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bonufazy [111]
3 years ago
14

How many controls or controlled variables can there be in an experiment

Chemistry
1 answer:
notsponge [240]3 years ago
3 0

i would say 35 i think

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Determine the distance of closest approach (in fm) before the alpha particle reverses direction. Assume the lead nucleus remains
kiruha [24]

Answer:

Take E(alpha particle energy) = 5.5 MeV (5.5x106x1.6x10-19)

If the charge on the lead nucleus is +82e(atomic number of lead is 82) = +82x1.6x10-19 C and the charge on the alpha particle is +2e = 2x1.6x10-19 C

Using dc = (1/4πεo)qQ/Eα we have

dc = [9x10^9x(2x1.6x10-19x82x1.6x10-19)]/5.5x10-13 = 6.67x10^-13m. = 6.67 x 10^-13 x 10^15 = 6.67 x 10^2fm

Note: 1meter = 10^15fentometer

Explanation:

This is well inside the atom but some eight nuclear diameters from the centre of the lead nucleus.

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3 years ago
The law of definite proportions helps us explain why water will always        A. break down into gas when heated.   B. be releas
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... liquid water are two different forms of the same chemical substance, water. A chemical substance is a form of matter that has constant chemical ...
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Within a period, the nuclear charge increases as you move from left to right across the
a_sh-v [17]

Answer:

The answer is Ionization energy.

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Ionization Energy. The ionization energy tends to increase as one moves from left to right across a given period or up a group in the periodic table.

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A proton is also known as this symbol, _____ ion.
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Hydrogen ion, strictly, the nucleus of a hydrogen atom separated from its accompanying electron. The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton. The isolated hydrogen ion, represented by the symbol H+, is therefore customarily used to represent a proton.
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One molecule of glucose makes 36 molecules of atp how many molecules of glucose are needed to make 1800 molecules of atp
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You would need exactly 50 molecules of glucose. 
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