A student who is feeling cold rapidly rubs their hands on their bare arms. What energy transformation is the student using to feel warmer?

A.
mechanical ---> thermal

B.
radiant ---> thermal

C.
thermal ---> chemical

D.
electrical ---> thermal

Answer:

obsidian

Explanation:

because it is an igneous rock which is smooth

Answer:

B) Obsidian

Explanation:

Since the igneous glass last not very long like you could say obsidian compared to normal ones.

Answer:

Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions.

Explanation:

Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions. These reactions where chemicals are broken down are called “catabolism” – the destructive part of metabolism. By contrast, reactions where chemical bonds are formed are often endergonic.

The number of moles : 6.2 x 10¹¹

The mole is the number of particles contained in a substance

1 mole = 6.02.10²³  particles

[tex]\tt N=n\times No[/tex]

N = number of particles

n = moles

No = Avagadro's number : 6.02.10²³

3.73 x 10³⁵ atoms of S

the number of moles :

[tex]\tt \dfrac{N}{No}=\dfrac{3.73\times 10^{35}}{6.02\times 10^{23}}=6.2\times 10^{11}[/tex]

Answer: In fact, all of the major landforms that we find on the continents ... Mid-ocean ridges, also called seafloor-spreading centers, are long, ... 1 km = 100,000 cm or 1 x 105 cm ... a mid-ocean ridge with a SLOW spreading rate (1 to 5 cm/yr, full rate).

Explanation:

As the Earth's tectonic plates separate, new ocean bottom is generated along divergent plate borders, which are known as mid-ocean ridges. Massive basalt volcanic eruptions result from molten rock rising to the seafloor as the plates divide.

To learn more about Mid-ocean ridge, refer to:

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Answer:

I think it's Hydrogen is equal to aCalcuim plus b

Answer:

Chlorine has higher Electron Affinity as compared to Bromine

Explanation:

Electron affinity is defined as the Potential energy change of the atom when an electron is added to a neutral gaseous atom. Therefore, more the Negative electron affinity, more favorable will be the electron addition process.

The electron affinity of Chlorine is -349kJmol^-1

The electron affinity of Bromine is -324.6KJmol^-1

This clearly shows that Chlorine is a much better Atom to be bonded with, That is the reason why in the reaction is not feasible.

[tex]Br2(aq) + 2NaCl(aq)[/tex] →[tex]Cl2(aq) + 2NaBr(aq)[/tex]

Therefore, Chlorine has higher electron Affinity as compared to Bromine and that what makes it a much better atom to be bonded with Na. So the above reaction is not possible.

Answer:

The correct answer is 0.277 M HCl

Explanation:

NaOH is a strong base and HCl is a strong acid. NaOH reacts with HCl to form a salt (NaCl) and water via a neutralization reaction, as follows:

NaOH + HCl → NaCl + H₂O

At the equivalence point, the moles of NaOH added is equal to the moles of HCl present in the solution to be titrated. Moreover, the moles can be calculated as the product of the concentration of base or acid (Cb or Ca) and the volume (Vb and Va), as follows:

moles NaOH = moles HCl

Cb x Vb         =  Ca x Va

Thus, we calculate the concentration of HCl (Ca), as follows:

Ca = (Cb x Vb)/Va = (0.146 M x 47.5 mL)/(25.0 mL)= 0.277 M

Answer:

The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation.

Answer:

d. condensation of water

Answer:

I believe the answer is D). condensation of water.

Hope this helps, have a great day/night and stay safe!

Answer:

Germanium

Explanation:

Answer:

Sodium Sulfide

Explanation:

I looked it up

Answer:

A

Explanation:

Answer:

its the first one because all together it has to have ten square things

Answer:

2Fe + 3Cl=2FeCl3 therefore the coefficent for Fe is 2.

Explanation:

Answer:

message on messenger johnpatrick , so I can give help you

If u click on all of them it gives u an A+ and doesn’t even read what u wrote. So u never really have to try hard on the writing parts just tell them u included them all

Answer:An image will not be formed.

Rays do not converge to or diverge from a common point.

/select all that apply

Explanation:

Answer:

the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize

Explanation:

hope this helped

Answer:

The sum would be 69109.4944 ml if that's what you were asking

Answer:

It is the intermolecular forces acting between the molecules that cause attractions between them making them liquids or solids. The strength of Van der Waals forces depends primarily on the number of electrons in total in the molecule, so larger molecules will have higher boiling points.

Explanation:

Answer:

Mass = 13.42 g

Explanation:

Given data:

Molality of potassium chloride solution = 0.721 m

Mass of water = 255 g (255 g /1000 = 0.255 Kg)

Potassium chloride added = ?

Solution:

Molality:

Molality = number of moles of solute/ Kg of solvent

0.721 m = moles / 0.255 Kg

  m = mol/Kg

Moles = 0.721mol/Kg×0.255 Kg

Moles = 0.18 mol

Mass of potassium chloride:

Number of moles = mass/molar mass

0.18 mol = Mass /74.55 g/mol

Mass = 0.18 mol × 74.55 g/mol

Mass = 13.42 g

Answer:

Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons.

Explanation:

When electrons in atoms absorb energy, they move from a lower energy level to a higher energy level. With time, they revert to the their original energy state emitting a photon of light of appropriate wavelength.

The absorbed photons do not show up in the spectrum. They appear as dark lines in the spectrum. Hence, the absorption spectrum is the exact inverse of the emission spectrum. The  dark lines in the spectrum indicates that the colors that ought to occupied those points there have been absorbed.

Answer:

The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus (think of planets orbiting around the sun). ... He said that the energy of an electron is quantized, meaning electrons can have one energy level or another but nothing in between.

Explanation:

Answer:

Mass of water produced= 1.8 g

Explanation:

Given data:

Mass of water produced = ?

Mass of butane = 1.36 g

Mass of oxygen = excess

Solution:

Chemical equation:

2C₄H₁₀ +13 O₂       →   8CO₂ + 10H₂O

Number of moles of butane:

Number of moles = mass/molar mass

Number of moles = 1.36 g/ 58.12 g/mol

Number of moles = 0.02 mol

Now we will compare the moles of butane with water.

                 C₄H₁₀         :        H₂O

                  2              :           10

                 0.02          :         10/2×0.02 = 0.1 mol

Mass of water produced:

Mass = molar mass × molar mass

Mass = 0.1 mol × 18 g/mol

Mass = 1.8 g

Answer:

My group believes that Elisa has Staphylococcus Aureus. I think that she does have the manifestation of the colonies condition because she tested positive to clumping factor, coagulase, hemolysins and thermostable deoxyribonuclease, which are used to identify S aureus. Commercial latex agglutination tests conducted on her blood sample also tested positive to the S aureus. For further clarifications, my Group also used biotyping kits for the identification of S epidermidis for commercial confirmation.

However, the catalase test was conducted to distinguish streptococci (catalase-negative) staphylococci which are catalase positive. The test was performed by flooding an agar slant or broth culture with several drops of 3% hydrogen peroxide. Catalase-positive cultures bubble at once.

Explanation:

I have a question, is this in Edge 2020?

And anyway,

Hope this helped! :)

Answer:

1.62 L

Explanation:

T= 97+273.15= 370.15

R= 0.08206 atm/mol⋅K

V= 45 L

n= 2.4 mol

P= (n⋅R⋅T)/V

= (2.4 x 0.08206 x 370.15)/(45) = 1.61997 = 1.62

The pressure of the gas is 1.62 atm. This can be calculated by using ideal gas law that gives direct relation between P,V and T

This law states that pressure and volume are directly proportional to the temperature of the gas.

What information do we have?

T= 97+273.15= 370.15 K

R= 0.08206 atm/mol⋅K

V= 45 L

n= 2.4 mol

To find:

P=?

Ideal gas law is given by:

PV=n.R.T

P= (n⋅R⋅T)/V

P= (2.4 x 0.08206 x 370.15)/(45)

P= 1.61997

P= 1.62 atm

Thus, the pressure of the gas is 1.62 atm.

Find more information about Ideal gas law here:

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Answer:

6.02 X 1023 atoms of oxygen.

Explanation:

One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.

the number of oxygen atoms an oxygen molecule has is two oxygen atoms

Answer:

( -, + , + )

Explanation:

The sign of the change in entropy for

High pressure side , low pressure side and the Total of the two =

( -, + , + )

The expansion of the Higher pressure side of the chamber will lead to a negative (- )change in entropy while the contraction of the lower pressure side of the chamber will cause a positive ( + ) increase in the change of entropy

Answer:

answers

1. 3

2. Symbol

3. I cant see it

4.Chemical Equation

Explanation:

O3 means 3 atoms in oxygen

symbol because elements need symbols

Answer:

4.C, 5.D, 6.A, 7.A ,and is 8.A