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sertanlavr [38]
2 years ago
14

Though a needle is several times as dense as water, a small needle can be made to float on the surface of water if placed carefu

lly.
a) What could be the reason?
b) Why does a water drop assume spherical shape?
Plastics played an important role in forest conservation. Substantiate the statement.
Chemistry
2 answers:
Alinara [238K]2 years ago
5 0
I believe your answer is B
viva [34]2 years ago
3 0
The water is more dense than the needle so it can withstand the weight. It is the contraction of the water falling faster than the others forming a drop pattern or the water getting smaller so the top looked smaller.
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An atom containing 25 protons, 30 neutrons and 25 electrons will have an atomic mass of:
aliya0001 [1]
Atomic mass=no of neutron+no of electron
Atomic mass=25+30
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A __________ ALSO IS MADE UP OF TWO OR MORE ATOMS. BUT IN THIS CASE IT CAN BE THE SAME AS WELL AS DIFFERENT
alina1380 [7]

Answer:

D

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Heavy nuclides with too few neutrons to be in the band of stability are most likely to decay by what mode?
Margarita [4]

Answer:

Positron emission

Explanation:

Positron emission involves the conversion of a proton to a neutron. This process increases the mass number of the daughter nucleus by 1 while its atomic number remains the same. The new neutron increases the number of neutrons present in the daughter nucleus hence the process increases the N/P ratio.

A positron is usually ejected in the process together with an anti-neutrino to balance the spins.

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In which case would an electron experience the greatest effective nuclear charge? not all cases describe an atom in the ground s
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One electron in an atom experiences the entire positive charge of the nucleus. Coulomb's law can be used in this situation to determine the effective nuclear charge.

In contrast, the outside electrons in an atom with many electrons are drawn to the positive nucleus and repelled by the negatively charged electrons at the same time. The force between two stationary, electrically charged particles can be measured using Coulomb's law inverse-square law, also known as Coulomb's law. Conventionally, the electric force between two charged objects at rest is referred to as the Coulomb force or electrostatic force.

The electron is a subatomic particle with the symbol e or with an electric charge of one elementarily negative charge. The lepton particle family's first generation includes electrons.

Learn more about Coulomb's law here

brainly.com/question/506926

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5 0
1 year ago
Pls help, needed for chemistry
vovangra [49]

Answer:

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