5. force and speed
Nuclear fusion in stars causes the hydrogen atoms to collide with each other and form the heavier helium atom. The fusion reaction is therefore:
₁H² + ₁H² → ₂He⁴
Extreme heat in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The force and speed of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei.
All ancient fossils contain C-14
All living things contain more than one isotope of carbon, the most prominent being, carbon -12 and carbon-14.
Carbon-14 is a radioactive isotope of carbon. When the artifact is retrieved, the activity of carbon-14 in that sample is matched with the carbon-14 activity of a living organism. When this is done, the age of the fossil can easily be accurately calculated.
the correct answer is B) C2H4O2
I'm Pretty Sure the answer is C2O2H. If these are the answer choices.
I hope this is what you're talking about. My bad if I get this totally wrong.
I hope you won't be solid on this answer, But I researched it with my colleagues, and we all agreed it's the amount of atoms in the compound. (I hope this was you question.)
Balanced nuclear reaction equation for the beta minus decay of iodine-131 is .
Nuclear reaction is a reaction which changes the identity of an atomic nuclei, when high energetic particles is bombarded on that.
Beta minus decay is one of the example of nuclear reaction, and in this reaction a neutron decays into an electron which is also known as beta particle having no mass in it. And at the same time gamma rays also. In the question, it is given that iodine-131 shows beta minus decay, where the superscript of xenon is 131 and subscript of electron is -1. i.e.
We have to balance the above equation and for that sum of the superscripts and subscripts is always equal on both left and right sides.
Calculation for superscripts:
131 = 131 + y
y = 0.
Calculation for subscripts:
53 = x - 1
x = 53 + 1 = 54
Hence, balanced nuclear equation can be written as .
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Flame test is used to identify metallic ions present in a sample. Each metallic ion exerts different colors to the flame. Calcium ions imparts intense red color to the flame. Hence, further confirmation tests are to be done for calcium ions.
Flame test is a preliminary test used to identify the presence of cations in the sample by colors exerted to the flame. Metallic ions such as sodium, potassium, lithium, magnesium etc.
Electrons are excited to higher energy levels by absorbing energy and then returns to the ground level by emitting in a wavelength of complementary color. That's why see a color in the flame.
Flame test is conducted by making a paste of the sample with HCl and a glass rod dipped in this paste is shown to the flame. Calcium ions shows' brick red flame.
To confirm the presence of calcium, to one portion of the sample solution, oxalic acid is added, if calcium is present a white precipitate of calcium oxalate will be formed.
To learn more about flame test, refer the link below: