answer.
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
alina1380
1 month ago
8

A 25.0-g sample of ice at -6.5oC is removed from the freezer and allowed to warm until it melts. Given the data below, select al

l the options that correctly reflect the calculations needed to determine the total heat change for this process.
Melting point at 1 atm = 0,0°C; -2.09 J/g.°C; Cloud -4.21J/g °C, AH -6,02 kJ/mol
Check all that apply.

A. q for the temperature change from -6,5°C to 0.0°C is glven by 25.0 x 6.02 = 151 kJ
B. q for the phase change is given by 1.39 x 6.02 = 8.37 kJ
C. There are 3 separate heat change stages in this process.
D. The total heat change for the process is equal to +8.71 kJ
E. The total heat change for the process is equal to +350 kJ
Chemistry
1 answer:
KiRa [2.9K]1 month ago
7 0

Answer:

B, D

Explanation:

We need to recognize that the ice will rise in temperature from -6.5 ºC to 0 ºC for it to change into water.

Let's define q₁ as the heat needed to warm the ice to 0ºC, and q₂ as the heat for the transition from solid to liquid.

The calculation for q₁ is as follows:

q₁ = s x m x ΔT, where s represents the specific heat of ice (2.09 J/gºC), m is the mass, and ΔT is the temperature difference.

For q₂, the enthalpy of fusion is computed as:

q₂ = C x ΔT

with C indicating the specific heat for the phase transition, denoted as AH in kJ/mol.

All necessary data for computing q₁, q₂, and the total heat change (q₁ + q₂) is provided.

q₁ = 25.0 g x (2.09 J/gºC) x (0 - (-6.5 ºC))

q₁ = 339.6 J = 0.339 kJ

q₂ = (25 g/18 g/mol) x 6.02 kJ/mol = 1.39 x 6.02 kJ = 8.36 kJ

Combining these values gives us qtotal = 0.339 kJ + 8.36 kJ = 8.70 kJ.

Now we can answer the question:

(a) False, AH refers to the heat capacity during melting.

(b) True, as we concluded earlier.

(c) False, there’s only one phase transition from solid (ice) to liquid.

(d) True based on our calculations above.

(e) False, according to our findings.

You might be interested in
The electron configuration of an element is 1s22s22p4. Describe what most likely happens when two atoms of this element move tow
castortr0y [3046]

Answer:

Cuando dos átomos se acercan entre sí, se genera un compuesto al compartir pares de electrones que cada uno de los átomos aporta, permitiéndoles alcanzar los 8 electrones de valencia (octeto) en su capa externa.

Explanation:

La configuración electrónica del elemento puede escribirse de la siguiente manera;

1s²2s²2p⁴

La configuración electrónica dada es equivalente a la del oxígeno, por lo tanto, tenemos;

El número de electrones en la capa de valencia = 2 + 4 = 6 electrones

Por consiguiente, cada átomo necesita 2 electrones para completar sus 8 electrones (octeto) en la capa externa.

Al acercarse los dos átomos, reaccionan y se combinan para formar un compuesto al compartir 4 electrones, 2 de cada átomo, de modo que cada átomo obtenga 2 electrones adicionales en su órbita externa en el nuevo compuesto y así se logre la configuración estable de octeto para cada uno de los átomos en el compuesto recién formado.

4 0
2 months ago
Read 2 more answers
A flexible container has 5.00 L of nitrogen gas at 298 K. If the temperature is increased to 333K, what will the new volume of t
lorasvet [2795]

Givens

  • V1 = 5.00 L
  • V2 =?
  • T1 = 298 K
  • T2 = 333 K

Formula

V1/T1 = V2/T2

Note: This will be applicable only if the pressure remains constant.

Solution

5.00L / 298 K = x / 333 K. Multiply both sides by 333 K.

5.00 * 333 / 298 = x 333/ 333

V2 = 5.59 L

 

3 0
1 month ago
During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a
KiRa [2933]
The transformation involves converting thermal energy into chemical energy. Sugar is rich in chemical potential energy, which explains why it serves as an energy source for living organisms. Photosynthesis utilizes sunlight to transform carbon dioxide and water into sugar and oxygen, effectively changing the thermal energy from light into the chemical energy stored in sugar.

I hope this clarifies things. If you have any questions, feel free to ask.
4 0
18 days ago
Read 2 more answers
Cathodic protection of a metal pipe against corrosion usually entails __________.
VMariaS [2998]

Answer:

C. connecting an active metal to designate the pipe as the cathode in an electrochemical cell.

Explanation:

Cathodic protection involves a method to manage the accelerated corrosion of a metal surface by designating it as the cathode within an electrochemical cell. This is accomplished by attaching the protected metal to a more sacrificial metal, which acts as the anode.

This method helps to preserve the metal by introducing a highly reactive metal that serves as the anode, supplying free electrons. By adding these free electrons, the active metal gives up its ions, protecting the less reactive steel from corrosion.

3 0
1 month ago
What volume of 0.550 M KBr solution can you make from 100.0 mL of 2.50 M KBr?
castortr0y [3046]
M1V1 = M2V2
(2.50)(100.0) = (0.550)V2
V2 = 455mL

From 100.0 mL of 2.50 M KBr, you can prepare 455 mL of 0.550 M solution.
5 0
2 months ago
Read 2 more answers
Other questions:
  • 2. Your company currently uses a process with a similar cost of materials that has an
    6·1 answer
  • Calculate the molarity of a 23.55-ml solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, =
    9·1 answer
  • Arbon dioxide is dissolved in blood (ph 7.5) to form a mixture of carbonic acid and bicarbonate. Part a neglecting free co2, wha
    9·2 answers
  • If kc = 7.04 × 10-2 for the reaction: 2 hbr(g) ⇌h2(g) + br2(g), what is the value of kc for the reaction: 1/2 h2(g) + 1/2 br2 ⇌h
    14·1 answer
  • A laser pointer used in the classroom emits light at 5650 Å, at a power of 4.00 mW. (One watt is the SI unit of power, the measu
    10·2 answers
  • Determine Z and V for steam at 250°C and 1800 kPa by the following: (a) The truncated virial equation [Eq. (3.38)] with the foll
    13·1 answer
  • You are standing on the rim of a canyon, you drop a rock and in 7.0 seconds hear the sound pof it hitting the bottom, how deep i
    13·1 answer
  • When a stable diatomic molecule spontaneously forms from its atoms, what are the signs of Delta H, Delta S, and Delta G? A. + +
    14·1 answer
  • Write the complete balanced equation for the neutralization reaction that occurs when aqueous hydroiodic acid, HI, and sodium hy
    14·1 answer
  • A cucumber is placed in a concentrated salt solution. What will most likely happen?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!