7.Lithium Is An Element In Group 1 Of The Periodic Table.Lithium Is Stored In Oil To Prevent It From (2024)

The amount of energy required to increase the temperature of one gram of water by one degree Celsius is known as a "calorie," which is a unit of energy.

For example, a 170 calorie can of beer actually contains 170,000 calories of digestible energy,

so if a student foolishly decides to binge drink 21 beers, the equivalent amount of digestible energy in the beer is 21x17000.

= 3570kcal

Nutrition labels on food products typically tell you how many calories of digestible energy are in one serving, where "digestible" means that the energy stored in the chemical bonds of the molecules comprising the food can be extracted by your body.

Another heat measurement unit used in the US is the British thermal unit, or Btu. The amount of heat needed to increase 1 lb of water's temperature by 1°F is equal to 1 Btu.

As a result, the energy in BTUs E(BTU) is equivalent to 0.00029307107017 times the energy in kilowatt-hours E(kWh):

E(kWh) = 0.00029307107017 × E(BTU)

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Answer:

Two ways is by reducing the mass of the pulley we can increase its efficiency and by applying more force than usual

Explanation:

Answer:

Explanation:

Ionic bonds give away electrons. Only in covalent bonds are electrons shared, and depending on the polarity of the molecule, would the electrons be shared or unshared equally? The sea of electrons only refers to metallic bonds.

Therefore: Ionic bonds give away electrons.

Almost everything expands from heating, taking up more space with the same weight and so becoming less dense. Gas, liquids, and sufficiently soft solids can convert if heated from below, with warming of the lower layer causing it to rise.

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).

A pure gas, such as a noble gas like neon, can be made up of a single atom (such as oxygen), an elemental molecule, or a complex molecule, which is made up of a variety of atoms (e.g. carbon dioxide). A gas mixture like air contains a range of pure gases. The difference between gases and liquids and solids is the enormous space between each individual gas particle. This gap usually makes a colorless gas undetectable to a human observer.

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Any area that has been treated with talcum powder or skin lotion must be rubbed with alcohol to remove the residue and facilitate the adherence of the leads.

What is Alcohol?

This is referred to as a substance which is derived from the fermentation of sugar under anaerobic conditions and it usually has an intoxicating effect.

However, it is also used for other purposes such as skin care and is usually applied after it has been treated with talcum powder or skin lotion so as to remove the residue and facilitate the adherence of the leads thereby making alcohol the correct choice in this scenario.

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A line segment joining a vertex to the middle of the other side of a triangle, cutting that side in half, called the triangle's median.

What is Centroid?

Each vertex of a triangle has a same number of medians, which all cross at the triangle's centroid.

The place where the triangle's three medians cross is referred to as the centroid of a triangle or the geometrical center of a triangle.

A triangle's median is a line segment that connects a vertex to the middle of the other side, slicing it in half. Every triangle has exactly three sides. The triangle is split into two equal-sized triangles by a median. The intersection of the three medians is referred to as the centroid.

Therefore, A line segment joining a vertex to the middle of the other side of a triangle, cutting that side in half, called the triangle's median.

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The amount of energy needed to free the most loosely bound electron from the outermost shell of an isolated gaseous atom is known as the ionization enthalpy or energy.

The ionization energy measures an element's capacity to participate in chemical processes that call for the creation of ions or the donation of electrons. It is often connected to the kind of chemical bonds that exist between the components in the compounds they create. See also electron affinity and binding energy. The outermost electron is more tightly connected to the nucleus as a consequence of the increased nuclear charge.

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Answer: The hybridization that is involved in SF4 is sp3d type. Here will learn and understand how to determine SF4 hybridization. We will discuss the steps in detail.

Name of the MoleculeSulphur Tetrafluoride

Molecular Formula= SF4

Hybridization Type= sp3d

Bond Angle= 102o and 173o

Geometry= see-saw

Explanation:

In order to determine the hybridization of sulphur tetrafluoride, you have to first understand its Lewis structure and the number of valence electrons that are present. The SF4 molecule consists of a total of 34 valence electrons. Here 6 will come from sulphur and each of the four fluorine atoms will have 7 electrons.

During the formation of SF4, the sulphur atom will form bonds with each of the fluorine atoms where 8 valence electrons are used. Meanwhile, the four fluorine atoms will have 3 lone pairs of electrons in their octet which will further utilize 24 valence electrons. In addition, two electrons will be kept as lone pairs in the sulphur atom. Now we can determine sulphur’s hybridization by taking a count of the number of regions of electron density.

When bonding takes place there is a formation of 4 single bonds in sulphur and it has 1 lone pair. Looking at this, we can say that the number of regions of electron density is 5.

EXTERNAL LINKS :

https://www.chemtube3d.com/vseprshapesf4/

https://geometryofmolecules.com/sf4-lewis-structure-polarity/

Answer:

Shale and siltstone

Explanation:

hope this helps

Answer:

true

Explanation:

im smart

Answer:

true, oxidation number for Cl2 = 0

If an element has six protons in the nucleus and its atomic number is 6. Then, the element is carbon (C). Therefore, option A is correct.

What is carbon ?

The chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons can be used to create covalent chemical bonds. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains barely 0.025 percent carbon.

6 protons plus 7 neutrons equals 13 for carbon atoms with 7 neutrons. These atoms make up the carbon-13 isotope.

An atom having six protons, six electrons, and seven neutrons would have an atomic mass of thirteen. The sum of an atom's protons and neutrons, which in this case is 6 + 7 = 13, determines its atomic mass.

Thus, option A is correct.

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The monomers that makeup proteins are amino acids. The basic structure of amino acids is shown below:

One or more polypeptides, which are separate chains of amino acids arranged in a linear way, come together to form a protein. There are 20different kinds of amino acids that are typically present in proteins.

A core carbon atom, sometimes referred to as the alpha (α) carbon, is joined to an amino group ([tex]NH_{2}[/tex]), a carboxyl group (COOH), and a hydrogen atom to form the fundamental structure of all amino acids.

The R group, a second atom or group of atoms attached to the central atom in every amino acid, is what gives the amino acid its identity. For instance, the amino acid is glycine if the R group is a hydrogen atom, and alanine if the R group is a methyl [tex]CH_{3}[/tex] group.

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When hydrogen forms a covalent bond with another atom, it typically forms a sigma (σ) bond. A sigma bond is a type of covalent bond.

A sigma bond is a type of covalent bond that is formed by the overlap of atomic orbitals along the axis connecting the two atoms. Sigma bonds are the strongest and most stable types of covalent bonds, and they are responsible for the majority of the bonding in most molecules.

In the case of hydrogen, the sigma bond is formed by the overlap of the 1s orbital on the hydrogen atom with an orbital on the other atom. The 1s orbital is the lowest energy orbital on the hydrogen atom and is characterized by a spherical shape. When hydrogen forms a covalent bond with another atom, the sigma bond is typically the only bond that is formed. It is important to note that hydrogen can also form other types of bonds, such as pi (π) bonds, which are formed by the overlap of atomic orbitals perpendicular to the axis connecting the two atoms. However, these types of bonds are less common and are typically weaker than sigma bonds.

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Answer:

CuSO4+NaOH=Cu(OH)2+Na2SO4

Erwin Schrodinger is the scientist who created the present theory of the atom, which states that electrons are found in areas known as orbitals or electron clouds.

He proposed the treatment of electrons as matter waves in the quantum mechanical model of the atom. In 1926, Erwin Schrodinger created the "Electron Cloud Model." It was made up of an electron cloud with many different orbital levels surrounding a dense nucleus. He determined areas around the nucleus that are most likely to contain electrons based on his estimates. He referred to these areas as orbitals. "Lobes" are a term used to describe the likelihood of finding electrons in orbitals. This atomic model is a representation of an atom that has a small, massive nucleus that is encircled by a cloud of electrons that are travelling quickly.

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If 34.57 mL of a solution of acetic acid are required to neutralise 25.19 mL of sodium hydroxide with a 0.1025 M concentration, determine the molarity of the solution.

The amount of acetic acid in moles per solution liter is known as the molarity. The mass of the solution divided by the density gives the area of the mixture. Subtract the amount of the analyte from the amount of moles of the analyte that are present. For instance, if the analyte's initial volume were 500 mL, divide that by 1000 mL / L to get 0.5 L. To get 0.02 moles per liter, divide 0.01 mole of analyte by 0.5 L. This is the molarity or concentration. The typical equation is C = m/V, in which C is the percentage, m is the weight of the drop wise, as well as V seems to be the total amount of the solute.

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The gas that has particles that move at a greater speed is O₂ with a mass of 32 amu at 15 degrees.

What is the relationship between the molar mass of a gas and the speed of the particles of the gas?

The molar mass of gas and the speed of the particles of the gas are inversely proportional. This means that the higher the molar mass of a gas, the lower will be the speed of the particles of the gas

This is in accordance with Graham's law of diffusion which states that the rate of diffusion of a gas is inversely proportional to the square of the density of the gas.

Also, an increase in the temperature of a gas will result in an increase in the speed of the particles of the gas.

However, for two gases at the same temperature, the molar mass of the gases will determine the speed of the particles of the gas.

The heavier gas will have particles that move at a lower speed.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, gems have ionic bonding and plastic beads have covalent bonding.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Gems have ionic bonds formed between metals and nonmetals. Plastic beads, will have covalent bonds because it is easily deformed.

Therefore, gems have ionic bonding and plastic beads have covalent bonding.

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a 150- mgmg sample of technetium-99 mm is used for a diagnostic test. if technetium-99 mm has a half-life of 6.0 hh , 19 milligrams of the technetium-99 mm sample remains active 18 hh after the test.

Decay of radioactive substances follows first-order kinetics. First order rate equation is A = Ao e-kt. Ao = Intial active amount of substances .

A = Active amount of substance after certain time (t), K = Decay constant. k = ln2 / t½, k = 0.693 / 6.0 hr, k = 0.1155 / hr. A = Ao e-kt A = 150 mg x e-0.1155 hr?¹ x 18.0 hr. A = 18.758 mg.So Answer = 19 g of remains active 18 h after the test.The half-life of a quantity is the time it requires to decrease to half of its original value. In nuclear physics, the term is usually used to describe how rapidly atoms undergo radioactivity or how long stable atoms live. The term is also used to describe any kind of exponentially decaying in general.

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The statements was true for the system between time t1 and time t2 is (d) the rates of the forward and reverse reactions were equal.

The balanced reaction is given below :

N₂(g) + 3H₂(g) ⇄ 2NH₃(g)

The equilibrium is the condition at which the rate of the forward reaction is equal to the rate of the forward reaction . The chemical equilibrium are two of two types , the homogeneous equilibrium and the heterogeneous equilibrium.

The homogenous equilibrium is the type of the equilibrium in which the reactant and the products are in the same phase. in heterogenous equilibrium equilibrium there are in different phase.

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Answer:

To determine the percent composition by mass of sulfur in the compound MgSO4, we need to first determine the molecular weight of sulfur in this compound. The molecular weight of a compound is the sum of the atomic weights of all of the atoms in the compound. In the case of MgSO4, the molecular weight is equal to the sum of the atomic weight of magnesium, the atomic weight of sulfur, the atomic weight of oxygen, and the atomic weight of oxygen.

The atomic weight of magnesium is 24.31 grams per mole, the atomic weight of sulfur is 32.06 grams per mole, and the atomic weight of oxygen is 15.999 grams per mole. Therefore, the molecular weight of MgSO4 is equal to 24.31 + 32.06 + 15.999 + 15.999 = 98.369 grams per mole.

To determine the percent composition by mass of sulfur in this compound, we need to divide the molecular weight of sulfur in the compound by the molecular weight of the compound, and then multiply by 100%. In this case, the molecular weight of sulfur in the compound is 32.06 grams per mole, and the molecular weight of the compound is 98.369 grams per mole. Therefore, the percent composition by mass of sulfur in MgSO4 is equal to (32.06 / 98.369) * 100% = 32.5%.

This means that 32.5% of the mass of MgSO4 is due to the sulfur atoms in the compound. The remaining 67.5% of the mass is due to the magnesium, oxygen, and sulfur atoms.

If a strong acid is added, this does not become a buffer and does not dampen sudden changes in pH .

Buffers are used to keep the pH of a solution in a more stable state. This can be done in one of two ways: you can use a weak base to neutralize a strong acid or vice versa.

In order for this to work, the solution must have a pH below 7. For example, a strong acid with a pH of 1 would have a pH of 7 once a weak base was added. This can be tricky when using acids and bases of the same molarity.

The addition of a strong base to a weak acid does not make a buffer. However, the ratio is irrelevant when it comes to whether or not it is a buffer.

So, If a strong acid is added, this does not become a buffer and does not dampen sudden changes in pH .

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The molecular formula is C32H80O8.

What is empirical formula?

The empirical formula is the simplest whole-number ratio of the atoms of different elements in a compound. It is determined by experiment and is not necessarily the same as the molecular formula. The empirical formula does not provide information about the arrangement of atoms in the molecule or any information about the isomers of the molecule. The empirical formula of a compound is also referred to as its simplest formula or simplest ratio.

The molecular formula for this compound can be determined by first calculating the empirical formula.

The empirical formula can be determined by dividing the mass percentage of each element by its relative atomic mass.

Carbon: 64.9/12 = 5.41
Hydrogen: 13.5/1 = 13.5
Oxygen: 21.6/16 = 1.35
Now, to get the empirical formula, we divide each number by the smallest one (1.35):
Carbon: 5.41/1.35 = 4

Hydrogen: 13.5/1.35 = 10

Oxygen: 1.35/1.35 = 1
Therefore, the empirical formula is C4H10O.
The molecular formula is then determined by multiplying the subscripts of the empirical formula by the given molecular mass (74 g/mol). The molecular mass must be divisible by the empirical formula mass (which is 74 g/mol).
C4H10O * 8 = C32H80O8
The molecular formula is C32H80O8.

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The Correct order of the steps of drawing a covalent structure is given below.

Count the total valence electrons.Draw the skeleton structure.Count the number of bonded electrons and subtract from total.Distribute remaining electrons in non-bonded pairs.Draw the bonding electrons between atoms.Check the octet rule for all atoms in the molecule.

What is covalent structure?

A covalent structure refers to a chemical bond formed by the sharing of a pair of electrons between two atoms. The atoms involved in a covalent bond are held together by the attraction between the positive nuclei of one atom and the negative electrons of the other.

This type of bond is characterized by the sharing of electrons and is typically found in molecules, which are groups of atoms held together by covalent bonds.

Therefore, Covalent bonds are typically stronger than ionic bonds, which are formed by the transfer of electrons from one atom to another, and they generally result in the formation of molecules with lower melting and boiling points. Examples of covalent molecules include water, methane, and oxygen.

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Kc for the reverse reaction is the negative of Kc for the forward reaction is the false statement.

What is equilibrium constant?

The equilibrium constant of any chemical reaction is the value of its own reactions quotient at chemicals equilibrium, a State approaches by a dynamically chemicals systems after sufficient times has elapsed at which is in its compositions has no measurable tendency towards furthermore change.

As we know,

Value of Kc for the reverse reaction is always in the from of reciprocal.

Let's take

A<----------------> B,Kc

For reversion reaction we have to take

B<------------------>A,1/Kc

In this equation all the statement are correct.

Thus Kc for the reverse reaction is the negative of Kc for the forward reaction is the correct answer.

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The Jim passes a 1.5 kg basketball of 60 N. The acceleration is 40 m/s². Therefore, option A is correct.

What is acceleration ?

Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.

Acceleration is the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.

A = F / m

= 60 / 1.5

= 40 m/s²

Thus, option A is correct.

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Group 18 elements are termed as noble gases. These include Helium, Neon, Argon, Krypton, Xenon, and Radon. These are also termed as inert gases as they do not participate in reactions and are highly stable compounds.

Properties of Noble Gases:

Noble gases have their outermost orbit completely filled i.e they have their octet filled.They belong to the Group 18 of the modern periodic table.They can't donate or accept electrons due to their fully filled valence shell. So, they do not take part in chemical reactions. That's why they are named as 'Inert Gas'.They do not tend to attract electrons towards themselves due to the presence of fully filled valence orbitals. They have very low electronegativities.They have very high ionization energies.They can conduct electricity at low pressures.Due to the electronic arrangements of noble gases, they do not donate or accept electrons which means they don't form bonds with other atoms or even with similar atoms.They exist alone in nature rather than combining with other molecules.

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360 ml of the 70% acid and 540 ml of the 20% acid is required to make the 40% acid.

What is the volume combined?

We know that this is a mixture problem thus we would have to apply the algebra of the problem so as to obtain the required solution. We are told that; The chemist combines x ml of a 20% acid solution, and y ml of a 70% acid solution to make the 40% acid solution.

We would then set up a pair of equations as follows;

x + y= 900...........eq 1

0.2x + 0.7y= 0.4(900)...eq 2

x = 900 - y ------ eq 3

Then;

0.2( 900 - y) + 0.7y = 360

180 - 0.2 y + 0.7y = 360

0.5 y = 180

y = 360 ml

Then we have;

x + 360 = 900

x = 540 ml

These are the required volumes.

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By raising the pressure to 1.89 atm and keeping the temperature constant, 2.86 L volume of gas was consumed.

The initial pressure is 758 torr, and the question specifies a temperature of 21. The initial volume is 5.42 L. 1.89 atm has been given as the final pressure.

Atm units have been used to convert the original pressure.

1 atm Equals 760 torr so,

0.997 atm = 758 torr

In line with Boyle's law: [tex]P1*V1=P2*V2[/tex]

Where, P1 and V1 stand for, respectively, the starting pressure and volume. The final pressure and volume are P2 and V2, respectively.

so,

0.997 atm * 5.42 L = 1.89 atm * Final volume

Final volume: 2.86 L

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The frequency the is equivalent to a frequency of 85000 Hz is 85 KHz (Option D)

How do I determine the equivalent frequency?

We know from conversion identities that:

1000 Hz = 1 KHz1000000 Hz = 1 MHz1000000000 Hz = GHz0.001 Hz = mHz

With the above conversion identities, we can determine the equivalent of 85000 Hz. This is illustrated below:

Frequency (Hz) = 85000 HzEquivalent of 85000 Hz =?

1000 Hz = 1 KHz

Therefore,

85000 Hz = (85000 Hz × 1 KHz) / 1000 Hz

85000 Hz = 85 KHz

Thus, 85000 Hz is equivalent to 85 KHz

Therefore, the correct answer to the question is 85 KHz (Option D)

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