What is the answer for this question?

Heat required : Q = 83500 J = 83.5 kJ

Given

mass ice = 250 g at 0°C

Required

The heat required

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Lf=latent heat of fusion

Input the value :

Q = 250 g x 334 J/g

Q = 83500 J

Answer:

K = 30N/m

Explanation:

We use this equation:

F= k∆x

Where ∆x refers to the amount or stretch or compression and k is the spring constant.

F = force

k = spring constant

∆x = change in length of spring

We don't know the value of k, so we make k the subject:

k = F/∆x

k = 6N x 0.2m

k = 30N/m

Once a digital recording is made, the bandwidth is set in place. An analog recording is considered unlimited. Therefore, it can move to a higher and higher resolution without losing its original quality.

In order to properly measure the displacement, the object must be completely submerged, however in the diagram the wood is floating. So the measured displacement will only be a fraction of what it actually is.

Answer:

A

Explanation:

particles are frozen and hence will vibrate in their fixed positions

Answer:

30.6 L

Explanation:

Given data:

Number of molecules of nitrogen = 8.23×10²³ molecules

Volume occupy at STP = ?

Solution:

Standard temperature = 273.15 K

Standard pressure = 1 atm

One mole of any substance at STP occupy 22.4 L volume.

Number of moles of nitrogen:

1 mole contain 6.022×10²³ molecules.

8.23×10²³ molecules × 1mol / 6.022×10²³ molecules

1.37 mol

Volume of nitrogen:

1.37 mol × 22.4 L / 1 mol

30.6 L

Answer:

The sun is at the (edge) of our solar system

and is much (hotter) than anything else in the solar system (95%) of the entire mass of the solar system is contain in the sun

Answer:

3.15N

Explanation:

We use this equation:

F= k∆x

Where ∆x refers to the amount or stretch or compression and k is the spring constant.

F = force

k = spring constant

∆x = change in length of spring

To find the value of F:

F= k∆x

F= 12.6x0.25

F= 3.15N

Answer:

The melting/boiling point of a substance determines what state of matter it takes at a certain temperature.

In Cl2 there are covalent bonds between the atoms forming simple molecules. There are weak attractions between molecules of Cl2 meaning little energy is needed to break these forces of attraction and therefore Cl2 has a low boiling point.

NaCl on the other hand has strong electrostatic forces of attraction between the positvely charged Na ion and the negatively charged Cl ion. NaCl forms a giant ionic lattice that requires high amounts of energy to break and therefore has a high melting point.

Answer:

answer is A.) Water

Answer:

a) water

have a good day!

Answer:

0.84

Explanation:

total heat energy =mass ×specific heat capacity (4.2kJ)×temp change

mass=25g convert to kg to get 0.025

specific heat capacity is 4.2

temp change=36.0-24.0=8.0

q = mC∆T

m=25.0

c=24.0

ΔT=36.0

25.0 * 24.0 * 36.0 = 21,600 jules

The equation q =   MC ∆ T, where m is the sample mass, c is the specific heat, and  ΔT is the temperature change, can be used to determine the amount of heat acquired or lost by a sample (q).

How can you figure out how much energy was consumed?

This is simple to perform; to calculate the amount of heat absorbed, multiply the substance's heat capacity by its mass and the temperature change.

The specific heat capacity of a substance is the amount of energy needed to raise the temperature of 1 gram of that substance by 1 degree Celsius. With a value of 4.18 J/g/°C, water has one of the highest heat capacities.

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Answer:

It is position 3

Explanation:

Because the further the magnets are the higher the potential energy, and in position 3 the globe is the furthest from the base meaning that in base 3 the magnetic potential energy is the highest or greatest there.

Answer: 0.02 moles

Explanation:

The number of moles in 4.38 g of AgNO₂ is equal to 0.028 mol.

A mole can be described as a standard unit that can be utilized to calculate a given number of particles. The constituents counted are usually individually distinct but identical entities.

A mole of the substance can be used to calculate quantities of atoms, molecules, ions, or other particular particles. The quantity of matter can be described as measured by elementary entities.

The number of constituents present in one mole is equal to 6.023× 10 ²³ which is known as Avogadro’s constant.

Given, the mass of AgNO₂ = 4.38 g

The mass of one mole of AgNO₂ =  153.87 g

The number of moles of in 4.38 g of AgNO₂ = 4.38/153.87 = 0.028 mol

Therefore, the number of moles of  AgNO₂ is equal to 0.028 mol.

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Answer:

ok, maybe draw like a few plants and dear, you know and draw them out of cells, like the shape. so like a bunch of cells together making the shape of a deer or plant and stuff. i hope this helps

Explanation:

Answer:

According to Bohr, the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. ... The electron with its extra packet of energy becomes excited, and promptly moves out of its lower energy level and takes up a position in a higher energy level. This situation is unstable, however.

Answer:

+2

Explanation:

Ba is present in group 2 and group 2 show + oxidation state

Answer:

The speed of oxygen production is bigger in the first attempt.

Explanation:

In the first attempt, since 75ml oxygen is produced in 3 minutes, the rate of oxygen production is r = volume of oxygen/time = 75 ml/3 min = 25 ml//min

In the second attempt, since 100ml oxygen is produced in 5 minutes, the rate of oxygen production is r' = volume of oxygen/time = 100 ml/5 min = 20 ml//min

Since r = 25 ml/min > r' = 20 ml/min, the speed of oxygen production is bigger in the first attempt.

Answer:

We are not able to create a fusion reactor on Earth because fusion energy production is not based on a chain reaction, as is fission. Plasma must be kept at very high temperatures with the support of external heating systems and confined by an external magnetic field.

Explanation:

Answer:

No

Explanation:

The element calcium be found in more than one state of matter ( Only in Solid state )

#HopeItHelps

Answer:

the answer to this problem is before

Explanation:

Answer:

ih2706

Explanation:

Answer:

double displacement (metathesis) hope that helps!(^_^メ)

Explanation:

meh.

Answer:

all of them

Explanation:

took test

Floods can cause soil erosion and sedimentation. It will destroy all the properties of human beings. All the options are correct. Thus the correct option is D.

Flood is defined as a natural disaster which results from the overflow of water on land. It is mainly generated by the heavy rainfall, sudden snow melt, etc. It affect the ecosystem adversely.

The floods are mostly affected to the coastal regions. It is even a threat to life of people. The habitat of aquatic organisms are destructed by the floods. The ground water is found to be contaminated with pathogenic microbes and causes water borne diseases.

As a result of floods the life of small insects which play a primary role in the ecosystem of food chain is also affected. All fields like education, communication, transport, etc. of our state is affected by the floods.

The floods can cause loss of people, low water quality, destruction of habitats. Some times the effect of flood in our life will be long lasting.

Thus the correct option is D.

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Answer:

Average atomic mass of E = 103.57 amu

Explanation:

Given data:

Average atomic mass of E = ?

Abundance of E-102.658 = 56.67%

Abundance of E-104.770 = 43.33%

Solution:

Average atomic mass of E = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass of E = (56.67×102.658)+(43.33×104.770) /100

Average atomic mass of E =  5817.63 + 4539.68 / 100

Average atomic mass of E = 10357.31 / 100

Average atomic mass of E = 103.57 amu.

Answer:   The final stage of the life cycle of a tree is when it has fully grown and reached the ... You should be confident in your supplier's approach to sustainability. ... This is the first occasion you will see a stem and perhaps a couple of leaves. ... The next phase is the sapling stage, this is when the sprout continues to grow and has ...

Explanation:

Answer:

b. a meadow replacing a pond in it's flood plain

Explanation:

I'ts a secondary succession.

Answer:

Hydrogen has three naturally occurringisotopes: 1H (protium), 2H (deuterium), and 3H (tritium). Other highly unstable nuclei (4H to 7H) have been synthesized in the laboratory, but do not occur in nature. The most stable radioisotope ofhydrogen is tritium, with a half-life of 12.32 years.