CHEMISTRY HIGH SCHOOL

Light can be transmitted through long fiber optic strands because ofa. refraction.
b. external diffraction.
c. total internal reflection.
d. interference

Answers

Answer 1

Answer:

Answer:

Explanation:

Total internal reflection :

It is the complete reflection of light in the medium ( medium may be glass ,water etc ) from the surrounding surface.
Total internal reflection occur when angle of incidence is greater than the limiting angle ( limiting angle is also known as critical angle ).

Light can be transmitted through long fiber optic due to total internal reflection

So the option (c) is the correct option

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Which equation is a decomposition reaction?a. Li2CO3 ---> Li2O + CO2

b. Zn + HCl ---> ZnCl2 + H2

c. Na2O + CO2 ---> Na2CO3

d. C6H12O6 + O2 ---> CO2 + H2O

please help asap

Answers

Answer : (a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Explanation :

(a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

(b) $Zn+2HCl\rightarrow ZnCl_2+H_2$ is a displacement reaction.

Displacement reaction : It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

(c) $Na_2O+CO_2\rightarrow Na_2CO_3$ is a combination reaction.

Combination reaction : It is a type of reaction where two or more compounds combine to form a single compound.

(d) $C_6H_(12)O_6+6O_2\rightarrow 6CO_2+6H_2O$ is a combustion reaction.

Combustion reaction : It is a type of reaction where a hydrocarbon react with the oxygen to produced carbon dioxide and water.

Therefore, option (a) is a decomposition reaction.

The reaction in which reactant breaks down into more than one constituents is called decomposition reaction. So option A. Li2CO3 ---> Li2O + CO2 is correct.

What minimum volume of 0.200 m potassium iodide solution is required to completely precipitate all of the lead in 195.0 ml of a 0.194 m lead(ii) nitrate solution?

Answers

First, we write the reaction equation:

2KI + PbNO₃ → K₂NO₃ + PbI₂
The molar ratio of KI to PbNO₃ is 2 : 1
Moles of PbNO₃ present:
Moles = concentration (M) x volume (dm³)
= 0.194 x 0.195
= 0.038
Moles of KI required = 2 x 0.038 = 0.076 moles
concentration = moles / volume
volume = moles / concentration
= 0.076 / 0.2
= 0.38 L = 380 ml

If the current in a wire is directed upward, what is the direction of the magnetic field produced by the current?

Answers

Horizontal if I am correct

According to the big bang theory, approximately when did the universe begin?4 billion years ago
7 billion years ago
11 billion years ago
13 billion years ago

Answers

The correct answer is 13 billion years ago.

The Big Bang theory is the existing cosmological model for the apparent universe from the most primitive known periods via its consequent large scale evolution. The model illustrates that how the expansion of the universe took place from a very high temperature and high-density state and provides a complete illustration for a wide array of processes comprising the existence of cosmic microwave background, light elements, Hubble's law, and large scale structure.

The complete measurements of the rate of expansion of the universe put the Big Bang at approximately 13.8 billion years ago, that is, thus regarded as the age of the universe.

According to the big bang theory it would be around 13 billion years ago.

(a) how many milliliters of a stock solution of 6.0 m hno3 would you have to use to prepare 110 ml of 0.500 m hno3? (b) if you dilute 10.0 ml of the stock solution to a final volume of 0.250 l, what will be the concentration of the diluted solution?

Answers

a) in this we are diluting a stock solution, so we can use the dilution formula

c1v1 = c2v2

where c1 is concentration and v1 is volume of the stock solution

c2 is concentration and v2 is volume of the diluted solution to be prepared

substituting the values

6.0 M x V = 0.500 M x 110 mL

V = 9.17 mL

9.17 mL of the stock solution should be taken and diluted upto 110 mL to prepare the 0.500 M solution

In this question we are given the volume taken from the stock solution , we have to find the concentration of the diluted solution

again we use the dilution formula, c1v1 = c2v2

substituting the values

6.0 M x 10.0 mL = C x 250 mL

C = 0.24 M

the concentration of diluted solution is 0.24 M

Final answer:

To prepare 110 ml of 0.500 M HNO3 from a 6.0 M HNO3 solution, 9.17 ml of the stock solution would have to be used. If 10.0 ml of the stock solution is diluted to a final volume of 0.250 L, the concentration of the diluted solution will be 0.24 M.

Explanation:

(a) In order to prepare 110 ml of 0.500 M HNO3 from a 6.0 M HNO3 solution, we have to use the formula M1V1 = M2V2 where M and V are the molarity and volume respectively. Here, the M1 and V1 are the molarity and volume of the stock solution and M2 and V2 are the molarity and volume of the diluted solution. Filling in known values, 6.0M * V1 = 0.500M * 110ml. Solving for V1, we get V1 = (0.500 M * 110 ml) / 6.0 M = 9.17 ml. So, you would have to use 9.17 ml of the stock solution.

(b) The diluted solution's molarity is calculated using the same formula as before. Substituting the known values 6.0M * 10.0 ml = M2 * 0.250 L, rearrange the formula to get M2= (6.0M * 10.0 ml) / 0.250 L = 0.24 M or 240 mM. Therefore, the concentration of the diluted solution is 0.24 M.