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4 years ago

How does density affect water circulation?

Chemistry

2 answers:

Kipish [7]4 years ago

4 0

Answer:

Im guessing it's C....................................................

dybincka [34]4 years ago

3 0

The answer is A for sure hope this helps

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An energy profile for the reaction A⇌B (left), and the change in concentration of B as a function of time (right), with and with

RoseWind [281]

Answer:

<em>What quantity dictates the speed of a reaction?</em> The activation energy

Explanation:

According to the collision theory, when molecules collide, they must overcome an energy barrier for the reaction to take place. This energy, known as activation energy, is represented by the difference in energy between the initial state and the transition state. The higher the activation energy, the slower the reaction. That's why catalysts reduce the activation energy to accelerate the reaction.

3 0

4 years ago

HELP <br> The question is in the picture, I will give 5 stars!

Fynjy0 [20]

The answer is 4.9 moles of salt will be needed to add to 1 kg of water to change the boiling point by 5 °C.

<h3>What is Boiling Point Elevation ?</h3>

Boiling point elevation is the phenomenon that occurs when the boiling point of a liquid (a solvent) is increased when another compound is added, such that the solution has a higher boiling point than the pure solvent.

Boiling point elevation occurs whenever a non-volatile solute is added to a pure solvent.

ΔT = i * Kb * m

where m, Kb and i are the molality of solution, ebullioscopic constant and Van't Hoff factor respectively

The data given in the question is ΔT = 5 °C

mass of solvent = 1 kg

Kb = 0.51 °C/(mol/kg)

Van't Hoff Factor for NaCl is 2

Substituting the values in the above equation

$\rm 5 = \rm\dfrac{2\times0.51\times moles \;of \;salt}{1}$

$\rm moles \;of \;salt = \rm\dfrac{5}{2\times0.51}$

moles of salt = 4.9

Therefore 4.9 moles of salt will be needed to add to 1 kg of water to change the boiling point by 5 °C.

To know more about Boiling point elevation

brainly.com/question/17218953

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6 0

2 years ago

14.

Vesnalui [34]

Answer:

Mass = 72.52 g

Explanation:

Given data:

Mass of hydrogen phosphate produced = ?

Mass of P₂O₅ react = 105.9 g

Solution:

Chemical equation:

P₂O₅ + 3H₂O → 2H₃PO₄

Number of moles of P₂O₅:

Number of moles = mass/molar mass

Molar mass of P₂O₅ 283.9 g/mol

Number of moles = 105.9 g/ 283.9 g/mol

Number of moles = 0.37 mol

Now we will compare the moles of P₂O₅ with H₃PO₄ from balance chemical equation.

P₂O₅ : H₃PO₄

1 : 2

0.37 : 2/1×0.37= 0.74 mol

Mass of H₃PO₄ :

Mass = number of moles × molar mass

Mass = 0.74 mol × 98 g/mol

Mass = 72.52 g

7 0

3 years ago

Given the following equation: 4 Fe + 3022 Fe2O3 What mass of iron is needed

icang [17]

Answer : The mass of iron needed is 29.5 grams.

Explanation : Given,

Mass of $O_2$ = 12 g

Molar mass of $O_2$ = 32 g/mol

First we have to calculate the moles of $O_2$ .

$\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}$

$\text{Moles of }O_2=\frac{12g}{32g/mol}=0.375mol$

Now we have to calculate the moles of $Fe$

The balanced chemical equation is:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

From the reaction, we conclude that

As, 3 moles of $O_2$ react with 4 moles of $Fe$

So, 0.375 mole of $O_2$ react with $\frac{4}{3}\times 0.375=0.5$ mole of $Fe$

Now we have to calculate the mass of $Fe$

$\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe$

Molar mass of $Fe$ = 59 g/mole

$\text{ Mass of }Fe=(0.5moles)\times (59g/mole)=29.5g$

Therefore, the mass of iron needed is 29.5 grams.

8 0

4 years ago

Flammable liquids are those that have a flashpoint of:.

marin [14]

Answer:

Flammable liquid is any liquid having a flashpoint at or below 199.4 °F (93 °C).

Explanation:

5 0

2 years ago