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
Nezavi [6.7K]
2 years ago
9

How much thermal energy must be added to a 87.5 g sample of ice at -25oC completely melt the entire sample? As part of your work

, sketch a labelled heating curve. Circle the portion of the curve that is the focus of this question.
Chemistry
1 answer:
Maurinko [17]2 years ago
6 0

Answer:

4.6 kJ

Explanation:

The energy required to raise the temperature of a substance from its initial temperature to a final temperature is given by:

Q = mcΔT

Where Q = energy, c = specific heat capacity of substance and ΔT = final temperature - initial temperature

Given that:

c = 2.1 kJ/kg°C, m = 87.5 = 0.0875 kg, ΔT = final temperature - initial temperature  = 0 - (-25) = 25

Q = 0.0875 * 2.1 *25

Q = 4.6 kJ

You might be interested in
If an atom has three protons three neutrons and two electrons what is the electrical charge of the atom
Olenka [21]

Answer:

let assume the atom be x so the charge will be x^+

8 0
3 years ago
Read 2 more answers
Determina el pH de una solución si la concentración de H es 3.5 x 10 molar, e indicar si es acido o bas
erastovalidia [21]

Answer:

Explanation:

IT'S FOR NOW, PLEASE DELIVER IT TODAY !!! I NEED HELP IT'S CHEMICAL WORK...

5 0
3 years ago
Minerals with the silicon-oxygen structure shown in Figure 2-1 are classified into what group?
egoroff_w [7]
B----------- oxide is the correct answer
6 0
3 years ago
Which solution below has the highest concentration of hydroxide ions?a. pH= 3.21b. pH= 7.00c. pH= 7.93d. pH= 12.59e. pH= 9.82
Sloan [31]

Answer:

  • <em>The solution that has the highest concentration of hydroxide ions is </em><u>d. pH = 12.59.</u>

Explanation:

You can solve this question using just some chemical facts:

  1. pH is a measure of acidity or alkalinity: the higher the pH the lower the acidity and the higher the alkalinity.
  2. The higher the concentration of hydroxide ions the lower the acidity or the higher the alkalinity of the solution, this is the higher the pH.

Hence, since you are asked to state the solution with the highest concentration of hydroxide ions, you just pick the highest pH. This is the option d, pH = 12.59.

These mathematical relations are used to find the exact concentrations of hydroxide ions:

  • pH + pOH = 14 ⇒ pOH = 14 - pH

  • pOH = - log [OH⁻] ⇒ [OH^-]=10^{-pOH}

Then, you can follow these calculations:

Solution    pH        pOH                            [OH⁻]

a.               3.21       14 - 3.21 = 10.79        antilogarithm of 10.79 = 1.6 × 10⁻¹¹

b.               7.00      14 - 7.00 = 7.00        antilogarithm of 7.00 = 10⁻⁷

c.                7.93      14 - 7.93 = 6.07        antilogarithm of 6.07 = 8.5 × 10⁻⁷

d.               12.59     14 - 12.59 = 1.41        antilogarithm of 1.41 = 0.039

e.               9.82      14 - 9.82 = 4.18        antilogarithm of 4.18 = 6.6 × 10⁻⁵

From which you see that the highest concentration of hydroxide ions is for pH = 12.59.

5 0
3 years ago
Will give brainlsit need answers asap!
k0ka [10]

Answer:

120 g of NaCl in 300 g H20   at 90 C

Explanation:

At x = 90   go vertical to the line for NaCl...then go left to the y-axis to find the solubility in 100 g H20   = 40

we want   300 g H20    so multiply this by  3    to get   120 gm of NaCl in 300 g

7 0
2 years ago
Other questions:
  • The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories). If one
    6·2 answers
  • Which property can be defined as the ability of a substance to be hammered into thin sheets
    13·2 answers
  • Nitrogen gas reacts with hydrogen gas to form nitrogen trihydride?
    15·1 answer
  • Please help me ASAP!!!
    12·1 answer
  • 25 g of a compound is added to 500 mL of water if the freezing point of the resulting solution is
    15·1 answer
  • At constant volume, you cool a sealed, air-filled can, and the pressure reduces by half. What happens in this situation? The num
    6·1 answer
  • An atom of oxygen has six valence electrons. In nature, oxygen is a diatomic molecule and is usually found in the form O2. Why w
    6·1 answer
  • When the ocean absorbs co2 the ph of the ocean water drops. what's the effect of this process answers?
    13·1 answer
  • How the metals react with oxygen? Give the general formula and explain the reaction of sodium with oxygen with chemical equation
    13·1 answer
  • How many moles is 1.8 x 1023 atoms of Be?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!