How many joules of energy are required to melt 125 g of water?

Answers

Answer 1

Answer for this question is 45,000

Answer 2

Energy is referred to by scientists as the capacity for work. People have figured out how to transform energy from one form to another and then use it to accomplish tasks, making modern civilization possible.

Explain about the energy?

Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.

Energy can take on a variety of shapes. Examples of these include: electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, mechanical energy, gravitational energy, and so on. Each form has the ability to shift or transform into the others.

The sun is one of the most significant energy sources. Most of the energy on earth comes from the sun, which is where it all began. We get

Answer for this question is 45,000

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Related Questions

Please hurry!!!!!!!!!!
Due tomorrow


Which pair of properties describes the elements in Group 18?

F They are chemically stable and liquid at room temperature.

G They have eight valence electrons and are flammable

H They are magnetic and boil at low temperatures.

J They are gaseous at room temperature and chemically stable.

Answers

Answer:

G

Explanation:

They have eight valence electrons and are flammable

*not sure about this answer

Explanation:

the correct answer is C

hope it helps you

While studying bacterial cells, scientists measure the lengths of the cells in one colony. The chart shows their data. The scientists notice that one measurement stands out. How should the scientists best deal with this measurement?

Answers

Answer:

The scientists should best deal with this measurement by stating that there was an error during measuring and collect further data.

Which statement is true about matter?
a: all matter has volume
b: all matter has mass
c: both A and B.
d: all mater has either volume or mass but not both​

Answers

Answer:

C

Explanation:

This is because matter is anything that has mass and occupies space.Therefore the space occupied by matter is volume


What is the atomic mass of sulfur (S)?

Answers

Answer:

atomic mass of sulfur is 32.06 g/mol

Explanation:


Catalysts help reactions happen more easily. This graph shows the energy of
a reaction without a catalyst. Which graph shows the energy of the same
reaction with a catalyst?

Answers

Answer:

D.

Explanation:

Catalysts are substances that increase the rate of a reaction i.e. make it faster. Catalysts do this by reducing the activation energy needed for a reaction to occur.

According to the image in this question, a graph showing the energy of a reaction without a catalyst is displayed. This means that a longer time will be spent. However, with a catalyst, the activation energy will reduce as seen in the image in option D.

What is one way to prevent soil erosion?
A. Plant trees
B. Plow fields
C. Spray weed killer.
D. Remove mulch.

Answers

B I’m to lazy to explain

its a plant trees

(need character limit)

hii pls help me to balance chemical equations

ammonia + oxygen ------> nitrogen + water​

Answers

Answer:

Explanation:

Ammonia = NH3

Oxygen = O2

When these two (2) chemical elements react together, they form two chemical compound which are nitrogen oxide and water.

NH3 + O2 -----> NO + H2O

We would balance the chemical equation like this;

NH3 + 3O2 -----> 4NO + 2H2O

The graph shows the change in concentration of one of the species in the reaction
A + B + C→D.

If the graph indicates the reaction rate, then the concentration of which species is plotted?

A

B

C

D

Answers

Answer:

its D

Explanation:

Took the test

The specie whose concentration is plotted is D. The rate of reaction is how quickly or slowly hat a reaction proceeds.

Rate of  reaction

The term rate of reaction refers to how quickly or slowly hat a reaction proceeds. A reaction rate plot involves the concentration of the species plotted against time.

Now we can see from the plot that concentration is increasing with time. Since the concentration of products increases with time, then the specie whose concentration is plotted is D.

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please help I will mark as brainliest!!and explain.
what mass of copper(ii) oxide would react completely with 500cm3 of a 0.5M dilute sulphuric acid.​

Answers

The reaction that will take place is:

CuO + H₂SO₄ → CuSO₄ + H₂O (balanced)

Amount of Sulphuric acid provided:

we have 500 mL of a 0.5 molar solution of Sulphuric acid           (1 cm³ = 1mL)

We know that molarity is found with the formula:

Molarity = Number of Moles / Volume (in L)

let's plug the given values

0.5 = Number of moles / 0.5 L

Number of moles = 0.25 moles              [multiplying both sides by 0.5]

Amount of CuO reacted:

from the balanced equation, we know that CuO reacts with H₂SO₄ in a 1:1 ratio (1 mole of CuO reacts with 1 mole of H₂SO₄)

so 0.25 moles of H₂SO₄ (present in the solution) will react with 0.25 moles of CuO

Mass of 0.25 moles of CuO:

molar mass of CuO = 80 grams/mol (approx.)

we are aware of the relation:

Number of moles = Given mass / Molar mass

plugging the values we have:

0.25 = Mass / 80

Mass = 20 grams                               [multiplying both sides by 80]

Hence 20 grams of CuO will react

molecular formula of ammonium nitrite using cris method

Answers

Answer:

By using the criss cross method,the -1 charge of nitrate ion is shifted to ammonium ion and +1 charge of ammonium ion is shifted to nitrate ion. In this way, the final formula NH4NO3 is formed for the ammonium nitrate.

If the velocity of a body is decreased to 1/2, then K.E. of the body decreases to​

Answers

Answer:

1/4th

Explanation:

KE = .5mv^2

So when we decrease the velocity by half, we end up losing three fourths of net energy due to that value being squared.

Answer:

The Kinetic Energy is reduced to 1/4 of the original K. E.

Explanation:

K. E. = 1/2 m v^2

If v becomes v/2 we have:

K E. = 1/2 m (v/2)^2

= 1/2 m v^2/4

So dividing the 2:

we get  1/2 m v^2/4 /  1/2 m v^2

= v^2/4 / v^2

= v^2 / 4v^2

= 1/4.

why is it important of having regular supervision of the market?

Answers

Supervision of weights and measures promotes accurate measurements of goods and services to ensure that everybody gets a fair trade in the marketplace. Not so coincidentally it also is a deterrent to ensure that traders are being honest in their trade practises.

(07.01 MC)
A potential energy diagram is shown.
70
60
Products
50
40
Potential Energy (kJ)
30
Reactants
20
10
0
Reaction Pathway
What is the activation energy of this reaction? (5 points)

Answers

Answer:

the activation energy is 65-30

35

The activation energy of this reaction is 35 kJ.

What is activation energy?

Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport.

The activation energy is equal to the difference between the threshold energy needed for the reaction and the average kinetic energy of all the reacting molecules.

The activation energy of a reaction is the difference in energy between the threshold energy and energy of the reactants.

Given,

The highest energy for a reaction to happen = Threshold energy = 65 kJ

Energy of the reactants = 30 kJ

Therefore, The activation energy of this reaction is 35 kJ.

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Write the formula for each compound

a. Chromium(III) sulfite

b. Magnesium hypochlorite

c. Nickel(II) nitrate hexahydrate

Answers

Answer:

Chromium(III) Sulfite Cr2(SO3)3 Molecular Weight

Mg(ClO)2 - PubChem

Ni(NO3)2

What makes a strong acid different from a weak acid?

Answers

Answer:

D. A strong acid dissociates more completely than a weak acid.

Explanation:

A P E X

Name the following bases.
Fe(OH)3
- iron(III) hydroxide
- iron(II) hydroxide
- iron hydroxide

Answers

Answer:

1

Explanation:

Ferric Hydroxide

3. 1

Fe. (OH)

Fe(OH)3

Answer:

iron(III) hydroxide

Explanation:

I just took the quiz!

Find the number of moles of sodium hydroxide in 25cm3 solution of concentration 0,1 mol/dm3​

Answers

Answer:

0.0025  moles

Explanation:

25cm^3 = 25/1000 dm^3

Conc = mol/dm^3

Mol = conc * dm^3

Mol = 0.1 * 25/1000

Plz Help I have One more time To retake and I can't fail it..​

Answers

[tex]option(a)[/tex]

Explanation:

You answer is correct as you move from left to right across a period. But, the question is asked regarding to the right to left across a period. So, as you move from right to left across a period, you can find firstly Non-metals, secondly Metalloids, and lastly Metals.

A galaxy that has an undefined shape is best classified as a(n)
galaxy.

Answers

Answer:

irregular galaxy

pls give brainliest :)

Answer:

irregular galaxy

it is undefined shape

Question:
Nearly the entire world uses the metric system for their measurements. The US is one in of three countries that does not use metric. Would you support changing school curriculum to teach the metric system as the primary measurement system in the US? Why or why not.
(It must be 3-5 sentences long please)

Answers

Answer:

I would

Explanation:

I would support the change to the metric system only because it allows children to understand smaller forms of units and measurements. Also, it will allow people in the math and science fields to broaden their knowledge of equations and formulas. Meaning that the scientist and mathematicians will be able to solve more problems in the world right now.  Overall, the education system for the children of the United States would benefit from the change in the measurement system.

A sample taken from a layer of mica In a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. How much potassium-40 was in the sample originally if the half-life of potassium-40 is 1.3 billion years? A. 4.20 g B. 8.40 g C. 12.6 g D. 16.8 g the E. 25.2 g ​

Answers

[tex]\huge\bold\pink{hello!!!}[/tex]

HERE IS UR ANSWER

_____________________

option b) is correct answer.

Seeds are organs within the reproductive system of plants. How is the spreading of seeds important to the survival of an organism?
A. An organism must reproduce in order to find a suitable place to live.
B. Although a single organism can survive without reproducing, organisms must reproduce in order to ensure the survival of the species.
C. Although a single organism can survive without reproducing, the organism must spread its seeds in order to protect itself from disease.
D. An organism must reproduce in order to absorb nutrients from the environment. SUBMIT​

Answers

Answer:

Although a single organism can survive without reproducing, organisms must reproduce in order to ensure the survival of the species.

The characteristics of a certain gas are listed in the table.

What is the expected density of the above sample of gas?
A - 3.16 g/L
B - 1.58 g/L
C - 1.21 g/L
D - 1.03 g/L

Answers

Answer:

Option A. 3.16 g/L

Explanation:

We'll begin by calculating the molar mass of Cl₂. This can be obtained as follow:

Molar mass of Cl₂ = 2 × 35.45

= 70.9 g/mol

Finally, we shall determine the density of Cl₂. This can be obtained as follow:

Molar mass of of Cl₂ (M) = 70.9 g/mol

Pressure (P) = stp = 1 atm

Temperature (T) = stp = 273 K

Gas constant (R) = 0.0821 atm.L/Kmol

Density (D) =?

D = PM / RT

D = (1 × 70.9) / (0.0821 × 273)

D = 70.9 / 22.4133

D = 3.16 g/L

Thus, the density of the gas is 3.16 g/L.

how to prepare hydrogen gas​

Answers

1. Natural Gas Reforming/Gasification: Synthesis gas, a mixture of hydrogen, carbon monoxide, and a small amount of carbon dioxide, is created by reacting natural gas with high-temperature steam. ...

2. Electrolysis: An electric current splits water into hydrogen and oxygen.

Hope this helps :))

HELP ME ASAPPPP PLZZZZZ!!!!!
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 16.8 moles of methane, CH4 ?

Answers

The answer is going to be 2.40g

How does peer review affect research?
A. Experimental results will be trusted by the scientific community
only if they have been peer-reviewed.
B. Experimental results will be published only before they have been
peer-reviewed.
C. An experiment will not be repeated by others if it has been peer-
reviewed.
O D. Experimental results are possible only if they have been peer-
reviewed.

Answers

Answer:

A: Experimental results will be trusted by the scientific community

only if they have been peer-reviewed.

Explanation:

It is NOT C as I have tried it, it did not work and makes no sense.

Drawing a conclusion derived from knowledge of an established principle is called deductive reasoning.
True
False

Answers

Answer:

the answer would be true

Answer:

false

Explanation:

cos the principle is established or known so it will not be a deductive or low reasoning

What effect does the electrostatic force have?
- Particles without charge repel each other.
- Particles of different masses repel each other.
- Particles of opposite charge repel each other.
- Particles of the same charge repel each other. (ANSWER)

Answers

D

Explanation:

Particles of the same charge repel each other

Balance the following equations by inserting the proper coefficients.

CH4 +
O2 CO2 +
H2O

CaCl2 +
AgNO3 Ca(NO3)2 +
AgCl

C2H6O +
O2
CO2 +
H2O

Answers

Answer:

2, 2, 2, 2, 3, 2, 3

Explanation:

The coefficient of the equation (i) CH₄ + O₂ → CO₂ + H₂O are 2, 2 the coefficient of equation (ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl are 2, 2  and the coefficient of equation (iii) C₂H₆O + O₂ → CO₂ + H₂O are 3, 2, 3.

What is Balanced Chemical Equation ?

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Here the given equations are

(i) CH₄ + O₂ → CO₂ + H₂O

(ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl

(iii) C₂H₆O + O₂ → CO₂ + H₂O

Now balance the equation (i)

CH₄ + O₂ → CO₂ + H₂O

Reactant side             Product Side

C = 1                              C = 1

H = 4                             H = 2

O = 2                             O = 3

In the reactant side there are 4 H atoms and in product side there are 2 H atoms are present. So multiply by 2 in the product side to balance the H atoms.

CH₄ + O₂ → CO₂ + 2H₂O

Reactant side             Product Side

C = 1                              C = 1

H = 4                             H = 4

O = 2                             O = 4

In the reactant side there are 2 O atoms and in product side there are 4 H atoms are present. So multiply by 2 in the reactant side to balance the O atoms.

CH₄ + 2O₂ → CO₂ + 2H₂O

Reactant side             Product Side

C = 1                              C = 1

H = 4                             H = 4

O = 4                             O = 4

Here we can see that the equation is balanced. The coefficient are 2, 2.

Now balance the equation (ii)

CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl

Reactant side             Product Side

Ca = 1                             Ca = 1

Cl = 2                              Cl = 1

Ag = 1                              Ag = 1

N = 1                                N = 2

O = 3                               O = 6

In the reactant side there are 2 Cl atoms and in product side there is 1 Cl atom is present. So multiply by 2 in the product side to balance the Cl atoms.

CaCl₂ + AgNO₃ → Ca(NO₃)₂ + 2AgCl

Reactant side             Product Side

Ca = 1                             Ca = 1

Cl = 2                              Cl = 2

Ag = 1                              Ag = 2

N = 1                                N = 2

O = 3                               O = 6

In the reactant side there is 1 Ag atom and in product side there are 2 Ag atoms are present. So multiply by 2 in the reactant side to balance the Ag atoms.

CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl

Reactant side             Product Side

Ca = 1                             Ca = 1

Cl = 2                              Cl = 2

Ag = 2                             Ag = 2

N = 2                               N = 2

O = 6                               O = 6

Here we can see that the equation is balanced. The coefficient are 2, 2.

Now balance the equation (iii)

C₂H₆O + O₂ → CO₂ + H₂O

Reactant side             Product Side

C = 2                              C = 1

H = 6                              H = 2

O = 3                              O = 3

In the reactant side there are 2 C atoms and in product side there is 1 C atom is present. So multiply by 2 in the product side to balance the C atoms.

C₂H₆O + O₂ → 2CO₂ + H₂O

Reactant side             Product Side

C = 2                              C = 2

H = 6                              H = 2

O = 3                              O = 5

In the reactant side there are 6 H atoms and in product side there are 2 H atoms are present. So multiply by 3 in the product side to balance the H atoms.

C₂H₆O + O₂ → 2CO₂ + 3H₂O

Reactant side             Product Side

C = 2                              C = 2

H = 6                              H = 6

O = 3                              O = 7    

In the reactant side there are 3 O atoms and in product side there are 7 H atoms are present. So multiply by 3 in the reactant side to balance the O atoms.

C₂H₆O + 3O₂ → 2CO₂ + 3H₂O

Reactant side             Product Side

C = 2                              C = 2

H = 6                              H = 6

O = 7                              O = 7        

Here we can see that the equation is balanced. The coefficient are 3, 2, 3.

Thus, we can say that the coefficient of the equation (i) CH₄ + O₂ → CO₂ + H₂O are 2, 2 the coefficient of (ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl are 2, 2  and the coefficient of equation (iii) C₂H₆O + O₂ → CO₂ + H₂O are 3, 2, 3.

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“during times of personal crisis we may feel the need to engage the services of a therapist to help us with out problems”

fact or opinion and why

Answers

Answer:

That is a fact.

Explanation:

A therapist can help support you going forward and when in a personal crisis.

A therapist can help us mentally during a personal crisis. This is a fact. because there are personal therapist who helps us to recover from negative thoughts and mental illness.

What is psychotherapy?

Individual psychotherapy is the use of psychological techniques to address emotional and personality issues or disorders. In other words, there are treatments that assist in treating emotional disorders in a manner similar to how a doctor would treat a fever or cold.

Milder emotional conflicts to serious psychopathologies might all be a part of these issues. As a result, both those who are depressed and those who are having marital problems can seek counselling.

The problems  that can be healed through psychotherapy include difficulties coping with stressors , trauma and related experiences,   mental illnesses such as depression, anxiety an so on.

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NaC2H3O2 product or reactant Convertir 25 km/h a m/s What is the pH of a 1.0 x 10-3 M KOH solution?A. 10B. 4.0C. 11D. 3.0 Sample essay for college applications in a natural conversation style using vivid words and images The law of comparative advantage says that a person should produce a good if he or she: Group of answer choices can produce the good at the same cost as another producer can. receives the highest marginal benefit from the good. has an absolute advantage in producing the good. has the lowest opportunity cost of producing the good. has the greatest desire to consume the good. Subtract the second equation from the first. How many counting numbers have three distinct nonzero digits such that the sum of the three digits is 7? Principal axis is the:________a. straight line drawn from the center of curvature to the mid point of the mirror.b. straight line drawn from the center of curvature to a point on the outer edge of the mirror.c. straight line drawn from the center of curvature to any point of the mirror.d. straight line joining any two points on the mirror.e. None of the other answers given is correct. I am a 3D object.I have four triangular faces and four vertices.What am I? For February, sales revenue is $250,000; sales commissions are 6% of sales; the sales manager's salary is $50,000; advertising expenses are $15,000; shipping expenses total 1% of sales; and miscellaneous selling expenses are $1,000 plus 1/2 of 1% of sales. Total selling expenses for the month of February are:_______.a. $65,000.b. $69,750.c. $82,250.d. $84,750. On the following composite figure, all angles are right angles. All short edges of the figure have a measure of 1.5 centimeters. All long edges have a measure of 3 centimeters. Find the area of the figure. Explain or show how you got your answer. A 12oz box of cereal costs $3.50. An 18oz box of cereal costs $5.40 Set up eqautions to determine which is the better buy? what is the meaning of FLOCCINAUCINIHILIPILIFICATION. The triangles are similar.What is the value of x?Enter your answer in the box.x = The midpoint of a segment is (6,4) and one endpoint is (13,2). Find the coordinates of the other endpoint.A. (-1, -6)B. (-1, 0)C. (20, -6)D. (20, 0) First one gram equals 1000 grams, so a 39 kilogram equals 39000 grams. Then, 1000 pillows times 300 equals a 39 kilogram sofa. Is my answer correct? A market surveyor wishes to know how many energy drinks teenagers drink each week. They want to construct a 98% confidence interval for the mean and are assuming that the population standard deviation for the number of energy drinks consumed each week is 1.1. The study found that for a sample of 1027 teenagers the mean number of energy drinks consumed per week is 5.9. Construct the desired confidence interval. Round your answers to one decimal place. 10x^3/5x^2 2/x. 2x 2 x/2 Difference between array processor and vector processor Mr. Atkinson manages playgrounds for the 8 elementary schools in the Franklin School District. This year, he wants to put new sandboxes at each of the schools. He estimates that he will need 3 tons of sand for this project. How many 50-pound bags of sand should he order for each school?