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Helen [10]
3 years ago
6

Maila states that a certain layer of the sun is like the main engine of a car where all the energy required to make the car work

is produced.
Which layer of the sun is Malia referring to?

A) convective zone
B) inner core
C) photosphere
D) radiative zone
Chemistry
2 answers:
Sladkaya [172]3 years ago
8 0

Answer:

B. Inner Core

Explanation:

Maila states that a certain layer of the sun is like the main engine of a car where all the energy required to make the car work is produced.  

exis [7]3 years ago
3 0
Answer is: <span>B) inner core.
</span>The Sun interior is divided into three regions: the inner core<span>, the </span>radiative zone<span> and the </span><span>convection zone.
</span><span>The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
</span>Radiative zone is a<span>round the inner core and in this area</span><span> energy is transported by </span>radiation.
The convection zone is the outer-most layer of the interior and in this area energy is transported by convection.
You might be interested in
FeSO4 • 7H2O
Mrac [35]

Answer:

1. Percent by mass of H₂O = 45.3%

2. Percent by mass of anhydrous Salt (FeSO₄) = 54.7 %

Explanation:

Data Given

Formula of the Molecule = FeSO₄ • 7H₂O

% by mass water (H₂O) = ?

% by mass FeSO₄ = ?

________________________________________

> First of all find the atomic masses of each component in a molecule

For H₂O atomic masses are given below

H = 1 g/mol

O = 16 g/mol

> Then find the total mass of H₂O in haydrated salt

7H₂O = 7 (2x1 +1x16) g/mol

7H₂O = 7 (2+16) g/mol

7H₂O = 7 (18) g/mol

7H₂O = 126 g/mol

> find total Molar Mass of Molecule:

Molar Mass of FeSO₄ • 7H₂O = [56+ 32 + 16x4] + 7(2+16)

Molar Mass of FeSO₄ • 7H₂O = [56+ 32 + 64] + 126

Molar Mass of FeSO₄ • 7H₂O = [56+ 32 + 64] + 126

Molar Mass of FeSO₄ • 7H₂O = 278

Now to find the mass by percent of H₂O

Formula used to find the mass by percent of a component

Percent composition of  H₂O = mass of H₂O in Molecule / molar mass of FeSO₄ • 7H₂O x 100%  

Put the values

Percent by mass of H₂O = 126 (g/mol) / 278 (g/mol) x 100%

Percent by mass of H₂O = 0.4532 x 100%

Percent by mass of H₂O = 45.3%

_______________________________________________

> First of all find the atomic masses of each component in a molecule

For anhydrus salt (FeSO₄) atomic masses are given below

Fe = 56 g/mol

S= 32 g/mol

O = 16 g/mol

> Then find the total mass of FeSO₄ in haydrated salt

FeSO₄ = (56x1 + 32 + 4x16) g/mol

FeSO₄ = ( 56 + 32 + 64) g/mol

FeSO₄ = 152 g/mol

> find total Molar Mass of Molecule:

Molar Mass of FeSO₄ • 7H₂O = [56+ 32 + 16x4] + 7(2+16)

Molar Mass of FeSO₄ • 7H₂O = [56+ 32 + 64] + 126

Molar Mass of FeSO₄ • 7H₂O = [56+ 32 + 64] + 126

Molar Mass of FeSO₄ • 7H₂O = 278

Now to find the mass by percent of FeSO₄

Formula used to find the mass by percent of a component

Percent composition of  FeSO₄ = mass of FeSO₄ in Molecule / molar mass of FeSO₄ • 7H₂O x 100%  

Put the values

Percent by mass of FeSO₄ = 152 (g/mol) / 278 (g/mol) x 100%

Percent by mass of FeSO₄ = 0.547 x 100%  

Percent by mass of FeSO₄ = 54.7 %

4 0
4 years ago
Read 2 more answers
In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. The solu
Wewaii [24]

Answer:

1 and 2 - Physical change

3, 4, 5 and 6 - Chemical Change

Explanation:

A physical change is the conversion of one form into another. Like water is in natural state is liquid but at applying negative temperature like in a freezer, it will convert into ice which is just another form of water. At high temperature, water will convert into vapors and form steam. In all three states, water is just water in a different form. That's what a physical change is. It is a reversible process.

A chemical change is the conversion of one molecule into another form which cannot be reversed. Like burning of coal. You won't get coal after you have burnt it.

In the same experiment, there have been many physical and chemical changes.

1. Evaporation of Ethanol is a physical change as external heat is applied which separates ethanol from water in form of vapors.

2. Condensation of Ethanol is also a physical change where vapors of ethanol are being converted into liquid form.

3. Formation of carbon deposit inside the flask: This is a chemical change. As the experiment contained glucose, upon higher temperatures, glucose loses water molecules and forms carbon. Now, since we cannot convert carbon back to glucose in a simple step, therefore, it is a chemical change which cannot be reversed.

4. Formation of Carbon dioxide gas from Glucose: This is a chemical change. Carbon dioxide cannot be fixed into glucose without the help of a plant or certain chemical methods therefore it is a chemical change and cannot be reversed by normal means.

5. Burning of natural gas: It is a chemical process. Natural gas contains methane as the primary source of burning. It reacts with oxygen present in air and forms carbon dioxide and water and releases heat which is used to elevate the temperature of ethanol-water mixture to obtain purified ethanol.

6. Formation of ethanol from glucose by yeast:  It is also a chemical process, biochemical to be specific. Under the absence of air (Fermentation), yeast converts glucose to ethanol which is a chemical process because glucose has been used up and is not glucose anymore. It has been converted to ethanol.

4 0
3 years ago
A slide 3.3 m long makes an angle of 32° with the ground. How high is the top of the slide above the ground?
Lyrx [107]
Sin 32 = height/3.3 m
height = sin 32 (3.3 m)
height = 1.75 m
7 0
3 years ago
Please help me out! :))
Leto [7]

Answer:

Pretty sure its B sorry if im wrong

Explanation:

4 0
3 years ago
A 0.2 M carboxylic acid (RCOOH) has a Ka = 1.66x10-6. What is the pH of this solution? Enter to 2 decimal places.
maria [59]

Answer:

3.24

Explanation:

The dissociation equation for the carboxylic acid can be represented as follows:

RCOOH —-> RCOO- + H+

We can use an ICE table to get the value of the concentration of the hydrogen ion. ICE stands for initial, change and equilibrium.

RCOOH RCOO- H+

Initial 0.2 0.0. 0.0

Change -x +x. +x

Equilibrium 0.2-x. x. x

We can now find the value of x as follows:

Ka = [RCOO-][H+]/[RCOOH]

(1.66* 10^-6) = (x * x)/(0.2-x)

(1.66 * 10^-6) (0.2-x) = x^2

x^2 = (3.32* 10^-7) - (1.66*10^-6)x

x^2 + (1.66 * 10^-6)x - (3.32* 10^-7) = 0

Solving the quadratic equation to get x:

x = 0.0005753650094369094 or - 0.0005753650094369094

As concentration cannot be negative, we discard the negative answer

Hence [H+] = 0.0005753650094369094

By definition, pH = -log[H+]

pH = -log(0.0005753650094369094)

pH = 3.24

8 0
3 years ago
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