If the partial pressure of N2 in a scuba divers blood at the surface is 0.79 atm, what will the pressure be if he/she descends to a depth of 30 meters (4 atm) and stays there long enough to reach equilibrium (b)

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Answer 1
Answer:

Answer:

If the partial pressure of N2 in a scuba divers blood at the surface is 0.79 atm, what will the pressure be if he/she descends to a depth of 30 meters (4 atm) and stays there long enough to reach equilibrium (b)

Explanation:

for every 3m that the internal pressure is lowered, it increases in an atmosphere approximately, so when the blood pressure of nitrogen decreases 30m, it will increase by approximately 10 atm, being enough there for the body to enter into equilibrium


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1. On the basis of your results, what is the relationship between the temperature of the solvent and the rate of solution formation?

The air temperature surrounding a snowy driveway is 0ºC. One side of the driveway is shaded, while the other side is sunny. The snow on the sunny side melts. Which statement is true? The snow absorbed chemical energy to produce a chemical change. The snow absorbed heat energy to produce a chemical change. The snow released heat energy to produce a physical change. The snow absorbed radiant energy to produce a physical change.

Answers

Energy conversion can alter the state of matter by the release or absorption of energy. The snow on the driveway absorbed radiant energy to produce a physical change. Thus, option D is correct.

What is a physical change?

A physical change is a temporary change that is for a shorter duration of time and has been reversible as now new substance formation takes place. Instead, the old substance undergoes a change in the state of matter.

Snow is a solid state that absorbs radiant heat from the sun to get converted into water by melting. The melting of snow is a physical change as the state of matter gets altered by the absorption of energy. No chemical composition or properties were altered.

Therefore, option D. the melting of snow is a physical change.

Learn more about physical change, here:

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Answer:

The snow absorbed radiant energy to produce a physical change.

Explanation:

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C=46.67%, H=4.48%, N=31.10%, O=17.76%.
The molecular weight is 180.16g/mol.

Answers

Answer:

C_7H_8N_4O_2

Explanation:

Hello!

In this case, since the determination of an empirical formula is covered by first computing the moles of each atom as shown below:

n_C=(46.47g)/(12g/mol)=3.9mol\n\n n_H=(4.48g)/(1g/mol) =4.5mol\n\nn_N=(31.10g)/(14g/mol) =2.2mol\n\nn_O=(17.76g)/(16g/mol) =1.1mol

Now, we divide each moles by the fewest moles (those of oxygen), to obtain the subscripts in the empirical formula:

C:(3.9)/(1.1)=3.5 \n\nH:(4.5)/(1.1)=4 \n\nN:(2.2)/(1.1) =2\n\nO:(1.1)/(1.1) =1

Thus, the empirical formula, taken to the nearest whole subscript is:

C_7H_8N_4O_2

Whose molar mass is 180.16, therefore the empirical formula is the same to the molecular one.

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1. What is a wave?a.) a vibrating disturbance that transfers energy from place to place
b.) a material which a wave travels through
c.) an area where coils spread out
d.) the maximum distance a medium moves from its rest position

Answers

Answer:

A.

Explanation:

A wave is a disturbance that moves energy from one place to another. Only energy — not matter — is transferred as a wave moves. The substance that a wave moves through is called the medium. That medium moves back and forth repeatedly, returning to its original position. But the wave travels along the medium

Calculate the pH of a titration at the point when 15.0 mL of 0.15 M NaOH is added to 30.0 mL 0f 0.20 M HNO.

Answers

Answer:

The correct answer is 1.10.

Explanation:

Based on the given information, the molarity of the NaOH is 0.15 M, that is, 0.15 moles per liter of the solution.

Now the moles present in the 15 ml of the solution will be,  

0.015 × 0.15 = 2.25 × 10⁻³ moles of NaOH or 0.0025 moles of NaOH

Now, molarity of the HNO₃ given is 0.20 M, which means 0.2 moles per liter of the solution.  

Now the moles present in the 30 ml of the solution will be,  

0.030 × 0.2 = 0.006 moles of HNO₃

Now the complete disintegration of acid and base will be,  

NaOH (aq) (0.025 moles) ⇔ Na⁺ (aq) (0.025) + OH⁻ (aq) (0.025 moles)

HNO₃ (aq) (0.006 moles) ⇔ H⁺ (0.006 moles) + NO₃⁻ (aq) (0.006 moles)

Now the additional Hydrogen ions at titration point is,  

= 0.006 - 0.0025 = 0.0035 moles of H+

Now the concentration of H+ ions in the 45 ml of the solution will be,  

= 0.0035/45 × 1000

= 0.078 M

pH = -log[H⁺] = -log [0.078]

= 1.10

The amount of order in an isolated system cannot increase; it may only stay the same or decrease. This expresses which of the following?Conservation of mass
The First Law of Thermodynamics
The second Law of Thermodynamics
Kinetic Theory
The definition of work
the definition of heat

Answers

Answer:

Second law of thermodynamics.

Explanation:

Second law of thermodynamics states the entropy or order in an isolated system always increases. The isolated system evolve spontaneously toward thermal thermal equilibrium.

For example if a room is untidy and dirty,it will become messy over time and disorder. So when the room is cleaned, there won't be disorderliness and entropy will decrease.

Chlorine (Cl2Cl2) is a strong germicide used to disinfect drinking water and to kill microbes in swimming pools. If the product is Cl−Cl−, was the elemental chlorine oxidized or reduced?

Answers

Answer:

The elemental chlorine was reduced

Explanation: inl the elemental form, the oxidation state of chlorine is =0 on been reduced to Cl-Cl-, the oxidation state reduces to -1