Answers
Exothermic reactions only release thermal energy, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
What is an exothermic reaction ?An exothermic process is one in which energy is given off as heat or light. In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.
The most exothermic reaction is the burning of methane because it generates a significant quantity of heat.
Thus, Exothermic reactions only release thermal energy.
To learn more about an exothermic reaction, follow the link;
https://brainly.com/question/10373907
#SPJ9
Related Questions
Please i meed help quick and thank you
Answers
It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.
How did we identify the dependent event?The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.
If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same
Find more exercises on dependent events;
https://brainly.com/question/11473170
#SPJ1
In a nuclear fission reaction, a freely moving neutron is introduced to a
nuclear fuel, such as uranium-235. What happens next?
O A. A neutron is absorbed by an atom's nucleus.
B. The neutron breaks apart.
O C. Heat is released by the neutron.
D. The nucleus becomes unstable.
Answers
The nucleus becomes unstable when a freely moving neutron is introduced to a nuclear fuel.
What is Nuclear fission?This is a reaction in which the nucleus of an atom splits into two or more smaller nuclei.
This reaction produces more neutrons and the nucleus becomes unstable when a freely moving neutron is introduced to a nuclear fuel to form fission fragments.
Read more about Nuclear fission here https://brainly.com/question/3992688
#SP2
What does the term "thermometer" mean?
Answers
Answer:A thermometer is a tool that measures temperature — how hot or cold something is. Thermometers are used to see if you have a fever or tell you how cold it is outside.
Explanation:
Answer: A Device That Measures Temperature.
Explanation:
. Sulphuric acid (H2SO4) is extremely corrosive to skin. *
O Analytical Chemistry
Physical Chemistry
Biochemistry
O Inorganic Chemistry
Answers
The fact that sulphuric acid is extremely corrosive to skin is a part of physical chemistry (option B).
What is physical chemistry?Physical chemistry is the science that uses theories and techniques from physics to study chemical systems.
Physical chemistry blends the principles of physics and chemistry to study the physical characteristics, or properties, of molecules.
According to this question, the corrosive feature of sulphuric acid is a physical attribute of the substance, hence, it is studied under physical chemistry.
Learn more about physical chemistry: https://brainly.com/question/27958732
#SPJ1
What is the zonecreated if force of separation occurs?
Answers
Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?
(1 point)
argon (Ar)
O germanium (Ge)
O vanadium (V)
polonium (Po)
Answers
Answer:
Vanadium (V) is the best conductor of thermal energy in this list
According to the following reaction, how many moles of hydrobromic acid are necessary to form 0.274 moles bromine?
hydrobromic acid (aq) —>hydrogen (g) + bromine (1)
moles hydrobromic acid
Answers
Answer:
0.548 moles of HBr are required
Explanation:
Given data:
Number of moles of hydrobromic acid = ?
Moles of bromine formed = 0.274 mol
Solution:
Chemical equation:
2HBr → H₂ + Br₂
Now we will compare the moles of HBr with Br₂.
Br₂ : HBr
1 : 2
0.274 : 2×0.274=0.548
Thus, 0.548 moles of HBr are required.
What is the volume of 3.00 M sulfuric aid that contain 9.809 g of H2SO4 (98.09g/mol)
Answers
Answer:
\(V=0.0333L=33.3 mL\)
Explanation:
Hello there!
In this case, according to the given information, it is necessary for us remember that the molarity is calculated by dividing the moles by the volume of the solution in liters so the volume is calculated by dividing moles by the given molarity. However, we first need to calculate the mole given the mass and molar mass of the solute, H2SO4:
\(n=\frac{9.809g}{98.09g/mol}=0.1mol\)
Thus, the volume turns out:
\(V=\frac{0.1mol}{3.00mol/L}\\\\V=0.0333L=33.3 mL\)
Regards!
Sally has constructed a concentration cell to measure Ksp for MCln. She constructs the cell by adding 2 mL of 0.05 M M(NO3)n to one compartment of the microwell plate. She then makes a solution of MCln by adding KCl to M(NO3)n. She adds 8.138 mL of the resulting mixture to a second compartment of the microwell plate. Sally knows n (the charge on the metal ion) = +2
She has already calculated [Mn+] in the prepared MCln solution using the Nernst equation. [Mn+] = 8.279 M
Required:
How many moles of [Cl-] must be dissolved in that compartment?
Answers
Answer:
0.13475 mol
Explanation:
From this question sally knows that n= 2
MCln = MCl
[Mn+] using nernst equation = 8.279
The volume of the resulting mixture Mn+ = 8.138 ml
The number of moles mn+ =
8.279 x 8.138
= 67.375mmol
= 0.067375
Since n = 2
The mold of cl- that must be dissolved in the compartment
= 0.067375 x 2
= 0.13475 mols
Is anyone good at chemistry if so can someone help me please ?
(NO LINKS)
Question 15
Answers
We're given the [OH⁻] as 8.34 × 10⁻¹² M. Using the formula pOH = -log[OH⁻], the pOH of this solution would be -log(8.34 × 10⁻¹²) ≈ 11.08.
The pOH is, for lack of a better term, the "opposite" of pH: A pOH of 7 is neutral; a pOH less than 7 is basic; and a pOH greater than 7 is acidic.
This follows from the relation, pH + pOH = 14. In this case, with a pOH of 11.08, our pH would be 14 - 11.08 = 2.92, which is acidic (pH < 7).
Thus, the correct answer choice is B.
rinking water suggest an upper limit of 250 mg/L for chloride ion. If 1.03×104 liters of water in a storage tank contains 1.40 grams of Cl-, what is the contaminant level in ppm? in ppb? Is this level acceptable based on EPA guidelines?
Answers
Answer:
This water has a level acceptable, 0.1359ppm and 135.9ppb.
Explanation:
1.40g of Cl⁻ are:
1.40g Cl⁻ × (1000mg / 1g) = 1400mg Cl⁻
In 1.03x10⁴L:
1400mg / 1.03x10⁴L = 0.1359mg/L.
As the upper limit of Cl⁻ in water is 250mg/L, this water has a level acceptable
ppm are the ratio between mg of solute and liters of solution, that means the tank contains 0.1359mg/L = 0.1359ppm
ppb, parts per billion are 1000 times ppm, thus, parts per billion of the storage tank are:
0.1359ppm × 1000 = 135.9ppb
This time, include both the coefficient and exponent. Express 0.00212 in scientific notation.
[?] * times 10^[?]
Enter the coefficient in the green box and the exponent in the yellow box.
Coefficient (green) Exponent (yellow)
_______________ _____________ Enter
![This time, include both the coefficient and exponent. Express 0.00212 in scientific notation.[?] * times](https://i5t5.c14.e2-1.dev/h-images-qa/contents/attachments/lnMi2a3nGuhR8UXZWuiEWNQeM7a27uTR.jpeg)
Answers
Answer: 212
Explanation:
A 200 g sample including calcium (Ca), reacts with the excess of hydrochloric acid
(HCl). If 4 g of hydrogen gas (H2) is produced, calculate the Ca% of sample?
Ca + HCl → CaCl2 + H2 (Ca: 40 g/mol and H: 1 g/mol)
Answers
A 200 g sample including calcium (Ca), reacts with the excess of hydrochloric acid. If 4 g of hydrogen gas (H2) is produced, 36.3% is mass percent of calcium of sample.
The term mass percent is sometimes referred to as weight percent or w/w%. The total mass of every one of the atoms in a mole that makes up the compound is the molar mass. The total of all the individual percentages ought to equal 100 percent.
Check the last important number for rounding errors to ensure that the percentage add up. The relative amounts of the components in a compound of chemicals are described by their mass percent composition. Mass composition in percent is also referred to as mass percent. The symbol for it is w/w%.
Ca + HCl → CaCl\(_2\)+ H\(_2\)
moles of calcium = 200/ 40= 5 moles
moles of CaCl\(_2\) = 5moles
mass of CaCl\(_2\) = 5× 110.98= 550g
mass % of Ca = (200/550g )× 100=36.3%
To know more about mass percent, here:
https://brainly.com/question/5394922
#SPJ1
Which of these properties is the best one to use for indentification of an element
Answers
Answer:
you need to state the options
need help :( number 5 and 6
Answers
The genesis of a poem for me is usually a cluster of words. The only good metaphor I can think of is a scientific one: dipping a thread into a supersaturated solution to induce crystal formation. I don't think I solve problems in my poetry; I think I uncover the problems.
Number 6.
Unsaturated solutions: found in the vast majority of solutions. eg. blood, soda, alcoholic drinks, cell sap, battery acid.
Supersaturated solutions: invert sugar (a mixture of glucose and fructose), gasses dissolved in crude oil when it is still untapped, some clouds (those that cause cloudbursts).
saturated solution: the carbon dioxide dissolved in sodas (unopened), nitrogen in the air in the earth.
Some spontaneous reactions require a spark in order to begin. A match can provide this what does this spark provide?
Answers
The energy that is provided by the spark of the match is called the activation energy.
What is the activation energy?
The term activation energy is the energy that is required for a reaction to start up. We know that a spontaneous reaction refers to the type of reaction that is able to proceed on its own once it has started. It does not require a continuous supply of energy to proceed.
In this case, the energy that is required to start off the reaction is the activation energy ad that is what is provided by the match that sparks.
Learn more about activation energy:https://brainly.com/question/28384644
#SPJ1
I have a question about my teachers notes. Where does 28g come from?
Answers
Answer
The 28g from the first equation of N2 is the mass of N2 per 1 mole.
If you look at the periodic table, you will see that Nitrogen has a molar mass of 14 u, since it is 2 nitrogen atoms, you say 14 x 2 = 28 g/mol.
Your teacher wanted to convert the mass of N2 to moles, that is why the mass is divided by 28 g (which is per 1 mole).
At constant current is passed through an electrolytic cell containing molten MgCl2 for 18 hr. if 4.8 x 105 g of Cl2
are obtained. Calculate the current in Amperes.
Answers
The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.
To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.
Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:
Q = nF
Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.
In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.
First, we need to calculate the number of moles of Cl2 produced:
Molar mass of Cl2 = 35.45 g/mol
Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol
Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:
Q = nF
Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)
Q ≈ 1.308 x 10^9 C
The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.
Given that the time is 18 hours, we convert it to seconds:
Time = 18 hours * 60 minutes/hour * 60 seconds/minute
Time = 6.48 x 10^4 seconds
Finally, we can calculate the current:
Current (I) = Q / Time
I = (1.308 x 10^9 C) / (6.48 x 10^4 s)
I ≈ 2.02 x 10^4 Amperes
Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.
for more such question on electrolytic visit
https://brainly.com/question/17089766
#SPJ8
I need to find the chemical equation
Answers
Answer:
2NaCN + CaCO3 --> Na2CO3 + Ca(CN)2
Explanation:
Knowing the names gets us: NaCN + CaCO3 --> Na2CO3 + Ca(CN)2
Balance: there are two sodiums and cyanides on the product side so add a 2 to the reactant side.
what mass of glucose c6h12o6 would be required to prepare 5000 mL of a 0.215 M solution
Answers
Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.
To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:
Molarity (M) = moles of solute / volume of solution (in liters)
First, let's convert the volume of the solution from milliliters (mL) to liters (L):
5000 mL = 5000/1000 = 5 L
Now, we can rearrange the formula to solve for moles of solute:
moles of solute = Molarity (M) x volume of solution (L)
moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol
Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:
mass of solute = moles of solute x molar mass of solute
mass of glucose = 1.075 mol x 180.16 g/mol
mass of glucose = 194.0 g (rounded to three significant figures)
Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.
For more such questions on glucose visit:
https://brainly.com/question/397060
#SPJ8
In one of your classes, you were asked to start a program that would help the government in environmental conservation,
which would not fit that program?
A) Encourage your parents to buy Energy Star products.
B) Start a group project to campaign for the protection of an endangered species.
C) Promote the use of phone cases made from crocodile skin.
D) Make flyers about how to recycle trash from homes.
Answers
Because using crocodile skin won’t benefit the environment
if there are more products than reactants, does that mean there is an increase in the forward or backward reaction? And if there are more reactants that products, is there an increase in the forward or backward reaction?
Answers
Answer:
If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.
You estimate that you sent 135 texts last week but when you get the bill, it was actually 175. Calculate the percent error
Answers
Answer: -40
Explanation: Percent error is calculated by subtracting the value you actually recieved from the literature value (175 in your case) SO your answer should be 135-175=-40.
1 point
To help you with estimating, the individual answers to A, B, C should all
have zero in the one's place. Add those answers up to get the numerical
code. Input that code to move on.*
A) 56 g NH3 can be dissolved in 100 g of water at °C
B) At 50°C, 166 g of KNO, can be dissolved in g of water to make a saturated
solution
C) At 76°C, KCI and HCI have the same solubility. What mass of each could be dissolved in
80 g of water?
Your answer
This is a required question
Back
Next
Answers
Answer:ee
Explanation:
Two people perform work moving boxes into a moving truck. Which of the following statements best explains how one can
have more power than the other?
O One person performs the work in less time than the other.
One person performs the work in more time than the other.
One person performs more work over a longer time than the other.
O One person performs less work in less time than the other.
Answers
The correct statement is one person performs the work in less time than the other.
What is power?Power is a measure of the rate at which work is done. It is calculated by dividing the amount of work done by the time taken to do the work.
P = E/t
where;
E is the energy or work donet is the timeTherefore, if two people are moving boxes into a moving truck, the person who moves more boxes in a shorter amount of time has more power than the other person.
Thus, the correct statement will be "One person performs the work in less time than the other" which best explains how one can have more power than the other.
Learn more about work done here: https://brainly.com/question/8119756
#SPJ1
the two molecules below are isomers. a pure sample of which liquid would have the highest boiling point.
Answers
O-dichlorobenzene is the isomer of dichlorobenzene which has highest boiling point.
The boiling point of o-dichlorobenzene is greater than the boiling point of m -and p-dichlorobenzenes due to its greater polar nature. The boiling point order is: o−>m−>p− dichlorobenzene.
What is boiling point?
Boiling point, the temperature at which the pressure exerted by the surroundings on a liquid equals the pressure exerted by the vapor of the liquid; under these conditions, the addition of heat has the effect of converting the liquid into its vapor without raising the temperature.At any temperature, the liquid partially evaporates into the space above it until the pressure exerted by the vapor reaches a characteristic value called the vapor pressure of the liquid at that temperature.As the temperature increases, the vapor pressure increases; at the boiling point, vapor bubbles form in the liquid.To know more about boiling point, click the link given below:
https://brainly.com/question/28986258
#SPJ4
How many grams of water (H2O , GFW = 18.02 g/mol) will be produced when 35.8 grams of calcium hydroxide (Ca(OH),
„GFW = 74.10 g/mol) reacts with hydrochloric acid?
Answers
17.42 grams of water (H₂O) will be produced when 35.8 grams of calcium hydroxide (Ca(OH)₂) reacts with hydrochloric acid.
Given,
Mass of calcium hydroxide (Ca(OH)₂) = 35.8 grams
Molar mass of calcium hydroxide (Ca(OH)₂) = 74.10 g/mol
Molar mass of water (H₂O) = 18.02 g/mol
The balanced equation for the reaction between calcium hydroxide and hydrochloric acid is: Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
For every 1 mole of calcium hydroxide that reacts, 2 moles of water are produced.
Moles = Mass / Molar mass
Moles of Ca(OH)₂ = 35.8/ 74.10 ≈ 0.483 mol
Moles of H₂O = 2 × Moles of Ca(OH)₂ = 2 × 0.483 = 0.966 mol
Mass = Moles × Molar mass
Mass of H₂O = 0.966 × 18.02 ≈ 17.42
Learn more about hydrochloric acid, here:
https://brainly.com/question/24784580
#SPJ1
What mass of water can be heated from 15.0° C to 43.1° C by the addition of 1282 J?
Answers
The mass of water that can be heated from 15.0° C to 43.1° C by the addition of 1282J is 10.9grams.
How to calculate mass?The mass of water can be calculated using the following expression;
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureAccording to this question, a sample of water can be heated from 15.0° C to 43.1° C by the addition of 1282J. The mass of the substance can be calculated as follows;
1282 = m × 4.184 × (43.1 - 15)
1282 = 117.57m
m = 10.9grams
Learn more about mass at: https://brainly.com/question/31584398
#SPJ1
Sometimes a simple incident in our lives can actually have a deeper meaning and impact on us than might be apparent at the time. Write a reflective narrative about a memorable experience in your life.
Answers
I remember the day when I was walking to the grocery store and saw an elderly woman sitting on the sidewalk with her cart. She looked tired and was trying to catch her breath. At first, I walked past her, not wanting to get involved. But then something made me stop and turn around. I approached her and asked if she needed any help. She told me that she had been walking for a while and needed to rest for a bit. I helped her sit down on a nearby bench, and we started talking.
As we talked, I learned that her name was Mary, and she had lived in the neighborhood for over 50 years. She shared stories of her life and her struggles, and I listened with empathy. I could see the gratitude in her eyes, and it made me realize the power of human connection.
That experience taught me that we should never underestimate the impact of a simple act of kindness. It made me more aware of the people around me and more willing to help others in need. It also showed me the importance of empathy and how it can make a difference in someone's life.
Looking back, that moment was a turning point for me. It made me more compassionate and more aware of the needs of others. It showedme that a small gesture of kindness can have a ripple effect and make a big difference in someone's life. It also reminded me that we all have our own stories and struggles, and sometimes all we need is someone to listen and show us a little empathy.
Since that day, I have made it a point to be more aware of the people around me and to offer help whenever I can. Whether it's holding the door open for someone or offering a listening ear, I try to be more present and empathetic in my interactions with others.
That experience also taught me the importance of slowing down and taking the time to connect with people. In our fast-paced world, it's easy to get caught up in our own lives and forget about those around us. But by taking the time to connect with others, we can create meaningful relationships and make a positive impact in the world.
Overall, that simple encounter with Mary taught me a valuable lesson about the power of empathy and human connection. It's a lesson that I will always carry with me and strive to live by in my daily life.
In English, you're asked to write a reflective narrative about a life event with a deeper impact than initially visible. Describe the event, your reaction, its deeper meaning, and how it shaped you.
Explanation:This question pertains to reflective writing, a style typically used in English subject coursework. The task is about developing a narrative based on a memorable experience in your life that had a deeper impact than initially visible. Begin by selecting an event, which while appearing simple, had profound implications in retrospect. Describe the event in detail (who, what, where, when), discussing your personal reaction at the time. Then, explain its deeper meaning or the impact it had on you. Drawing conclusions about how this event shaped your perspectives or behaviours would constitute the reflective element of your narrative.
Learn more about Reflective Narrative here:https://brainly.com/question/33018651
#SPJ2
What was the major organic product obtained when propanal was heated with a catalytic amount of KOH in water
Answers
Answer:
Commercially, 2-methylpentenal is synthesized by the aldol condensation of propanal in the presence of liquid base like KOH or NaOH in stoichiometric amount,,. Under optimum reaction conditions, 99% conversion of propanal is achieved with 86% selectivity of 2-methylpentenal using liquid base.
Explanation:
hope this helps
Answer:
HMM, what the person above said.