can someone plz help me with this..

Answer:

Explanation:

N - type semi conductor

rgrgtff

ghhbbbhhghghgghgggferer

Answer:

Weight is the measure of the force of gravity on an object. The mass of an object will never change, but the weight of an item can change based on its location. For example, you may weigh 100 pounds on Earth, but in outer space you would be weightless.

Explanation:

I can't see the options but I hope this helps!

Answer:

the answer is B.

I hope this helps!

Explanation:

Answer:

2875 s

Explanation:

From the question given above, the following data were obtained:

Power (P) = 80 J/s

Energy (E) = 2.3×10⁵ J

Time (t) = ?

Power can simply be defined as the rate at which energy is used. Mathematically, power is expressed as:

Power = Energy / time

P = E/t

With the above formula, we can obtain the time taken for the bulb to consume 2.3×10⁵ J. This can be obtained as follow:

Power (P) = 80 J/s

Energy (E) = 2.3×10⁵ J

Time (t) = ?

Power = Energy / time

P = E/t

80 = 2.3×10⁵ /t

Cross multiply

80 × t = 2.3×10⁵

Divide both side by 80

t = 2.3×10⁵ / 80

t = 2875 s

Therefore, it will take 2875 s for the bulb to consume 2.3×10⁵ J of energy.

Answer:

No

Why?

Explanation:

A pure sample of an unknown molecule has a mass of 0.03551 kg and contains 0.2000 moles.

What is the molecular weight of the substance?

Answer:

177.6 g/mol

Explanation:

Trust me

Answer: D an organism

Explanation:

Answer:

Strontium is the second element placed in the 5th period

Hope this will help you if not so advance sorry :)

The standard reduction potential for the given question is-1.68 V, under the condition that the given half-reaction is  Al(aq) +3e→ Al(s), then the required answer to the given question is Option B.

The standard reduction potential refers to the potential difference comparing the standard hydrogen electrode (SHE) and the half-reaction. The (SHE) possess a standard reduction potential of 0 V at all temperatures.

Hence, the standard reduction potential for the half-reaction Al(aq) + 3e→ Al(s) can be evaluated as follows

E°(Al₃⁺(aq) + 3e⁻ → Al(s)) - E°(H⁺(aq) + e⁻ → 1/2H₂(g))

= -1.66 V - 0 V

= -1.66 V

≈ -1.68 V

A half-reaction can occur for either the oxidation or reduction reaction component of a redox reaction. It projects the change in oxidation states of the substances involved. Half-reactions are applied to describe the processes in an electrochemical cell, in which one metal is oxidized at the anode and another metal is reduced at the cathode.

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Answer:

B

Explanation:

-1.68 V

Explanation:

sodium element with 11 electrons,11protons and 12 neutrons

Answer: white?

Explanation:

When all the colors of the spectrum are combined and strike the human eye at the same time, the human eye will see white color. Therefore, option (D) is correct.

The electromagnetic spectrum can be described as the range of frequencies of electromagnetic radiation and its wavelengths and photon energies. The electromagnetic spectrum have range from below one hertz to above 10²⁵ hertz.

Electromagnetic radiation with a wavelength between 380 to 760 nm is detected by the human eye and recognized as visible light. Other wavelengths, especially near-infrared and ultraviolet are also sometimes referred to as light.

White light can be defined as a combination of lights of different wavelengths in the visible region of the spectrum. When white light is passed through a prism splits it up into the several colors of light observed in the visible spectrum.

Therefore,  all the colors of the spectrum are combined, and the human eye will see white color.

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The equations that show a precipitation reaction would be [tex]MgSO_4(aq) + CaCl_2(aq) --- > MgCl_2(aq) + CaSO_4(s)[/tex], [tex]FeCl_2(aq) + Na_2CO_3(aq) --- > FeCO_3(s) + 2NaCl(aq)[/tex], and [tex]2AgNO_3(aq) + Na_2S(aq) --- > Ag_2S(s) + 2NaNO_3(aq)[/tex]

It is a reaction in which two soluble salts react in aqueous solutions to form one soluble and one insoluble salt.

Thus, all the equations with an insoluble salt as one of the products will qualify as precipitation reactions. The insoluble is designated as (s).

Hence, the following are precipitation reactions:

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i think that the more diverse an ecosystem is the more sustainable it will be. do you have a picture of your problem?

Answer:

Two vectors are equal if they have the same magnitude and the same direction. Just like scalars which can have positive or negative values, vectors can also be positive or negative. A negative vector is a vector which points in the direction opposite to the reference positive direction.

Answer:b

Explanation:

Right

Answer: The correct name for the compound [tex]C_2I_3[/tex]  is, Dicarbon triiodide.

Explanation:

[tex]C_2I_3[/tex] is a covalent compound because in this compound the sharing of electrons takes place between carbon and iodine.. Both the elements are non-metals. Hence, it will form covalent bond.

The naming of covalent compound is given by:

The less electronegative element is written first.

The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.

If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.

Hence, the correct name for the compound [tex]C_2I_3[/tex]  is, Dicarbon triiodide..

Answer:

Answer:

the l sign means the substance in the chemical equation is a liquid. (hope this helped : D )

Answer: The specific heat of the liquid is [tex]2520J/kg^0C[/tex]

Explanation:

[tex]heat_{absorbed}=heat_{released}[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

        .................(1)

where,

q = heat absorbed or released

= mass of glass = x kg

= mass of liquid = x kg

= final temperature =

[tex]T_1[/tex] = temperature of glass = [tex]83^oC[/tex]

[tex]T_2[/tex] = temperature of liquid = [tex]43^oC[/tex]

[tex]c_1[/tex] = specific heat of glass = [tex]840J/kg^0C[/tex]

[tex]c_2[/tex] = specific heat of liquid= ?

Now put all the given values in equation (1), we get

[tex]-[(x\times 840\times (53-83)]=x\times c_2\times (53-43)[/tex]

[tex]c_2=2520J/kg^0C[/tex]

Therefore, the specific heat of the liquid is [tex]2520J/kg^0C[/tex]

An acid and a base which differ from each other by a proton are said to form a conjugate pair. The conjugate base of HSO₃⁻ is SO₃²⁻. The correct option is C.

The entity produced when an acid gives up a proton has a tendency to regain the proton and hence it behaves as a base. It is called the conjugate base of the parent acid.

The entity produced when a base accepts a proton has a tendency to donate the proton and hence behaves as an acid. It is called the conjugate acid of the parent base.

Sulfur dioxide dissolved in water gives sulfurous acid H₂SO₃. The conjugate base of this material contains one proton less i.e, HSO₃⁻ and the conjugate base of the substance bisulfite is SO₃²⁻which is sulfite ion.

Thus the correct option is C.

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Answer:

Not affected.

Explanation:

Kinetic energy of the dominoes not affected if the first domino did not hit the second one because no kinetic energy is lost due to no collision. If the first domino hit the second one, its kinetic energy decreases and changes in other form of energy such as heat and sound energy etc. But when there is no collision occur, then there is no change in the kinetic energy of dominoes.

Answer:

From top to bottom of the periodic table ions will increase in radii. However, now left to right the radius is more of a function of the number of electrons. ... Similarly, O2- will be larger than F- as both have 10 electrons but Z=8 for oxygen and Z=9 for fluorine.

The oxygen ion is bigger than the fluorine ion , the reason is explained below

What is an Atomic Structure ?

An atom is composed of electrons , protons and neutrons .

Electrons have negative charge and are grouped in different shells around the nucleus

Protons and neutrons are present in positively charged nucleus

The nucleus has the most mass .The atomic number is the number of protons which is equal to the number of electrons.

Both oxygen atom and fluorine atoms are isoelectronic , they have 10 electrons in the shell , but oxygen has 8 protons while fluorine have 9 protons in the nucleus.

It is believed that as the atomic number increases so the attraction forces of the nuclei increases , making the nucleus smaller and the overall atom smaller

while the oxygen atom on reduction forms oxide anion , which is a dianion and a fluorine atom forms fluoride ion which has a single negative charge and the ion which has more electrons have more electron electron repulsion and the size of the ion is bigger.

Hence the oxygen ion is bigger than the fluorine ion.

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Answer:

Check photo

Explanation:

Answer:

Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles

And the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.

Answer:

[tex]T=16K=-256.8\°C[/tex]

Explanation:

Hello!

In this case, according to the gas laws, we would be able to assume HCl can be modeled as an ideal gas for this calculation purpose; in such a way, we use the following equation to compute the temperature:

[tex]PV=nRT\\\\T=\frac{PV}{nR}[/tex]

In such a way, we plug in moles, volume and pressure to obtain:

[tex]T=\frac{2atm*2L}{3mol*0.08206\frac{atm*L}{mol*K}}\\\\T=16K=-256.8\°C[/tex]

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A longer wavelength means that it has a small frequency, so B.

In this case, red light has the longest wavelength on the spectrum. Anything past red will always have a smaller wavelength and it will always shrink until reaching violet.

Answer:

B

Explanation:

Higher frequencies have smaller wavelengths

Smaller frequencies have higher wavelengths

Explanation:

It looks like 2,2,4-trimethylpentane.

Longest alkane chain contains 5 carbons. => -pentane

3 methyl groups on the 2nd, 2nd and 4th carbons.