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Bess [88]
3 years ago
6

What simple test would you use to identify the possible presence of HCl (aq)? what result do you expect if the solution is HCl (

aq)?
Physics
2 answers:
vitfil [10]3 years ago
5 0
The simplest test to do in order to identify the possible presence of hydrochloric acid is to use a pH paper. Dipping it will change the color of the paper to a color that will signify that the pH is under the acid range (1-6). Hope this helps.
allsm [11]3 years ago
4 0

Answer and explanation;

The easiest way to test for hydrochloric acid is with silver nitrate solution.

-Add silver nitrate solution to the test solution in a test tube and observe the reaction. If a white precipitate forms, hydrochloric acid is present.

-Hydrochloric acid (HCI) is a strong corrosive acid that occurs by dissolving hydrogen chloride in water. It is often used as a chemical reagent and is also made naturally in the body. Most gastric acid (human digestive acid) is made of hydrochloric acid.

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One type of sunburn occurs on exposure to UV light with a wavelength in the vicinity of 325 nm. What is the energy of a mole of
andrew11 [14]

Answer: Energy of a mole of these photons is 0.368\times 10^6Joules  

Explanation:

The relationship between wavelength and energy of the wave for 1 mole follows the equation:

E=\frac{Nhc}{\lambda}

E= energy

N= avogadros number =6.023\times 10^{23}

\lambda = wavelength of the wave  =325\times 10^{-9}m    1nm=10^{-9}m

h = Planck's constant  = 6.626\times 10^{-34}Js

c = speed of light = 3\times 10^8m/s

E=\frac{6.023\times 10^{23}\times 6.626\times 10^{-34}\times 3\times 10^8m/s}{325\times 10^{-9}m}

E=0.368\times 10^6Joules  

Thus the energy of a mole of these photons is 0.368\times 10^6Joules  

3 0
3 years ago
4 kg of water was
morpeh [17]

Given :

Mass =5kg

T

1

=20

∘

C,T

2

=100

∘

C

ΔT=100−20=80

∘

C

Q=m×C×ΔT

where C= specific heat capacity of water

=4200J/(kgK)

Q=5×4200×80

=1680000 Joule.

=1680KJ

6 0
3 years ago
Your friend wants to be magician and intends to use Earth’s magnetic field to suspend a current-carrying wire above the stage. H
sesenic [268]

Answer:

I=1960A

Explanation:

Under this  condition, . In order to suspend the wire, this magnetic force would  have to be equal in magnitude to the gravitational force exerted by Earth on the  wire the maximum force at angle

F=ILxB

Now to the suspend the wire so use the maximum force and solve to the current knowing the magnetic field of the earth

∑Fy=0

F_{m}-F_{g}=0

I*L*\beta-m*g=0

Solve to I current

I=\frac{m*g}{L*\beta}

I=\frac{10x10^{-3}kg*9.8m/s^2}{1m*0.5x10{-4}T}

I=1960A

I suggest do an toher act is really risk that current for an act

7 0
3 years ago
When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains t
Doss [256]
Yes yes ! How right you are ! Truer words were never spoken.
7 0
3 years ago
La unidad de calor es la caloría; es posible expresarla en el sistema internacional de medidas??
d1i1m1o1n [39]

Answer:

Yes, the calorie can be expressed in SI units

Explanation:

1 calorie (1 cal) is defined as the amount of heat energy that must be supplied to 1 gram of water in order to raise its temperature by 1 degree Celsius (1^{\circ}C.

The calorie is not a unit of the International System (SI): the SI unit for the energy is the Joule (J).

However, it is possible to convert energy from calories to Joules, and viceversa. In fact, the conversion factor between the two units is:

1 calorie = 4.184 Joules

So, to convert from calories to Joules we simply multiply by 4.184, while if we want to convert from Joules to calories, we just divide by 4.184.

8 0
3 years ago
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