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Scilla [17]
3 years ago
7

How does skin defend the body against pathogens

Chemistry
2 answers:
bulgar [2K]3 years ago
6 0
Skin, tears and mucus are part of the first line of defence in fighting infection. They help to protect us against invading pathogens. You have beneficial bacteria growing on your skin, in your bowel and other places in the body (such as the mouth and the gut) that stop other harmful bacteria from taking over.
Morgarella [4.7K]3 years ago
4 0

Answer:

C. It blocks pathogens from getting inside the body.

Explanation:

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What is the number if moles of nitrogen gas which react with 18 g of magnesium to form magnesium nitride compound?(mg=24,N=14)
makvit [3.9K]

Answer:

It is true. a) 0.25 mol

Explanation:

<em>Hello </em><em>there?</em>

To begin solving this problem, you have to write down the chemical equation and make sure it is well balanced.

The chemical equation is;

3Mg(s) + N2(g) => Mg3N2(s)

1 mole of Mg = 24g

We have 18g of Magnesium (Mg) reacting with Nitrogen gas (N2)

From our equation,

Mole ratio = 3 : 1, (Mg : N2)

1 mol Mg = 24g

x mol Mg = 18g

x mol Mg = (18/24) = 0.75 mol Mg

But mole ratio = 3 : 1 (Mg : N2)

This means that 3 => 0.75 mol Mg

What about ratio 1 of N2?

N2 = (0.75 mol ÷ 3)/1

= 0.25 mol N2

<em>I </em><em>hope</em><em> </em><em>this </em><em>helps</em><em> </em><em>you </em><em>to </em><em>understand</em><em> </em><em>better</em><em>.</em><em> </em><em>Ha</em><em>v</em><em>e </em><em>a </em><em>nice </em><em>studies.</em><em> </em><em />

6 0
3 years ago
Pls help i have 2 hours to do this
Scilla [17]
3ZnCl2 + 2Al → 2AlCl3 + 3Zn
3 0
3 years ago
Julia did an experiment to study the solubility of two substances. She poured 100 mL of water at 20 °C into each of two beakers
Aleks [24]

<u>Answer:</u> The solubility of B is high than the solubility of A.

<u>Explanation:</u>

The solubility is defined as the amount of substance dissolved in a given amount of solvent. More the solute gets dissolved, high will be the solubility and less the solute dissolved, low will be the solubility.

For the given observations:

Mass of undissolved substance of substance A is more than Substance B at every temperature. This implies that less amount of solute gets dissolved in the given amount of solvent.

Hence, substance B has high solubility than substance A.

7 0
3 years ago
Read 2 more answers
An enzyme can catalyze a reaction with either of two substrates, S1 or S2. The Km for S1 was found to be 2.0 mM, and the Km, for
disa [49]

Answer:

101

Explanation:

Provided that

S_1 = S_2 = same\ V_{max}

And,

S_1\ k_M = 2.0mM\\S_2\ k_M = 20mM

Now we expect the same

{S} (0.1mM)

This determines that S_1 generates a  higher rate of product formation as compared to the S_2

So we can easily calculate the V_{max} for either of S_1 or S_2 as we know that Tube 1 is S_2 and tube 2 is S_1

As we know that

V_0 = V_{max}\ {S} / (K_M + {S})

As the rates do not include any kind of units so we do not consider the units for V_{max}

Now the calculation is

0.5 = V_{max} (0.1\ mM) / (20\ mM + 0.1\ mM)

V_{max} = 0.5 (20.1\ mM) / 0.1\ mM

= 100.5

≈ 101

3 0
3 years ago
Identify the acid, base, conjugate acid and conjugate base in the following reactions:
Leni [432]

Answer:

a. NH₃ : base

CH₃COOH (acetic acid) : acid

NH₄⁺ : conjugate acid

CH₃COO⁻ : conjugate base

b. HClO₄ (perchloric acid) : acid

NH₃ : base

ClO₄⁻ : conjugate base

NH₄⁺ : conjugate acid

Hope this helps.

4 0
3 years ago
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