Chemistry, 28.07.2019 21:00 haley4023

Asphere is charged with electrons to −8 × 10−6 c. how many electrons make up this charge? the elemental charge is 1.6 × 10−19 c.

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Number of electrons = 5.6 x 10^13

Reason:
Charge on 1 electron = -1.6 × 10^−19 C
Total charge of sphere = -9 × 10^−6 C.

Thus, total number of electrons making up the charge,
= $\frac{\text{Total charge on sphere}}{\text{Charge on 1 electron}}$ = 9 × 10^−6 C / 1.6 × 10^−19 C= 5.6 x 10^13

Answer from: julieariscar769

5 x 10¹³ electrons

Explanation:

1) The charge of one electron is the fundamental charge (negative by convention): - 1.6 x 10⁻¹⁹ C (C means coulombs, which is the SI unit for charge).

2) Since you have the charge of the sphere, and know the carge on an electron, you just have to divide the charge of the sphere by the charge of one electron to determine how many electrons are in the given charge.

3) This is the calculations:

number of electrons = total charge / charge of one electron =

number of electrons = −8 × 10⁻⁶ C / ( - 1.6 × 10⁻¹⁹ C) = 5 x 10¹³

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

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Asphere is charged with electrons to −8 × 10−6 c. how many electrons make up this charge? the eleme...

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