What is the definition of a community in environmental science

Answer:

Explanation:

For the answer to the question above,

Addition of HCl causes a precipitate to form:

Ag+ & Cl- -- AgCl a white ppt

H2SO4 is added to the supernate another precipitate forms:

Ba+2 & SO4-2 --> BaSO4 a white ppt

a solution of NaOH is added to the supernatant liquid until it is strongly alkaline. No precipitate is formed:

no Mn+2 & no Cu+2 which would have ppt as hydroxides

I hope this helps you.

Explanation:

taking a special juice independent variable

the number of stuck of paper dependent variable

the control group is group B

experimental group is Group A

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Answer:

4 Chlorine atons

Explanation:

4 molecules of NaCl

In NaCl we have only 1 atom of Cl

Therefore in 4 molecules, we have 4 atoms of Cl.

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There are a total of 4 chlorine atoms in 4 NaCl.

ATOMS:

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Answer:

Nucleus and atoms have no overall charge because each element has the same number of protons and electrons which cancel out each other.

In both cases of water boiling on a stove and water vapor condensing on a bathroom mirror, the water remains chemically the same; only its physical state changes.

Boiling occurs when water reaches its boiling point, which is the temperature at which its vapor pressure equals atmospheric pressure. This causes the water to rapidly convert from a liquid to a gas, releasing steam.

Water vapor condenses on a bathroom mirror when the water vapor in the air comes into contact with the cooler surface of the mirror. The cooling effect of the mirror causes the water vapor to lose energy, which causes the water molecules to come together and form droplets.

This causes the water to rapidly convert from a gas to a liquid, creating condensation. In both cases, the changes in the water's physical state are due to changes in the temperature and pressure of the environment.

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Answer:

The volume of ozone produced is 7.53 L.

Explanation:

The reaction is:

3O₂(g)  →  2O₃(g)   (1)      

0.477 mol   V=?

11.3 L    

From the reaction (1) we have that 3 moles of O₂ produce 2 moles of O₃ so the volume of the ozone produced can be calculated as follows:

\( V_{O_{3}} = V_{O_{2}}*\frac{n_{O_{3}}}{n_{O_{2}}} = 11.3 L*\frac{2}{3} = 7.53 L \)

Therefore, the volume of ozone produced is 7.53 L.

I hope it helps you!

The ozone volume (in liters) is 7.53 L.

The volume of the ozone in liters should be

\(= 11.3 \times 2\div 3\)

= 7.53L

we have that 3 moles of O₂ produce 2 moles of O₃

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C. the denser the plants the better.

Answer:

C

Answer: Plants with higher density of the bacteria on their roots have increased rates of survival reproduction

Explanation:

The mass of 0.5 mole of the element is approximately 6.025 grams.

To calculate the mass of 0.5 mole of the element, we need to know the molar mass of the element.

Given that the mass of 2 x 10^21 atoms of the element is 0.4 grams, we can use this information to find the molar mass.

The number of atoms in 1 mole of any substance is given by Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.

First, we calculate the molar mass of the element using the given information:

Molar mass = Mass of 2 x 10^21 atoms / Number of moles of 2 x 10^21 atoms

Molar mass = 0.4 g / (2 x 10^21 atoms / (6.022 x 10^23 atoms/mol))

Molar mass ≈ 0.4 g / (3.32 x 10^-2 mol)

Molar mass ≈ 12.05 g/mol

Now that we know the molar mass of the element is approximately 12.05 g/mol, we can calculate the mass of 0.5 mole of the element:

Mass = Molar mass x Number of moles

Mass = 12.05 g/mol x 0.5 mol

Mass = 6.025 grams

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Answer:

347.4 (19.3 mole)

Explanation:

CH4 + 2O2 = CO2 + 2H2O

1(mole) - 9.65(mole)

2(mole) - x ⇒x = 9.65*2=19.3

m=n*M ⇒ m= 19.3*(1*2+16)= 19.3*18=347.4(g)

Answer:

evaporation

Explanation:

When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Heat from the sun, or solar energy, powers the evaporation process.

To be considered a true hydrate, a compound must follow a few rules, and one of these rules is the color being the same before and after heating. In this case we have a difference in the color, the residue after heating when dissolved in water is forming a yellow brown solution, and in the meanwhile, a colorless solution is formed when a sample of the original compound is dissolved in water, which is not a characteristic of a true hydrate.

Answer:

I think it's False

Explanation:

Explanation:

The amount of water in, on, and above our planet does not increase or decrease because of the water cycle

So it's false

The sp3 hybridization allows these molecules to have a tetrahedral shape with a bond angle of approximately 109.5 degrees.

The orbital hybridization of a central atom that has two lone pairs and bonds to three other atoms is sp3. This is because the central atom requires four orbitals to accommodate the two lone pairs and

the three bonds. The hybridization process involves the mixing of the s and p orbitals to form four hybrid orbitals, which are then arranged in a tetrahedral geometry around the central atom.

The lone pairs occupy two of the hybrid orbitals, while the remaining three hybrid orbitals bond with the three other atoms. This type of hybridization is commonly observed in molecules such as ammonia (NH3) and water (H2O), where the central atom has two lone pairs and bonds to three other atoms.

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Answer:

0.03 mol

Explanation:

The equation relating the number of moles and number of atoms is:

Number of atoms = number of moles × 6.02 × 10²³

[6.02 × 10²³ is the Avogadro's constant and is the number of particles in 1 mole of any substance.]

By rearranging the equation, we can find the number of moles of calcium.

Number of moles = (3.01 × 10²²) ÷ (6.02 × 10²³)

Number of moles = 0.05 moles of calcium

Now the only data we know about these two elements are their Mr values, so we are going to find the number of moles of magnesium using ratio.

    Moles : Mr

0.05 mol : 40.1

           x  : 24.3

[we are going to assume that x is the number of moles of magnesium that we have to find out.]

Cross multiply the ratios.

40.1x = 0.05 × 24.3

x = 1.215 ÷ 40.1 = 0.03 mol

Oki

so heres the formula:

\(2 {2.(0 \frac{ \frac{5 \frac{ \leqslant { {3 {2 { { \frac{5}{?} }^{2} }^{2} }^{2} }^{?} }^{?} }{?} }{?} }{?} }^{2} \)

Answer:

the number of atoms stays the same as the atoms lose energy to the colder freezer, slow down, get closer together, shrinking the volume

Explanation:

When a liquid is cooled, the average energy of the molecules decreases. At some point, the amount of heat removed is great enough that the attractive forces between molecules draw the molecules close together, and the liquid freezes to a solid.

I hope it helps.

Answer:

D) Temperature,

Explanation:

The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.

Given:

Mass of H2O2 solution = 1.0 g

Concentration of H2O2 solution = 30 wt% (weight percent)

Volume of KMnO4 solution used = 22.143 mL

Molar mass of H2O2 = 34.01 g/mol

Step 1: Calculate the moles of H2O2 in the solution.

Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)

= 1.0 g / 34.01 g/mol

= 0.0294 mol

Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.

According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.

Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)

= 0.0294 mol * (2/5)

= 0.01176 mol

Step 3: Calculate the molarity of the KMnO4 solution.

Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)

= 0.01176 mol / 0.022143 L

= 0.5316 M

Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

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Answer:

\({ \rm{5CaC _{2}O _{4(aq)}+ 2KMnO _{4(aq)} + 8H _{2} SO _{4(aq)} → 5CaSO _{4(s)}+ 2Mn SO _{4(aq)}+ K _{2} SO _{4(s)} + 10CO _{2(g)} + 8H _{2} O _{l} }}\)

Explanation:

This is a redox reaction formed by combining two half equations.

Check the image above, sorry if my handwriting is poor :(

Answer:

Yes.

Explanation:

Electric charge cannot change the elemental composition of a substance.

The application of charge to the aluminium foil does not change the composition of the foil and hence the foil will still be made up of aluminium atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

A is the answer

Explanation:

Just guessing.

Answer: T = 9.74°C

Explanation: An ideal gas in a quasi-static adiabatic process follows the equation: \(pV^{\gamma} = constant\).

So:

\(1.10^{1.67} = constant\)

constant = 46.7735

Adiabatic conditions can be written as:

\(TV^{\gamma-1}=constant\)

Then, new temperature is

\(T.(10.4)^{1.67-1}=46.7735\)

\(T.(10.4)^{0.67}=46.7735\)

\(T = \frac{46.7735}{4.802}\)

T = 9.74°C

The new temperature is 9.74°C.

The titration curve is nearly flat at the end of the titration because adding more titrant to the solution doesn't cause a significant change in the pH.

The titration curve shows the change in pH as the titrant is added to the solution. At the equivalence point, the number of moles of the titrant added is equal to the number of moles of the analyte present in the solution. After the equivalence point, adding more titrant to the solution does not significantly change the pH because the solution has reached its buffering capacity.

At this point, the solution contains an excess of the titrant, and the pH is determined by the acid or base used as the titrant. The buffering capacity of the solution depends on the concentration and strength of the buffer components present in the solution. Therefore, the flat portion of the titration curve is due to the buffering capacity of the solution and indicates that the titration is complete.

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Grams of SrCl2 required to make 250 ml of a 0.100 srcl2 aqueous solution is 6.76 g.

We start by calculating the number of moles of SrCl2 in 558 mL of a 0.100 M solution.

0.025 mol SrCl2 per 1 liter (mol SrCl2=0.250 0.1 mol)

We can convert the above amount from moles to grams using the molar mass of SrCl2.

0.025 mol SrCl2 158.53 g1 mol

SrCl2 = 3.96 g SrCl2

MW SrCl2 = 158.53 gmol

The resulting bulk is made up entirely of solute. We calculate the mass of solid mixture required as given, assuming that the sample of SrCl2 we have is 58.6% by weight.

Mass of the solid mixture = mass of the solute/mass% ×100,

=3.96g / 58.6 ×100,

=6.76 g SrCl2.

Thus, we require 6.76 g of a solid SrCl2 mixture that is 58.6% Sr by weight.

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I hope this helped! +*♡

The given equilibrium data is as follows:

X = 0, 0.055, 0.111, 0.208, 0.284, 0.371, 0,472, 0,530, 0,592, 0,733, 0,814, 0,903, 1Y = 0, 0,224, 0,395, 0,596, 0,700, 0,784, 0,853, 0,882, 0,908, 0,951, 0,970, 0,986,

Hence, mole fraction of benzoic acid in the vapor = 1 – xThe initial composition of the mixture is:

mole fraction of benzoic acid in the vapor = 1 – x1 = 0.405mol/moliii) Mole fraction of vapor is given as 0.75. Therefore, mole fraction of liquid is (1 - 0.75) = 0.25.Let x2 be the mole fraction of maleic anhydride in the vapor. Hence, mole fraction of benzoic acid in the vapor = 1 – x2Using the equilibrium data, the mole fraction of maleic anhydride in the liquid phase can be obtained.

Benzoic acid, C₇H₆O₂, is a white crystalline solid and is the simplest aromatic carboxylic acid. The name of this acid comes from the gum benzoin, which was formerly the only source of benzoic acid. This weak acid and its derivative salts are used as food preservatives.

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