What is known about a reaction with a positive enthalpy?

Answers

Answer 1

Answer:

"Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings of the reaction."

Explanation:

Answer 2

When enthalpy is positive and delta H is greater than zero, this means that a system absorbed heat. This is called an endothermic reaction. When enthalpy is negative and delta H is less than zero, this means that a system released heat. This is called an exothermic reaction.

What does a high positive enthalpy mean?

The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.

Learn more about the endothermic reaction here: brainly.com/question/6506846

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Related Questions

. The Ksp of barium sulfate is 1.1 × 10–10. What is the sulfate-ion concentration of a 1.0-L saturated solution of BaSO4 to which 0.025 mol of Ba(NO3)2 is added? 4.4 × 10–9M 1.0 × 10–5M 6.6 × 10–5M 2.8 × 10–12M

Answers

Answer:

[tex][SO_4^{2-}]=4.4*10^{-9}M[/tex]

Explanation:

From the question we are told that:

[tex]Ksp=1.1*10^{-10}[/tex]

Volume of [tex]SO_4^{2-}=1.O[/tex]

Moles of  [tex]Ba(NO_3)^2 =0.025[/tex]

Generally the equation for Ksp is mathematically given by

[tex]Ksp=[Ba^{2+}][SO_4^{2-}][/tex]

[tex]1.1*10^{-10}=[0.025][SO_4^{2-}][/tex]

Therefore

[tex][SO_4^{2-}]=4.4*10^{-9}M[/tex]

Is this population more likely to grows slowly or quickly in the next 10 years

Answers

nobody can say it is uncertain but in my opinion it will grow quickly in the next 10 years

Please help me
will give the brainliest!​

Answers

Explanation:

a) The presence of sulfate ions in a solution can be confirmed by the reaction of barium chloride in an acidic medium.

The balanced chemical equation of the reaction is shown below:

[tex]BaCl_2(aq)+CuSO_4(aq)->CuCl_2(aq)+BaSO_4(s)[/tex]

Hence, the white precipitate is barium sulfate and its formation with the ionic equation is shown below:

[tex]Ba^2^+(aq)+SO_4^2^-(aq)->BaSO_4(aq)[/tex]

b) The presence of copper (II) ions can be confirmed by the following test:

Add potassium iodide solution to copper (II) solution.

Then a white ppt of cuprous iodide along with the liberation of iodine is observed and the entire solution attains brown color.

The chemical equation of the reaction is shown below:

[tex]2CuSO_4(aq)+4KI(aq)->Cu_2I_2(s)+I_2(s)+2K_2SO_4(aq)\\[/tex]

c)(i)Due to this reaction, the blue color of the solution becomes white.

Reddish-brown copper is deposited at the bottom of the container.

(ii)In this reaction, zinc is oxidized.

d) (i) Copper is produced at the cathode.

(ii)[tex]Cu^2^+(aq)+2e^-->Cu(s)[/tex]

(iii) The reaction that takes place at the cathode is reduction.

Reduction is gaining of electrons.

Over a period of 2 minutes, 180 coulombs of charge pass through a resistor. What is the current through the resistor during this time?
Type the correct answer in the box. Use numerals instead of words.
The current through the resistor during this time is

A.

Answers

Answer:

Explanation:

Formula

The current = charge / time

The charge is in coulombs

The time has to be in seconds.

1 minute = 60 seconds

2 minutes = 120 seconds.

charge = 180 coulombs

current = 180 / 120

current = 1.5 amperes.

option with explaination

Answers

Answer:

B. it's water of crystallization.

the water of crystallization, that is the number of molecules of water attached to One Copper atom gives blue color to the hydrated salt (CuSO4.5H2O)

Calculate the volume (in L) that 3.25 mol of helium gas will occupy at a temperature of 25.0 °C and a pressure of 799 mm Hg.

Answers

Answer:

V = 6.34 L

Explanation:

Given that,

Number of moles of Helium gas, n = 3.25 mol

Temperature, T = 25 °C = 298 K

Pressure, P = 799 mm Hg

We know that,

PV = nRT

Where

R is the gas constant, R = 62.4 L-mm Hg/mol K

So,

[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{3.25\times 62.4\times 25}{799}\\\\V=6.34\ L[/tex]

So, the volume of the gas is 6.34 L.

A pupil has drawn the electronic structure of fluorine and the diagram is shown below. However,
mistakes have been made. State three mistakes that have been made.

Fl atomic number: 9
Fl atomic mass: 10

(ps i have two of these but can’t figure out the last)

Answers

Answer:

The number of electrons in the orbit is wrong they have to be 9 and not 10since flourine is in group 7 the number of electrons in the outer most shell has to be 7 and not 2the first shell has 8 instead of 2 electrons

I hope this helps

Hiii pls help me to write out the ionic equation ​

Answers

Answer:

STEP I

This is the balanced equation for the given reaction:-

[tex] 2KOH_{(aq)} + H_2SO_4{}_{(aq)} \rightarrow K_2SO_4{}_{(aq)} + 2H_2O_{(l)} [/tex]

STEP II

The compounds marked with (aq) are soluble ionic compounds. They must be

broken into their respective ions.

see, in the equation KOH, H2SO4, and K2SO4 are marked with (aq).

On breaking them into their respective ions :-

2KOH -> 2K+ + 2OH-H2SO4 -> 2H+ + (SO4)2-K2SO4 -> 2K+ + (SO4)2-

STEP III

Rewriting these in the form of equation

[tex] \underline{\pmb{2K^+} }+ 2OH^- + 2H^+ + \pmb{\underline{{SO_4{}^{2-}}} \: \rightarrow \: \underline{\pmb{2K^+}}} + \underline{\pmb{SO_4{}^{2-}}} + 2H_2O [/tex]

STEP IV

Canceling spectator ions, the ions that appear the same on either side of the equation

(note: in the above step the ions in bold have gotten canceled.)

[tex] \boxed{ \mathfrak{ \red{ 2OH^-{}_{(aq)} + 2H^+{(aq.)} \rightarrow H_2O{}_{(l)}}}} [/tex]

This is the net ionic equation.

____________________________

[tex] \\ [/tex]

[tex]\mathfrak{\underline{\green{ Why\: KOH \:has\: been\: taken\: as\: aqueous ?}}} [/tex]

KOH has been taken as aqueous because the question informs us that we have a solution of KOH. by solution it means that KOH has been dissolved in water before use.

[Alkali metal hydroxides are the only halides soluble in water ]

Name each compound. Do not capitalize element names. An example can be seen
below.
Ex. SF6: sulfur hexfluoride
a. H2O:
b. PC15:
C. SiF4:
d. N20

Answers

Answer:

a. H2O: dihydrogen monoxide

b. PCl5: Phosphorus pentachloride

c. SiF4: Silicon tetrafluoride

d. N20: dinitrogen oxide

Is FeS iron (ll) sulfide or iron (lll) sulfide?

Answers

Answer:

the valence of S is -2. For FeS to be neutral the valence of Fe used must be +2

and since Iron (II) has its valency 2, FeS will be Iron (II) Sulfide.

How are the vapor pressure and boiling point of alkynes affected as the chain length increases?

Answers

Answer:

Answer to the following question is as follows;

Explanation:

Alkynes' vapour pressure and normal boiling points are altered when chain length grows, since vapour pressure rises while boiling point falls.

Vapour pressure always include pressure entered by vapour with its condensed phase, pressure include molecules force of attraction include vapour

How many moles of KOH are there in 27.5 mL of 0.250 M KOH?

Question 2 options:

4.31 × 10−3 mol KOH


6.88 × 10−3 mol KOH


7.24 × 10−3 mol KOH


8.13 × 10−3 mol KOH


9.21 × 10−3 mol KOH

Answers

Answer:

6.88 × 10^-3mol

Explanation:

Molarity = number of moles (n) ÷ volume (V)

According to this question, there in 27.5 mL of 0.250 M KOH, the number of moles of KOH can, therefore, be calculated as follows:

number of moles = molarity × volume

Volume of KOH = 27.5mL = 27.5/1000

= 0.0275L

n = 0.0275 × 0.250

n = 0.006875 mol

n = 6.88 × 10^-3mol

what is the molarity of HCL solution that has a density of 1.17g/ml at 25°?​

Answers

~Solution :-

Here, we have been given that;

$ \bf{1 ml}$ = 1.17 g$ \bf{1 l}$ = 1170 g

Hence, we can note that,

No. of moles of HCL (n) = $ \sf{\frac{1170}{36.5}}$

(n) = 32.05

[tex] \\ [/tex]

Thus,

Molarity = 32.05 mg/L

Hence, molarity of the given solution will be 32.05 mg/L.

HELP ME PLZ Which of the following describes the structure of a fish's swim bladder?
A. Expands and contracts to allow the fish to rise or sink in the water
B. Internal organ filled with liquid
c. Holds urine until it can be released into the environment
D. Internal organ filled with air sacs​

Answers

A: Swim bladder, also called air bladder, buoyancy organ possessed by most bony fish. The swim bladder is located in the body cavity and is derived from an outpocketing of the digestive tube. It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the fish to maintain its depth without floating upward or sinking. It also serves as a resonating chamber to produce or receive sound. In some species the swim bladder contains oil instead of gas. In certain primitive fish it functions as a lung or respiratory aid instead of a hydrostatic organ. The swim bladder is missing in some bottom-dwelling and deep-sea bony fish (teleosts) and in all cartilaginous fish (sharks, skates, and rays).
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Teleost fish in cross section.


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Related Topics: Baroreception
The Editors of Encyclopaedia Britannica
This article was most recently revised and updated by Adam Augustyn, Managing Editor, Reference Content.
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skeleton: Buoyancy devices
…or forward, end of the swim bladder to the auditory organs of the head. Sound vibrations cause changes...…
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BLADDER

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BY The Editors of Encyclopaedia Britannica View Edit History
FULL ARTICLE
Bladder, membranous sac in animals that serves as the receptacle of a fluid or gas. See gallbladder; swim bladder; urinary bladder.
Related Topics: Bladder cancer Urinary bladder Swim bladder Ureter
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gallbladder; bile ducts
gallbladder
Gallbladder, a muscular membranous sac that stores and concentrates bile, a fluid that...…
Teleost fish in cross section.
swim bladder
Swim bladder, buoyancy organ possessed by most bony fish. The swim bladder is located...…
male urinary bladder and urethra
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plz answer (g) i will give rating 5 and thanks who answer plz fast

Answers

Answer:

Like many common group 2 metal carbonates, magnesium carbonate reacts with aqueous acids to release carbon dioxide and water

 MgCO3 + 2 HCl → MgCl2 + CO2 + H2O.

The procedure to obtain pure magnesium chloride from the reaction is as thus

Step 1: Reaction

- Leave the dilute hydrochloric acid in a beaker.

- Add Magnesium carbonate slowly until it is in excess or until no more gas seem to be getting liberated.

Step 2: Filtration

- Filter with filter paper and funnel.

- Filter off the excess magnesium carbonate as magnesium chloride will be in aqueous form (liquid) and will come out with the filtrate. The residue is the excess magnesium carbonate.

Step 3: Crystallization to obtain solid crystals from the filtrate.

- Pour filtrate solution into evaporating dish/basin

- Provide heat using Bunsen burner

- Pour solution into an evaporating basin and heat over a water bath

- Stop heating when crystals start to form

allow water to evaporate until pure crystals remain.

- Dry crystals using absorbent paper or warm oven.

Precautions

- Use personal protective equipment such as gloves, a lab coat and wear eye protection, especially when heating.

- Avoid inhaling unnecessary gases during the whole process.

how much energy is required to melt 2kg of aluminium

Answers

800kj----------




800kj----------

Which element has 2 valence electrons in the 2s sublevel?

Answers

Answer:

beryllium is the answer.

I hope this will help you

Draw the following structures and name them :
I. CH3CH2(OH)
II.CH3CH2CH(CH3)C(Cl)2C(l)2CH(F)OH
III.CH3CH(CH3)CHO
IV.CH2=CH(OH)
V.CH3OCH2CH3

Answers

Answer:

hope this helps.answer is in the picture

An organic compound has the empirical formula C2H4O. what is the compound?

a. butanoic acid
b. butanol
c. ethanoic acid
d. ethanol

Answers

Answer:

The correct answer is - butanoic acid

Explanation:

An empirical formula is the general formula or base formula that is the simplest positive integer ratio of atoms present in a compound. The empirical formula is specific to specific compounds or types of compounds.

Among the given options, the empirical formula C2H4O is butanoic acid as the molecular formula of butanoic acid is - C4H8O2 which is multiple of C2H4O. Other compounds have different than this empirical formula.

What is the name of the molecule shown below?

A) ethanol
B) ethanal
C) ethanoic acid
D) ethylamine

Answers

The answer is B, Ethanal

The name of the molecule shown is Ethanol.

What is Ethanol?

Ethanol is a alcoholic substance that is formed from fermentation of glucose in the presence of yeast or microorganisms.

It has a chemical group that have methyl group, hydroxyl group OH which is bonded to carbon atom.

Therefore, The name of the molecule shown is Ethanol.

Learn more about ethanol below.

https://brainly.com/question/13423304

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Which pair of substances would react the
fastest?
a. Copper sheet and concentrated
nitric acid.
b. Copper powder and dilute nitric acid
C. Copper powder and concentrated
nitric acid.​

Answers

Answer:

C. It has the highest rate of reaction. Copper has the highest TSA/V and concentrated nitric acid has huggest num of solute

I need help with question 5

Answers

Answer:

B a spring being stretched

Plants in forests take up carbon dioxide from the atmosphere during photosynthesis. They transform the carbon dioxide into plant material. When plants die, their organic matter is often worked into the soil by decomposers. Some of this organic matter remains within the soil and forest floor, and some of it is taken up by other living things.

Based on this information, what role do forests play in the carbon cycle?
A.
Forests are carbon sinks because they store carbon.
B.
Forests are carbon sinks because they do not absorb carbon dioxide when plants die.
C.
Forests are carbon sources because they emit carbon.
D.
Forests are carbon sources because they can be burned to emit carbon dioxide.

Answers

Answer is A

Because Trees store carbon and make it oxygen

Answer: B. forests are carbon sinks because they store carbon

Explanation:forests take up carbon from the atmosphere through photosynthesis and from organic matter through decomposition. so, forests are carbon sinks because they store carbon

Which is another word for 10 meters in the metric system?

Answers

Answer:

Dekameter

Explanation:

QUICK CHECK
Use the periodic table to select which type of bond is present and which of the listed properties is most
likely for each substance.
Substance
Type of bond
Likely property
A А
B
A
Cuzm
Ba
lonic
DO
covalent
02
С
D
metallic

Answers

Answer:

Coppell zinc,ironic bond

Explanation:

lt will give away two zinc atoms

Answer:

I will go with Sodium chlorine NaCl

True or false, The universal gas constant, R, is . 0821 when we use mm Hg as our unit for pressure

Answers

Answer:

False

Explanation:

R = gas constant = 0.0821 atm•L/mol•K

What is the percent yield of a reaction?
O A. The difference between measured and calculated amounts
OB.
The amount of produd obtained
amount possible
* 100
C. The amount of product actually obtained in a reaction
D. The amount of product that is possible from a reaction

Answers

Answer:

B. The amount of produd obtained/amount possible * 100

Explanation:

In chemistry, the yield of a chemical reaction is the quantity or amount of products obtained in that chemical reaction. It is calculated by using the following formula:

Percentage yield = Actual yield/theoretical yield × 100

- The actual yield is the amount of products got from a chemical reaction

- The theoretical yield is the amount of product got from using the balanced equation (stoichiometry).

HELLO EVERYONE PLEASE I NEED HELP WITH

Please I REALLY NEED A HELP WITH THIS PLEASE HELP ME

THIS HARRY POTTER LITERARY ESSAY
OUTLINE


1. Love and Friendship is a central theme in Harry Potter and the Philosopher's Stone. Prove that this statement is true using 2(two) different characters from the novel as examples.


Introductory Statement/ Hook:



Statement of Intent: reason A and B :



thesis reason A and B:



BODY PARAGRAPH



#1 Point #1: Introduce REASON A here, but use general statement



#1: Provide quotations from the novel to support Reason A



Explanation #1:


Proof #2:


Explanation #2:



BODY PARAGRAPH


#2 Point #2: Introduce REASON B here, but use general statements


#1: Provide quotations from the novel to support ReasonB



Explanation #1:


Proof #2:


Explanation #2:



CONCLUSION


Restate/ Summarize Thesis:


Restate/ Summarize Points:

Answers

Answer:

Ron and Hermoine

Explanation:

They always fought over petty things, but at the end, they did end up together!

(Answer for your question about love and friendship being a central theme in Harry Potter and the Philosopher's stone)

*ALSO, MY ANSWER MIGHT BE WRONG* so be sure to use a pencil just in case!

What happens if kinetic energy of a gas is lowered

Answers

Answer:

"If you lower the kinetic energy of a gas its temperature will decrease because temperature is a measure of the average kinetic energy of a substance."

Explanation:

it’s temperature will decrease

Explanation: because temperature is a measure of the average kinetic energy and its substance

CORRECT ANSWER ONLY ND WILL GIVE BRAINLIEST✌
Calculate the mass of nitrogen dioxide gas that would occupy
the same volume as 10g of hydrogen gas at ē same pressure and temperature
(H= 1.0 N = 14.0 O= 16.0) GAS LAWS/MOLES

Answers

Answer:

150g

Explanation:

Assuming they are ideal gases at the same temperature and pressure, equal moles of gasses have equal volume. IN this case, if we have 10g of hydrogen gas, that is 5 moles of H2 gas. That means 5 moles og NO2 will occupy the same volume which is 5*(14.0 + 16.0*2) =  230 g

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