of the mixture of X and KBr boils at 119.3 °C, we can use the following formula:

(T_b-T_b_0)=i*m*K_b

Whereas the Van't Hoff factor of KBr is 2 as it dissociates into potassium cations and bromide ions; it means that we can compute the molality of the solution:

m=\frac{T_b-T_b_0}{i*K_b}=\frac{(119.3-117.8)\°C}{2*1.48\°C*kg*mol^{-1}}\\  \\m=0.507mol/kg

Next, given the mass of solventin kg (0.1 kg from 100 g), we compute the moles KBr:

n_{KBr}=0.507mol/kg*0.1kg=0.0507mol

Finally, considering the molar mass of KBr (119 g/mol) we compute the mass that was dissolved:

m_{KBr}=0.0507mol*\frac{119g}{1mol} \\\\m_{KBr}=6.030gKBr

Best regards.

3 0
3 years ago
Calculate the mass of 2.500 mol of magnesium hydroxide.
Charra [1.4K]

Answer:145g

Explanation:

5 0
3 years ago
25 points awarded to best answer, keep in mind it is a CER
nataly862011 [7]

Answer:

only god knows

Explanation:

6 0
3 years ago
the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane
Blababa [14]

Answer:

78.14 % B; 21.86 % H

Step-by-step explanation:

The formula of diborane is B₂H₆.

The masses of each element are:

2B  = 2 × 10.81    = 21.62    u

6H = 6 ×   1.008 = <u>  6.048  u </u>

             TOTAL =  27.67    u


% B = 21.62/27.67 × 100

        = 78.14 %

% H = 6.048/ 27.67

        = 21.86 %

3 0
3 years ago
Read 2 more answers
Other questions:
  • What would indicate that a physical change takes place when copper is drawn into wire?
    10·2 answers
  • An unknown solution has a ph of 8. how would you classify this solution?
    14·1 answer
  • Which has the least potential energy? Solids liquids or gases?
    8·2 answers
  • Why is distilled water added to the crucible after igniting the magnesium metal?
    7·2 answers
  • The volume of a gas is increased from 0.5 L to 4.0 L while the temperature is held constant. The pressure of the gas will go fro
    12·1 answer
  • Imagine that 27.0 g of C2H2(g) dissolves in 1.00 L of liquid acetone at 1.00 atm pressure. If the partial pressure of C2H2(g) is
    13·1 answer
  • Which technology was essential for the development of the cell theory?​
    11·1 answer
  • Which of the following elements is most likely to form a covalent bond?
    7·1 answer
  • The freezing and thawing action of water affects a rock by?
    9·2 answers
  • Explain where the weight of an atom is found what is responsible for that weight and why
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!