Answer:
253.02 kJ.
Explanation:
The balanced reaction for the decomposition of baking soda is
2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)
We can find the heat of reaction by using the Hess' Law. This is done by using this formula:
∑(Hf,products) -∑(Hf,reactants) = Heat of reaction
where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:
NaHCO3: -947.68 kJ/mol
Na2CO3: -1130.94 kJ/mol
CO2: -393.51 kJ/mol
H2O: -241.8 kJ/mol
Applying Hess' Law:
[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ
Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ.
What is an alternative fuel?
O A. One that is available as a backup
B. One that uses nonrenewable resources
C. One that has not been developed yet
D. One that is not a fossil fuel
SUB
James developed a plan to find the percent composition of the compound KClO3. His first step was to find the mass of the individual elements. He found the individual element molar masses by using A) a balance B) a calculator C) a periodic table D) a graduated cylinder
Answer:
C) periodic table
Explanation:
Answer:
c
Explanation:
cmon its so obvious
Exercise while in space is important because it PREVENTS what?
Starvation
Muscle deterioration and bone loss
Boredom
Sleep loss
Answer:
bone loss and muscle deterioration
Explanation:
this helps the body keep thriving and bones strong and muscles in tact
From Earth to space, what is the correct order of the main layers in the atmosphere?
Answer:
troposphere, the stratosphere, the mesosphere and the thermosphere
Explanation:
The atmosphere of the earth is composed of layers based on the temperature. There are four layers in the atmosphere. They are ordered as troposphere, stratosphere, mesosphere and the thermosphere.
What are layers of atmosphere?The atmosphere of the earth is layered and each layer of the atmosphere has its own characteristics. The weather processes occur in the lower layers of the atmosphere. The four important layers are troposphere, stratosphere, mesosphere and the thermosphere.
The lowest layer of the atmosphere where we live is called the troposphere. It is this layer which contains weather, clouds, rain and snow. The layer above troposphere is called the stratosphere. It is in this part where ozone is found.
The mesosphere is found above stratosphere. Here the temperature is found to be less and reaches a minimum of about -90°C. The thermosphere lies above the mesopause where the temperature will be very high.
Thus the correct order is troposphere, stratosphere, mesosphere and the thermosphere.
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How can liquid reach higher temperatures in a pressure cooker than in an unsealed pot?
Answer:
Simple, the heat of it causes the atoms to move more quickly, which produces and uses energy.
Explanation:
Answer:
By heating in a closed system.
Liquids can reach higher temperatures in a pressure cooker than in an unsealed pot by the application of heat to the pressure cooker.
A pressure cooker is usually tightly closed with no surrounding air interference which helps to maintain the temperature and increase in the elastic collision of particles. The increase in particle collision helps the liquid in the pot to attain a higher temperature.
However, heating in an unsealed pot makes the interference of surrounding air with it very possible which will definitely slow down the particle collisions and reduce the temperature and pressure due to the both of them being directly proportional to each other.
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How can we keep our voices in tip top shape? Please list the three things we can do to help our voices. Which would you say is most important?
Explanation:
Hydrate, diet, and vocal hygiene. I think hydrating is the most important.
Answer:
1) Exercise it by singing and hitting different notes, however don't go overboard
2) Make sure you don't overuse your voice, as well as trying to rest your voice when you are sick
3) Overall, have healthy habits, like not smoking and drinking a sufficient amount of water. Explanation: good job this year. i know it was hard doing everything online
What’s a giant hunk of rock and metal
Answer: “We live on a hunk of rock and metal that circles a humdrum star that is one of 400 billion other stars that make up the Milky Way Galaxy which is one of billions of other galaxies which make up a universe which may be one of a very large number, perhaps an infinite number, of other universes. That is a perspective on human life and our culture that is well worth pondering.”
― Carl Saga
Is this it mate?
I NEED HELP DESPERATELY!!!!!!!!!!!!!!!!!! If 20 waves pass a fixed point in 5 seconds, the frequency of the wave is....What???
Answer:
Frequency, f = 4 Hz
Explanation:
We have,
Number of waves passing a fixed point are 20
Time, t = 5 seconds
It is required to find the frequency of the wave. Frequency of a wave is defined as the number of waves passing through a point per second. Its mathematical form is given by :
[tex]f=\dfrac{n}{t}\\\\f=\dfrac{20}{5}\\\\f=4\ Hz[/tex]
So, the frequency of the wave is 4 Hz.
Which statement explains how commercial land use negatively impacts watersheds?
O Chemicals in fertilizers run off into water and cause algae blooms.
O Production of clothing items makes pollutants that contaminate the water.
O Chemicals from lawn maintenance leach into water and are washed into rivers.
O Motors from boats and wave runners leak fuel pollutants into water and affect fish.
Answer:
Chemicals in fertilizers run off into water and cause algae blooms
Explanation:
Of the answer choices, the ones that have to do with commercial land use are the ones discussing fertilizers. Some commercial land is dedicated to lawn, but commercial farms are a much larger portion of commercial land use. The appropriate choice is, "Chemicals in fertilizers run off into water and cause algae blooms."
100% short length
100% medium length
100% long length
50% long , 50% short
Answer:
100% medium
Explanation:
Since you got all Hh which equals medium it means all are going to be that.
Answer:
100% med
Explanation:
Scientists classify the parts of a phospholipid molecule according to their chemical properties. What are these parts? an acidic head and basic tails hydrophilic tails and a hydrophobic head a hydrophilic head and hydrophobic tails acidic tails and a basic head
Answer: hydrophilic head and hydrophobic tails
Explanation:
A phospholipid consists of glycerol molecule, 2 fatty acids, and 1 phosphate group that is replaced by alcohol. In the phosphate group the polar head is negatively charged and hydrophilic in nature, whereas the fatty acid chain is nonpolar tails, that are hydrophobic. The tails are hydrophobic which face the inside and away from water.
Answer:
hydrophilic head and hydrophobic tails
In terms of disorder and energy, systems in nature have a tendency to undergo changes toward
less disorder and lower
energy
less disorder and higher energy
greater disorder and lower energy
greater disorder and higher energy
Answer:
Option C is correct
Explanation:
Entropy is defined as the randomness in a system. In nature, a system tends to have high entropy. The higher the entropy , the spontaneous the reactions would be. As a system loses energy, it becomes more ordered and less random. Hence, as the reaction proceeds in a system, the system has higher energy/entropy and less order.
Hence, option c is correct
which statement about valence electrons is true?
A) they are located in the outer energy level of an atom
B) they are potentially involved in chemical reactions
C) they determine whether an element can conduct electricity
D) all of the above
Answer:The number of electrons in an atom's outermost valence shell governs its bonding behavior. Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements
Explanation: B
it's D because the are located in the outer most shell, they are responsible for the chemical reaction and determine if they conduct electricity or not, you can look it up if you don't believe me
Which of the following is true for a reliable scientific source?
It cites logic
It cites opinions.
It cites valid data.
It cites common sense.
Answer:
It cites valid data
Explanation:
It clearly shouldn't cite opinions cause then that isn't science. Every thing else seems like an okay answer but it cites valid data is the best answer since the data should be valid no matter what.
Which of the molecules in the figure has the most carbon atoms?
Which of the molecules in the figure has the most carbon atoms?
Ethylene glycol
Oxygen
Water
Carbon dioxide
Aspirin
Ethanol
Previous Answers
Correct
Part B
How many are there in that molecule?
Express your answer as a signed integer.
Number of carbon atoms =
Answer:
Aspirin, 9 carbon atoms
Explanation:
(would really appreciate the brainliest)
Aspirin is a compound which has most carbon atoms that is it has 9 carbon atoms.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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How Do Glow Sticks Glow? Explain in 5-6 sentences. IF NOT, YOUR ANSWER WILL BE DELETED
Answer:
All liquid glow products depend on a chemical process known as CHEMILUMINESCENCE to produce their light. Chemiluminesence is a chemical reaction that causes a release of energy in the form of light. To produce this light the electrons in the chemicals become excited and rise to a higher energy level.To utilise this process glowsticks contain two liquids; hydrogen peroxide and tert-butyl alcohol. When mixed together it is these liquids that create the glow. Fluorescent dyes are also used in the alcohol to alter the colour of the light emitted. Chemiluminesence is a chemical reaction that causes a release of energy in the form of light.
Explanation:
Hope It Helps!
Marcy is running in a race. Her body is changing into .
Answer:
Running changes your body by burning body fat and building muscles. Expect to lose fat at the top of your thighs, build stomach muscles of steal and a butt to die for the weight. ... Running increasing your strength and endurance plus interval training can boost your metabolism.
Explanation:
can magnetism create an electric flow
(a simple yes or no)
Answer:
yes
Explanation:
What might happen if you got too close to the center of the Milky Way galaxy?
AYou would be burned up by the galaxy's brightest stars. incorrect answer
BYou would be spun outwards toward the edge of the galaxy. incorrect answer
CYou would be trapped in the gravitational pull of a black hole. incorrect answer
DYou would find yourself traveling faster than the speed of light.
Answer:
you would be trapped in the gravitational pull of a black hole
Explanation:
there is a black hole in the center of the galacy
10. How many atoms are in 2 moles of H2O?
Answer:
1.204 * 10^24
Explanation:
the strong nuclear force is always smaller then the electrostatic force true or false
Answer: I think that the answer was False.
Answer: false
Explanation:
Gravitational, electrostatic, strong nuclear, and weak nuclear
Acid and base ph PhET simulation lab
Answer:
Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize ... Investigate whether changing the volume or diluting with water affects the pH. ... Original Sim and Translations ... Lab, Chemistry.
Please help me I have to turn it in today
explain also
Answer:
cylinder A has a higher density then cylinder B or more accurately the liquid in cylinder A is denser then the liquid in the second tube.
Explanation:
"Denser" simply means more matter is contained in the same space for example say you fill a tank with helium and another tank with water. Although they are the same size one will weigh much more because their is more particles or "stuff" inside the same area this can be because of a few things one it can be because the atoms or elements that compose the substance are heavier containing more electrons and protons in their orbit. or the molecular structure is more compact like a chicken wire fence has more wire in it then a barbed wire wire fence covering the same area because of the grid of wire in the middle.
Answer:
A is denser.
Explanation:
A racehorse completes the Kentucky Derby, a distance of 1.25 miles, in
exactly 2.00 minutes. How fast is the horse in kilometers per hour?
A. 0.00647 kilometers per hour
B. 23.3 kilometers per hour
C. 0.0168 kilometers per hour
D. 60.3 kilometers per hour
Answer:
D. 60.3 kilometers per hour
Explanation:
Hello,
In this case, we first compute the miles in kilometres:
[tex]1.25miles*\frac{1.60934km}{1mile} =2.012km[/tex]
Then the minutes in hours:
[tex]2.00min*\frac{1h}{60min}=0.033h[/tex]
Finally, the velocity:
[tex]v=\frac{2.012km}{0.033h}\\ \\v=60.3km/h[/tex]
Thus, answer is D. 60.3 kilometers per hour
Best regards.
The compound butanol has the following structural formula.
Which of these is a structural isomer of butanol?
Answer:
Option B
Explanation:
A structural isomer of an organic compound refers to a compound that has the same molecular formula, but a different arrangement of atoms in the carbon chain.
Butanol has the molecular formula C4H9OH. We can now explore the options to see if any of them have the same molecular formula.
Option A has no oxygen in it, so we can rule it out
Option B has 4 carbon atoms, 9 hydrogen atoms and 1 oxygen atom as well as single Chain branches. This makes it the structural isomer of Butanol ( C4H9OH).
Option C has only 3 carbon atoms which rules it out as being an isomer.
Answer:
option b on edge
Explanation:
Select all of the items that are true about a sample of water vapor at 101°C as it cools.
Its temperature will fall continuously until it condensed into a liquid.
Its temperature will fall steadily until reaching 100°C.
The molecules of water gain potential energy.
Its temperature will remain at 100°C until all the vapor condenses.
Answer:
D. Its temperature will remain 100 C until all the vapours condenses
Explanation:
Heat absorbed by a substance to change the state of matter is known as latent heat. This heat is utilized to break the bonds between atoms of the substance so that they can undergo phase change.
So, when water boils at 100 degree Celsius then temperature will remain constant unless and until all the water changes into vapor. As it is the latent heat that breaks the bonds between hydrogen and oxygen atoms of water so that liquid state can change into gaseous state.
Since latent heat is a hidden heat, that is why, it does not get reflected and there is no change in temperature due to it.
Thus, we can conclude that it is true that temperature will remain at 100°C until all the vapor condenses for a sample of water vapor at 101°C as it cools.
carbon black in making printing ink is by oxidation of ?
Answer:
Explanation:
It is also known to be a non-conductive material due to its volatile content. The coatings and inks industries prefer grades of carbon black that are acid-oxidized. Acid is sprayed in high-temperature dryers during the manufacturing process to change the inherent surface chemistry of the black.
electric service has accumulated on an object is referred to as
Answer:
Static Electricity! :)
Explanation:
What do ionic bond and covelant bond have in common?
A) Both types of bond involve only one electron
B) both type of bonds involve valance electrons
C) electrons are transferred from one atom to another in both types of bonds
D) Electrons are shared between atoms in both types of bonds
Answer:
C) electrons are transferred from one atom to another in both types of bonds
Explanation:
Which element is most likely to have the ability to be hammered into a thin sheet?(Nitrogen, Silicon, Fluorine, Calcium)
Answer:
Calcium
Explanation:
The ability to be hammered into sheets is known in chemistry as malleability. One of the properties of metals is that metals are malleable. All metals thus have a common property that they can be hammered into sheets used in diverse applications. We can see diverse thin sheets of metals around us used to diverse purposes. This is a vary important property of metals that amplify its importance in materials science.
Of all the options listed, only calcium is a metal. Since nonmetals and metalloids can not be hammered into sheets, nitrogen, silicon and fluorine can not be hammered into sheets. Calcium, being a metal can be hammered into thin sheets.
Question:
Options
1) Nitrogen
2) Silicon
3) Fluorine
4) Calcium
Answer:
The correct option is;
4) Calcium
Explanation:
We analyze each of the elements as follows;
Nitrogen is a gas at room temperature, therefore it cannot be hammered into sheets
Silicon is a brittle non-metal, that breaks when struck
Fluorine is a gas at room temperature, therefore it cannot be hammered into sheets
Calcium is a soft, solid silvery-white, metallic element that is ductile, hence, it can be beaten into very thin sheets.