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masha68 [24]
3 years ago
9

Why is it hot in summer and in the winter why is cold

Chemistry
2 answers:
grigory [225]3 years ago
8 0

Answer: The sun is closer to the Earth is the summer and farther in the winter causing it to be hotter than it is colder in the summer and vise versa for the other question.

Explanation: I learned it ;)

Rainbow [258]3 years ago
4 0

Explanation:

The earth is tipped on its axis, 23.5 degrees in respect to the sun. In the summer time, the northern hemisphere has slightly more hours of daylight because of this, becoming more extreme as one goes north. If you go far enough north, there is 24 hours of sunlight in high summer.

So the average temperature is higher, because there is sunlight is present for more hours and the earth is warmed on balance.

At the same time, the south pole is in shadow, so the southern hemisphere has winter in June.

Six months later, the 23.5 degree tilt has the north pole facing away from the sun, and with fewer daylight hours, the temperature cools progressively. Meanwhile, the southern hemisphere is having it’s summer in December.

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Identify solute and solvent in 80 solution of ethyl alcohol with water
diamong [38]
The solute is the part of the solution that dissolves in the second component (usually a fluid). Therefore, for the mentioned solution, the solute is ehyl alcohol since it is the one dissolving in water.

As for the solvent, it is the component in which the solute dissolves. In this case, it is water.
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4 years ago
How would the melting point of an ice cube compare to the melting point of a large ice sculpture?
Ad libitum [116K]

The ice sculpture would take longer to melt than the ice cube

7 0
3 years ago
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4. What mass of urea is produced from 9.0 liters of ammonia?
lana [24]

Answer:

12.07 g.

Explanation:

  • The balanced equation for the mentioned reaction is:

<em>2NH₃(g) + CO₂(g) → H₂NCONH₂(g) + H₂O(g),</em>

It is clear that 2.0 moles of NH₃ react with 1.0 mole of CO₂ to produce 1.0 mole of H₂NCONH₂ and 1.0 moles of H₂O.

  • Consider the reaction proceeds at STP conditions:

At STP, 9.0 L of NH₃ react with an excess of CO₂ gas:

It is known that at STP: every 1.0 mol of any gas occupies 22.4 L.

<u><em>using cross multiplication:</em></u>

1.0 mol of NH₃ represents → 22.4 L.

??? mol of NH₃ represents → 9.0 L.

∴ 9.0 L of NH₃ represents = (1.0 mol)(9.0 L)/(22.4 L) = 0.4018 mol.

  • To find the no. of moles of urea (H₂NCONH₂) produced:

<u><em>Using cross multiplication:</em></u>

2.0 mol of NH₃ produce → 1.0 mol of H₂NCONH₂, from stichiometry.

0.4018 mol of NH₃ produce → ??? mol of H₂NCONH₂.

∴ The no. of moles of H₂NCONH₂ = (1.0 mol)(0.4018 mol)/(2.0 mol) = 0.201 mol.

  • Now, we can find the mass of H₂NCONH₂ produced:

<em>mass = n * molar mass</em> = (0.201 mol) * (60.06 g/mol) = <em>12.07 g.</em>

8 0
3 years ago
3 C2H2(g) → C6H6(g) What is the standard enthalphy change ΔHo, for the reaction represented above? (ΔHof of C2H2(g) is 230 kJ mo
masha68 [24]

Answer: The standard enthalpy change  is -607kJ

Explanation:

The given balanced chemical reaction is,

3C_2H_2(g)\rightarrow C_6H_6(g)

First we have to calculate the enthalpy of reaction (\Delta H^o).

\Delta H^o=H_f_{product}-H_f_{reactant}

\Delta H^o=[n_{C_6H_6}\times \Delta H_f^0_{(C_6H_6)}]-[n_{C_2H_2\times \Delta H_f^0_{(C_2H_2)}]

where,

We are given:

\Delta H^o_f_{(C_2H_2)}=230kJ/mol\\\Delta H^o_f_{(C_6H_6)}=83kJ/mol

Putting values in above equation, we get:

\Delta H^o_{rxn}=[(1\times 83)]-[(3\times 230)]=-607kJ

The standard enthalpy change  is -607kJ

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umka21 [38]

Answer:

what are the options? I'll edit my answer to the correct one once you inform me lol

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