Plants need sunlight, water, and minerals from the soil in order to grow and thrive. These factors
A.
are always abundant, allowing unlimited growth.
B.
limit the number of plant populations that can grow in an ecosystem.
C.
require human intervention to be replenished.
D.
prevent new plant populations from entering the ecosystem.

Answer:

Heat required = 84.25 Joule

Explanation:

Heat required = mass × specific heat capacity × temperature change

Specific heat capacity of aluminium = 0.90 J/g/K

Heat required = 2.3 × 0.9 × (46.9 -6.2)

= 84.25 Joules

Answer:

I dm u on Instagram

Explanation:

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According to molar concentration, 3 moles are  needed to be dissolved in 1 dm³ to get a 3 M solution,and 0.3 moles would be needed if only 0.1 dm³were used.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substituting the values in given  formula, number of moles=molar concentration×volume in liters=3×1=3 moles and for 0.1 dm³ it is 3×0.1=0.3 dm³.

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Answer:

The equation for the Kinetic Energy, [tex]KE_e[/tex], of the photo-emitted electrons is given as follows;

[tex]KE_e = h\cdot f- BE[/tex]

Please find attached the required plot of the kinetic energy versus the frequency

Explanation:

The equation for the Kinetic Energy, [tex]KE_e[/tex], of the photo-emitted electrons is given as follows;

[tex]KE_e = h\cdot f- BE[/tex]

Where:

h = Planck's constant = 6.63×10⁻³⁴ J·s

f = Frequency

BE = Binding Energy = 2.71 eV  for Calcium metal

f₀ = Threshold frequency for the material

The ionization energy is the energy required to free an electron from an isolated atom

Answer:

-376 kJ.

Explanation:

Answer:

Explanation:

Use one of your experimentally determined values of k, the activation energy you determined, and the Arrhenius equation to calculate the value of the rate constant at 25 °C. Alternatively, you can simply extrapolate the straight line plot of ln(k) vs. 1/T in your notebook to 1/298 , read off the value of ln(k), and determine the value of k. Please put your answer in scientific notation. slope=-12070, Ea=100kJ/mol, k= 0.000717(45C), 0.00284(55C), 0.00492(65C), 0.0165(75C), 0.0396(85C)

Explanation;

According to Arrhenius equation:

i.e. ln(k2/k1) = -Ea/R (1/T2 - 1/T1)

Where, k1 = 0.000717, T1 = 45 oC = (45+273) K = 318 K

T2 = 25 oC = (25 + 273) K = 298 K

i.e. ln(k2/0.000717) = -12070 (1/298 - 1/318)

i.e. ln(k2/0.000717) = -2.54738

i.e. k2/0.000717 = [tex]e^{-2.54738}[/tex]

= 0.078286

Therefore, the required constant (k2) = 0.078286 * 0.000717 = [tex]5.61*10^-^5[/tex]

Answer:

Liquids

Note: the attachment below shows the properly arranged chart

Explanation:

The order of molecular motion of matter from fastest to slowest is;

Plasma>Gases>Liquids>Solids

Liquids move faster than solids not slower.

Answer:

liguids

Explanation:

Answer: Thus the volume of the balloon at this altitude is 419 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 751 mm Hg

[tex]P_2[/tex] = final pressure of gas = 495 mm Hg

[tex]V_1[/tex] = initial volume of gas = 340 L

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]30^oC=273+30=303K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]-27^oC=273-27=246K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{751\times 340}{303}=\frac{495\times V_2}{246}[/tex]

[tex]V_2=419L[/tex]

Thus the volume of the balloon at this altitude is 419 L

Answer:

The purpose of respiration is to supply the body with oxygen and eliminate carbon dioxide. Oxygen is essential for cellular respiration as cells cannot exist in the absence of it. The human lungs are the organs responsible for respiration.

Explanation:

Respiration refers to a person’s breathing and the movement of air into and out of the lungs. The respiratory system provides oxygen to body tissues for cellular respiration, removes the waste product carbon dioxide, and helps maintain acid–base balance. Inspiration is the process that causes air to enter the lungs, and expiration is the process that causes air to leave the lungs . A respiratory cycle (or one breath while you are measuring respiratory rate) is one sequence of inspiration and expiration.

Answer:

Not really, the chances you will get hurt are insignificant

Explanation:

Answer:

2,4–dimethylhexane.

Explanation:

To name the above compound, we must do the following:

1. Locate the longest continuous carbon chain. This gives the parent name. In this case, the longest chain is carbon 6 i.e Hexane.

2. Identify and Locate the position of the substituent group attached. In this case, the substituent group attached is methyl i.e CH3 and it is at carbon 2 and 4.

3. Combine the above to get the name.

Therefore, the name of the compound is:

2,4–dimethylhexane.

Answer:

2 MOLECULES OF WATER

Explanation:

SO, LIQUID

Answer:

52

I personally don't know how to do this but this is what I was told the answer is

There are 22 atoms in calcium phosphate with chemical formula  4 Ca₃(PO₄)₂ .

To determine the number of atoms in a chemical formula, one need to multiply the number of atoms for each element by the corresponding subscript and then sum them up.

In the given chemical formula, 4 Ca₃(PO₄)₂, :

- 4 is the coefficient in front, indicating that the entire compound is multiplied by 4.

- Ca represents calcium, and the subscript 3 indicates there are 3 calcium atoms.

- (PO₄)₂ represents a group called a phosphate group. Within the phosphate group, we have 1 phosphorus atom (P) and 4 oxygen atoms (O). The subscript 2 outside the parentheses indicates that the entire phosphate group is multiplied by 2.

To calculate the total number of atoms, we multiply the coefficients by the subscripts and sum them up:for calcium (Ca):

3 calcium atoms × 4  = 12 calcium atoms

For phosphate:

1 phosphorus atom ×2  = 2 phosphorus atoms

4 oxygen atoms ×2 = 8 oxygen atoms

Adding up the totals:

12 calcium atoms + 2 phosphorus atoms + 8 oxygen atoms = 22 atoms

Therefore, there are 22 atoms in 4 Ca₃(PO₄)₂.

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Answer:

The balanced chemical equation will be "[tex]NO_{2}+O\rightarrow NO+O_{2}[/tex]".

Explanation:

The given equation is:

[tex]2NO_{2}\rightarrow 2NO+O_{2}[/tex]

Step 1:

[tex]2NO_{2}\rightarrow NO+O[/tex]...(equation 1)

Step 2:

[tex]NO_{2}+O\rightarrow NO+O_{2}[/tex]...(equation 2)

On adding "equation 1" and "equation 2", we get

⇒  [tex]NO_{2}+NO_{2}+O\rightarrow NO+O+NO+O_{2}[/tex]

⇒  [tex]2NO_{2}\rightarrow 2NO+O_{2}[/tex]

The second step:

⇒  [tex]NO_{2}+O\rightarrow NO+O_{2}[/tex]

Answer:

C. The use of coal

Explanation:

Answer:

C. The use of coal

Explanation:

Edge 2021

Answer:

D. All the above

Explanation:

WHite people are "previlged"

Answer:

a)the ionic radius of phosphorus

Explanation:

phosphorus=2.8.6

for phosphorus to become stable(2.8.8) it gains two electrons thus the ionic radious increases bcz of the gained electrons

Answer:

33 g of H2

Explanation:

N2 + 3 H2 -> 2 NH3

3 mol H2 -> 2 mol NH3

             x -> 11 mol NH3

x= (11 mol NH3 * 3 mol H2)/ 2 mol NH3

x= 16.5 mol H2

1 mol H2    -> 2 g

16.5 mol H2 ->x

x= (16.5 mol H2 * 2 g)/ 1 mol H2

x= 33 g

Answer:

Image and text

Explanation:

on edge

Answer:

did you mean moles? If so, answer is down below.

Explanation:

there are 0.106 moles of glucose in 19.1 g of glucose.

Answer:

Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (the currency of energy in cells)

Explanation:

Answer:

A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model.A pH of 7 indicates a neutral solution like water. A pH less than 7 indicates an acidic solution and a pH greater than 7 indicates a basic solution. Ultimately, the pH value indicates how much H+ has dissociated from molecules within a solution. The lower the pH value, the higher concentration of H+ ions in the solution and the stronger the acid. Likewise, the higher the pH value, the lower the concentration of H+ ions in the solution and the weaker the acid.

Explanation:

Answer: In the Western United States and Canada, open range is rangeland where cattle roam freely regardless of land ownership. ... Land in open range that is designated as part of a "herd district" reverses liabilities, requiring an animal's owner to fence it in or otherwise keep it on the person's own property.

Explanation: Mark me as brainliest

Answer:

B. The strong adhesion to other substances

Explanation:

hope this helps!

Answer:

E. The strong cohesion between water molecules

Explanation:

Water is a very special molecule because of its hydrogen bonds. And, because of these hydrogen bonds, water has many properties that make it unique compared to other substances.

One such property is that it is cohesive, which means water molecules are attracted to each other. This is due to the polar bonds and hydrogen bonds that water molecules have. Because of the polar and hydrogen bonds, the molecules attract each other and stick together, creating that bead-like phenomenon that the student sees on the table.

Thus, the answer is E.

Answer:

1.5M

Explanation:

M1V1=M2V2

(0.75M)(100ml)=(M2)(50 ml)

M2= 1.5 M

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Answer:

2 with 1 SF

Explanation:

Answer:

Zn(s) + CuSO4(aq) -----> ZnSO4(aq) + Cu(s)

Na2CO3 (aq)+ 2AgClO4(aq) → 2NaClO4(aq) + Ag2CO3(s)

2Al(s) + 6HI(aq) ------> 2AlI3(aq) + 3H2(g)

C12H22O11(s)+H2O(l)→4C2H5OH(aq)+4CO2(g)

2K(s) + 2H2O(l) ------->2KOH(aq) + H2(g)

Explanation:

In the first reaction, zinc displaces copper from an aqueous copper II salt since zinc is higher than copper in the electrochemical series.

Reaction two leads to the precipitation of silver carbonate. Remember that carbonates are mostly insoluble in water.

Acids are known to displace hydrogen gas from dilute acids. Hence in the third reaction, aluminum displaced hydrogen from aqueous hydroiodic acid.

In the fourth reaction, the action of yeast leads to the fermentation of sucrose yielding ethanol and carbon dioxide in the process.

Metals are known to form aqueous alkaline solutions liberating hydrogen gas when they react with water. Hence potassium metal reacts with water to liberate hydrogen gas and form alkaline potassium hydroxide.

Answer:

They add carbon Dioxide into the air warming the atmosphere which adds to the greenhouse effect, Making the temperature higher