Answer:
We need the picture to answer the question
Explanation:
but i did do this test and number 4 was biotic and number 5 was abotic hope this helped
.Each of the three resonance structures of NO3– has how many lone pairs of electrons?
Answer:
➢ There are eight lone pairs of electrons in each of the three resonance structures of NO3- ion. These eight lone pairs are provides by three oxygen atoms. There are no lone pairs on nitrogen atom.
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Calculate the heat energy required to melt 4kg of ice when the specific latent heat of fusion of water is 334,000 J/kg.
1336 kJ
2336 kJ
3336 kJ
HELP ASAP
[tex]\bold{\huge{\blue{\underline{ Solution}}}}[/tex]
We have given in the question that,
4kg of ice melts at the specific latent heat of fusion of water is 334,000 J/kg .We know that,
Amount of heat required = Mass * specific heat * change in temperature
[ Specific Latent heat of fusion is the amount of heat required to change one mole of substance from solid to liquid phase without changing in temperature .]
But, For complete melting of substance without change in temperature
Amount of heat required = Mass * Specific latent heat of fusion
Subsitute the required values,
[tex]\sf{\red{ Q = MCl}}[/tex]
Where,
Q = Amount of heat required M = Mass of the substance Cl = Specific latent heatNow,
[tex]\sf{ Q = 4 × 334000}[/tex]
[tex]\sf{ Q = 1336000 J }[/tex]
[tex]\sf{ Q = 1336 KJ }[/tex]
Hence, The amount of heat required to melt 4kg ice is 1336KJ
[tex]\bold{\red{ Option\: A \:is\: correct }}[/tex]
Taking into account the definition of calorimetry and latent heat, the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 [tex]\frac{J}{kg}[/tex] is 1,336 kJ.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Latent heatLatent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
Heat energy required to melt iceIn this case, you know:
m= 4 kgL= specific latent heat of fusion of water= 334,000 [tex]\frac{J}{kg}[/tex]Replacing in the expression for latent heat:
Q = 4 kg× 334,000 [tex]\frac{J}{kg}[/tex]
Solving:
Q= 1,336,000 J= 1,336 kJ (being 1,000 J= 1 kJ)
Finally, the correct answer is the first option: the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 [tex]\frac{J}{kg}[/tex] is 1,336 kJ.
Learn more about calorimetry:
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A chemist reacts sodium metal (Na) and chlorine gas (Cl) to form salt according to the balanced chemical equation: Na Cl → NaCl. If the chemist has 35. 0 g Na, what mass of chlorine must he or she use to react completely with the sodium? Finally, solve (remember significant figures):.
If the chemist has 35.0 g of Na, then 26.94 grams of chlorine is required to react completely with the sodium.
How we calculate number of moles?Number of moles of any substance can be calculated as [tex]${\rm{n = }}\frac{{\rm{W}}}{{\rm{M}}}$[/tex].
Where, W = given mass
M = molar mass
Balanced equation for the formation of NaCl can be written as:
[tex]${\rm{2N}}{{\rm{a}}_{{\rm{(s)}}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}_{{\rm{(g)}}} \to {\rm{2NaC}}{{\rm{l}}_{{\rm{(s)}}}}$[/tex]
Here the ration of Na and Cl is 2:1.
No. of moles of Na = 35/23 = 1.52 mole
If 2 moles of Na is consumed by 1 mole of Cl, then 1 mole of Na is consumed by half mole of Cl.
Mole of Cl required to consume 1 mole of Na = 1.52/2 = 0.760 mole.
Now used mass of Cl can be find out by using the formula of moles as follow:
W = 35.45 × 0.760 = 26.94 grams
Hence, 26.94 grams of Cl is required to completely react with 35.0 grams of Na.
To learn more about moles, visit the below link:
https://brainly.com/question/15356425
Answer:
54
Explanation:
trust me its what it told me the expert verified confusing
At 19 °C, the vapor pressure of pure ethanol is 40.0 mmHg.
What is the pressure in atm?
atm
Answer:
0.05263158 atm
Explanation: mmHg to Atmosphere Conversion Example. Task: Convert 975 mmHg to atmospheres (show work) Formula: mmHg ÷ 760 = atm Calculations: 975 mmHg ÷ 760 = 1.28289474 atm Result: 975 mmHg is equal to 1.28289474 atm. This is an example for how i got the answer.
What are the two different ions present in the compound NH4NO3?
Answer:
I believe its an NH4^+ ion & an NO3^- ion
Explanation:
hope this helps!
SOMEONE HELP ME PLEASE
Convert the answer above to Kelvin
Answer:
293°C
Explanation:
20°C+273=293°C
A canoeist is paddling his boat, which is equipped with the necessary safety environment. Identify at least three synthetic fibres or plastics used in this case.
pls help me
Answer:
Nylon, Cabon Fibre, High-Density Polythene.
If You Like My Answer Mark It As Brainliest.
The three synthetic fibers or plastics used by the canoeist are:
Carbon FibreHigh-Density Polythene.NylonWhat are synthetic fibers?Synthetic fibers are defined as man-made textile fibers that are generated from chemical substances. Some of these man-made fibers are also derived from natural substances such as cellulose or protein.
Based on the given question, the three synthetic fibers or plastics used by the canoeist are:
Carbon FibreHigh-Density Polythene.NylonLearn more on synthetic fibers here; https://brainly.com/question/25834689
How many moles of O2 are required to react with 2.4 mol of H2 ?
Please explain your answer, I’m really trying to understand the concept!!!
Answer:
1.2 moles
Explanation:
this is the balanced equation for the reaction of oxygen (O2) and hydrogen (H2), usually we don't write the 1 in front of O2
2H₂ + 10₂ → 2H₂O
the molar ratio of hydrogen to oxygen is 2 : 1
we are trying to react with 2.4 mol of H2 so the moles of O2 is half the number of moles of H2 = 2.4 ÷ 2 = 1.2 mol
another way to think of it:
2H₂ + 10₂
2 : 1
2.4 mol : x mol
to get from 2 to 2.4 multiply by 1.2, so do the same to the other side
1 × 1.2 = 1.2 mol
Given the following balanced equation:
4NH3 + 6NO --> 5N2 + 6H2O
The molar ratio of:
Ammonia to nitrogen?
Ammonia to water?
Nitric Oxide to ammonia?
Nitric Oxide to water?
Water to ammonia?
Some _____ gels have fiberglass strands compounded into them during the manufacturing process. Milady
Mass and energy are cycled around us all the time. What do you think your role is in the cycling of energy? Where do you get energy from and where does the energy go?
Answer: Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix. These sources originate mostly in our local star, the Sun. Electricity falls into its own category because it's an energy carrier and not a primary source.
Explanation:
Answer:
Our primary energy source is fossil fuels, with nuclear power and renewable energy sources rounding out the mix. These sources are mostly derived from our nearest star, the Sun. Electricity is classified separately because it is an energy carrier rather than a primary source.
Explanation:
I had that question before it was hard good luck :D
Is foam a conductor or an insulator? Explain.
Answer:
Polystyrene and plastic foam are both used as insulators as they have small air bubbles trapped inside them. This makes them very good insulators because heat energy can't flow through them
Explanation:
If you have 1.00 grams of NaHCO3 , how much IM HCI will you need to react all of the NaHCO3? Give your answer in mls.
Answer:
Here is your answer
Explanation:
Please mark me brainliest
There can be many different colors of beetles within the same species.This is an example of
Answer:
natural selection
Explanation:
The process that results in changes to the genetic material of a population over time
How is an electromagnet similar to and different from a regular magnet?
Answer:
that the electromagnet can have a magnetic field when an electric current flows through it and disappears when the flow of the current stops, while permanent magnets are made up of magnetic material that can be easily magnetized and can create
Explanation:
Which statement is correct? 22 points
Nearly all mutations are good.
Nearly all mutations are harmful.
Most mutations produce no effect.
List two ways you will take care of seniors, babies, family members with special needs, or pets during
an emergency
Answer:
prepare
Assemble a disaster supply kit.
Locate safe places in your home for each type of disaster.
Determine the best evacuation routes from your home.
Become trained in first aid and CPR.
Show each family member how and where to shut off utilities (water, gas, electricity).
Explanation:
What is an aquifer?
Question 2 options:
a type of surface water
pore space in the rock and soil layer beneath our feet
precipitation that soaks through the surface soil
natural underground storage area
Liquids with high equilibrium vapor pressure have low _______?
Iron is produced from its ore, iron oxide, by using a displacement reaction.
This is done in a blast furnace.
Which element is used to displace iron?
Answer:
its carbon
Explanation:
iron oxide + carbon = iron + carbon dioxide
as coke(mainly carbon) is a raw material gone into a blast furnace displaces iron.
would you rather be hot or cold
Answer:
cold
Explanation:
because being cold helps to refresh my body personally
Answer:
hot
Explanation:
because I like to stay warm and take warm showers
What do you already know about fossils? Describe as much as you can in the space below.
Answer:
Fossils are remains or traces from ancient life's that is most likely buried in rocks anywhere in the world. Fossils are basically bones, teeth, shells, nests, leaf impressions, and footprints. That is technically explaining what our planet was like long ago. Some dinosaur fossils have been found. Paleontologists find them almost everywhere. If you don't know what Paleontologists are, they're basically people who study fossils. A lot of fossils are found in sedimentary rocks. Sedimentary is a rock that has been formed from things like sand, mud, and many other kinds of rocks.
Hope this helps.
42. In order to turn on the light, a piece of wire
needs to be connected from
43. Which of the following energy conversions is
best illustrated by the diagram above?
The molar mass of AI2CI6 is the mass of one mole of the compound. It is also which of the following?
A. The mass of 1 mole of AI and 1 mole of CI
B. The mass of 2 moles of AI and 6 moles CI
C. The mass of ½ mole of AI and ½ mole of CI
D. The mass of ¼ mole of AI and ¾ mole of CI
Answer:
Is their a picture with the question?
Explanation:
i need help yall ill mark brainliest :)
Answer:
How does non-human life in an urban ecosystem differ from that in an undeveloped forest ecosystem?
Explanation:
In forest eco system the people are uncivilized and not so much educated. And in urban eco system people are intelligent as well as educated this is the main reason. In an urban ecosystem, the only non-human life that live there are the ones that are able to survive under the conditions. However, in undeveloped forest ecosystems, there’s barely any pollution. Therefore, a bigger variety of non-human life is able to live here.
Mark brainliest if you can please :)
HELP PLEASE!! ASAP What would the mass be in kg?
Answer:
i guess answer is 0.0600
Explanation:
Here,
Density=0.791g/cm^3
Volume=75.89ml
So,
Mass=Density*Volume
=0.791g/cm^3×75.89ml
=60.02g/cm^3.ml
Expressing them in kg
60.02/1000
=0.0600 kg
Describe in your own words a situation where chemical energy is transformed to potential energy.
ANSWER NOW 80 POINTS
Answer:
An important example of chemical potential energy is the energy stored in the food that you eat. Inside your body, this food is distributed around your body and is reacted in your cells to release the energy stored in the chemical bonds.
Explanation:
Directions : Answer the following problems and show the solution
1.Calculate the speed for car that went a distance of 125 kilometers in 2-hour time
Equation (Formula) :
Plug numbers into the Equation (Substitute) :
Solution:
Final answer with unit of measure :
2.A baseball is thrown a distance of 60 meters . What is its speed if ot takes 0.5 seconds to cover the distance ?
Equation (Formula):
Plug numbers into the Equation (Substitute):
Solution:
Fina Answer with unit measure:
Correct Answer Brainliest
Wrong Answer Report
Answer:
Alb sick see dress fbcd soft comfy also could for church food collection conservatismSupplies the chemical energy for cell growth
Anabolic
Catabolic
Anabolism requires energy to grow and build.
To balance this equation, how many NaBr are need
NaBr + Ca(OH)2 Cabr2 + NaOH