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3 years ago

15

What are differences and similarities between water and atoms?Explain

1 answer:

REY [17]3 years ago

8 0

Answer:

Atom may be defined as the smallest particle of an element which does not exist free in nature but takes part directly in chemical combinations.

Atom of any element is represented by the symbol of that element. For example, hydrogen atom is represented by H, sodium atom is represented by Na, etc.

Molecule may be defined as the smallest particle of an element or compound which exists free in nature but does not participate directly in chemical combinations.

Molecule of any substance is represented by their molecular formula. For example, water molecule is represented by H2O. It tells that each water molecule contains two atoms of hydrogen and one atom of oxygen.

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Describe why estimating the age of the Sun can give an approximate age of the Earth.

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Because the earth wouldn't be able to exist without the help of the sun, the sun is essential for earth.

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Which of the following elements does not form an ion with a charge of plus one hydrogen fluorine sodium or potassium

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The work function of an element is the energy required to remove an electron from the surface of the solid element. The work fun

Anton [14]

Explanation:

The given data is as follows.

Energy needed for 1 mole = 279.7 kJ = $279.7 \times \frac{1000 J}{1 kJ}$

= 279700 J

Therefore, energy required for 1 atom will be calculated as follows.

$\frac{279700}{6.022 \times 10^{22}}$

= $4.645 \times 10^{-19} J$

As relation between energy and wavelength is as follows.

E = $\frac{hc}{\lambda}$

where, h = planck constant = $6.62 \times 10^{-34} Js$

c = speed of light = $3 \times 10^{8} m/s$

$\lambda$ = wavelength

Therefore, putting given values into the above formula as follows.

E = $\frac{hc}{\lambda}$

$4.645 \times 10^{-19} J$ = $\frac{6.62 \times 10^{-34} Js \times 3 \times 10^{8} m/s}{\lambda}$

$\lambda$ = $4.28 \times 10^{-7} m$

or, = $428 \times 10{-9}$ m

= 428 nm

Thus, we can conclude that the maximum wavelength of light that can remove an electron from an atom on the surface of lithium metal is 428 nm.

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Match each object to its description:

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Answer:

There are 80 protons and 80 electrons in Hg+ (Mercury)

Explanation:

Name Mercury

Symbol Hg

Atomic Number 80

Atomic Mass 200.59 atomic mass units

Number of Protons 80

Number of Neutrons 121

Number of Electrons 80

Melting Point -38.87° C

Boiling Point 356.58° C

Density 13.456 grams per cubic centimeter

Normal Phase Liquid

Family Transitions Metals

Period Number 6

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