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3 years ago

What description best describes both mirrors and lenses?

2 answers:

7 0

Mirrors reflect light and lenses refract light.
Mirrors form images by reflecting all light that is incident on their surface, which allows us to see the reflections of objects in mirrors. Lenses, on the other hand, bend light and allow it to pass through them. The bending of light is used to form enlarged images, and for many other purposes as well.

Ulleksa [173]3 years ago

3 0

<u>Answer:</u> The correct statement is mirrors reflect light and lenses refract light.

<u>Explanation:</u>

Mirrors are defined as the piece of glass which has a shiny coating on one side. This shiny coating helps in the reflection of light when light rays falls on it. Reflection of light is defined as the process of throwing back of light rays after touching the surface.

Lenses are defined as the piece of glass which does not have any shiny coating and when light rays pass through it, the light rays get refracted. Refraction of light is defined as the process of bending of light when a medium is changed.

Hence, the correct statement is mirrors reflect light and lenses refract light.

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15). A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the

Andreyy89

Answer:

B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms

4 0

3 years ago

A galvanic cell consists of a iron electrode in 1 M Fe(NO3)2 and a copper electrode in 1 M Cu(NO3)2. What is the equilibrium con

Vladimir79 [104]

Answer:

Keq = 5.33*10²⁶

Explanation:

Based on the standard reduction potential table:

E°(Fe2+/Fe) = -0.45 V

E°(Cu2+/Cu) = +0.34 V

Since the reduction potential of copper is greater than iron, the former acts as the cathode and the latter as anode.

The half reactions are:

Cathode (Reduction): $Cu^{2+} + 2e^{-}\rightarrow Cu$

Anode (Oxidation): $Fe\rightarrow Fe^{2+}+ 2e^{-}$

------------------------------------------------------------------------------------------

Overall reaction: $Cu^{2+}+Fe\rightarrow Fe^{2+}+Cu$

The Gibbs free energy change at 25 C is related to the standard emf (E°) of the cell as well as the equilibrium constant K as:

$\Delta G^{0} = -RTlnK_{eq}=-nFE_{cell}^{0}$

here:

$E_{cell}^{0}= E_{cathode}^{0}-E_{anode}^{0}=0.34-(-0.45)=0.79V$

R = 8.314 J/mol-K

T = 25 C = 25+273 = 298 K

n = number of electrons involved = 2

F = 96500 Coulomb/mol e-

$8.314J/mol.K*298K*lnKeq= 2mole\ e^{-}*96500C/mole\ e^{-}*0.79V$

Keq = 5.33*10²⁶

6 0

4 years ago

Silver iodide powder has been used as an antiseptic and as an agent to seed clouds for rain. Silver iodide is 45.9% silver by ma

Dahasolnce [82]

Answer:

22.95g

Explanation:

Given parameters:

Percentage by mass of silver in silver iodide = 45.9%

Mass of silver iodide given = 50g

Unknown:

Mass of silver in silver iodide = ?

Solution:

The formula of the compound is;

Silver iodide = AgI

Since the percentage by mass of silver in the compound is 45.9%;

Mass of silver = percentage by mass of silver x mass of AgI

Mass of silver = $\frac{45.9}{100}$ x 50 = 22.95g

6 0

3 years ago

Describe how the properties of elements in the same group differ to the properties of elements in the same period.

love history [14]

Answer:

All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.

All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.

7 0

2 years ago

Read 2 more answers

2 h2o ( g) 2 h2 (g) + o2 (g) kp = 7.8 × 10-16 at 930 k. give the value of kp for this reaction, if it is written as: 1/2o2 (g) +

trapecia [35]

When multiplying by a constant, raise Kp to the power of that constant.

When the reaction is reversed, it gives the inverse of Kp.

Kp^(-1/2) = (7.8 x 10^-16)^(-1/2) = 3.6 x 10^7

7 0

4 years ago