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Natalka [10]
3 years ago
14

The lid on a jar is an example of which simple machine?

Chemistry
1 answer:
marysya [2.9K]3 years ago
8 0
Mechanical machine
poop on it
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What is the correct name for N2O
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Explanation:

Nitrous oxide

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A water environment<br> Producers<br> Decomposer <br> Consumer <br> Aquatic <br> Terrestrial
dmitriy555 [2]

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aquatic

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How does inertia affect a person who is not wearing a seatbelt during a collision?
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The side chain of histidine has a pKa of about 6. What percent of histidine side chains would be deprotonated at pH 7.5
Setler [38]

The percent of histidine side chains would be deprotonated at pH 7.5  is 5.77 %.

<h3>What is pKa?</h3>

The term pKa refers to the negative logarithm of the acid dissociation constant (Ka). The pH is the negative logarithm of the hydrogen ion concentration.

Hence;

Ka = Antilog (-6) =1 * 10^-6

[H^+] = Antilog (-7.5) = 3 * 10^-8 M

We now have to use the formula;

α = \sqrt{} \frac{Ka}{[H^+] }

α = \sqrt{} \frac{ 1 *10^-6}{3 *10^-8  }

α = 5.77 %

Hence, the percent of histidine side chains would be deprotonated at pH 7.5  is 5.77 %.

Learn more about percent dissociation: brainly.com/question/12273293

3 0
3 years ago
Sodium bicarbonate is sometimes used to neutralize acid spills. If 2.0 L of 1.0 M H2SO4 is spilled, what mass of sodium bicarbon
UkoKoshka [18]

Answer:

168.0 g

Explanation:

First thing, write a balanced chemical equation:

H_{2}SO_{4}+ 2NaHCO_{3}  ----> Na_{2}SO_{4} + 2H_{2}O+2CO_{2}

n(H2SO4) = concentration * volume

                = 1.0 M * 2.0 L

                = 2.0 mol

According to the balanced equation, 1 mol of acid requires 2 mol of sodium bicarbonate. This means that 2 mol of acid requires 2 mol of sodium bicarbonate. What mass of sodium bicarbonate is this?

mass (NaHCO3) = number of moles * molar mass

                           = 2.0 mol * 84.0065 g/mol

                           = 168.0 g

4 0
3 years ago
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