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3 years ago

I just need a full answer here not only so I can answer the question, but also so that I can learn.

1 answer:

7 0

Answer: Number of valence electrons determine how fast or easy for an atom to gain stability. Either by gaining electrons or by losing electrons.

Group one and seven elements react fast because they only have one electron to gain or lose.

Explanation:

Number of valence electrons tell us the number of electrons an atom will gain or lose in order to attain stability in electron configuration.

All the elements in a particular group will have the same number of valence electrons as follows:

Group one - 1 valence electron

Group two - 2 valence electrons

Group three - 3 valence electrons

Group four - 4 valence electrons

Group five - 3 valence electrons

Group six - 2 valence electrons

Group seven - 1 valence electron

Group eight - 0 valence electron

Some elements are more reactive than the others because of the electron affinity, oxidation state and electronegativity of the atoms

For instance, elements in group 7 are more reactive than others because of their oxidation state and they have very high electronegativity.

Also, group one elements are more reactive because they only have one electron to loose.

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A 0.144kg baseball is pitched horizontally at 38.0 m/s. After the baseball is hit by the bat, it moves at the same speed, but in

Hoochie [10]

Answer:

Given:

mass of the ball m = 0.144 kg

velocity v = 38 m/s

now, change in momentum

P = m v- ( - mv)

= 2 mv

=2 x (0.144) x (38)

= 10.944 kg-m/s

Impulse J= F. Δt

change in momentum is equal to impulse

J = 10.944 kg-m/s

we know force is equal to change in momentum per unit time

$F = \dfrac{P}{t}$

$F = \dfrac{10.944}{0.8\times 10^{-3}}$

F = 13.68 x 10³ N

F = 13.68 kN

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4 years ago

An object at rest is suddenly broken apart into fragments a and b by an explosion. the fragment a acquires three times the kinet

lbvjy [14]

Momentum will be conserved in one dimension in the explosion.

Given that the fragment a acquires three times the kinetic energy of the fragment b.

Pinitial = pfinal ⇒ 0 =mₐv⁰ₐ+mьv⁰ь= 0 ⇒ v⁰ь = -mₐv⁰ₐ/mь

KE= 3KEь

⇒1/2 mₐv⁰ₐ² = 3 (1/2mьv⁰ь²)

⇒1/2 mₐv⁰ₐ² = 3/2 mь(-mₐv⁰ₐ/mь)²

⇒1/2 mₐv⁰ₐ² = 3/2 mь(mₐ²v⁰ₐ²/mь²)

⇒1/2 x 2/3 = mₐ/mь= 1/3

Thus the ratio of the masses of the fragments is 1:3.

4 0

4 years ago

At a constant temperature, the volume of a gas doubles when the pressure is reduced to half of its original value. This is a sta

djyliett [7]

Answer: Boyle’s law

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$ (At constant temperature and number of moles)

As pressure is decreased to half, the volume is increased to doubled.

Charles' Law: This law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.

$V\propto T$ (At constant pressure and number of moles)

Gay-Lussac's Law: This law states that pressure is directly proportional to the temperature of the gas at constant volume and number of moles.

$P\propto T$ (At constant volume and number of moles)

Combined gas Law: combining the three laws:

$PV\propto T$

6 0

4 years ago

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Explain How is the frequency of a wave measured *

Ray Of Light [21]

Answer:

frequency of a wave can be measured by the number of crests in a second or more

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3 years ago

Need help!!

aniked [119]

Without air resistance, the ball would reach a height of h = 31.9 m(pic 1)
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The work done by air resistance must be equal to the energy difference(pic4)
The magnitude of the air resistance: F = 0.883N

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3 years ago