I need to know the answer to this question

Answer:

Ghana Empire is was a kingdom in western Africa.

The Oyo Empire was the ancient African Kingdom is located in western Africa.

The Oyo Empire prospered on regional trade and became a key facilitator in moving slaves from Africa's interior to the coast and waiting European sailing ships, with its capital at Old Oyo near the River.

The human trade was so extensive that this region of Africa became known simply as the "Slave Coast."

Finally, despite all efforts, the Oyo Empire became a protectorate of the United Kingdom in 1888; its states ceased to exist as a superpower, and it never regained its prominence in the region.

During the colonial period, however, the Yoruba were one of Africa's most urbanized groups.

Thus, the ancient African kingdom of the Oyo Empire was located in western Africa.

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Answer:

It is an ionic compound that consists of one calcium cation Ca2+ and two chlorine anions. The bivalent calcium metal forms an ionic bond with two chlorine atoms. The formation of cacl2 happens mainly by reacting limestone (CaCo3) with hydrochloric acid (HCl).

Answer:

La presión que ejerce es 42 atm.

Explanation:

La ley de Boyle relaciona la presión y el volumen y dice que  el volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión.

La ley de Boyle se expresa matemáticamente como:

P*V=k

Ahora es posible suponer que tienes un cierto volumen de gas V1 que se encuentra a una presión P1 al comienzo del experimento. Si varias el volumen de gas hasta un nuevo valor V2, entonces la presión cambiará a P2, y se cumplirá:

P1*V1= P2*V2

En este caso:

Reemplazando:

3 atm* 7 L= P2* 0.5 L

Resolviendo:

[tex]P2=\frac{3 atm*7 L}{0.5 L}[/tex]

P2= 42 atm

La presión que ejerce es 42 atm.

Answer:10.5

Explanation:

3atm x 7L / 0,5L = 10.5

Quando bajamos el volmen sube la presion y cuando bajamos la presion sube el volumen

Answer:

Polar

Explanation:

Electronegativity Difference:

0.7 Non-Polar Covalent = 0 0 < Polar Covalent < 2 Ionic (Non-Covalent) ≥ 2

Answer:

5/3 moles

Explanation:

3.moles.of H2 gives 3 moles of NH3

so 2.5 moles gives 5/3 moles.

Note:Apply simple. concept of unitary method.

Answer:

Aluminum

Explanation:

Given

[tex]T_1 = 25.2^oC[/tex]

[tex]T_2 = 55.1^oC[/tex]

[tex]m = 5.00g[/tex]

[tex]\triangle Q= 133J[/tex]

See attachment for chart

Required

Identify the unknown substance

To do this, we simply calculate the specific heat capacity from the given parameters using:

[tex]c = \frac{\triangle Q}{m\triangle T}[/tex]

This gives:

[tex]c = \frac{\triangle Q}{m(T_2 - T_1)}[/tex]

So, we have:

[tex]c = \frac{133J}{5.00g * (55.1C - 25.2C)}[/tex]

[tex]c = \frac{133J}{5.00g * 29.9C}[/tex]

[tex]c = \frac{133J}{149.5gC}[/tex]

[tex]c = 0.89\ J/gC[/tex]

From the attached chart, we have:

[tex]Al(s) = 0.89\ J/gC[/tex] --- The specific heat capacity of Aluminum

Hence, the unknown substance is Aluminum

Answer:

Vanished completely.

Explanation:

The atoms of starting substances are transformed into the ending substances because the starting substances mixed with each other and turn into new substances. The starting substances i.e. reactants vanished completely when the ending substances means products are formed completely so we can say that the vanishing of ending substance happened when the ending substances are formed.

Answer:

3

Explanation:

remember the equation percentage yield = actual/ theoretical yield as

4.20/4.88 x 100

86.065 so 86.1.

hope this make sense:)

The percentage yield of the product is 86.1%. The correct option is 3) 86.1%

From the question, we are to calculate the percentage yield of the product

Percentage yield can be calculated from the formula,

[tex]Percentage \ yield = \frac{Actual\ yield}{Theoretical \ yield} \times 100\%[/tex]

From the given information,

Actual yield = 4.20 g

Theoretical yield = 4.88 g

Putting the parameters into the formula, we get

[tex]Percentage \ yield = \frac{4.20}{4.88} \times 100\%[/tex]

Percentage yield = 0.86065574 × 100%

Percentage yield = 86.065574%

Percentage yield ≅ 86.1%

Hence, the percentage yield of the product is 86.1%. The correct option is 3) 86.1%

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Answer:

1. solid and liquid

2.Evaporation changes liquid water to water vapour.

Answer: i don't know i just want points sorry can you blame me you would do the same too i know you

Explanation:

yay i got 5 points

Answer:

sodium

Explanation:

sodium has 11 electrons.

Explanation:

dylalove464

06/11/2020

Hello,

In this case, we first compute the moles of oxygen in 0.654 g and 1.35 g by using its molar mass (32 g/mol):

Then, by using the ideal gas equation at the both states, given the same both temperature and volume:

We compute the volume at the second moles:

Best regards.

Answer:

3.41

Explanation:

:)

Answer:

The number of outermost energy level electrons ( valency electrons )

The atomic number

Answer:

2.05 L is the correct answer.

Explanation:

w = 64 g

c = 0.420 M

m = 40 + (16+1)×2 = 74

[tex]c = \frac{w}{m \times v} \\ \implies \: v = \frac{w}{c \times m} \\ = \frac{64}{0.420 \times 74} \\ = 2.05 \: \: liters[/tex]

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The volume of the solution is given below which can be calculated using the molarity formula.

d. 2.18 litres

It is defined as the ratio of number of moles of solute to the volume of the solution.

It is given by:

M= n/V

What information do we have?

M= 0.420M

mass = 64.0 grams

Molar Mass= 74g/mol

To find:

Volume of solution=?

Calculation for number of moles:

n= m/ M

n= 64/70

n= 0.91 moles

Molarity=  n/V

0.420 M= 0.91 moles /V

V= 0.91/ 0.420

V= 2.1768 litres

Thus, the volume of the solution is 2.18 litres.

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Answer:

radio and sound

Explanation:

Because they are waves in motion

Answer:

D. Strong nuclear force, electrostatic force, weak nuclear force, gravitational force

There are four fundamental or universal forces in nature. Without these forces, all matter in the world will fall apart. The relative strength of fundamental forces is Strong nuclear force, electrostatic force, weak nuclear force, gravitational force. Thus the correct option is D.

The fundamental forces are also called the fundamental interactions. All the known forces of the nature can be collectively called the fundamental forces. The four important fundamental forces are gravitational, electrostatic, strong and weak nuclear forces.

The gravitational force is the weakest fundamental force. It is an attractive force which arises from the gravitational interaction. The attractive as well as the repulsive force caused by the electrically charged particles is defined as the electrostatic force.

The nuclear force is the strongest attractive force. The strong nuclear forces hold the nuclei of atoms together. The weak nuclear forces are responsible for the radioactive decay.

Thus the correct option is D.

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The most appropriate option is :

[tex]\hookrightarrow \bf2. \: \mathrm{ \underline{oxygen \: \: and \: \: silicon}}[/tex]

Since, they are the most abundant elements found in Earth's Crust.

[tex]\circ { \underline{ \boxed{ \sf{ \color{green}{ \mathrm{hope \: \: it \: \: helps \: \: you .....}}}}}}∘[/tex]

Answer:

Explanation:

Hope this helps u!!

Answer:

the answer is D (つ°ヮ°)つ （＾ω＾）

Explanation:

unsnshdjdjjdjdhakwjwkejejrjnrnrnrnrnrnntjtjth

Answer:

Tick

1

2

4

6

Explanation:

magnesium is not a good conductor has some free electrons but it is not used that much in the industries because of other better alternatives.

You can tick number 5 as wlee. Good luck

Answer:

the answer is a

Explanation:

it'sa silver-white an earth metal

Answer:

1.72 M

Explanation:

Molarity is the molar concentration of a solution. It can be calculated using the formula a follows:

Molarity = number of moles (n? ÷ volume (V)

According to the information provided in this question, the solution has 58.7 grams of MgCl2 in 359 ml of solution.

Using mole = mass/molar mass

Molar mass of MgCl2 = 24 + 35.5(2)

= 24 + 71

= 95g/mol

mole = 58.7g ÷ 95g/mol

mole = 0.618mol

Volume of solution = 359ml = 359/1000 = 0.359L

Molarity = 0.618mol ÷ 0.359L

Molarity = 1.72 M

Answer:

[tex]\lambda = 9.376*10^{-8} m[/tex]

Explanation:

From the question we are told that:

 [tex]n=6level[/tex]

Generally the equation for Energy is mathematically given by

 [tex]E=\frac{hc}{\lambda}[/tex]

Since

Energy difference will be maximum when electron return to ground state

And Shortest wavelength is emitted when  there is largest energy difference

Therefore

 [tex]1/\lambda = R* (\frac{1}{nf^2} - \frac{1}{ni^2})[/tex]

Where

 [tex]R=Rydberg\ constant[/tex]

 [tex]R = 1.097*10^7[/tex]

Therefore

 [tex]1/\lambda = 1.097*10^7* ((\frac{1}{1^2} - \frac{1}{6^2})[/tex]

  [tex]\lambda = 9.376*10^{-8} m[/tex]

Answer:

wla dyan ang sagut ehh baka mali yan

Answer: Raw meat, poultry and seafood. Feces may get onto raw meat and poultry during the butchering process. ...

Raw eggs. ...

Fruits and vegetables.

Explanation:

Answer:

²³⁴₉₃Np.

Explanation:

We can obtain the daughter particle as follow.

Let ⁿₓM represent the daughter particle.

Thus, the equation for the reaction is given below :

²³⁴₉₂U —> ⁿₓM + ⁰₋₁e

Next, we shall determine n, x and M. This can be obtained as follow:

234 = n + 0

234 = n

n = 234

92 = x + (–1)

92 = x – 1

Volume like terms

92 + 1 = x

93 = x

x = 93

ⁿₓM => ²³⁴₉₃M => ²³⁴₉₃Np

Thus, the equation for the reaction becomes:

²³⁴₉₂U —> ²³⁴₉₃Np + ⁰₋₁e

The daughter particle => ²³⁴₉₃Np

Answer:

26.9%

Explanation:

I just took the test! :)

The percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water is 36.7%.

The percentage by mass of a solution can be calculated by dividing the mass of the solute by the mass of the solvent, then, multiplied by 100.

percent by mass = mass of solute/mass of solvent × 100

According to this question, 36.0 grams of HCl is dissolved in 98.0 grams of water. The percentage by mass is calculated as follows:

percent by mass = 36g/98g × 100

percent by mass = 36.7%.

Therefore, the percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water is 36.7%.

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Answer:

Nucleus and mitochondria. Organism.

Explanation:

The two main organelles are the nucleus and the mitochondria . The nucleus is boss of the factory(controls everything). The mitochondria is the power house of the cell (provides the energy). Humans are organisms (made of organs systems working together) . Another example is plants they are also organisms

Answer:

1) 7 moles

2) 82.4 grams approximately