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3 years ago

The neck of a glass funnel is covered with wet filter paper why

Chemistry

2 answers:

Svetllana [295]3 years ago

7 0

Answer:

The neck of a glass funnel is covered with wet filter paper in sublimation process because it will slow down the rising of the warm gases and it will prevents them from escape.

Elenna [48]3 years ago

7 0

Answer:

The neck of a glass funnel is covered with wet filter paper in sublimation process because it will slow down the rising of the warm gases and it will prevents them from escape.

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What element forms an ion with an electronic configuration of [kr] and a –2 charge?

nekit [7.7K]

Must be Selenium (Se). It is two space away from Kr, which means that it needs two extra electron to be like a noble gas, Kr.

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2 years ago

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he population of the Earth is roughly eight billion people. If all free electrons contained in this extension cord are evenly sp

wolverine [178]

1) Drift velocity: $3.32\cdot 10^{-4}m/s$

2) $5.6\cdot 10^{13}$ electrons per person

Explanation:

For a current flowing through a conductor, the drift velocity of the electrons is given by the equation:

$v_d=\frac{I}{neA}$

where

I is the current

n is the concentration of free electrons

$e=1.6\cdot 10^{-19}C$ is the electron charge

A is the cross-sectional area of the wire

The cross-sectional area can be written as

$A=\pi r^2$

where r is the radius of the wire. So the equation becomes

$v_d=\frac{I}{ne\pi r^2}$

In this problem, we have:

I = 8.0 A is the current

$8.5\cdot 10^{28} m^{-3}$ is the concentration of free electrons

d = 1.5 mm is the diameter, so the radius is

r = 1.5/2 = 0.75 mm = $0.75\cdot 10^{-3}m$

Therefore, the drift velocity is:

$v_d=\frac{8.0}{(8.5\cdot 10^{28})(1.6\cdot 10^{-19})\pi(0.75\cdot 10^{-3})^2}=3.32\cdot 10^{-4}m/s$

The total length of the cord in this problem is

L = 3.00 m

While the cross-sectional area is

$A=\pi r^2=\pi (0.75\cdot 10^{-3})^2=1.77\cdot 10^{-6} m^2$

Therefore, the volume of the cord is

$V=AL$ (1)

The number of electrons per unit volume is $n$ , so the total number of electrons in this cord is

$N=nV=nAL=(8.5\cdot 10^{28})(1.77\cdot 10^{-6})(3.0)=4.5\cdot 10^{23}$

In total, the Earth population consists of 8 billion people, which is

$N'=8\cdot 10^9$

Therefore, the number of electrons that each person would get is:

$N_e = \frac{N}{N'}=\frac{4.5\cdot 10^{23}}{8\cdot 10^9}=5.6\cdot 10^{13}$

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3 years ago

What is the first step in this<br> experiment?

allsm [11]

Cutting the cardboard would be the first step

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3 years ago

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A 150-lb patient is prescribed acetaminophen at 7.34 mg/kg. If acetaminophen is available on hand as a 0.125 mg/ml syrup, how ma

valentinak56 [21]

Answer:

The nurse should administer 3995.2 millilitres of syrup.

Explanation:

The conversion factor of pound weight to kilogram is; <em>1 lb = 0.453592 kg</em>

The body weight of the patient in Kg = 150 * 0.453592 = 68.04 kg

A prescription of 7.34 mg/kg acetaminophen means that he should receive;

7.34 mg * 68.04 = 499.4 mg of acetaminophen

Amount in grams of acetaminophen per millilitre of syrup = 0.125 mg

Number of millilitres of syrup required = 499.4 mg / 0.125 mg/mL = 3995.2 mL

Therefore, the nurse should administer 3995.2 millilitres of syrup.

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2 years ago

The sun warms a plate that heats up the water in a pool.

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Solar thermal because the sun is heating it up

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3 years ago

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The neck of a glass funnel is covered with wet filter paper why​

The neck of a glass funnel is covered with wet filter paper why