CHEMISTRY COLLEGE

A 1000 ml sample of 0.300 M NaOH is mixed with 100.0 ml of 0.300 M HCl in a coffee cup calorimeter. If both solutions are at 20.0 °c and the final temperature of the mixture was 22.0 °c Find the heat of neutralization, AHreu in kJ/mole. Assume no heat is lost to the surroundings, the density of all solutions is 1.00 g/mL, and C, of the mixture is 4.184 J/g·°C

Answers

Answer 1
Answer:

Answer:

ΔH(neu) = 30.68 kJ/mol

Explanation:

The reaction between HCl (strong acid) and NaOH(strong base) is a neutralization reaction which yields sodium chloride NaCl and water

The heat (q) of a reaction is given as:

where m = mass of the system

c = specific heat

T1 and T2 are the initial and final temperatures

It is given that:

Volume of HCl = 1000 ml

Volume of NaOH = 100.0 ml

Density of HCl and NaOH = 1.000 g/ml

Total mass of the solutions, m = 1000 +100.0 = 1100.0 g

c = 4.184 J/g/c

T1 = 20.0C

T2 = 22.0 C

Substituting appropriate values in equation (1) gives:

Now, the number of moles of NaOH is:

Enthalpy of neutralization is:


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Solute molecules dissolve into the solvent through random molecular motion with the goal of ________.

Answers

There are no given choices so I can't exactly give the answer. However, the idea of mixing the solute and the solvent is dissolution. The goal is to achieve maximum interaction between solute and solvent to make a uniform solution. In this case, you can form intermolecular forces between the two.

D) reaching equilibrium in the solution

next time put the answer choices to make life easier

HIGH SCHOOL

Identify the spectator ions in the following molecular equation. KBr(aq) + AgNO3(aq) → AgBr(s) + KNO3(aq)
I'm not sure what the rules are for assigning oxidation numbers.

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The identification of the spectator ions should be K+ and NO3-

Identification of the  spectator ions:

Here the chemical equation should be written again in the net ionic equation

KBr(aq) + AgNO3(aq) → AgBr(s) + KNO3(aq)

K+ + Br- + Ag + + NO3-  = AgBr + K + NO3-

Here only aqueous solutions should be dissociated. Also, Spectator ions should be present in both sides, so these are K+ and NO3-. The rules of assigning oxidation numbers are to identify the number of valence

Learn more about equation here: brainly.com/question/19119593

We can rewrite the equation KBr(aq) + AgNO3(aq) → AgBr(s) + KNO3(aq) into its net ionic equation into
 K+ + Br- + Ag + + NO3-  = AgBr + K + NO3-only aqueous solutions can dissociate. Spectator ions are present in both sides, hence these are K+ and NO3-. THe rules of assigning oxidation numbers is to identify the number of valence electrons of elements and may be arbitrary depending on the charge of the molecule. 
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What is the electron configuration for a neutral atom of selenium? For a neutral atom of beryllium?

Answers

The electronic configuration for a neutral atom of selenium and Beryllium is as follows:

  • Selenium:
  • Beryllium:

What is meant by Electronic configuration?

Electronic configuration may be defined as the process through which electrons are systematically arranged in numerous orbitals around an atomic nucleus. Electron configurations of atoms significantly follow a standard inscription in which all electron-containing atomic subshells.

According to the context of this question, the atomic number of selenium is 34. It is a member of group 16 of the modern periodic table. It possesses valence electrons of 6. While on the other hand, beryllium has an atomic number of 4. It is a member of group 2 and period 2 of the modern periodic table.

Therefore, the electronic configuration for a neutral atom of selenium and Beryllium is well described above.

To learn more about Electronic configuration, refer to the link:

brainly.com/question/26084288

#SPJ2

Se
1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^4
Be
1s^2 2s^2

MIDDLE SCHOOL

Fill in the blanks to complete each statement about weathering Weathering is the breakdown of rocks into smaller particles called
weathering is when rocks are physically broken into smaller pieces, but the minerals in
the rock remain the same.
When a rock is broken down in a way that changes the mineral composition, it is called
weathering

Answers

The blanks about Weathering in the question are filled as follows;

  • Sediment
  • SedimentMechanical/Physical
  • SedimentMechanical/PhysicalChemical

According to the question;

  • We are required to fill in the blanks to complete each statement about Weathering.

For Statement 1:

  • Weathering is the breakdown of rocks into smaller particles called Sediment.

For Statement 2;

  • When rocks are physically broken into smaller pieces, but the minerals in
  • the rock remain the same, Such kind of weathering is termed Mechanical/physical weathering.

For Statement 3:

  • When a rock is broken down in a way that changes the mineral composition, it is called Chemical weathering.

Read more;

brainly.com/question/19448468

Answer:

Weathering is the breakdown of rocks into smaller particles called sediment (not sediments)

Mechanical weathering is when rocks are physically broken into smaller pieces, but the minerals in the rock remain the same

When a rock is broken down in a way that changes the mineral composition, it is called Chemical Weathering.

MIDDLE SCHOOL

WHAT IS PH???? My options are:
1. The negative logarithm of the hydrogen ion concentration
2. The positive logarithm of the hydrogen ion concentration
3. The negative logarithm of the hydroxide ion concentration
4. The positive logarithm of the hydroxide ion concentration


Thanks so much for the help in advance!

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PH INCLUDES ALL OF THE STATEMENT AND IT IS A SCALE WHICH CHECK THE ACIDIC AND BASIC BEHAVIOR OF SUBSTANCE OR SOLUTION

HIGH SCHOOL

How many moles of MgCl2 are there in 340 g of the compound?

Answers

To calculate the amount of the compound in the units of grams, we need to first obtain for the molar mass of the compound. We calculate as follows:

MgCl2 = 24.31 + (2 x 35.45) = 95.21 g/mol

340 g MgCl2 ( 1 mol / 95.21 g ) = 3.57 mol MgCl2

Hope this answers the question. Have a nice day.

Explanation:

Moles is defined as mass divided by molar mass.

Mathematically,          Number of moles = \frac{mass}{molar mass}[/tex]

Therefore, it is given that mass is 340 g and molar mass of is 95.211 g/mol.

Hence, calculate number of moles as follows.

                   Number of moles =

                                                 =

                                                 = 3.57 mol

Thus, we can conclude that there are 3.57 moles of MgCl2 are there in 340 g of the compound.

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The amount of energy needed to change a material from a solid to a liquid is heat of

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It revolves around Physical change.  I learned this in class today.

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What is the half-life of a 0.5 g sample of radioisotope that decayed to 0.125 g in 9.6 min?

Answers

25% remaining = 2 half-lives have passed,
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A solution that is 0.20 m in hcho2 and 0.15 m in nacho2 find ph

Answers

We are given
0.2 M HCHO2 which is formic acid, a weak acid
and
0.15 M NaCHO2 which is a salt which can be formed by reacting HCHO2 and NaOH

The mixture of the two results to a basic buffer solution
To get the pH of a base buffer, we use the formula
pH = 14 - pOH = 14 - (pKa - log [salt]/[base])

We need the pKa of HCO2
From, literature, pKa = 1.77 x 10^-4
Substituting into the equation
pH = 14 - (1.77 x 10^-4 - log 0.15/0.2)
pH = 13.87

So, the pH of the buffer solution is 13.87
A pH of greater than 7 indicates that the solution is basic and a pH close to 14 indicates high alkalinity. This is due to the buffering effect of the salt on the base.
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