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laiz [17]
3 years ago
7

Does melting lose or gain energy

Chemistry
2 answers:
kompoz [17]3 years ago
4 0
It gains energy because heat is energy
amid [387]3 years ago
4 0
Melting gains energy

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What is the effects of this pill naproxen
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6 0
3 years ago
Scandium forms the ion Sc3+. How many bromite ions could bind with Sc3t, and what would be the chemical formula?
ser-zykov [4K]

Answer:  3 bromite ions will bind with Sc^{3+} and the chemical formula will be Sc(BrO_2)_3.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here scandium is having an oxidation state of +3 called as Sc^{3+} cation and bromite is an anion with oxidation state of -1 called as BrO_2^-. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral Sc(BrO_2)_3.

Thus 3 bromite ions will bind with Sc^{3+} and the chemical formula will be Sc(BrO_2)_3.

8 0
4 years ago
. Through what three mechanisms do gamma rays interact with matter?
siniylev [52]

Answer:

Photoelectric effect, pair production and Compton scattering

Explanation:

Gamma rays, having no charge, can be slowed slowly by ionization as a material passes through. They suffer other mechanisms that eventually make them disappear, transferring their energy, they can cross several centimeters of a solid, or hundreds of meters of air, without undergoing any process or affecting the material they cross. Then they suffer one of the three effects and deposit much of their energy there. The three mechanisms of interaction with matter are: the photoelectric effect, the Compton effect and the production of pairs.

The photoelectric effect is that the photon meets an electron in the material and transfers all its energy, disappearing the original photon. The secondary electron acquires all the energy of the photon in the form of kinetic energy, and is sufficient to separate it from its atom and convert it into a projectile. This is stopped by ionization and excitation of the material

In the Compton effect the photon collides with an electron as if it were a clash between two elastic spheres. The secondary electron acquires only part of the energy of the photon and the rest takes it with another photon of lesser energy and diverted.

When an energy photon approaches the intense electric field of a nucleus, the production of pairs can happen. In this case the photon is transformed into an electron positron pair. Since the sum of the mass of the pair is 1.02 MeV, it cannot happen if the photon's energy is less than this amount. If the energy of the original photon is greater than 1.02 MeV, the surplus is distributed by the electron and the positron as kinetic energy, and the material can be ionized. The positron at the end of its path forms a positronium and then annihilates producing two annihilation photons, 0.51 MeV each.

3 0
3 years ago
Balance the following equation <br><br>C₂H₆O + O₂ → CO₂ + H₂O
Nadya [2.5K]

Answer:

C2H6O + 3O2 - > 2CO2 + 3H20

8 0
3 years ago
Hydrogenation of poly(butadiene) converts both cis and trans isomers to the same linear structure, and vinyl groups to ethyl bra
Alexeev081 [22]

Answer:

The average number is given as 48.6

Explanation:

From the question we see that the

                    Percentage of cis = 47.2%

                    Percentage of trans = 44.9%

                    Percentage of  vinyl = 7.9%

The chemical  reaction equation for the hydrogenation of polybutadiene is shown on the first uploaded image

    To obtain the average number of  backbone carbon between the ethyl side chains ,we divide the total number of carbon on the backbone by the total number of ethyl group

              That is

                             = (44.9% × 4 + 47.2% ×4 + 7.9% × 2) ÷(7.9% × 1)

                             = (384.2%/7.7%)

                              = 48.6

Note :  The percentage will cancel out

7 0
3 years ago
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