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2 years ago

3. Describe the process behind how students recover an individual's remains from a surface grave.

Chemistry

1 answer:

dexar [7]2 years ago

5 0

Answer:

By using the techniques of archeology.

Explanation:

Students recover an individual's remains from a surface grave by using the techniques of archeology field to scrape away the layers of soil from that remains in a way that the remains can't be damaged. If they find the remains within 10 centimeters of digging, they can dig down further in order to dig out all the remains safely. The instruments of archeology field are used because they are light and can be used to dig out fossils of ancient organisms.

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Type the correct answer in the box. a pharmacist works with a 1.75 m solution of sodium bromide (nabr) and water. the volume of

Elodia [21]

Answer: 147 mL

Explanation:

Given:

Molarity of the sodium bromide (NaBr) solution (M1) = 1.75 M

Volume of the solution (V1) = 84 mL

Molarity of the diluted NaBr solution (M2) = 1 M

Using the dilution formula to solve for V2:

$\begin{gathered}M_{1} V_{1}=M_{2} V_{2} \\V_{2}=(1.75 \mathrm{M} \times 84 \mathrm{~mL}) / 1 \mathrm{M} \\V_{2}=147 \mathrm{~mL}\end{gathered}$

Therefore, the new volume of the solution is 147 mL

8 0

1 year ago

A vessel of 120ml capacity contains a certain amount of gas at 35°C and 1.2 bar pressure. The gas is transferred to another vess

Rainbow [258]

Given parameters:

Initial volume = 120ml

Initial temperature = 35°C

Initial pressure = 1.2bar

Final volume = 180ml

Final temperature = 35°C

Unknown:

Final pressure = ?

To solve this problem, we apply the combined gas law. The expression is given below;

$\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }$

Where P₁ is the initial pressure

P₂ is the final pressure

V₁ is the initial volume

V₂ is the final volume

T₁ is the initial temperature

T₂ is the final temperature

We need to convert the parameters to standard units

take the volume to dm³;

1000ml = 1dm³

120ml = $\frac{120}{1000}$ dm³ = 0.12dm³ = initial volume

Final volume;

1000ml = 1dm³

180ml = $\frac{180}{1000}$ dm³ = 0.18dm³

Now, the temperature;

K = 273 + °C

Initial temperature = 273 + 35 = 308k

Final temperature = 308k

We then input the parameters into the equation;

$\frac{1.2bar x 0.12 }{308} = \frac{P_{2} x 0.18 }{308}$

Solving for P₂;

P₂ = 0.8bar

The new pressure or final pressure in the vessel is 0.8bar

5 0

2 years ago

Marcela dissolves 80.0 g of ammonium nitrate in 50.0 mL of water at room temperature and notes that the temperature of the solut

seraphim [82]

Answer: The correct answer is A

Explanation:

On addition of the ammonium nitrate to 50 ml of water the temperature decreases which means that reaction between the ammonium nitrate and water is an endothermic reaction.The value of $\Delta H$ is positive for an endothermic reactions.

$\Delta H>0$

Entropy is a degree of randomness of the system.

On addition of the ammonium nitrate to water ammonium nitrate break down into ions which means that entropy is increased.

$\Delta S>0$

$\Delta G=\Delta H-T\Delta S$ (Gibb's free energy)

Since, ammonium nitrate is getting dissolved in water which means that this reaction is spontaneous and $\Delta G$ of spontaneous reaction is negative that is: