Use the periodic table in the tools bar to complete the electron configurations for the following elements:

Lithium (Li): 1sA2sB

A =
B =

Answer:

Best:

because their valence electrons absorb light

Minor:

because their valence electrons move to higher energy levels

Explanation:

When the electrons absorb light, they absorb this energy and they have a tedency to jump and get promoted to the high energy level.

As a result, they release out energy after being promoted. This energy is in form of light

\(.\)

Answer:

magnitude and direction

Answer:b

Explanation: took the test

Prism separate white light, such as that from the Sun according to their wavelength.

Prism is an optical object which have three flat polished surfaces and a triangular shape, from which refraction of light takes place.

When the sunlight or any vissible light falls on the surface of prism then the refraction of light takes place and due to refraction bending of light at different angles according to their wavelength takes place. As we know that vissible light consist all colors, so the separation of white light into the colors takes place through prism.

Hence white light gets separated through prism.

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Answer:

Molarity = 2 M

Explanation:

Given data:

Molarity of solution = ?

Number of moles = 2 mol

Volume of water = 1 L

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula

Molarity = number of moles of solute / L of solution

Molarity = 2 mol / 1 L

Molarity = 2 M

Answer:

Observations

Explanation:

Polonium (Po) is a radioactive silver-grey material that exists in very low concentrations as a solid in the environment.

As a radioactive substance, it is unstable and then it undergoes radioactive alpha decay to form a stable chemical element - Lead (Pb)

Polonium Nucleus before decay

Polonium (²¹⁰₈₄Po) has a mass number of 210 and an atomic number of 84. The atomic number tells us that Polonium has 84 protons in its nucleus before it undergoes decay.

The mass number tell us that Polomium has 126 neutrons in addition to the 84 protons in its nucleus

The total number of protons and neutrons in a nucleus make up its Mass Number

Polonium Nucleus  after decay

Polonium undergoes radioactive decay by emitting an alpha particle, which is also known as a Helium particle (⁴₂He)

                            ²¹⁰ ₈₄Po ⇒    ²⁰⁶ ₈₂Pb  +   ⁴₂He

Observations

It is not possible  that  a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the UV region as a result.

Both infrared rays and ultraviolet rays belong to the electromagnetic spectrum. However, the infrared rays are lower in energy than the ultraviolet rays. Hence, infrared rays have a longer wavelength than ultraviolet rays.

This implies that it is not possible that  a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the UV region as a result.

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To identify the functional groups present in a compound IR. spectroscopy uses the Infrared portion of the electromagnetic spectrum.

Due to the presence of both the N-H link and the C=O bond, an amide substituent combines the characteristics of amines and ketones.As a result, near the left side of the spectrum, around 3100 or 3500 cm-1 again for N-H stretch, amides exhibit a very strong, rather broad band.

To separate functional categories within the name, their prefixes and suffixes will differ.For instance, the primary amino group will employ the prefix "amino-" if it is a substituent and the suffix "-amine" if it is the highest priority group.

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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The increase in deforestation can have a significant impact on the atmosphere in the future, mainly by reducing the number of trees that absorb carbon dioxide during photosynthesis.

Trees take in carbon dioxide and release oxygen as a byproduct, reducing the amount of carbon dioxide in the atmosphere. However, when trees are cut down, the carbon they have stored is released back into the atmosphere, contributing to increased levels of greenhouse gases.

The increase in greenhouse gases can lead to global warming and climate change, which can have a range of negative effects on the environment and human health, such as rising sea levels, increased frequency and severity of natural disasters, and more intense heat waves. Additionally, deforestation can lead to soil erosion, loss of biodiversity, and disruption of local ecosystems.

It is important to find ways to reduce deforestation and promote sustainable land use practices to mitigate the potential impacts on the atmosphere and the environment as a whole.

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16.52 milliliters of 8.54×10⁻² M Ba(OH)2(aq) are required to titrate 54.90 mL of 5.14×10⁻² M HNO₃

A titration is a procedure that uses a known solution to determine the concentration of an unknown solution. Until the reaction is finished, the titrant (the known solution) is typically supplied from a buret to a known volume of the analyte (the unknown solution).

Titration is an essential technique in analytical chemistry, and it is also known as volumetric analysis.

n-factor for Ba(OH)₂ =2

Thus, dilution equation becomes:

n × M₁V₁= M₂V₂

2 x 8.54 x 10⁻² x V₁ = 5.14 x 10⁻² x (54.90/1000)

V₁= 16.52 × 10⁻³¹

V₁   = 16.52 ml

Thus, 16.52 milliliters of 8.54×10⁻² M Ba(OH)2(aq) are required to titrate 54.90 mL of 5.14×10⁻² M HNO₃

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Answer:

2 Hydrogen One oxygen

Explanation:

Answer:

Group #1 elements are metals and Group #17 elements are nonmetals.

When forming compounds, Group #1 elements lose electrons and Group #17 elements gain electrons.

Explanation:

Three choices are correct: Group #1 elements are metals and Group #17 elements are nonmetals.When forming compounds, Group #1 elements lose electrons and Group #17 elements gain electrons.Metals (Group #1) lose electrons when forming compounds and therefore become positive ions. Nonmetals (Group #17) gain electrons when forming compounds and become negative ions. Metals, except for mercury, are solid at room temperature while most nonmetals are gases. Both Group #1 and Group #17 are reactive groups.

The differences in the two families based on their locations in the periodic table is Group #1 elements are metals and Group #17 elements are nonmetals. When forming compounds, Group #1 elements lose electrons and Group #17 elements gain electrons.

A periodic table is an arrangement of all known elements in increasing atomic number order and recurring chemical properties.

It can also be defined as a tabular arrangement of chemical elements arranged by increasing atomic number and element groups.

There are more than 118 elements are arranged in modern periodic table.

The periodic table contains many different types of atoms such as

Thus, the differences in the two families based on their locations in the periodic table is Group #1 elements are metals and Group #17 elements are nonmetals. When forming compounds, Group #1 elements lose electrons and Group #17 elements gain electrons.

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The total kinetic energy of the gas sample is 3.3 KJ

This is the energy possessed by an object in motion. Mathematically, it can be expressed as:

KE = ½mv²

Where

Mass = mole × molar mass

Mass of fluorine gas = 1 × 38

Mass of fluorine gas = 38 g

KE = ½mv²

KE = ½ × 0.038 × 415²

KE = 3272.275 J

Divide by 1000 to express in kilojoule

KE = 3272.275 / 1000

KE = 3.3 KJ

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A compound is the substances that are formed by combining two are more chemical elements. A mixture is a substance created from two or more matter that can be separate with the help of physical methods. Compound substances are always homogeneous in nature.

5. 4.00 moles of O2 can react to produce 4.00 moles of CO2.

What is the relationship between moles of O2 and moles of CO2?

According to the balanced chemical equation, the ratio of moles of O2 to moles of CO2 is 2:1, which means that 4 moles of O2 would react with 2 moles of CH4 to produce 2 moles of CO2. Therefore, statement 5 is true.

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Answer:

mass is an extensive property..

Answer:

Following are the solution to these question:

Explanation:

Calculating the mean:

\(\bar{x}=\frac{175+104+164+193+131+189+155+133+151+176}{10}\\\\\)

  \(=\frac{1571}{10}\\\\=157.1\)

Calculating the standardn:

\(\sigma=\sqrt{\frac{\Sigma(x_i-\bar{x})^2}{n-1}}\\\\\)

Please find the correct equation in the attached file.

\(=28.195\)

For point a:

\(=3s+yblank \\\\=3 \times 28.195+50\\\\=84.585+50\\\\=134.585\\\)

For point b:

\(=3 \ \frac{s}{m}\\\\ = \frac{(3 \times 28.195)}{1.75 \times 10^9 \ M^{-1}}\\\\= 4.833 \times 10^{-8} \ M\)

For point c:

\(= 10 \frac{s}{m} \\\\= \frac{(10 \times 28.195)}{1.75 x 10^9 \ M^{-1}}\\\\ = 1.611 \times 10^{-7}\ M\)

It is calculated by using the slope value that is \(1.75 \times 10^9 M^{-1}\). The slope value \(1.75 \times 10^9 M^{-1}\)is ambiguous.

The heat evolved with the \(\rm B_2H_6\) has been 58.637 kJ.

From the balanced chemical equation, 1 mole of \(\rm B_2H_6\) reacts with 2 moles of Chlorine to give 3 moles of boron chloride and 6 moles of HCl,

The chlorine has been required in double the quantity of boron hexahydride.

The moles of Chlorine has been the limiting reactant.

The chlorine that has been responsible for the reaction with \(\rm B_2H_6\) will be:

6 Chlorine = 1 \(\rm B_2H_6\)

5.65 L Chlorine = \(\rm \dfrac{5.65}{6}\)

5.65 L Chlorine = 0.942 L \(\rm B_2H_6\).

The moles of \(\rm B_2H_6\) can be calculated as:

1 Mole = 22.4 L

Moles of \(\rm B_2H_6\) in 0.942 L = 0.042 mol.

The heat evolved for 1 mole \(\rm B_2H_6\) has been -1396 kJ.

The heat evolved for 0.042 mol \(\rm B_2H_6\) = 0.042 × -1396 kJ.

The heat evolved = 58.637 kJ.

The heat evolved with the \(\rm B_2H_6\) has been 58.637 kJ.

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The heat that is absorbed by the system is  1363 J. Option B

We know that in a chemical reaction that there could be the absorption or the evolution of heat. We say that there is the evolution of heat when heat has been lost from the system and there is the absorption of heat when heat has been gained by the system.

Number of moles of the barium hydroxide hydrate = 3.15 g/203 g/mol

= 0.015 moles

Number of moles of the ammonium thiocyanate = 1.52/76 g/mol

= 0.02 moles

If 1 mole of barium hydroxide hydrate reacts with 2 moles of  ammonium thiocyanate

0.015 moles of barium hydroxide hydrate reacts with 0.015 * 2 moles/1 mole

= 0.03 moles

Hence the limiting reactant is the ammonium thiocyanate.

Now the heat that is absorbed is;

H = mcdT

m = mass of the water

c = Heat capacity

dT = Temperature change

H = 100 * 4.20 * 3.1

H = 1363 J

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Answer:

i) The size of X ion is greater than that of X atom even though both contain the same number of protons because the ion has fewer electrons compared to the atom. When an atom forms an anion (negative ion), it gains electrons, which causes increased electron-electron repulsion. This repulsion causes the electron cloud to expand, and as a result, the ion becomes larger than the neutral atom.

In the case of element X, when it forms an ion with a -3 charge, it will gain 3 more electrons, increasing the total number of electrons to 18. This will cause the size of the X ion to be larger than the neutral X atom.

ii) To determine the compound of X in the -3 oxidation state, we first need to determine the element's identity. We know that X has 15 electrons in total (2 in the K shell, 8 in the L shell, and 5 in the M shell). Therefore, X has an atomic number of 15, which corresponds to phosphorus (P).

Since phosphorus is in the -3 oxidation state, it gains 3 electrons and becomes P^3-. To form a compound, we need a cation that can balance the negative charge. A common example is aluminum (Al), which has a +3 charge (Al^3+). When phosphorus and aluminum combine, they form the compound aluminum phosphide with the formula AlP.

Answer:

so 0.71 g/L

Explanation:

C =n/v n= to 0.355

v= 0.500L

The concentration of Na⁺ ions in the dilutes solution of 0.500 L is 0.131 molar.

Molarity is a concertation term for solutions. Mathematically it is the ratio of no. of moles of solute to the volume of solution in liter.

Molarity = (no.of moles / volume of solution in L)

Given that the volume of NaCl is 0.185 L and have a concentration of 0.355 M. The solution is diluted to 0.500 L , then the new concentration is calculated as follows:

M1 V1 = M2V2

(0.185 L × 0.355 M) = (0.500 L × M2), where M2 have to be calculated.

M2 = (0.185 × 0.355)/0.500 = 0.131 M

The concentration of Na⁺ will be one times the concentration of NaCl. Since the no.of moles of sodium ions and chloride ions are equal there.

Therefore, the concentration of sodium ions is 0.131 M.

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Answer:

Tapeworms and roundworms both belong to the same phylum however, their families are different from one another.

Tapeworms are flat, segmented intestinal parasites of the cat and dog and humans sometimes. They are present in the intestines of pets and depend on them, therefore, are parasites. These parasites look like tape which gives it its name.

Roundworms can also infect humans and the most common cases are among children. When not treated immediately, they can cause severe damage to a human host and can even cause blindness. Tapeworms are white in color with a long, segmented body.

This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.

By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.

In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.

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Answer:

below

Explanation:

2.7 g   per 100 ml is th same as 27 g per liter

Molar weight of Na Cl

   Na = 22.99  g/mole     Cl = 35.45 g/mole      Total= 58.44 g/mole

then 27 g is    27/ 58.44 = .462 moles per liter

                                                      which is .462 molar

Answer:

0.54 L

Explanation:

First we convert the given masses of O₂ into moles, using its molar mass:

Then we can solve the problem using Avogadro's law, which states:

Where:

We input the data:

And solve for V₂:

Answer:

Ray

Explanation:

Rays of the sun is used by plants to make their own food

Answer: true

Explanation:

Boyle's Law states both that as volume increases pressure decreases and that as pressure increases volume decreases. Explanation: Boyle's Law states that pressure and volume are inversely proportional, but also assumes that the material is a confined gas (so no amount of gas increases or decreases) and the temperature remains steady.

The concentration of the new potassium permanganate, KMnO solution is 0.06 M.

To find the concentration of the new solution, we can use the formula,

C₁V₁ = C₂V₂,

C₁ = 0.75,

V₁ = 20.0 mL,

V₂ = 250.0mL

C₂ is what we have to find. Plugging in the values we know, we get,

0.75 M x 20.0 mL = C₂ x 250.00 mL

Solving for C₂, we get the final concentration of the potassium permanganate.

C₂ = (0.75 M x 20.0 mL) / 250.00 mL

C₂ = 0.06 M

Therefore, the concentration of the solution has changed to 0.06 M from 0.75M.

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