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3 years ago

Briefly explain why there is a constant temperature plateau in the cooling curve

1 answer:

4 0

This plateau is where a phase change occurs. Likely, this cooling curve observes the changing of a liquid into a solid (so that the temperature is quantifiable). As something cools, it’s losing energy to the surroundings; when a phase change occurs, like liquid to solid, energy isn’t lost directly from the atom, but instead the energy maintained by free motion of the atom is used. This lack of motion reduces it into a lattice (all while maintaining a constant internal energy), finalizing the phase change, after which energy is lost directly from the atom again.

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What is a solute that dissolves in a solvent called

Dvinal [7]

In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

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3 years ago

A florist prepares a solution of nitrogen-phosphorus fertilizer by dissolving 5.66 g of NH4NO3 and 4.42 g of (NH4)3PO4 in enough

motikmotik

Answer:

0.00725 M

Explanation:

Considering for $NH_4NO_3$

Mass = 5.66 g

Molar mass of $NH_4NO_3$ = 80.043 g/mol

Moles = Mass taken / Molar mass

So,

Moles = 5.66 / 80.043 moles = 0.0707 moles

$NH_4NO_3$ will dissociate as:

$NH_4NO_3\rightarrow NH_4^++NO_3^-$

Thus 1 mole of $NH_4NO_3$ yields 1 mole of ammonium ions. So,

Ammonium ions furnished by $NH_4NO_3$ = 1 × 0.0707 moles = 0.0707 moles

Considering for $(NH_4)_3PO_4$

Mass = 4.42 g

Molar mass of $(NH_4)_3PO_4$ = 149.09 g/mol

Moles = Mass taken / Molar mass

So,

Moles = 4.42 / 149.09 moles = 0.0296 moles

$(NH_4)_3PO_4$ will dissociate as:

$(NH_4)_3PO_4\rightarrow 3NH_4^++PO_4^{3-}$

Thus 1 mole of $NH_4NO_3$ yields 3 moles of ammonium ions. So,

Ammonium ions furnished by $(NH_4)_3PO_4$ = 3 × 0.0296 moles = 0.0888 moles

Total moles of the ammonium ions = 0.0707 + 0.0888 moles = 0.1595 moles

Given that:

Volume = 22.0 L

So, Molarity of the $NH_4^+$ is:

Molarity = Moles / Volume = 0.1595 / 22 M = 0.00725 M

8 0

3 years ago

saveliy_v [14]

Answer:

Is A- Carbon Dioxide

Explanation:

other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth's surface.

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2 years ago

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Give the ground-state electron configuration for each of the following elements. After each atom is its atomic number in parenth

Anni [7]

Answer:

(a) ₁₉K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

(b) ₁₀Ne: 1s² 2s² 2p⁶

---

(a) 3

(b) 6

Explanation:

We can state the ground-state electron configuration for each element following Aufbau's principle.

(a) ₁₉K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

(b) ₁₀Ne: 1s² 2s² 2p⁶

Second part

(a) Al belongs to Group 13 in the Periodic Table. It has 13-10=3 electrons in the valence shell.

(b) O belongs to Group 16 in the Periodic Table. It has 16-10=6 electrons in the valence shell.

3 0

2 years ago

How would scientific experiments change if scientists had no tools to use?

UNO [17]

They wouldn't get good data because how would they look deeper into the experiment

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2 years ago

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