What factors affect water quality?In a typical drinking-water treatment process, ____________________ is when air is forced through the water to reduce unpleasant odors and taste.

Answer:

[tex]29 g. NaCl[/tex]

Explanation:

we know that it's molar mass is [tex]58 \frac{g}{mol}[/tex]

This means that 1 mol of sodium chloride contains 58g of sodium chloride; now How many grams of [tex]NaCl[/tex] are in 0.5 moles?

[tex]1 mol \longrightarrow 58g\\ 0.5 mol\longrightarrow x\\ x=\frac{0.5mol.58g}{1mol}=29g[/tex]

In 0.5 mol of NaCl there will be 29 g of sodium chloride

Answer: Polar covalent

Explanation:

Answer:

Particles that struck the center of the atom were repelled.

Explanation:

In 1911, New Zealand physicist Ernest Rutherford carried out an experiment in order to deepen his knowledge of the atomic model hitherto adopted, which was that of Thomson; in which the atom would be a sphere of positive, non-massive electrical charge, encrusted with (negative) electrons, so that its total electrical charge would be zero.

To carry out such an experiment he bombed a very thin gold leaf (thickness of approximately 10-4 mm), through a beam of alpha particles (α), coming from a sample of polonium. The polonium was inside a lead block, with an orifice, through which only the emissions of alpha particles would be allowed out.

In addition, lead plates with holes were placed in their centers, which would orient the beam towards the gold blade. And, finally, a bulkhead covered with zinc sulfide, which is a fluorescent substance, was placed behind the slide, where it was possible to visualize the path taken by the alpha particles.

At the end of this experiment, Rutherford noticed that most of the alpha particles passed through the slide, did not deflect or retreat. Some alpha particles deflected, and very few receded. In addition, the particles that reached the center of the atom were repelled.

Based on these data, Rutherford concluded that, contrary to what Dalton thought, the atom could not be massive. But in reality, much of the atom would be empty and it would contain a very small, dense and positive nucleus.

The Alkali metals includes

The alkali metals are the metal which react with water forms alkalies that is strong bases capable of neutralizing acids.

The alkali metals have the high thermal and electrical conductivity, lustre, ductility, and malleability all are the characteristic of metals. Each alkali metal atom contains a single electron in its outermost shell. This valence electron is much more weakly bound than those in inner shells.

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A 760 nm photon has less energy than a 620 nm photon because energy and wavelength of photons are inversely related. Longer wavelengths signify lower energy, so a 760 nm photon has less energy.

Compared to a 620 nm photon, a 760 nm photon has lesser energy. This is because energy and wavelength of photons are inversely related, and thus, a longer wavelength (760 nm) signifies lower energy. Wavelength and energy are related by the equation E=hc/λ, where E is energy, h is Planck's constant, c is the speed of light, and λ is the wavelength. If the λ value increases, the E value decreases, assuming the values of h and c remain constant.

For example, a red photon (longer wavelength around 700 nm) carries less energy compared to a blue photon (shorter wavelength around 420 nm). This concept also applies to other types of electromagnetic radiation such as UV or infrared light, going beyond the visible light spectrum (380 to 720 nm). In essence, the longer the wavelength, the less energy the photon has, which is why a 760 nm photon has less energy than a 620 nm.

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Answer: The configuration of lithium element is [tex]1s^22s^12p^03s^03p^04s^03d^04p^05s^0[/tex]

Explanation:

Electronic configuration is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom is determined by the atomic number of that atom.

We are given:

Atomic number = 3

The element having atomic number '3' is lithium

The electronic configuration of lithium element is [tex]1s^22s^1[/tex]

Hence, the configuration of lithium element is [tex]1s^22s^12p^03s^03p^04s^03d^04p^05s^0[/tex]

Answer: C) 330 g

Explanation: Since all the masses are given in different units, it's good to make all of them to have same unit. Let's say we convert all of them to grams.

A) kg stands for kilogram and 1 kg = 1000 g

So, [tex]0.033kg(\frac{1000g}{1kg})[/tex]

= 33 g

B) hg stands for hactogram and 1 hg = 100 g

So, [tex]0.33hg(\frac{100g}{1hg})[/tex]

= 33 g

C) 330 g

D) cg stands for centigram and 1 cg = 0.01 g

So, [tex]3300cg(\frac{0.01g}{1cg})[/tex]

= 33 g

Looking at all the choices, choice A, B and D represent equal amount of matter that is 33 g where as choice C represents 330 g of matter.

Hence, the correct choice is C) 330 g.

The work done in the chemical reaction is 3.20 J.

The work done in a chemical reaction can be calculated using the formula:

Work (W) = -P ∆V

Where P is the pressure and ∆V is the change in volume. In this case, the volume decreases from 5.00 to 1.26 L against a constant pressure of 0.857 atm. To calculate the work, we need to calculate the change in volume:

∆V = Vfinal - Vinitial = 1.26 L - 5.00 L = -3.74 L

Substituting the values into the formula, we have:

Work (W) = -P ∆V = -(0.857 atm) (-3.74 L) = 3.20 J

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The work done in the chemical reaction can be calculated using the formula W = P∆V, which gives the result as 292.1 Joules.

Work done, especially in a process involving a gas, can be calculated when the pressure is constant and the volume changes. This is often referred to as pressure-volume work. In this particular case, we are given a process in a chemical reaction where the volume decreases from 5.00 to 1.26 L (a decrease of 3.74 L or 3.74 x 10^-3 m^3) against a constant pressure of 0.857 atm (which equals 0.857 x 1.01325 x 10^5 N/m^2). The formula to calculate work done is W = P∆V.

Inserting the given values into the formula, W = 0.857 x 1.01325 x 10^5 N/m^2 x 3.74 x 10^-3 m^3 which equals approximately 292.1 J (joules). Therefore the work involved in the chemical reaction is 292.1 J.

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Answer:

The correct answer from the given options is option 1.2 L.

Explanation:

Volume of the gases when 0.65 moles of gas are present = [tex]V_1=750 mL=0.750 L[/tex]

Volume of the gas when there 0.35 moles of gas are added= [tex]V_2[/tex]

[tex]n_1=0.65 moles,n_2=0.65+0.35 moles=0.10 moles[/tex]

According Avogadro law of gases:

[tex]\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]

[tex]V_2=\frac{V_1\times n_2}{n_1}=1.15 L[/tex]

The closest answer from the given options is option 1.2 L.

From the explanation, we are given that:

The volume of gas it occupies when [tex]0.35moles[/tex]  = [tex]{V_2}[/tex] (unknown)

Therefore we have:

[tex]{n_2}[/tex] = [tex]0.65[/tex]  + [tex]0.35[/tex]  = [tex]0.10moles[/tex]  , [tex]{n_1}[/tex] = [tex]0.65moles[/tex]

To solve this question, we have to consider the Avogadro’s law, which state that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules”

The law can be expressed as:

[tex]\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]

[tex]V_2=\frac{V_1\times n_2}{n_1}[/tex]

[tex]V_2=\frac{0.750\times 0.10}{0.65}[/tex] = [tex]1.15L[/tex]

[tex]1.2L[/tex]

Therefore, the correct answer is 1.2L

LEARN MORE:

KEYWORDS:

Explanation:

A subscript is a number that is placed below an alphabet on the bottom right side.

For example, for [tex]H_{2}[/tex] molecule 2 is the subscript.

A subscript indicates the number of atoms present in a substance or molecule.

For example, in [tex]H_{2}SO_{4}[/tex] the subscripts indicate that there are two hydrogen atoms, one sulfur atom, and four oxygen atoms.

The two methods used to balance a chemical equation are :

(a) Inspection method.

(b) Algebraic method.

(A) Inspection method – In this method, we examine the equation and find the right balance.

[tex]2NaCl + BeF_2 = NaF + BeCl_2[/tex]

[tex]2NaCl + BeF_2 = 2NaF + BeCl_2[/tex].

(B) Algebraic method

Thus, these are the two methods of balancing a chemical equation.

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Answer:

Coefficient

Explanation:

We can explain this discarting options too. Now, let's write again the chemical equation;

C3H8(g)+5O2(g)→3CO2(g)+4H2O(l)

In a chemical equation, we have two sides. The left side we have the reactants of the reaction, these can be elements or compounds that reacts between each other, to produce another compound or substance. This compounds or elements are on the right side of the reaction. This side we have the products of the reaction of reactants.

Now, as in every situation of life, we need a balance of reactants and products, so, the only way to balance a chemical equation is by putting numbers behind every compound of the reactant and/or products to equal the number of atoms on each side. So if in the reactants we have 3 atoms of C, in the products we need to have the same 3 atoms.

Based on the above explanation, we can say that the number 4 is behind the H2O. This compound is on the side of products, but the number only, do not represent a product, so this option can be discarted.

A reactant cannot be either, cause it's not on the side of reactant.

Chemical formula, could be, if the number were as subscript, but it's not the case, and the chemical formula is composed of symbols.

Finally, as the number that we put behind the compounds work to balance the equation, the only function that these numbers have here, is to be coefficients of the reactions, and furthermore, it will work as mole.

So the correct option is the third one, Coefficient.

The mass of the pencil mark can be calculated using the formula: M = V x density of atoms x mass per atom. Given the volume of the pencil mark and the density and mass per atom of carbon, the mass of the pencil mark can be determined. The mass of the pencil mark is approximately 3.5 x 10^39 kg.

The mass of the pencil mark can be calculated using the formula:

M = V x density of atoms x mass per atom

Given that the volume of the pencil mark is approximately 3 x 10-17 cm3 and the density and mass per atom of carbon are known, the mass of the pencil mark can be determined. Using the provided formula, the mass of the pencil mark is approximately 3.5 x 1039 kg.

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Monosaccharides, disaccharides, and polysaccharides are types of carbohydrates that consist of one, two, and many sugar molecules, respectively. Glucose and fructose are monosaccharides, sucrose and lactose are disaccharides, and starch and cellulose are polysaccharides.

Monosaccharides are the simplest form of carbohydrates and consist of one sugar molecule. Examples include glucose and fructose. Disaccharides consist of two monosaccharide molecules bonded together. Sucrose (table sugar) and lactose (milk sugar) are examples of disaccharides. Polysaccharides are complex carbohydrates made up of many monosaccharides linked together. Starch and cellulose are examples of polysaccharides.

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Sensory neurons, interneurons in spinal cord, motor neurons shows the path followed by nerve impulses in a reflex. Sensory neurons are the neurons that carry information from the environment externally to the central nervous system (CNS) mainly brain and motor neurons are those which carry information from CNS to other parts.  

A human perceives something then by sensory neurons the information goes to CNS and that information is further passed by interneurons in spinal cord and is further passed by motor neurons from CNS to other parts to perform stimulus of perception.

Explanation:

Kinetic energy is defined as the energy obtained by the molecules of a substance because of their motion.

Hence, when a substance or object is moving from its initial position then it means it has some amount of kinetic energy.

So, if molecules are moving then they have possessed kinetic energy and 3 things these molecules will do are as follows.

Answer:

Helium gas, symbol He

Explanation:

The gas that causes voice to change upon inhalation is helium which belongs to the inert gas/noble gas series in the periodic table. The chemical symbol is He.

When He gas is inhaled it fills up the vocal tract and replaces some of the air present in the cavity. Now, the density of He is much lower than that of air as a result the speed of sound as it passes through the vocal cavity increases which leads to a change in voice.