A system absorbs 191 kJkJ of heat and the surroundings do 120 kJkJ of work on the system. Part A What is the change in internal energy of the system?

Answers

Answer 1

Answer: the change in internal energy of the system is 311 kJ

Explanation:

Given that;

A system absorbs a heat dQ = 191 kJ

And the the surroundings do work on the system dW = 120 kJ

change in internal energy of the system = ?

We take a look at the first law of thermodynamic

Initially the system absorbs energy ( dQ =1 91 kJ) as heat.

Then the surroundings do work (dW = 120kJ) on the system,

Hence the system gains 120 kJ more.

The total energy change is = heat + work

dU = dQ + dW

dU = 191 + 120

dU = 307 kJ

change in internal energy = 311 kJ

Therefore the change in internal energy of the system is 311 kJ


Related Questions

Which statement describes an example of a chemical property of a metal statue?
O It is metal.
O It can tarnish.
OIt is solid.
OIt is shiny.


Answers

Answer:

The answer is "it can tarnish"

Explanation:

The statement describes an example of a chemical property of a metal statue is that it can tarnish.

Chemical properties are defined as those properties which become evident during or after a chemical reaction  has taken place.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and used for building up chemical classifications.

The major chemical properties include flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

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In chemical reaction atoms are what?

Answers

Answer:

In chemical reaction atoms are reactants

23.1 g of HCl (a strong acid) is added to water to make 1250 mL of solution. Calculate [H3O+] and pH of the solution

Answers

Answer:

Following are the solution to this question:

Explanation:

[tex]\to HCl \ mol = \frac{23.1 \ g}{36.5 \frac{g}{mol}} = 0.633 \ mole\\\\\\\to HCl \ molarity = \frac{ 0.633 \ mole }{1.25 L} \\\\[/tex]

                            [tex]=0.5064 \ m[/tex]

 [tex]HCl +H_2O \longrightarrow H_3O^{+} + Cl^{-}\\\\\\[/tex]

[tex][H_3O^{+}] =[HCl] \\\\\to [H_3O^{+}] =0.5064 \ m \\\\\to PH =-\log [H_3O^{+}] \\\\[/tex]

          [tex]= -\log (0.5064)\\\\= 0.295 \\\\=0.3[/tex]

When the absolute value of the difference in electronegativity of two adjacent atom in a compound is 1, they are most likely bonded by:____________.
a. nonpolar covalent bond
b. a polar covalent bond
c. ionic bonding

Answers

Answer:

A polar covalent bond

Explanation:

When the absolute value of the difference in electronegativity of two bonded atoms is between 0.4 and 1.8 they tend to form polar covalent bonds.

Which cannot be chemically broken down into simpler substances?
O compound
O element
O solution
O mixture

Answers

Answer:

an element.

Explanation:

it is the purest form

Answer:

b

Explanation:

Many materials, such as rocks, expand (get larger) when they are heated and contract (shrink) when they are cooled. This change
in size can cause cracks to form and break large rocks into smaller pieces.
In this example, what is caused by heating and cooling?
OA. decay
ОВ.
weathering
OC.
erosion
OD
earthquakes

Answers

Answer:

OB: weathering

Explanation:

the cycle of heating and cooling causes stresses called thermal fatigue, this causes the material to break down. In hand, weathering is a physical and chemical process that causes rocks and minerals on the Earth's surface to break down and decompose. Therefore, this matches the process you have described.

Answer:

weathering fun way to imagen it: just imagen u saw ur worst enemie and pretende it is the rock and the wind and ice and water are ur best friends THEN BAM wind and ice and water(ur best friends) make the rock(worst enemie) to dust :D

3. Theoretically how many grams of magnesium is required to produce to 5.0 g of

Magnesium oxide?

Answers

Answer:

3grams

Explanation:

The reaction for the production of Magnesium dioxide will be

Mg + O2  → MgO

we have 5g of MgO (molar mass 40g)

no of moles of MgO = 5/40 = 0.125

Using unitary method we have

1 mole of Mg require 1 mole of MgO

0.125 Mole of MgO = 0.125mole of Mg

n = given mass /molar mass

0.125 = mass / molar mass

mass = 0.125* 24 = 3grams

in which beakers are the particles moving the most slowly

Answers

Answer:

A and D

Explanation:

Mr. Juan is husband of Maria, before they get married Maria knows that her husband cannot make a baby since he cant produce sperm. But during their 2 years in marriage, Maria got pregnant. Is Juan can file a case to Maria? What it is? Support your answer?​

Answers

Answer:

yes but first he need to check himself

Explanation:

bcoz if he cannot produce a sperm than she might have cheated him and the baby might be of someone other.

A solid substance was tested in the laboratory. The test results are listed below: 1.) dissolves in water 2.) is an electrolyte 3.) melts at a high temperature. Based on these results, the solid substance could be

Answers

Answer:

NaCl may be i guess so....

Every element in group one has ______________ electron in its outer shell. Every element in group two has _______________ electrons in its outer shell.

need help

Answers

Every element in group one has 1 electron in its outer shell. Every element in group 2 has 2 electrons in its outer shell

Balance the following equation.
C3H8(g) + O2(g) → CO2(g) + H2O(l)

Answers

Explanation:

C3H8+5O2----->3CO2+4H2O

Answer:

C3H8+5O2----->3CO2+4H2O

Explanation:

A solution is made by adding 5.01 g of iron sulfate to 75.3 g of water. What is the mass percentage of iron sulfate in this solution?

Answers

Answer:

6.24 % of FeSO₄

Explanation:

Solute mass: 5.01 g of FeSO₄

Solvent mass: 75.3 g of water

Solution mass = solute mass + solvent mass

5.01 g + 75.3 g = 80.31 g

We can apply a rule of three. Mass percentage means the mass of solute which is contained in 100 g of solution. Then,

In 80.31 g of solution we have 5.01 g of solute

In 100 g solution, we may have (5.01  . 100)/ 80.31 = 6.24 g of solute.

This is the mass percentage: 6.24%

Three isotopes of argon occur in nature. Calculate the average atomic mass of argon given the following relative atomic masses and abundances of each of the isotopes.

Isotope Relative Atomic Mass Abundance
Ar-36 35.97 amu 0.337%
Ar-38 37.96 amu 0.063%
Ar-40 39.96 amu 99.600%
a
35.97 amu
b
37.95 amu
c
39.95 amu
d
38.96 amu

Answers

Answer:

whats the question

Explanation:

Answer:

Calculate the average atomic mass of argon to two decimal places, given the following relative masses and abundances of each of the isotopes: argon-36 (35.97 amu; 0.337%), argon-38 (37.96 amu; 0.063%), and argon-40 (39.96 amu; 99.600%). ... So the atomic mass of Ar is 0.99639. 96 + 0.0006337. 96 + 0.00337*35.97 = 39.957.

Explanation:

hope this help

Elements in the same period have _____ in common?


-

Answers

Answer:

The elements that have the same number of energy levels or the orbitals.

Explanation:

They have he same number -- energy levels

why does 3-methylcyclohexene elute before
1-methylcyclohexene in gas chromatography?

Answers

Answer: The mole percent of 1-methylcyclohexene was 80.21% and the mole percent of 3-methylcyclohexene was 19.79%. This is because 1-methylcyclohexene is the major product with the more stable carbocation intermediate and 3-methylcyclohexene is the minor product with the less stable carbocation intermediate.

Explanation: The mole percent of 1-methylcyclohexene was 80.21% and the mole percent of 3-methylcyclohexene was 19.79%

Calculate the mass of zinc that reacts with 16.23 g of hydrochloric acid to form 15.2 g of zinc chloride and 18.97 g of hydrogen gas

Answers

Answer:

17.94 g

Explanation:

Which of the following belong to a category called the main group of elements
A halogens
B nonmetals
C alkaline metal
D transition elements

Answers

Answer:

C. Alkaline Metal ok thanks

C I hope it helps rkjnjjrnbejjje

Luca made the following chart for Earth’s four basic movements. What needs to be correct on his chart

Answers

Answer:

The solar system speed and Milky Way speed should be switched

Explanation:

Answer:

Explanation:

The solar system speed and Milky Way speed should be switched

In the electron dot diagram for sulfur monoxide, each atom of sulfur will have how many unshared pairs of electrons an each atom of oxygen will have how many unshared pairs of electrons.​

Answers

Answer:

Both sulphur and oxygen have two unshared pairs of electrons

Explanation:

The compound sulphur monoxide has the formula S=O. It is quite analogous to the diatomic molecules of the group 16 elements.

We must remember that each group element has six electrons in their outermost shell. Two of these are lone pairs leaving only two electrons available for bond formation.

These two electrons are used to form the sigma and pi bonds in S=O, leaving two lone pairs on each of sulphur and oxygen atoms.

The hybrid orbital set used by the central atom in no3- is_____ and why?

a. sp
b. sp3
c. SP2
d. sp3d2
e. sp3d

Answers

Answer:

c. SP2

Explanation:

The image in the diagram below shows the structure of  NO₃⁻

Nitrogen is the central atom with the electronic configuration of 1s² 2s² 2p³.

So in its outermost shell, it has 3 electrons and the hybridization is sp²

However,

According to Hund's rule:

The ground state of Nitrogen is;    

1s²    2s²   2p³

↑↓     ↑      ↑  ↑  ↑

At the excited state when it is attached to 3 different oxygen ions, we have:

                1s²     2s²        2p⁵

O⁻ --->     ↑↓      ↑↓     ↑↓    ↑↓   ↑      

                1s²     2s²        2p⁵

O⁻ --->     ↑↓      ↑↓     ↑↓    ↑↓   ↑

                1s²     2s²        2p⁴

O⁻ --->     ↑↓      ↑↓     ↑↓    ↑   ↑

Thus, the 3 sp² orbital lies in a plane and form 3 N - O σ- bond and one π- bond.

How many atoms of phosphorus are in 5.70 mol of copper(II) phosphate?​

Answers

Answer:

Cu3 (PO4)2 contains a total of 2 atoms of phosphorus in just one molecule. (2.10 mol)(6.02214 x 10^23 atoms / mol)(2 phosphorous) = 2.53 x 10^24 atoms of phosphorous per molecule of copper i

Explanation:

What name is given to the elements that appear in the right-most column of the periodic
table?
- Alkali metals
- Alkaline earth metals
- Transition metals
- Noble gases
(NOBLE GASES IS ANSWERR)

Answers

Answer:

Noble gases... (You already know...)

Explanation:

The right-most column of the periodic table contains atoms with full electron shells, also known as Noble Gases.

Hope this helped!

Answer:

Noble gases

Explanation:

The six elements listed in the last column of the table (Group 18) of the periodic table are collectively referred to as the noble gases. All of the noble gases have the maximum number of electrons possible in their outer shells (two electrons in helium’s outer shell, and eight electrons for all the others), making them stable.

Draw the product or products that are obtained from the reaction of HCl with 1-butene and with 2-butene. Show the relative stereochemistry if the product has two or more stereocenters.

Answers

Delete me please!!!!!!

The properties of compund are different from the properties of their constituenr​

Answers

Answer: Atoms of carbon and hydrogen

Explanation:

What are three ways that we can identify when a chemical reaction is occurring?

Answers

Three ways (out of the many) are:

Change of temperature
Color change
Formation of gas

Hope this helps!! (:

Suppose you are titrating vinegar, which is an acetic acid solution, of unknown strength with sodium hydroxide according to the equation HC2H3O2 + NaOH → H2O + NaC2H3O2 If you require 32.17 mL of 0.116 M NaOH solution to titrate 10.0 mL of HC2H3O2 solution, what is the concentration of acetic acid in the vinegar? (M)

Answers

Answer:

0.373 M

Explanation:

The reaction is

HC₂H₃O₂ + NaOH → H₂O + NaC₂H₃O₂

So 1 mol of acetic acid reacts with 1 mol of sodium hydroxide.

First we calculate the moles of NaOH:

0.116 M * 32.17 mL = 3.732 mmol NaOH

Because the stoichiometric ratio is 1:1 :

3.732 mmol NaOH = 3.732 mmol Acetic Acid

Now we calculate the concentration of acetic acid, dividing the moles by the volume:

3.732 mmol Acetic Acid / 10.0 mL = 0.373 M

32.17 mL of 0.116 M NaOH are required to titrate 10.0 mL of 0.373 M acetic acid.

What is titration?

Titration is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte.

Let's consider the neutralization reaction between acetic acid and sodium hydroxide.

HC₂H₃O₂ + NaOH → H₂O + NaC₂H₃O₂

We can calculate the concentration of acetic acid in vinegar using the following expression.

Ca × Va = Cb × Vb

Ca = Cb × Vb / Va

Ca = 0.116 M × 32.17 mL / 10.0 mL = 0.373 M

where,

Ca is the concentration of the acid.Va is the volume of the acid.Cb is the concentration of the base.Vb is the volume of the base.

32.17 mL of 0.116 M NaOH are required to titrate 10.0 mL of 0.373 M acetic acid.

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calculate the (m/v) of nacl of a solution made by diluting 25.0 ml of a 7.50 (m/v)% NaCl solution to a total volume of 75.00 ml

Answers

Answer:

2.5%

Explanation:

Given

M1 = 7.50%

M2 = ?

V1 = 25.0mL

V2 = 75.00mL

M1V1=M2V2

7.5x25=M2x75

M2=2.5%

The NaCl of a solution made by diluting 25.0 ml of a 7.50 (m/v)% NaCl solution to a total volume of 75.00 ml is 2.5 (m/v)%.

What is solution?

Solution is defined as a continuous variation of two or more substances in their relative proportions up to what is known as the limit of solubility.  A solute is the name for the substance that dissolves to create a solution. A solvent is the material that a solute will dissolve in. Sugar is the solute and water is the solvent in a sugar-water solution.

To calculate the molarity of NaCl

We use M1V1 = M2V2

Given M1 = 7.50 (m/v)%

V1 = 25.0 ml

V2 = 75.0 ml

M2 = M1 V1 / V2

M2 = 7.50 x 25.0 / 75.0

M2 = 2.5 (m/v)%

Thus, the NaCl of a solution made by diluting 25.0 ml of a 7.50 (m/v)% NaCl solution to a total volume of 75.00 ml is 2.5 (m/v)%.

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if you a boy answer this question because............. idk

Answers

Answer:

no

Explanation:

What is the answer? Please

Answers

Answer:

Cell

Explanation:

I just passed this unit a month ago.

Answer:

It is 6. Cell

Explanation:

Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.

I really hope this helped. God bless you and have a great day! :-)

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