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Nadusha1986 [10]

3 years ago

14

Match the vitamin with its function.

1 answer:

Vera_Pavlovna [14]3 years ago

5 0

Answer:

Vitamin A: night vision Vitamin B: nervous system Vitamin C: resists infection Vitamin D: builds bones Vitamin E: healthy cells

I hope this helped!! Your fellow Brainly user, GalaxyGamingKitty

You might be interested in

Water and salt are compounds made of the combination of more than one type of atom. Which statement is false?

Whitepunk [10]

D
explanation
slattttt

7 0

3 years ago

Nicotine (C10H14N2), a plant alkaloid, is an oily liquid that makes up between 0.6 to 3% of a cigarettes mass. Contact with the

Pepsi [2]

There are 1.66 $\times$ 1 $0^{22}$ molecules in 1 gram of nicotine.

<u>Explanation</u>:

Nicotine is an organic compound with the chemical formula of $C_{10} H_{14} N_{2}$

Given the mass of nicotine = 4.50 g

Molecular mass of Nicotine = 162.23 g/mol

Moles of a compound = given mass / molar mass of the compound

= $\frac{4.50}{162.23} = 0.0277$

The Number of molecules of compound:

Moles $\times$ Avogadro number = 0.0277 $\times$ 6.023 $\times$ 1 $0^{23}$

= 1.66 $\times$ 1 $0^{22}$ molecules.

There are 1.66 $\times$ 1 $0^{22}$ molecules in 1 gram of nicotine.

4 0

3 years ago

Which statements regarding the Henderson-Hasselbalch equation are true? If the pH of the solution is known as is the pKa for the

Sonbull [250]

Answer:

1, 2, and 3 are true.

Explanation:

The Henderson-Hasselbalch equation is:

pH = pka + log₁₀ $\frac{[A^-]}{[HA]}$

If the pH of the solution is known as is the pKa for the acid, the ratio of conjugate base to acid can be determined. <em>TRUE</em>

pH = pka + log₁₀ $\frac{[A^-]}{[HA]}$

If you know pH and pka:

10^(pH-pka) = $\frac{[A^-]}{[HA]}$

The ratio will be: 10^(pH-pka)

At pH = pKa for an acid, [conjugate base] = [acid] in solution. <em>TRUE</em>

pH = pka + log₁₀ $\frac{[A^-]}{[HA]}$

0 = log₁₀ $\frac{[A^-]}{[HA]}$

10^0 = $\frac{[A^-]}{[HA]}$

1 = $\frac{[A^-]}{[HA]}$

As ratio is 1, [conjugate base] = [acid] in solution.

At pH >> pKa for an acid, the acid will be mostly ionized. <em>TRUE</em>

pH = pka + log₁₀ $\frac{[A^-]}{[HA]}$

If pH >> pKa, 10^(pH-pka) will be >> 1, that means that you have more [A⁻] than [HA]

At pH << pKa for an acid, the acid will be mostly ionized. <em>FALSE</em>

pH = pka + log₁₀ $\frac{[A^-]}{[HA]}$

If pH << pKa, 10^(pH-pka) will be << 1, that means that you have more [HA] than [A⁻]

I hope it helps!

6 0

3 years ago

Question 1. Considering the reaction of the decomposition of N2O5 to form the products NO2 and O2, calculate the average reactio

GalinKa [24]

<span>
</span><span> average reaction rate </span><span>= change in concentration / change in time
by putting values we have

= (1.00M - 0.987M) / (4.00s - 0.00s)
= 3.25x10^-3 mol/Lsec
this is our conclusion
hope this helps</span>

7 0

4 years ago

Read 2 more answers

A hydrogen atom absorbs a photon radiation causing an electron to jump from level one to level two. If the photon/radiation has

Crank

Answer:

1.

First of all, let's convert the energy of the absorbed photon into Joules:

The energy of the photon can be rewritten as:

where

h is the Planck constant

c is the speed of light

is the wavelength of the photon

Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:

2. 1.24 eV

In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength

So the energy of the emitted photon is given by the formula used previously:

and using

we find

converting into electronvolts,

Explanation:

3 0

3 years ago