A researcher selects three regions X, Y, and Z, and records the types of discharge that enter the regions’ rivers.

Which region(s) should be monitored more closely to avoid potential health issues?

Answer:

Ammonia is a chemical compound used as a fertilizer because it is rich in nitrogen. Its chemical formula is NH3, which means that it consists of one atom of nitrogen and three atoms of hydrogen per molecule.

A chemical formula is a symbolic representation of a chemical compound. It tells us about the number of atoms present in the compound. The chemical formula of ammonia is NH₃.

An inorganic compound which is composed of nitrogen and hydrogen with the formula NH₃ is called the ammonia. It is a colourless gas with pungent smell. It is lighter than air and it can be easily liquified due to the strong hydrogen bonding between the molecules.

In ammonia there are 3 bond pairs and one lone pair around the central nitrogen atom. According to VSEPR theory, these tend to stay as far apart as possible to minimize mutual repulsion. Hence they arrange themselves in tetrahedral manner.

However due to the lone pair of electrons, the actual geometry of the molecule is trigonal pyramidal. One of the most important feature of ammonia is that it is a weak base.

Thus the chemical formula of ammonia is NH₃.

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Answer:

B is the correct answer

Answer:

they do not separate to form lumps of sodium metal or to form chlorine gas.

Explanation:

While it's true that when a crystal of the ionic substance sodium chloride is dissolved in water the sodium and chloride ions separate from one another, they do not separate to form lumps of sodium metal or to form chlorine gas. Rather, they remain as single Na+ and Cl− ions, surrounded by water molecules

Explanation:

C6H10

12(6) + 1(10)

= 72 + 10 = 82

The relative molecular  mass of the alkyne with 6 carbon atoms is 82 gram/mole.

Molecular  mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molar mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.Relative molecular masses are also calculated by the same method.

In case of an alkyne with formula C₆H₁₀ relative molecular mass is calculated as, 12×6 +1×10=82 g/mole.

Hence, the relative  molecular mass of an  alkyne with 6 carbon atoms is 82 g/mole.

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Answer:

Gas molecules move at random with no attractive forces between them.

Explanation:

Kinetic-molecular theory is based on the following postulates, or assumptions.

Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.

These particles move in a straight line until they collide with another particle or the walls of the container.

These particles are much smaller than the distance between particles. Most of the volume of a gas is therefore empty space.

There is no force of attraction between gas particles or between the particles and the walls of the container.

Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.

The average kinetic energy of a collection of gas particles depends on the temperature of the gas and nothing else.

Answer: 0.027 moles

Explanation:

The three (3) examples from the sword fighting scene that showed Inigo and the masked man's similarities are:

Inigo Montoya was one of the fictional character in the novel titled "The Princess Bride" and written by William Goldman's in 1973. Inigo hails from the village called Arabella and he was raised by his father Domingo Montoya, who was a master craftsman that makes sword.

In The Princess Bride, Inigo had a swordfight with a man in black (masked man) and they have the following things in common:

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The time taken for the same volume of methane gas to diffuse is 7.1 s.

The rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.

[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }[/tex]

where;

[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s[/tex]

Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.

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The time it takes for hydrogen to diffuse is 7.07 seconds

To calculate the time it will take hydrogen gas to diffuse, we use the formula from Graham's law of diffusion.

Formula:

Where:

Make T the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The time it takes for hydrogen to diffuse is 7.07 seconds.

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Answer:

to detect equivalence point.

Explanation:

the point at which chemically equivalent amounts of reactants have been mixed.

Answer:

the first is unbalanced

because the number of hydrogen are not equal on both sides

the second one is balanced

because the number of nitrogen and hydrogen atoms are equal on both sides

and the third one seems to be incomplete

Answer:

both are humans

Explanation:

so what on earth are you talking about?

Answer:

Do you mean why animals are better to send to space than humans? Animals do not comprehend what is going on so they are not worried or scared to die in space. They also do not have the same level of IQ as humans so humans are worth more if you saw it from that point of view. I know this can be debated however.

\\

Ok I see you posted a comment saying "Robots"

Robots will not die if there is an explosion because AI does not have a mind of it's own.

Answer:

Thermochemistry

Explanation:

Thermochemistry is the area of study in chemistry that is concerned with the heat transfers that occur during chemical reactions.

Hope this helps.

Explanation:

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Answer:

CO2(C)

Explanation:

This is because there is a mutual sharing of electrons between the atoms or elements...That's to say covalent bond exist between them.

Answer:

D

Explanation:

I took the test ^^

Answer: the answer is D. The subduction of oceanic crust helps drive convection currents inthe mantle.

Explanation:

The partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium is mathematically given as

Question Parameter(s):

Generally, the equation for the Chemical Reaction  is mathematically given as

HCl(g) ⇌ NH₄Cl(s)

Therefore

[tex]Keq=\frac{1}{PH3*PHC}[/tex]

PH3*PHCl=1.23*10^16

Therefore

P^2=1.23*10^{-16}

P=1.06*10^{-8}

In conclusion,

PH3=1.06*10^{-8}atm

PHCl=1.06*10^{-8}atm

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option b mg2 magnesium dissove in water

Answer:

#1: The law of conservation of mass underpins the principles of stoichiometry. Because matter cannot be generated or destroyed, the mass of each element present in a chemical reaction's product(s) must be equal to the mass of each element present in the reactant (s).

#2: 3molH2:2molNH3

Explanation:

Question 1:

Question 2:

Badrd on the graph provided, it can be concluded that:;

Human activities have on the most part affected wildlife negatively.

Humans activities such as construction of dams across rivers have being demonstrated to negative affect the habitat and hence the population of aquatic organisms in the area.

The data shown on the graph shows a steep decrease in the population of the striped bass after the construction of the dam in 1958.

Therefore, it can be concluded that the population of the striped bass has been on a steady decline since 1958.

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Any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material. This is a true statement.

Natural materials are the physical matters that are made from plants, animals and ground(environment) which has not been subjected to any chemical processes for modification.

But any natural material that has undergone any chemical process which has been designed and manufactured to fulfil a particular purpose is called a synthetic material.

Therefore, any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material.

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Answer:

The term poly implies many, so a polyatomic particle is a particle that contains more than one atom. Hence it is not the same as monatomic particles, which contain just a single iota. Instances of monatomic particles incorporate Na+ and Cl-

Answer:

The ions which contain more than one atoms behaving as a single unit are called polyatomic ions. For example, PO43−,CO32−

Explanation:

Answer:

docx it is a science document

The amount, in grams, of potassium that would be needed to produce 23.5 grams of potassium oxide will be 19.5 grams

From the equation, the mole ratio of K to K2O is 2:1.

Mole of 23.5 K2O = mass/molar mass

Molar mass of K2O = 39x2 + 16 = 94

Mole of 23.5 K2O = 23.5/94 = 0.25 moles

Equivalent mole of K = 0.25 x 2 = 0.5 moles

Mass of 0.5 mole K = 0.5 x 39 = 19.5 grams

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Answer: Calculating mass quick check

1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.

2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.

3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g

4. 19.5 g

5. 853.5 g

You're welcome

Answer:

Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form.

SO the answer is- D. All of the above

Explanation:

Answer:

A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly

12 grams of carbon-12 (i.e., 6.023 X 1023).

Explanation:

Answer:

Adult musk oxen in a herd surround their young to protect them from wolves.

Answer:

D

Explanation:

Answer:

C

Explanation:

I believe it is C but don't take my advice 100%.

[tex]\\ \rm\rightarrowtail 2HCl+CaCO_3\longrightarrow CaCl_2+H_2O+CO_2[/tex]

On both sides

Hence balanced

Answer:

Propane burns in air according to the following equation:

C

3

H

8

+5O

2

→3CO

2

+4H

2

O.

1 mole of propane combines with 5 moles of oxygen.

Volume is directly proportional to the number of moles.

1 cm

3

of propane will combine with 5 cm

3

of oxygen.

Only 20% of air contains oxygen. So 1000 cm

3

of air contains 1000cm

3

×

100

20

=200cm

3

of oxygen.

The volume of propane that is consumed on using 1000 cm

3

of air is

5

200cm

3

=40cm

3

.

Reaction

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Avogadro: at the same T and P, the ratio of gas volume = the ratio of gas moles  

volume of CO₂ = 3/1 x 25 = 75 m³