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3 years ago

Which direction does the sun to move across the sky

Chemistry

2 answers:

Ierofanga [76]3 years ago

6 0

Answer:

EAST is the answer

Explanation:

For the moment, let us just think about one motion - - Earth's spin (or rotation) on its axis. Earth rotates or spins toward the east, and that's why the Sun, Moon, planets, and stars all rise in the east and make their way westward across the sky.

sineoko [7]3 years ago

6 0

Answer:

The Sun, although it appears so, does not actually move across the sky.

However, it appears to go west

I hope this helps

Explanation:

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Is the following compound symmetrical going across?

Nataliya [291]

Answer:

Yes

Explanation:

A molecule has a center of symmetry when, for any atom in the molecule, an identical atom exists diametrically opposite this center an equal distance from it(Wikipedia).

A center of symmetry is said to exist in a molecule when reflection of all parts of the molecule through the center of symmetry produces an indistinguishable configuration(Housecroeft and Sharpe,2012)

Obviously, the Cl2 molecule has a center of symmetry, hence it is symmetrical. Reflection of the molecules through its center of symmetry produces an indistinguishable configuration.

7 0

3 years ago

What volume in L of a 0.724 M Nal solution contains 0.405 mol of Nal?

Setler [38]

Answer:

0.559 L

Explanation:

Step 1: Given data

Moles of sodium iodide (n): 0.405 mol

Molar concentration of sodium iodide (M): 0.724 M (0.724 mol/L)

Step 2: Calculate the volume of solution (V)

The molarity is equal to the moles of solute divided by the liters of solution.

M = n/V

V = n/M

V = 0.405 mol/(0.724 mol/L) = 0.559 L

4 0

3 years ago

Read 2 more answers

The air at the top of Mount Everest has pressures of 201.0 torr N2, 50.0 torr O2, 2.0 torr Ar, and 0.5 torr CO2. What is the tot

nordsb [41]

Answer:

The total air pressure at the top of the highest peak in the world is 253.5 torr

Explanation:

The partial pressures of the gases present at the top of Mount Everest are;

Nitrogen, N₂ = 201.0 torr

Oxygen, O₂ = 50.0 torr

Argon, Ar = 2.0 torr

Carbon dioxide, CO₂ = 0.5 torr

By Dalton's law of partial pressure, the total pressure that a mixture of gases exerts is equal to the sum of the partial pressures of the individual gases

Mathematically, the law can be expressed as follows;

Total pressure, P = ∑P $_i$ = P₁ + P₂ + · · ·

From which we have;

The total air pressure at the top of the highest peak in the world, Mount Everest, $P_{Total Mont Everest}$ = The sum of the partial pressures of N₂, O₂, Ar, and CO₂

$P_{Total Mont Everest}$ = 201.0 torr + 50.0 torr + 2.0 torr + 0.5 torr = 253.5 torr

$P_{Total Mont Everest}$ = 253.5 torr = 0.33355263 atmosphere

Therefore, the total air pressure at the top of the highest peak in the world, $P_{Total Mont Everest}$ = 253.5 torr

3 0

2 years ago

Which of the following processes have a ?S > 0?

Ne4ueva [31]

Answer: Cesium chloride dissolves in pure water has $\Delta S$ > 0.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

a) $2HCl(g)\rightarrow H_2(g)+Cl_2(l)$

As 2 moles of gas are converting to 1 mole of gas and 1 mole of liquid, the randomness decreases and hence $\Delta S$ is negative.

b) $2NH_3(g)+CO_2(g)\rightarrow NH_2CONH_2(aq)+H_2O(l)$

As gas molecules are converting into aqueous and liquid form, the randomness decreases and hence $\Delta S$ is negative.

c) lithium fluoride forms from its elements: $2Li+F_2\rightarrow 2LiF$

As elements are combining to form a compound, the randomness decreases and hence $\Delta S$ is negative.

d) Cesium chloride dissolves in pure water : $CaCl_2(s)\rightarrow Ca^{2+}(aq)+2Cl^-(aq)$

As compound is dissociating into ions, the randomness increases and hence $\Delta S$ is positive.

3 0

3 years ago

A 31.5 g wafer of pure gold initially at 69.4 ∘C is submerged into 63.4 g of water at 27.4 ∘C in an insulated container.

liubo4ka [24]

Answer: The final temperature of both substances at thermal equilibrium is 301.0 K

Explanation:

$heat_{absorbed}=heat_{released}$

As we know that,

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]$ .................(1)

where,

q = heat absorbed or released

$m_1$ = mass of gold = 31.5 g

$m_2$ = mass of water = 63.4 g

$T_{final}$ = final temperature = ?

$T_1$ = temperature of gold = $69.4^oC=342.4K$

$T_2$ = temperature of water = $27.4^oC=300.4K$

$c_1$ = specific heat of gold = $0.129J/g^0C$

$c_2$ = specific heat of water= $4.184J/g^0C$

Now put all the given values in equation (1), we get

$-31.5\times 0.129\times (T_{final}-342.4)=[63.4\times 4.184\times (T_{final}-300.4)]$

$T_{final}=301.0K$

The final temperature of both substances at thermal equilibrium is 301.0 K

4 0

3 years ago