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laila [671]
3 years ago
15

Can someone answer these few questions please?

Chemistry
1 answer:
Simora [160]3 years ago
5 0

Answer:

2.10x10⁻⁹ moles of Si, 143.7 moles of CCl₄, 3.49x10²⁴ atoms

Explanation:

These is the relation:

NA (6.02x10²³) ⇒ 1 mol of particles (it can be, atoms or molecules)

This are the rule of three:

NA of atoms occupies 1 mol of Si

1.27x10¹⁵ atoms will occupy (1.27x10¹⁵  .1 ) / NA = 2.10x10⁻⁹ moles of Si

NA of molecules are contained in 1 mol of CCl₄

8.65x10²⁵ molecules are contained in (8.65x10²⁵  .1)/ NA = 143.7 moles

1 mol of Ca has NA atoms

5.80 moles of Ca will have (5.80 . NA) = 3.49x10²⁴

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.In a _____ relationship one variable increases and a second variable increases proportionally,
liraira [26]

Answer:

Explanation: b

8 0
3 years ago
When two atoms with different electronegativities are bonded together, a bond dipole exists. These are displayed with an arrow o
____ [38]

Answer:

Dipole, less electronegativity,  higher electronegativity

Explanation:

!!! Incomplete Question

When two atoms with different electronegativities are bonded together, a bond dipole exists.

A bond dipole is a partial charge assigned to bonded atoms due to difference in electron density, difference in electronegativity is a factor to this.

These are displayed with an arrow originating at the atom with the less electronegativity and pointing toward the atom with the higher electronegativity value

6 0
3 years ago
Metals lose electrons under certain conditions to attain a noble gas electron configuration. How many electrons must be lost by
viva [34]

Answer:

2 electrons

E. neon

Explanation:

Metals lose electrons under certain conditions to attain a noble gas electron configuration. Magnesium has 12 electrons and its electron configuration is

1s² 2s² 2p6⁶ 3s²

When magnesium loses 2 electrons, it acquires the electron configuration of neon (10 electrons).

5 0
3 years ago
a bright violet line occurs at 435.8 nm in the emission spectrum of mercury vapor. What amount of energy, in joules, must be rel
Readme [11.4K]
<h3>Answer:</h3>

4.56 × 10^-19 Joules

<h3>Explanation:</h3>

We are given;

  • Wavelength of the wave as 435.8 nm

We are required to calculate the amount of energy released by an electron.

  • We know that the speed of the wave, c is 2.998 × 10^8 m/s
  • But, c = f × λ , where f is the frequency and λ is the wavelength
  • Energy of a wave is given by the formula;

E = hf , where h is the plank's constant, 6.626 × 10^-34 J-s

But, f = c/λ

Therefore;

f = (2.998 × 10^8 m/s) ÷ (4.358 × 10^-7 m)

  = 6.879 × 10^14 Hz

Thus;

Energy = 6.626 × 10^-34 J-s ×6.879 × 10^14 Hz

            = 4.558 × 10^-19 Joules

            =  4.56 × 10^-19 Joules

Therefore, the energy that must be released by the electron is 4.56 × 10^-19 Joules

7 0
3 years ago
Someone please help me answer this.
pantera1 [17]
Cloudy skies and precipitation. Rain is normally caused by water vapor within the condensation of the low pressure system.
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