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schepotkina [342]
3 years ago
12

Help help Help Help what is the importance of a vacuum layer

Chemistry
2 answers:
natita [175]3 years ago
7 0

Answer:

A vacuum flask is usually used to insulate it's contents… I've used them for a multitude of things ranging from keeping my coffee warm, to keeping liquid nitrogen from evaporating.

The reason these types of flasks are so efficient has to do with their thermodynamic properties. To understand how a vacuum flask works, we need to know the basic properties of a vacuum. Air just like any other molecule is a conductor of heat.

Firstly, a “layer of vacuum” is created around the thermos, it's crucial that the chamber is depressurized*.

sertanlavr [38]3 years ago
6 0

Answer:

It prevents heat transfer by radiation, and the vacuum between double wall prevents heat moving by convection.

Explanation:

You might be interested in
A galvanic cell consists of a Cu(s)|Cu2+(aq) half-cell and a Cd(s)|Cd2+(aq) half-cell connected by a salt bridge. Oxidation occu
Kryger [21]

Answer:

Cd(s)|Cd^{2+}(aq) || Cu^{2+}(aq)|Cu(s)

Explanation:

A galvanic cell is composed of two electrodes immersed in a suitable electrolyte and connected via a salt bridge. One of the electrodes serves as a cathode where reduction or gain of electrons takes place. The other half cell functions as an anode where oxidation or loss of electrons occurs.

The representation is given by writing the anode on left hand side followed by its ion with its molar concentration. It is followed by a salt bridge. Then the cathodic ion with its molar concentration is written and then the cathode.

As it is given that cadmium acts as anode, it must be on the left hand side and copper must be on right hand side.

Cd(s)|Cd^{2+}(aq) || Cu^{2+}(aq)|Cu(s)

6 0
3 years ago
If the density of a liquid 102g/cm^3, how many milligrams will be in 63 mL of that liquid?
Ede4ka [16]

Answer:

<h2>6426000 mg</h2>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

63 mL = 63 cm³

We have

mass = 102 × 63 = 6426

But 1 g = 1000 mg

6426 g = 6426000 mg

We have the final answer as

<h3>6,426,000 mg</h3>

Hope this helps you

6 0
3 years ago
How many bonded pairs of electrons are there in the molecule NOCl?<br> A)2<br> B)3<br> C)4<br> D)5
iren2701 [21]
There are 2 covalent bonds between the Nitrogen and Oxygen, and 1 between the Nitrogen and Chlorine. 

It should be 3.
3 0
3 years ago
What are the two ways to measure the sand in a sand castle?
Sergeu [11.5K]
The two ways to measure the sand in a sand castle are by counting the number of pails of sand used to build the castle and by determining the mass of the sand used in building the castle. The first method makes use of the volume of the pail to determine the amount of sand while the second method is a more quantitative way.<span />
7 0
3 years ago
What is the volume, in milliliters, occupied by 30.07 g of an object of density equal to
den301095 [7]

Answer:

\boxed {\tt 20.317567567568 \ mL}

Explanation:

The density formula is:

d=\frac{m}{v}

Let's rearrange the formula for v. the volume. Multiply both sides by v, then divide by d.

d*v=\frac{m}{v}*v

d*v=m

\frac{d*v}{d}=\frac{m}{d}

v=\frac{m}{d}

The volume can be found by dividing the mass by the density. The mass of the object is 30.07 grams and the density is 1.48 grams per milliliter.

m= 30.07 \ g\\d= 1.48 \ g/mL

v=\frac{30.07 \ g}{1.48 \ g/mL}

Divide. Note, when dividing, the grams, or g will cancel out.

v= \frac{30.07}{1.48 \ mL}

v=20.317567567568 \ mL

The volume of the object is 20.317567567568 milliliters.

3 0
3 years ago
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