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3 years ago

15

In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This tran

sfer is known as __________.
a.Electromagnetic radiation

B.Convection

C. Solar flares

D. Conduction

1 answer:

maks197457 [2]3 years ago

6 0

Answer:

solar flares

Explanation:

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A sample of solid sodium hydroxide, weighing 13.20 grams is dissolved in deionized water to make a solution. What volume in mL o

Andreas93 [3]

<h3>Answer:</h3>

2.809 L of H₂SO₄

<h3>Explanation:</h3>

Concept tested: Moles and Molarity

In this case we are give;

Mass of solid sodium hydroxide as 13.20 g

Molarity of H₂SO₄ as 0.235 M

We are required to determine the volume of H₂SO₄ required

<h3>First: We need to write the balanced equation for the reaction.</h3>

The reaction between NaOH and H₂SO₄ is a neutralization reaction.
The balanced equation for the reaction is;

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

<h3>Second: We calculate the umber of moles of NaOH used </h3>

Number of moles = Mass ÷ Molar mass
Molar mass of NaOH is 40.0 g/mol

Therefore;

Moles of NaOH = 13.20 g ÷ 40.0 g/mol

= 0.33 moles

<h3>Third: Determine the number of moles of the acid, H₂SO₄</h3>

From the equation, 2 moles of NaOH reacts with 1 mole of H₂SO₄
Therefore, the mole ratio of NaOH: H₂SO₄ is 2 : 1.
Thus, Moles of H₂SO₄ = moles of NaOH × 2

= 0.33 moles × 2

= 0.66 moles of H₂SO₄

<h3>Fourth: Determine the Volume of the acid, H₂SO₄ used</h3>

When given the molarity of an acid and the number of moles we can calculate the volume of the acid.

That is; Volume = Number of moles ÷ Molarity

In this case;

Volume of the acid = 0.66 moles ÷ 0.235 M

= 2.809 L

Therefore, the volume of the acid required to neutralize the base,NaOH is 2.809 L.

7 0

4 years ago

Explain why having a thick, heavy chimney is a better idea than a thin, metal chimney for heating a home all winter long, especi

MA_775_DIABLO [31]

The major idea behind why having a thick, heavy chimney over a thin, metal chimney for heating a home for a longer period is because it retains a lot of heat and this means energy saving, hence it fuel efficient and cost effective

A metal is a good conductor of heat, this property will make it easily give out head that is needed to the surrounding especially at night, therefore a thick chimney especially made from clay material will be a better choice over a thin metal

Learn more:

brainly.com/question/24792291

6 0

3 years ago

0.158 g of a mystery molecule is placed into a bomb calorimeter that has a heat capacity of 1650 J/C. After the sample is combus

Lunna [17]

<u>Answer:</u> The molar mass of the mystery element is 111.27 g/mol

<u>Explanation:</u>

To calculate the heat absorbed by the calorimeter, we use the equation:

$q=c\Delta T$

where,

q = heat absorbed

c = heat capacity of calorimeter = 1650 J/°C

$\Delta T$ = change in temperature = $2.54^oC$

Putting values in above equation, we get:

$q=1650J/^oC\times 2.54^oC=4191kJ$

Heat absorbed by the calorimeter will be equal to the heat released by the reaction.

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

To calculate the number of moles of the mystery molecule, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

q = amount of heat released = -4191 J

n = number of moles = ? moles

$\Delta H_{rxn}$ = enthalpy change of the reaction = -2960 kJ/mol = -2960000 J/mol (Conversion factor = 1 kJ = 1000 J)

Putting values in above equation, we get:

$-2960000=\frac{-4191J}{n}\\\\n=\frac{-4191}{-2960000}=0.00142mol$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of mystery molecule = 0.158 g

Moles of mystery molecule = 0.00142 mol

Putting values in above equation, we get:

$0.00142mol=\frac{0.158g}{\text{Molar mass of mystery molecule}}\\\\\text{Molar mass of mystery molecule}=\frac{0.158}{0.00142}=111.27g/mol$

Hence, the molar mass of the mystery element is 111.27 g/mol

8 0

3 years ago

Which domain consists of single-celled organisms, some of which can be treated with anitibiotics

Aneli [31]

I got bacteria for this one................

3 0

3 years ago

Read 2 more answers

When two immiscible liquids are mixed, what physical property determines which solvent layer will be on top?

Digiron [165]

Answer:

Density of the liquid.

Explanation:

Density is the mass per unit volume of a substance.

At specific volume of each immiscible substance, the substance with lower relative molecular mass has the lower density and such floats.

Thus, the physical properties that determines the solvent layer that will be on top is DENSITY.

3 0

4 years ago