Answer:
I will pick fusion over fission.
Explanation:
Fission and Fusion are nuclear processes in which atoms are altered to create energy.
By definition, fission is simply the division of one atom into two atoms while fusion is simply the combination of two lighter atoms to produce a bigger atom.
I will pick fusion over fission for the following reasons;
- Fusion reactions produces far greater amounts of energy than fission reactions normally produce.
- Fusion does not produce radioactive, toxic waste products that can damage the environment we live whereas fission does so.
The flames being emitted by the ions are as a result of ions 3. emitting energy as they return to lower energy levels.
When ions are heated:
As they move around, they expend some of that energy and lose it as a result thereby returning to lower energy levels. As that energy is lost, it comes across as light being emitted by the ions.
In conclusion, ions in the flame test emit light as they lose energy and return to a lower energy level.
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Answer;
-Emit energy as they return to lower energy levels.
Explanation;
-A characteristic color of light is emitted by these ions in the flame when the electrons emit energy as they return to lower energy levels.
-The metal ions do absorb energy, and the electrons are boosted to higher energy levels, but they emit that energy as they fall to lower levels, and it is the photons of light they are emitting that can be seen.
Magnetizing steel is a physical change, not a chemical change because it does not change the chemical composition of the steel.
A chemical change is a change in which new substances are formed. This is because the atoms in the original substances are rearranged to form new atoms or molecules. There is no chemical change when magnetizing steel. For example, when iron rusts, it reacts with oxygen to form a new substance called iron oxide.
A physical change is a change in which the form of a substance is changed, but the substanceitself is not changed. For example, when you melt ice, you are changing the form of water from a solid to a liquid, but the water itself is not changed.
When you magnetize steel, you are simply aligning the magnetic domains in the steel. Magnetic domains are regions of a material that have a net magnetic field. When the magnetic domains are aligned, the steel becomes magnetized.
Magnetizing steel does not change the chemical composition of the steel. The steel is still made up of the same atoms, and the atoms are still arranged in the same way. The only difference is that the magnetic domains are aligned, which gives the steel its magnetic properties.
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B) The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.
C) The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.
D) The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.
Answer: The correct answer is Option A.
Explanation:
Chemical reactivity is defined as the tendency of an atom to loose or gain electrons.
Metals are the elements that looses electrons and thus, their chemical reactivity will be the tendency to loose electrons.
Their chemical reactivity decreases as we move from left to right in a period. This is so because, the electron get added up in the same shell. So, the electron in the outermost orbital gets more tightly bonded to nucleus. And hence, loosing an electron will require high energy. Thus, the chemical reactivity decreases.
These metals will loose 1 electron to form +1 ions.
These metals will loose 2 electrons to form +2 ions.
Hence, the correct answer is Option A.
b. because the warmer air allows the particles to be free from gravitational forces
c. because the heat liberates the potential energy inside each molecule eliminate
d. because the warmer air is less dense and particles can move more
Answer: Option (a) is the correct answer.
Explanation:
When temperature of surrounding atmosphere around the tire increases then it will lead to increase in the kinetic energy of molecules.
Due to increase in kinetic energy of molecules there will be more number of collisions between the air molecules that are present inside the bicycle tire.
Hence, it means heat has been transferred from the surrounding atmosphere to the molecules inside the tire.
Thus, we can conclude that the air molecules inside a bicycle tire speed up as the temperature gets warmer because the heat is transferred to the molecules and gives them more kinetic energy.
Following the ideal gas law PV = nRT, and changing it in terms of temperature, we get T = PV/nR. When volume of a sample of an ideal gas to double when the pressure of the sample remains the same, the temperature doubles because temperature is directly proportional with pressure and volume.