What does the line with “alternating spikes and semicircles” mean?

Answer:

The circulatory system

Explanation:

Hope this helps

Answer:

.biology and maybe physics

Answer:

Biologist

ExplanationBiologist Unlike the above type of scientist, geoscientists’ work involves exploring the earth and its internal environment. They study the composition, structure, and processes of the earth by being indoors and outdoors. They contribute to the discovery of mines, petroleum deposits, minerals, and other aspects of the earth.

Answer:

1.204 × 10^24 formula units

Explanation:

Using the following formula to convert mass of iron (III) chloride to moles;

mole = mass/molar mass

Molar mass of FeCl3 = 56 + 35.5(3)

= 56 + 106.5

= 162.5g/mol

Mole = 325/162.5

mole = 2mol

Next, to calculate the formula units of FeCl3, we multiply the number of moles of FeCl3 by Avagadro number (6.02 × 10^23)

Formula units of FeCl3 = 2 × 6.02 × 10^23

12.04 × 10^23

= 1.204 × 10^24 formula units.

Answer: The partial pressure of Ne is 9.02 atm.

Explanation:

Given: Total pressure = 14.9 atm

Partial pressure of He = 1.43 atm

Partial pressure of Ar = 4.45 atm

Partial pressure of Ne = ?

According to the Dalton's law of partial pressures the total pressure exerted by the a number of gases in a mixture is equal to the sum of partial pressures of each gas present in the mixture.

Now, for the given mixture the partial pressure of Ne is as follows.

Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne

Substitute the values into above formula as follows.

Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne

14.9 atm = 1.43 atm + 4.45 atm + Partial pressure of Ne

Partial pressure of Ne = 14.9 atm - 5.88 atm

= 9.02 atm

Thus, we can conclude that the partial pressure of Ne is 9.02 atm.

Answer:

l and t

Explanation:

because they are in group one

Answer:

L & T

since are found in the same group.

Answer:

The answer is below

Explanation:

Certain countries like Germany under Adolf Hitler favored military solutions to the great depression because the government felt that having a mass production of military weapons and recruitment of unemployed people or citizens into the army would change the dire situation.

On the other hand, countries like the United States did not favor the military solutions but instead choose the NEW DEAL under Franklin D Roosevelt; the reason could be linked to their democratic culture, the isolation belief tendency.

Answer:

Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.

Answer:

Half of the solar radiation is absorbed and converted to infrared (heat).

Explanation:

Answer:

See Explanation

Explanation:

A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.

If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.

Answer:

ionic

Explanation:

I don't know if this correct

Answer:

electricity

Explanation:

A circuit is used in every electrical and electronics operation.

Answer:

The answer is gamma rays.

Explanation:

Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies on the electromagnetic spectrum.

Answer:

400 L

Explanation:

As this problem deals with a dilution process, we can use the following formula:

Where subscript 1 stands for the concentrated concentration and volume, while 2 stands for the diluted values. Meaning that in this case:

We input the data:

And solve for V₂:

Answer:

65.56 M

Explanation:

Using the formula as follows:

C1V1 = C2V2

Where;

C1 = initial concentration (M)

C2 = final concentration (M)

V1 = initial volume (L)

V2 = final volume (L)

According to the information in this question,

C1 = 1,049 M

C2 = ?

V1 = 120 mL

V2 = 1,920 mL

Using C1V1 = C2V2

1049 × 120 = C2 × 1920

125880 = 1920C2

C2 = 125880 ÷ 1920

C2 = 65.56 M

Answer:

a

Explanation:

me say so

Answer:

C

Explanation:

Answer:

[tex]2Zn+PbCl_4\rightarrow 2ZnCl_2+Pb[/tex]

Explanation:

Hello there!

In this case, when referring to single replacement reactions, it is crucial for us to figure out the formula of the starting reactants; thus, we know zinc is Zn and lead (IV) chloride is PbCl₄. In such a way, the reaction proceeds as follows:

[tex]Zn+PbCl_4\rightarrow ZnCl_2+Pb[/tex]

Which must be balanced as shown below:

[tex]2Zn+PbCl_4\rightarrow 2ZnCl_2+Pb[/tex]

Regards!

Answer:

Concrete

Explanation:

Answer:

0.502mol

Explanation:

The balanced chemical equation of the reaction described in this question is as follows:

2KClO3 → 2KCl+ 3O2

According to the equation above, 2 moles of KClO3 will produce 2 moles of KCl.

Using mole = mass/molar mass to convert mass of KClO3 to moles

Molar mass of KClO3 = 39 + 35.5 + 16(3)

= 39 + 35.5 + 48

= 122.5g/mol

mole = 61.5 g ÷ 122.5g/mol

mole = 0.502mol

Since 2 moles of KClO3 will decompose to produce 2 moles of KCl.

0.502 mol of KClO3 will decompose to produce 0.502 × 2/2

= 0.502mol of KCl.

Answer:

224.5J

Explanation:

Using the formula as follows:

Q = m × c × ∆T

Where;

Q = amount of heat (J)

m = mass of substance (g)

c = specific heat capacity.

∆T = change in temperature (°C)

According to this question;

m = 20g

∆T = 75°C - 50°C = 25°C

Q = ?

c of iron = 0.449 J/g°C

Using Q = m × c × ∆T

Q = 20 × 0.449 × 25

Q = 224.5J

Answer:

T2 = 547.2K

Explanation:

Given:

V1 = 135 ml. V2 = 250 ml

T1 = 295.5K. T2 = ?

Using Charles's law and solving for T2,

V1/T1 = V2/T2

T2 = (V2/V1)T1

= (250 ml/135 ml)(295.5K)

= 547.2K (or 273.2°C)

Answer:please see explanation for answers

Explanation:

Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.

Now, some of the ways we can conserve water include

1. Putting off taps while lathering the hands with soap

2.use of irrigation system to water crops and plants

3.. while brushing, make sure to turn off the tap or faucet

4. use a shower rather than a bath

Answer:

Arrow B

Explanation:

Explanation:

hope it is helpful to you ☺️

Answer:

Deduce the balanced chemical equation:

CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)

2. Write as ionic species:

Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)

3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):

CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)

This is the balanced ionic equation.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

[tex]n = \frac{1.204 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.02[/tex]

We have the final answer as

Hope this helps you

Answer:

0.28M H2SO4

Explanation:

The molarity of a solution is defined as the ratio between the moles of the solute (In this case, H2SO4) and its volume in liters.

In the problem, the volume of the solution is increased from 125mL to 250mL. That means the solution is diluted:

250mL / 125mL = 2 times.

As the solution is diluted 2 times, the concentration is decreased in 2, that is:

0.56M / 2 =

Answer:

n=4

Explanation:

n= (154.75×28.40)÷(68.45×18)

n=3.5

n=4(approximately)

Answer: There are [tex]40.41 \times 10^{23}[/tex] molecules present in 6.71 moles of [tex]NH_{3}[/tex].

Explanation:

Given: Moles of [tex]NH_{3}[/tex] = 6.71 mol

According to the mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{22}[/tex] molecules.

Therefore, molecules present in 6.71 moles are calculated as follows.

[tex]Molecules = moles \times 6.022 \times 10^{23}\\= 6.71 \times 6.022 \times 10^{23}\\= 40.41 \times 10^{23}[/tex]

Thus, we can conclude that there are [tex]40.41 \times 10^{23}[/tex] molecules present in 6.71 moles of [tex]NH_{3}[/tex].

Answer:

im not sure

Explanation: