Why is tin foil a good insulator

Answers

Answer 1

Answer: Tin foil is a heat insulator because it can reflect radiation. When tin foil, for instance, is wrapped around an object, air can be trapped. Trapped air is a good insulator against convection.

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The melting points of canola oil, corn oil, sunflower oil, and peanut oil are 10°C, –11°C, –17°C, and –2°C. If you cool a mixture of these oils to 5°C, which one can you separate easily?

Answers

Answer: the canola oil.

Explanation:

According to the melting points reported, at 5°C canola oil, whose melting point is 10°C, will freeze (become solid), while the other three, corn oil, sunflower oil, and peanut oil, having melting points several degrees below 5°C, will remain in liquid state.

Therefore, by decantation or filtration, which are processes that permit separate solids from liquids in a mixture, you can separate easily the solid canola oil from the other three liquid oils.

After separating the canola oil, If you continue cooling the mixture and reach a temperature of - 5°C. the peanut oil, whose melting point is -2°C, whill freeze and you will be able to separate it (again by decantation or filtration).

The same operation, cooling a third time until a temperature around 12°C, will permit you to separate the remaining two oils.

As you see, the knowledge of the physical properties of the substances is a useful tool to separate mixtures.

You can separate the canola oil because it turns back into a solid state while the others remain liquid.

26.0 g of a liquid that has a density of 1.44 g/mL needs to be measured out in a graduated cylinder. what volume should be used

Answers

Answer: The volume of liquid used will be 18.055 mL.

Explanation:

To calculate the volume of liquid, we use the equation for density which is:

$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$

We are given:

Mass of the liquid = 26 g

Density of the liquid = 1.44 g/mL

Volume of the liquid = ? mL

Putting values in above equation, we get:

$1.44g/mL=\frac{26g}{\text{Volume of the liquid}}\n\n\text{Volume of the liquid}=18.055mL$

Hence, the volume of liquid used will be 18.055 mL.

As Density = Mass/Volume
Mass = 26.0g
Density = 1.44g/mL
Therefore Volume = Mass/Density
=> Volume = 26.0/1.44 = 18.055... = 18.1mL (to 3 sig figs)

Doesn't hydrogen have one energy level assuming that we only have one electron and not an ion?

Answers

It may have one occupied energy level at a time since it only has one electron, but overall it has several energy levels.

Yes, Hydrogen has one energy level, (an S sub-level that can fill up to two electrons).

The only other confusing thing about Hydrogen I can think of, is that you will almost never find it existing as a single Hydrogen, but as H2....

Clay and organic matter generally have higher capacity for retaining nutrients than silt and sand.True o false??

Answers

The answer is false because clay have more silt and sand

The answer is True.

water is mixed with solid calcium nitrate in a beaker. write balanced net ionic equation for the reaction

Answers

When calcium nitrate is added or mixed with water, the substance would dissociate into its corresponding ions which are calcium and nitrate ions. The ionic equation would be:

Ca(NO3)2 = Ca2+ + NO3-

Hope this answers the question. Have a nice day. Feel free to ask more questions.

Answer : The net ionic equation will be,

$Ca^(2+)(aq)+2OH^(-)(aq)\rightarrow Ca(OH)_2(s)$

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The balanced ionic equation will be,

$2H_2O(aq)+Ca(NO_3)_2(aq)\rightarrow 2HNO_3(aq)+Ca(OH)_2(s)$

The ionic equation in separated aqueous solution will be,

$4H^+(aq)+2OH^(-)(aq)+Ca^(2+)(aq)+2NO_3^(-)(aq)\rightarrow Ca(OH)_2(s)+2H^+(aq)+2NO_3^(-)(aq)$

In this equation, $H^+\text{ and }NO_3^-$ are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

$Ca^(2+)(aq)+2OH^(-)(aq)\rightarrow Ca(OH)_2(s)$

An atom of argon rarely bonds to an atom of another element because an argon atom has(1) 8 valence electrons
(2) 2 electrons in the first shell
(3) 3 electron shells
(4) 22 neutrons

Answers

The answer is (1) 8 valence electrons. Argon, being a noble gas, already possesses a full octet of valence electrons and is, therefore, very, very stable. It has an almost indomitable tendency to retain that octet. That is why it so rarely participates in any sort of bonding.

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