How are atoms of sodium and chlorine similar and different from one another?

The volume required of 0,3 N. acid solution to neutralize solution containing 0,32 g of NaOH in 40 cm³ is 26.66cm³.

N1V1 = N2V2

normality = molarity x basicity

For sulfuric acid, the basicity is 2.

∴N1=0.3N

V1=?

Normality of NaOH is [0.32/(40×40)]×1000

N2=0.2×1=0.2N

V2=40ml

0.3 x V1 = 0.2 x 40

V1 = 26.6 cm³

It is defined as the number of moles per liter of solution. It is used to measure gram equivalents to the total volume of the solution. It is used to measure the ratio of the number of moles in the total volume of the solution. The unit of normality is N or eq L-1.

The standard concentration (normality, CN) of a solution is always greater than or equal to the molarity (molarity, CM) of the solution.

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Answer:

The first image = double replacement

Second = single replacement

Third = Decomposition

Fourth = Combination

Explanation:

1. a color from each pair is being swapped and replacing each other so there is a double replacement

2. only the blue and the red are changing places so it is single replacement

3. the pair is being separated (decomposed)

4. the red and green are coming together (combined)

Platinum (Pt) has six naturally occurring isotopes (190Pt, 192Pt, 194Pt, 195Pt, 196Pt and 198Pt). Platinum -186 would have 78 number of protons and 117 number of neutron.

Platinum is a chemical element represented by the symbol Pt and the atomic number is 78. It is malleable, ductile, highly unreactive, precious, silverish-white transition metal. Platinum (Pt) has six naturally occurring isotopes (190Pt, 192Pt, 194Pt, 195Pt, 196Pt and 198Pt).

Platinum is classified as a transition metal. Platinum atoms have 78 electrons and 78 protons with 117 neutrons in the most abundant isotope of platinum.

Thus, Platinum -186 would have 78 number of protons and 117 number of neutron.

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The correct statement about the population shown in this graph is

The population is not continuing to grow because it has reached its carrying capacity.

Population typically refers to the number of people in a single area, whether it be a city or town, region, country, continent, or the world.

The carrying capacity of an environment is described as the maximum population size of a biological species that can be sustained by that specific environment, given the food, habitat, water, and other resources available.

The purpose of Carrying capacity is that it is a concept for biologists when trying to better understand biological populations and the factors that affect them.

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Voltage-gated calcium channels in the active zones of the synaptic terminal open when the membrane depolarizes and causes the release of synaptic vesicles.

The active zone of neurones is a  site on the motor nerve terminal of the neuron and  this site the synaptic vesicles fuse with the cell membrane of neurones for release the contents of the synaptic vesicle. The release of contents from synaptic vesicles are  through voltage-gated Calcium channels. This channels are opens when a membrane is depolarization for release of vasicles that are in synapse.

This channel also called Presynaptic Ca2+ channel and  calcium ion entry into the active zone  and this happens because of  voltage-gated Ca2+ channels are  activated when membrane depolarization occurred. and release neurotransmitter from synaptic vesicles.

Hence, option C is correct.

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B. Cao(s) (Calcium oxide)

The balanced equation would be:

Ca(s) + O2(g) --> Cao(s)

It is the product of Calcium oxide.

The product of the reaction between sodium and chlorine is sodium chloride (NaCl). When sodium (Na) and chlorine (Cl) react, they form an ionic bond, with the sodium atom losing one electron to the chlorine atom. This forms a positively charged sodium ion (Na+) and a negatively charged chloride ion (Cl-), which are held together by electrostatic attraction to form the compound sodium chloride. It is a white crystalline solid and is commonly known as table salt.

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After much experimentation, John discovers a law which says that the wavelengths of light absorbed by hydrogen gas fit into a pattern which he is able to express in a mathematical formula.

Niels has a hypothesis about why the wavelength of light absorbed by hydrogen has a certain value. Niels suggests the orbit of the electron in the hydrogen atom can only have certain radii, and when the electron "jumps" from one orbit to another, it emits light of an energy corresponding exactly to the difference in orbit energies.

In physics, wavelength is defined as the distance traveled by a wave in one period. Wavelength is represented by the Greek letter lamda (λ). That's why the wavelength formula is often called the Lambda formula.

How to calculate the lambda formula depends on the type of wave. Based on the direction of propagation, waves are divided into two types, namely transverse waves and longitudinal waves.

Transverse waves are waves whose direction of propagation is perpendicular to the direction of vibration. Examples include water waves, string waves, and light waves. Meanwhile, longitudinal waves have a direction of propagation that is parallel to the direction of vibration, for example sound waves.

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The new Vapor pressure of the dietheylether is  6.52 atm.

We have to note that the vapor pressure would have to do with the ease with which the substance can be converted from liquid to vapor. In this case we can see that we have about two different temperatures and we are trying to obtain the vapor pressure at each of the temperatures that have been given.

Using the formula;

ln(P2/P1) = -ΔHvap/R(1/T2 - 1/T1)

P2 = final pressure

P1 = initial pressure

ΔHvap = Enthalpy of vaporization

R = constant

T = Temperature

ln(P2/0.703) = -29.1 * 10^3/8.314(1/354 - 1/298)

ln(P2/0.703) =  -3651.3(0.0028 - 0.0034)

ln(P2/0.703) = 2.19

(P2/0.703)  = e^2.19

P2 = e^2.19 * 0.73

P2 = 6.52 atm

It has a vapor pressure of about  6.52 atm.

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Answer:

_4

Explanation:

according to how the ph scale is arranged ,you will notice that when tou move from ph 10 to ph 6 the form changes to negative and it will give the answer as _4

Answer:

3.6999 x 10^2 l.

Explanation:

To find the volume of air with a mass of 1 lb, we can use the density formula:

Density = Mass divided by Volume

Rearranging the formula to solve for volume:

Mass / Density = Volume

Given that the density of air is 0.001226 g/ml, and we want to find the volume of 1 lb of air, we can substitute the following values into the equation:

(1 pound) / (0.001226 g/ml)

To convert pounds to grams, 1 pound equals 453.59 grams.

Volume = 453.59 g/0.001226 g/ml = 369,988.6 ml

Now we can convert from milliliters to liters. 1 liter equals 1,000 milliliters.

Volume = 369.99 l/1000 = 369,988.6 ml

To express it in scientific notation, you can use a factor of 10 to represent the decimal place. You move the decimal point of the number to the left or right until you have only one non-zero digit to the left of the decimal point.

369.99 l = 3.6999 x 10^2 l

So the volume of 1 lb of air is 3.6999 x 10^2 l.

option (C) During the first 20 years, the population of deer increased.

In common parlance, a population is a distinct group of people who share a common citizenship, identity, or set of traits. A population is a sampling that is typical of a broader group of individuals (or even objects) that share one or more characteristics.

The entire group of organisms and the natural setting in which they live together make up an ecosystem. Through nutrient cycles and energy exchanges, these biotic and abiotic elements are interconnected. Through photosynthesis, energy enters the system and is absorbed into plant tissue.

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One common example of homolytic cleavage is when water (H20) molecules split into hydrogen (H202) and oxygen (02) radicals.

One well-known example of heterolytic cleavage is the decomposition of water into hydrogen and oxygen gases.

Cleavage of heterolytic bonds also known as heterolysis. When a bond is broken, the products experience an uneven distribution of the bonding electron pair. Usually, at least one ion is produced by heterolytic cleavage.

Homolytic bond cleavage, also known as homolysis, is the bond breaking process in which the bonding electron pair is evenly divided amongst the products. Radicals frequently result from homolytic cleavage. The chain initiation mechanism stage in the photolytic bromination of methane is an illustration of homolytic bond cleavage.

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Answer:

a)0.1moles

b)2.99moles

c)0.5moles

expressed in molar mass

a)26g/mol

b)14g/mol

c)17g/mol

Explanation:

remember

1mole=6.02×10^23

The two (2) statements that are true of the population shown in this graph include the following:

B. The number of individuals is increasing.

D. The population is growing unchecked.

In Science, a population can be defined as a set of similar items or events that comprises every member of a group and from which a researcher, scientist, or experimenter, obtains or generates data for a statistical study.

A population size can be defined as the number of individual (each) living organisms in a population, and it is usually denoted by N. Basically, population size is primarily associated with the number of genetic variation or genetic drift in a particular population.

Based on the graph, we can logically deduce that the number of individuals is increasing because the line models an exponent growth, which is also growing unchecked.

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Iron hydroxide is the compound that gives off some gold sparks in a flame test and the chemical formula of the compound is Fe(OH)₃.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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Answer:

in its neutral state an atom of Na has 11 electrons so when it loses an electron it becomes Na^+ with 10 electrons.

a neutral atom of Mg has 12 electrons by losing 2 elections it becomes Mg^2+ with 10 electrons

a neutral atom of oxygen has 8 electrons if it gains 2 electrons it becomes O^2- with 10 electrons

a neutral atom of Ne has 10 electrons

All of the above species in their excited states has 10 electrons (except for Ne which has 10 electrons in its neutral state) so they are all isoelectronic with Na^+

In the identities, the first response when approaching a victim is immediately calling 911. The correct option is B.

If delaying treatment could endanger your life or a portion of your body, it is an emergency. An emergency can be brought on by a bad accident or a sudden acute sickness.

Other situations include active labor and excruciating pain. No matter where you are or which hospital you visit, your health plan must cover emergency care.

Calling 911 is the best option to do when there is an emergency, and you see a victim.

Therefore, the correct option is B. Immediately call 911.

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Answer:  The correct answer is to Evaluate the situation.

Explanation:  This answer has been confirmed correct.

When you first discover someone that needs assistance, you should immediately evaluate the situation. If the person is conscious and alert, then you should ask their permission to help them. If they are not conscious or alert, you should then call 911.

The molecular formula of the compound is C₂Cl₂.

The empirical formula of a chemical compound is the smallest ratio of elements present in the compound. From the analysis

Calculate the number of moles of the compound using the ideal gas equation P × V = n × R × T

P × V = n × R × T

1.10 × 0.01 = n × 0.0821 × 291.0

0.011 = n × 23.8911

n = 0.011 ÷ 23.8911

n = 4.6 × 10⁻⁴ mol

Calculate the molecular mass using Stoichiometry n = m ÷ M

M = m ÷ n

M = 0.04373 ÷ (4.6 × 10⁻⁴)

M = 95.0 g/mol

The molecular mass for the compound equals the molecular mass from the empirical formula times n.

M = M ((CCl)ₙ)

95.0 = (12 + 35.5) × n

95.0 = 47.5 × n

n = 95.0 ÷ 47.5

n = 2.1

n ≈ 2

The molecular formula times 2 from the empirical formula C₂Cl₂

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Beaker 1 would have a temperature of 22 degrees Celsius and a volume of 50 mL.

Temperature is a physical property of matter that quantitatively expresses hot and cold. It is measured in Kelvin, Celsius, or Fahrenheit. Temperature is important in many physical, chemical, and biological processes. In thermodynamics, temperature is a measure of the average kinetic energy of the microscopic particles that make up a substance. It is related to the average energy of microscopic random motion of the particles that make up a substance. Increasing the temperature of a substance increases its average kinetic energy and vice versa. Temperature is a measure of the intensity of heat, and it is used to compare the relative hotness or coldness of an object. Temperature can also be used to measure the amount of energy being transferred between two objects or systems.

Beaker 2 would have a temperature of 20 degrees Celsius and a volume of 50 mL.

Beaker 3 would have a temperature of 15 degrees Celsius and a volume of 50 mL.

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Two moles or 78 g of potassium metal reacts with water to give one mole or 2 grams of hydrogen gas. Then 20 g of K will give 0.51 g of hydrogen gas.

Metals especially alkali metals and alkaline earth metals are highly reactive towards air and water. By reacting with water these metals produces their corresponding hydroxides.

Potassium reacts with water forms KOH as written below:

[tex]\rm 2K + 2H_{2}O \rightarrow 2 KOH + H_{2}[/tex]

As per this reaction, 2 moles of K produces 1 mole of hydrogen

atomic mass of K = 39 g/mol

mass of 2 K = 78 g

mass of H₂ = 2g

Then mass of H₂ produced from 20 g of K is:

mass of H₂ = (20 × 2) /78 = 0.51 g

Therefore, 0.51 g of hydrogen gas is produced by 20 grams of potassium metal.

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Answer:

Explanation:

An anion is a negatively charged ion, meaning it has gained one or more electrons. A cation is a positively charged ion, meaning it has lost one or more electrons. The charge of an ion can be determined by its atomic number, the number of protons it contains, and the number of electrons it contains. An anion will have more electrons than protons and a cation will have more protons than electrons. An anion will be attracted to positive charges, while a cation will be attracted to negative charges. Anions and cations can also be compared based on their size and shape. Anions are typically larger than cations, and they often have a spherical shape. Cations, on the other hand, are typically smaller and have a more angular shape.

Answer:

Explanation:

An acid is a substance that can donate protons (H+) to water when dissolved in it, resulting in an increase in the concentration of H+ ions in the solution.

When NaCl (sodium chloride) is dissolved in water, it dissociates into its individual ions, Na+ and Cl-. These ions do not donate protons to water, so NaCl does not form an acid when dissolved in water.

NO2 (nitrogen dioxide) is a neutral compound, it does not donate protons to water and does not form an acid when dissolved in water.

H2SO3 (sulfurous acid) is an acid, when dissolved in water, it donates protons to water and forms H+ ions and SO3- ions.

HCl (hydrochloric acid) is an acid, when dissolved in water it donates protons to water and forms H+ ions and Cl- ions.

So the answer is H2SO3 and HCl are the compounds that would form an acid when dissolved in water as an aqueous solution.

Answer:7.3

Explanation:

To name ions from radicals, first identify the charge of the ion by counting the number of protons and electrons.

What do you mean ions?

Ions are atoms or molecules that have gained or lost one or more electrons and thus have a net electric charge. They are formed when an atom gains or loses electrons in a chemical reaction. Examples of common ions include sodium (Na+), chloride (Cl-), calcium (Ca2+), and magnesium (Mg2+).

Then determine the name of the ion based on its charge. For example, if the ion has a positive charge, it is called a cation; if it has a negative charge, it is called an anion. Finally, name the ion using the element's name and its charge. For example, a radical with two protons and one electron would be a cation and would be named “Hydrogen ion”.

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Using Nernst equation, the pH of the unknown solution is 2.99

The pH of an unknown solution can be calculated by using the Nernst equation, which relates the cell potential (emf) to the concentrations of the species involved in the half-reaction. The Nernst equation for the hydrogen electrode is as follows:

E = E₀ + (0.05916/n) * log(H+)

Where:

Given that the pressure of H₂(g) was maintained at 1atm, we can assume that the concentration of H⁺ is equal to the concentration of H₃O⁺ in the unknown solution.

Rearranging the equation we get:

pH = -log(H⁺) = (E - E₀) / (0.05916/1)

Substituting E = 0.4188 V and E₀ = 0.2415 V we get:

pH = (0.4188 - 0.2415) / (0.05916/1) = 2.996

Therefore, the pH of the unknown solution is 2.99.

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As mentioned, 684 g of lead would've been needed to produce 119 g of water.

The mass of a material or substance tells us how much matter makes up that thing or substance. Despite the possibility of using grams to describe strength training, the kilowatt (kg) is the primary SI mass measurement (g). To measure mass, you might employ a balance. The amount of material an item contains is significantly influenced by its mass. A picture's gravity may be estimated based on its density. Along with its gravity, an element's location is crucial. This means that weight is still used to represent force.

(119 g H₂O) / (18.01532 g H₂O/mol) x (1 mol Pb / 2 mol H₂O) x (207.21 g Pb/mol) = 684 g Pb

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The pressure on a cold winter day would be 16.03 psi.

The pressure law state that the pressure of a gas at constant volume is directly proportional to its temperature. This law can be mathematically expressed as follows:

[tex]P_1/T_1 = P_2/T_2[/tex]

Where [tex]P_1[/tex] = initial pressure of the gas, [tex]T_1[/tex] = initial temperature, [tex]P_2[/tex] = final pressure, and [tex]T_2[/tex] = final temperature.

In this case, [tex]P_1[/tex] = 33 psi, [tex]T_1[/tex] = 35 [tex]^oC[/tex] and [tex]T_2[/tex] = -17 [tex]^oC[/tex]. What we are looking for is [tex]P_2[/tex].

[tex]P_2[/tex] = [tex]P_1.T_2/T_1[/tex]

    = 33 x -17/35

     = 16.03 psi

In other words, at constant volume and without leakage, the pressure in the tire on a cold winter day when the temperature is -17 [tex]^oC[/tex] would be 16.03 psi.

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The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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The power sector is targeted for the application of hydrogen fuel cells.

This type of fuel produces electricity through the combination of hydrogen and oxygen atoms. The hydrogen reacts with oxygen across an electrochemical cell and produces electricity, water, and heat in a very small quantity.

Hydrogen-powered fuel cell electric vehicles doesn't have any carbon emission or greenhouse gases such as carbon dioxide etc which depletes the ozone layer and causes global warming.

It emit none of these harmful substance and only emits water and warm air which makes it a very clean fuel thereby causing a reduction in pollution and reducing the risk of respiratory diseases.

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Answer:

Explanation:

The two terms in the sequence are 16 and 13.