For the chemical reaction H2 + CO2 → H2O + CO, the energy contained in the reactants is 394 kJ, and the energy contained in the products is 352 kJ, assuming 1 mol of each substance is present. Which of the following statements is true?
A. 42 kJ is released, and the reaction is exothermic.
B. 42 kJ is absorbed, and the reaction is exothermic. C. 42 kJ is absorbed, and the reaction is endothermic. D. 42 kJ is released, and the reaction is endothermic

Answers

Answer 1

C.
Because the amount of energy in the products is less than that of the reactants, the reaction is endothermic. Endothermic reactions use up, or absorb energy.

Related Questions

What evidence do scientists have that Earth has been hit by large objects, like asteroids, in the past? Check all that apply.

Answers

I have attached a screenshot of the question and its options.

Answer:
layer of burned organic matter
change in average global temperature
mass extinctions

Explanation:
Asteroids are external rocks/objects that hit the surface of the earth.
Let's check the options:
1- layer of volcanic ash: This option is rejected as volcanoes are caused as a result of the internal heat and combustion in the layers of the earth. Therefore, volcanoes are independent of external bodies as asteroids.

2- layer of burned organic matter: This option is accepted. When bodies , as asteroids, hit the earth, their clash with the earth's surface usually lead to burns and/or fires leading to layers of burnt organic matter that is found on the surface of the earth and its underlying layers.

3- change in average global temperature: This option is accepted as these bodies usually have different temperatures than that of the earth's climate. Therefore, when they penetrate the earth's atmosphere, they can lead to a change in the global temperature.

4- mass extinctions: This option is accepted as the collision of these bodies with the earth's surface can lead to destruction of creatures/objects which may lead to mass extinctions.

5- earthquake activity: This option is rejected as earthquakes are formed as a result of the motion of plates within the layer's of the earth and not as a result of external bodies.

Hope this helps :)

how many liters of laughing gas are in 0.98 moles stp

Answers

3H2 + N2 ===> 2NH3

GIVEN: 44.8 L of H2 at STP.

answer: mols of N2.

By applying ideal gas equation,

[tex]P\times V=n\times R\times T[\tex]

Where, P= pressure of gas

V=volume of gas

R=Gas constant

n=Number of moles of gas

T=Temperature

At STP, each gas has a defined value of pressure, volume and temperature.

P= 1 atm

R=0.0821 L atm mol⁻¹ K⁻¹

T= 0°C or 273 K

Putting all the values in the equation will give:

[tex]1\times V=0.98\times 0.0821\times 273[\tex]

V = 22 L

So the answer is 22 L.

what is the molecular formula of compound x?

Answers

Since there is one carbon with 4 Fluorines attached to it, and both compounds are no metals, we use the covalent method for naming,

Here we ignore the prefix for the first element if it is 1. Mono. Then pay attention to the second one, it would be tetra, because tetra means 4. Here there are 4 fluorines.

Drop ine and place ide

CF4 = carbon tetrafluoride.

Through which of the following processes is carbon directly transferred between living organisms and the environment?

Answers

Answer:

The answer is carbon cycle.

Explanation:

The carbon cycle is an important process for living organisms. As plants prepare their food through photosynthesis and is also an important source of fossil fuels for human activities.

Therefore carbon atoms are regenerated again and again in the carbon cycle process. This recycling process takes place between livings and nonliving things in the environment and also within the earth biosphere.

Abundance supply of carbon is necessary to carry out the biological processes. The entire carbon cycle is actually made up of sourced and sinks elements.

Helpp pleaseeeeeeeee

Answers

5 pm because she has to go 30 miles and she is only going -10 miles oer hour, which means in three hours she will het there

Answer:

The Sarah will arrive at 5.00 P.M..

Explanation:

Distance covered by Sarah = D = 30 miles

Time taken by Sarah to travel 30 miles = T

Speed by which Sarah cycling = S = 10 mile/hr

[tex]Speed=\frac{Distance}{Time}[/tex]

[tex]Time = \frac{Distance}{Speed}[/tex]

[tex]T=\frac{30 mile}{10 mile/hr}=3 hr[/tex]

Sarah will reach her grandmother's house in 3 hours.

If she leaves the home at 2.00 P.M. ,then she will reach at her grandmother's house by 5.00 P.M..

Will mark as Brainliest.

Which of the following is an exothermic reaction?

melting ice

dissolving ammonium nitrate in water to cool the water

dissolving sugar in water

condensation

Answers

It is condensation, it is the answer.

Carbohydrates are made up of three of the six major molecules found in living things. The general chemical formula for a carbohydrate is CH2O. Which elements combine to make a carbohydrate? Explain why the answer is correct. A. copper and colbat B. chlorine and oxigen C. carbon, helium and oxygen D. carbon, hydrogen and oxygen. Please answer ASAP

Answers

The answer i think is D

D.Carbon,Hydrogen and oxygen.

In carbohydrates, six atoms of carbohydrates, twelve atoms of hydrogen and six atoms of oxygen combine to get a typical formula C6H12O6..
But here you just made it easier so here 1 atom of carbon ,2 atoms of hydrogen and 1 atom of oxygen combine to form a general formula CH2O.....

HOPE IT HELPS YOU '_'

HQ5.49 Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction: 2 H 2 S(g) + 3 O 2 (g) → 2 H 2 O(l) + 2 SO 2 (g) ΔH ∘ rxn

Answers

Answer is: the standard enthalpy of reaction is -1124,2 kJ/mol.
ΔHf(H₂S) = -20.5 kJ/mol
ΔHf(O₂)=0 kJ/mol.
ΔHf(H₂O) = -285.8 kJ/mol.
ΔHf(SO₂) = -296.8 kJ/mol.
ΔHrxn = ∑ΔHf (products of reaction) - ∑ΔHf (reactants).
ΔHrxn - enthalpy change of chemical reaction.
ΔHf - enthalpy of formation of reactants or products.
ΔHrxn = (2 · (-285,8) + 2 · (-296,8)) - (2 · (-20,5)) · kJ/mol.
ΔHrxn = -1124,2 kJ/mol.

which of these are the largest? asteroids, comets, meteors, or are they all the same size?

Answers

comeys because meteors once they enter earths atmosphere it dissolves

Answer:

most likly comets but could be asteroids

Explanation:

hope it helps sorry the there wrong depeest apologise thanks

Explain why the following statements are true:
1) All matter is made up of atoms.
2) An electron with a proton equals a neutral charge.
3) All atoms are in constant motion.
please explain using complete sentences and will give brainliest to the best answer
PLEASE EXPLAIN ALL OF THE CHOICES!!!!! THX

Answers

1.Atoms combine to form molecules which in turn are what makes up matter.

2.Electrons carry negative charges and protons carry positive charges. While protons have far more mass the number of protons and electrons in a stable atom is the same. These charges cancel each other out. If there is an imbalanced then the atom is radioactive and decays until it reaches stability.

3.According to the kinetic theory of matter, "All matter is made up of atoms and molecules that are constantly moving. When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases."

What is a physical property of water?
A) liquid at room temperature
B) not flammable
C) pH of 7
D) reacts with sodium

Answers

A is the only physical property. A physical property is one that does not involve another chemical or element.

a) liquid at room temperature

Can you please answer number 8 thanks

Answers

Well February 29 is a date that usually occurs every 4 years and this is called a leap year.This day is added to the your calendar in leaps years as a corrective measure because the Earth does not orbit the sun in precisely 365 days! hope it helps and have a great day!

Solar Nebula definition

Answers

solar nebula. noun. A large cloud of gas and dust from which the sun, planets, and other solar system bodies formed.

could always look it up XD

Final answer:

The solar nebula is the original rotating cloud of gas and dust that formed the solar system, which under its gravity collapsed to form the Sun at its center, with the remaining materials eventually forming the planets and other celestial bodies.

Explanation:

Definition of Solar Nebula

The term solar nebula refers to the vast, rotating cloud of gas and dust from which the solar system was formed about 4.5 billion years ago. This flattened cloud of cosmic raw material is the precursor to the sun and the planets in our solar system. As gravity caused the solar nebula to collapse, it became hotter and denser at its center, forming the Sun. The remaining material then coalesced into the planets, moons, and other bodies that orbit the Sun. Similarly, the Orion Nebula is a current example of a stellar nursery, where new stars and planets are being formed, likened to a contemporary analog of our own early solar nebula. Unlike the solar nebula which has completed its lifecycle, many young stellar nebulas or circumstellar disks can be observed today, reflecting various stages in the planetary formation process.

How will the arrangement of salt particles most likely change?

Answers

Answer:

Salt particles will diffuse and towards where it is less that is left !!

so your answer is A !! left through diffusion !!

Explanation:

As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato. Why did the iodine solution change color on the potato? A. The iodine evaporated into a gas. B. The iodine mixed with the colors of the potato so it looked black. C. The iodine burned the potato and turned it to ash. D. The iodine reacted with the potato to form a new substance.

Answers

D. I know this because i did the project 3 weeks ago.

Answer:

The iodine reacted with the potato to form a new substance.

Explanation:

What is the source of energy that is released in an exothermic reaction? what absorbs the energy that is released ?

Answers

Hello,

Here are your answers:

The proper answers to your questions are....

1. "Chemical bond energy is converted to kinetic energy"...... which causes it to release energy around its surroundings!

2. "Endothermic reactions"...... Endothermic reactions are the things that absorb the energy!

If you need anymore help feel free to ask me!

Hope this helps!

What device used to measure the heat transferred from one substance to another?

Answers

calorimeter. you do need a scale and thermometer to work WITH a calorimeter but it can't measure heat by itself.

How many milliliters are in 22 mm3?

Answers

fuf9chlbcoc cpchchlccpj hl hl hlxypcoyohcohchho. lh ohcgl vk .

Why are sound recordings needed to preserve sound information

Answers

Original instantaneous sound recordings are in need of special preservation care. Today many of these historical sound recordings are reaching the end of their life span.

I am not sure if you have any answer choices or not, but I will just try to give my own answer. Sound recordings are needed to preserve important info such as historical events. This is because audio is what I like to call "key evidence" or just proof that something happened. An example would be Martin Luther's speech. Someone could say that he said something completely different from what he actually said, and without a recording, we wouldn't actually know. Another reason for sound recordings would be songs and music. Without sound recordings, we wouldn't have songs to listen to all day and night. We would have to go to concerts in order to hear music. I am not sure if any of this helped or not. If it did, please let me know. If it did not, then I am truly sorry, for at this exact moment in time, I can think of no other answers for this question.

How many grams of He are present in 8.0 L of gas at STP

Answers

1600 grams.
Hop you enjoy.

1600 grams
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How many moles of BaSO4 are formed if 0.5 moles of Na2 SO4 react with 60 g of BaCl2? Na2 SO4 + BaCl2 → BaSO4 + 2NaCl

Answers

the balanced equation for the reaction is as follows
Na₂SO₄ + BaCl₂ ----> 2NaCl + BaSO₄
stoichiometry of Na₂SO₄ to BaCl₂ is 1:1
first we need to find out which the limiting reactant is
limiting reactant is fully used up in the reaction.

number of Na2So4 moles - 0.5 mol number of BaCl2 moles - 60 g / 208 g/mol = 0.288 mol
since molar ratio is 1:1 equal number of moles of both reactants should react with each other

therefore BaCl2 is the limiting reactant and Na2SO4 is in excess. amount of product formed depends on number of limiting reactant present.
stoichiometry of BaCl₂ to BaSO₄ is 1:1.

therefore number of BaSO4 moles formed - 0.288 mol

Answer: 0.29

Explanation:

[tex]Na_2SO_4+BaCl_2\rightarrow BaSO_4+2NaCl[/tex]

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\textMolar mass}}[/tex]

Putting values in above equation, we get:

[tex]\text{Moles of}BaCl_2}=\frac{60g}{208g/mol}=0.29mol[/tex]

Moles of [tex]Na_2SO_4[/tex] = 0.5 moles

According to stochiometry, 1 mole of [tex]BaCl_2[/tex] reacts with 1 mole of [tex]Na_2SO_4[/tex]

Thus 0.29 moles of [tex]BaCl_2[/tex] will react with 0.29 moles of [tex]Na_2SO_4[/tex]

Thus [tex]BaCl_2[/tex] is the limiting reagent as it limits the formation of products and [tex]Na_2SO_4[/tex] is the excess reagent.

1 mole of [tex]BaCl_2[/tex] produces = 1 mole of [tex]BaSO_4[/tex]

0.29 moles of [tex]BaCl_2[/tex] will produce= 0.29 moles of [tex]BaSO_4[/tex]

The reactant Zn is an

element
an ionic compound
a molecule
an oxide.

Answers

Zn is an element. It can be found in the periodic table of elements.

This is just an element. Since there is no chemical or charge with the Zn it is just an element

What is a type of mineral

Answers

Hello,

Here is your answer:

The proper answer to this question is a type is "sedimentary ".

Here is how:

For example: Pumice is known as the lighter rock that can be found its a sedimentary rock that is form but deposition on bottom of rivers.

Your answer is sedimentary.

If you need anymore help feel free to ask me!

Hope this helps!

Both algae and amoeba are in the domain Eukarya. Which of the following characteristics do they most likely share?

They both belong to the plant kingdom.

They both have cells with no nucleus.

They both have cells with membrane-bound organelles.

They both belong to the animal kingdom.

Answers

Answer: They both have cells with membrane- bound organelles.

Explanation:

The domain eukarya includes the eukaryotic organisms, which range in diversity from single celled to multicellular. These organisms have cells that have membrane bound organelles, nucleus is present in them. These organisms range from simple to complex life cycles.

Hence, both algae and amoeba which belong to domain eukarya have membrane bound organelles in their cells.

Answer:

C, They both have cells with membrane-bound organelles.

Explanation:

I did the module exam

How hot or cold is Mercury

Answers

in the day it's -279 Fahrenheit ( -173 Celsius) and at night it's 801 Fahrenheit ( 427 Celsius)

Well it all depends on the time of day, where it varies from very cold
(-279F or -173C)at night to very hot (800F or 430C) during the day. This is due to the lack of atmosphere this planet has. And although it is the closest planet to the sun it is only the 2nd hottest planet

the gas left in an used aerosol can is at a pressure of 103 kPa at 25 degrees celsius if this can be thrown into fire what is the pressure of gas when it's temperature reaches 928 degrees Celsius

Answers

Hello!

The pressure of the gas when it's temperature reaches 928 °C is 3823,36 kPa

To solve that we need to apply Gay-Lussac's Law. It states that the pressure of a gas when the volume is left constant (like in the case of a sealed container like an aerosol can) is proportional to temperature. This is the relationship derived from this law that we use to solve this problem:

[tex]P2= \frac{P1}{T1}*T2= \frac{103 kPa}{25}*928=3823,36 kPa[/tex]

Have a nice day!

Answer:

415.11 kPa

Explanation:

The gas law to be applied here is Gay-Lussac's law. Gay-Lussac's law states that the pressure of a given mass of gas is directly proportional to it's temperature (in kelvin) provided volume remains constant.

The formula for the law is

P₁/T₁ = P₂/T₂

where P₁ is initial pressure (103 kPa)

P₂ is final pressure (unknown)

T₁ is initial temperature (25°C + 273 = 298K)

T₂ is final temperature (928°C + 273 = 1201K)

From the formula,

103/298 = P₂/1201

P₂ = [tex]\frac{103 * 1201}{298}[/tex]

P₂ = 415.11 kPa

415.11 kPa is the pressure of the gas when it temperature reaches 928°C.

HELP FAST PLZ!!!!
which statement describes the role of decomposers in the carbon cycle?
A they release the carbon that remains in the bodies of dead organisms.
B they prevent carbon from escaping into the atmosphere
C they absorb carbon dioxide in the atmosphere
D they change carbon dioxide into a form that organisms can use.

Answers

b is the correct answer i hope this helps good luck on test.

Answer:

Your answer would be A.

Explanation:

I took a quiz with the same exact question

Earth's path around the sun is _____.

a) eliptical
b) circular
c)random
d) triangular

Answers

The answer is A

Hope this helps

~ Jordan ~

A (n) blank is a vent or fissure in the earths surface through which magma and gases are expelled

Answers

Volcano is the answer I believe

Answer:

Volcanoes

Explanation:

The volcanoes are the features on the earth's surface through which the magma comes out along with other gases.

The formation of the volcano is associated with the divergent and the convergent type of plate boundary. Due to this motion and subduction of heavier plates, the plates at greater depth melts and mixes up with the uprising magma. This magma then rises up towards the surface in the over-riding plate, forming volcanoes, from where the magma erupts on the surface forming lava along with the emission of various gases such as carbon dioxide, sulfuric acid, and hydrogen sulfate.

Sunlight is energy that comes from the sun. How is that energy produced?

A. Molecules break down, releasing chemical energy.

B. Uranium atoms split apart, releasing nuclear energy.

C. Hydrogen atoms fuse together into Helium, releasing nuclear energy

D. Molecules are created, releasing chemical energy

I'm pretty sure its C but I want to get a second opinion.

Answers

The answer is C. Correct

Answer:

the answer is C

Explanation:

this is the reaction that happens inside the sun: every four Hydrogen Ions fuse together forming on Helium Ione and the difference in mass between the four Hydrogen Ions and the one Helium Ione is converted into nuclear energy.

Other Questions

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