Please answer my question.

As 1  nanometer= 1×10[tex]^-9[/tex] m , thus 1.1×10[tex]^-10[/tex] m=1.1×10[tex]^-1[/tex] nm is the diameter of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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A cation is an ion that is generally positively charged and has more protons than electrons as a result of one or more electron losses.

Two charged atoms are produced when a neutral atom gives an electron to another neutral atom. At first, we have two neutral atoms, each of which has an electrical charge of zero. Because an electron has a charge of -1, if one of the two neutral atoms loses an electron, it becomes positively charged (charge: +1).The other atom that takes the electron consequently becomes negatively charged (charge: -1). We will ultimately have two charged atoms as a result. An atom will transform into an ion, a positively or negatively charged particle, when one or more of its electrons are lost or gained. Because there are fewer negatively charged electrons left to balance the positive charges of the protons in the nucleus, losing electrons causes atoms to gain a positive charge.

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Two correct answers which describe how water mixes in a thermohaline current are A. Cold water sinks under warmer water. And D. Saltier water sinks under less salty water.

Thermohaline Current is caused by variations in the seawater's surface density from pole to equator. Variations in temperature (thermal) and salinity (haline) affect the equator-to-pole surface. On Earth's climate, the thermohaline ocean currents have a significant impact on circulating heat across the planet.

In the thermohaline current, warmer, fresher water masses are less dense and float, while colder, saltier water masses are more dense and sink. Due to its higher density, this cold, salty water sinks.

So, it is obvious that the correct answers are:

A. Cold water sinks under warmer water.

D. Saltier water sinks under less salty water.

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Answer:

Lead is a post transition metal of variable valency

Explanation:

Lead has been placed in group 1st and 2nd because lead chloride is slightly soluble in water and therefore, lead is never completely precipitated by adding dilute HCl to a sample; the rest of the lead ions are precipitated with H2​S in acidic medium.

Explanation:

The temperature of the the fixed gas is451.938°C

Answer:

c

Explanation:

c

Double bond in ethene is made up of sigma and Pi bonds.

The covalent bond will be formed by the lateral overlap of the atomic orbitals is known as pi bond. For example, ethylene molecule contain 5 sigma bonding as well as 1 pi bonding in it. Pi bond formation will takes place by the parallel orientation of the two p orbitals in an adjacent atoms by proper sideways overlap. Thus in any molecule in which pi bond formation will takes place at all the atoms must be having in the same plane. Thus in pi bond carbon carbon double bond rotation is restricted due to the maximum overlap of the p orbitals. Example : Ethene molecule

Sigma bond (σ bond): A covalent bond will be formed by the overlap of atomic orbitals and/or hybrid orbitals along with the bond axis (i.e., along a line connected to the two bonded atoms). The sigma bond in the hydrogen molecule is formed by overlap of a pair of 1s orbitals, one from each hydrogen atom.

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The two major components making up at least 3% each of the human body are magnesium and nitrogen.

Magnesium makes up about 2.4% of the body, while nitrogen makes up about 3.2%. Oxygen, selenium, and cobalt make up smaller percentages of the body, with oxygen making up about 65%, selenium making up 0.19%, and cobalt making up 0.0012%.

Carbon usually forms four single covalent bonds, while hydrogen typically forms one single covalent bond. Therefore, the answer for carbon:hydrogen is 4:1.

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According to the stoichiometry of the mentioned chemical equation 64.6 g of  glucose can be produced.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given chemical equation, there are total 256.6 g of reactants hence the same amount of products must be produced, thus mass of glucose= 256.6-192=64.6 g .

Thus, 64.6 g of  glucose can be produced in the given chemical equation.

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Sink- followed by a large amount of water Waste Bucket: Hydrochloric acid solution, Sodium hydroxide solution

Laboratory chemical waste can be disposed of in one of three ways: Non-hazardous waste should be disposed of in a sanitary sewer or garbage; sewer disposal should come after acid-base neutralization. Note:To be permitted, any other form of therapy must be incorporated within an experimental process.

There are several categories into which this garbage might be divided: dangerous, medical, biological, electrical, and lab. Reducing laboratory waste will provide a number of advantages, including monetary savings, lower disposal expenses, and increased lab safety.

The environment, the public's health, and the laboratory itself can all be harmed by improper laboratory waste disposal. The Laboratory: If it is discovered that a laboratory is unlawfully disposing of their hazardous waste, the EPA levies severe fines and penalties.

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The number of people can be changed by reducing them in other to increase the sleigh's acceleration.

This is referred to as the rate at which velocity changes with time, in terms of both speed and direction and it is a vector quantity.

Fewer people would increase the sleigh's acceleration because more weight usually have a slower acceleration and light weight have a faster acceleration because of the high force which is needed to move the body thereby making it the correct choice.

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The number of moles can be used to calculate k, which is the concentration divided by the time, and m, which is the molarity.

The total of all the powers to which the concentration terms in the rate law are raised to describe the reaction's observed rate is known as the order of a reaction. The reaction exhibits zero-order kinetics if the reactant concentration rises.

The reaction's rate constant is represented by the symbol k.

The rate constant of a zero-order reaction is written as concentration/time, or m/s, where m is the molarity and s is one second.

∴ [tex]k = mol L^{-1} s^{-1}[/tex] is the unit of rate constant.

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Between sodium ethide (NaCH₂CH₃) or sodium methylamine (NaNH₂CH₂), the strongest base is sodium methylamine (NaNH₂CH₂).

sodium ethide (NaCH₂CH₃) and sodium methylamine (NaNH₂CH₂) are both sodium compounds with a basic nitrogen atom. However, sodium methylamine is a stronger base than sodium ethide because it has a nitrogen atom with a lone pair of electrons that can participate in protonation to form a cation.

This increases the basicity of the compound, allowing it to be a stronger base than sodium ethide. In addition, the nitrogen atom in sodium methylamine is bonded to two hydrogen atoms, making it more basic than sodium ethide, which only has one hydrogen atom bonded to its nitrogen atom.

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A student was instructed to list four facts that may be inferred from the equation presented.

A mg, what is it?

A milligramme is 1,000 micrograms and one tenths of a gramme. Typically, a milligramme is denoted by the symbol mg. A microgram is one tenths of a milligramme one and millionth of a gramme. It is frequently shortened to mcg or ug.

A microgram is what?

Micrograms are a measurement unit (ug or mcg). One thousandth of a gramme is equal to one microgram. Micrograms are used in nutrition to measure the minuscule amounts of nutrients that we require. Micrograms may be used to determine the nutritional value of substances like folate and b - complex.

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Al₂Cl₆ is an empirical formula

An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms.

Yes the given formula of Aluminum trichloride represented as Al₂Cl₆ is an empirical formula. An empirical formula represents the lowest whole number ratio of atoms in a molecular compound. In this case,

Al₂Cl₆ represents the simplest ratio of two aluminum atoms to six chlorine atoms.

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The addition of which compound will cause a shift in equilibrium because of a common ion effect is Na₂CO₃ which is therefore denoted as option D.

This is referred to as the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.

The compound which has a common ion effect is Na₂CO₃ because when added to the solution, it is dissolved to produce Na⁺ and CO₃²⁻. This increases the concentration of CO₃²⁻ and the concentration of the products side, so the reaction will be shifted to the left side to suppress the increase in the concentration of CO₃²⁻.

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The full question is:

Consider the following system at equilibrium.

CaCO₃(s) = Ca²+(aq) + CO₃²-(aq)

The addition of which compound will cause a shift in equilibrium because of a common ion effect?

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

The best answer that explain in terms of intermolecular forces why NH₃ has a higher boiling point than CH₄ is because of Because NH₃ can form hydrogen bonds, and CH₄cannnot. The correct answer is A.

Hydrogen bonding and London dispersion forces function as the intermolecular attractive forces in NH₃. Only London dispersion forces operate as intermolecular attractive forces in CH₄. When atoms are in the second period, hydrogen-bonding attractive forces are stronger than dispersion forces. As a result, NH₃ has a greater boiling point than CH₄ does.

Stronger than non-polar bonding are polar bonds. Methane is a non-polar molecule because all of its C-H bonds are non-polar. Therefore, the methane molecules are being affected by the weak Vander walls force. However, since N-H bonds in ammonia are polar, the ammonia molecules are connected to one another by hydrogen bonds, making ammonia a polar chemical. Methane therefore has a lower boiling point than ammonia.

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The partial pressure of water vapor is found to be 166 mmHg.

To calculate the partial pressure of water vapor above the solution, we need to use Raoult's law which states that the vapor pressure of a component in a solution is proportional to its mole fraction in the solution.

First, we need to calculate the mole fraction of water in the solution:

Moles of water = 121 g / 18.015 g/mol = 6.71 mol

Moles of methanol = 59.6 g / 32.04 g/mol = 1.86 mol

Total moles = 6.71 mol + 1.86 mol = 8.57 mol

Mole fraction of water = moles of water / total moles = 6.71 mol / 8.57 mol = 0.782

Mole fraction of methanol = moles of methanol / total moles = 1.86 mol / 8.57 mol = 0.218

Now, we can use Raoult's law to calculate the partial pressure of water vapor above the solution:

Partial pressure of water = mole fraction of water * vapor pressure of water at that temperature

= 0.782 * 212. mmHg

= 166.1 mmHg

Therefore, the partial pressure of water vapor above the solution is 166.1 mmHg.  The answer is rounded to three significant digits, which gives us 166 mmHg.

"

Complete question

At a certain temperature the vapor pressure of pure water is measured to be 212. mmHg. Suppose a solution is prepared by mixing 121. g of water and 59.6 g of methanol (CH3OH) Calculate the partial pressure of water vapor above this solution. Be sure your answer has the correct number of significant digits Note for advanced students: you may assume the solution is ideal mmHg

"

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Histidine contains a amino group and a carboxylic acid group in its backbone and have an imidazole functional group in its side chain.

Histidine is classified as a semi essential amino acid needed in humans for growth and tissue repair. It plays a important role in immunity, gastric secretion. It is required for blood cell manufacture and protects tissues against damage caused by radiation and heavy metals. It is an alpha amino acid with an imidazole functional group. It forms complexes with many metal ions. It is a basic amino acid used to make up proteins in living things. Histidine plays important roles in the active site of enzymes such as serine proteases where it is a member of the catalytic triad. Excess of histidine converted to trans-urocanate by histidine ammonia lyase in liver and skin.

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The classification of each sample is pure element are shown in option A, C, and F, pure compound are shown in option D and I, mixture of an element and a compound are shown in option J, mixture of two elements are shown in option E and H, and mixture of two compounds are shown in option B and G.

Pure elements refer to substances that have one kind of atom. They have the same atomic number and one stable isotope as shown in the samples in option A, C, and F. A compound refers to a substance which is made up of two or more different chemical elements which are combined in a fixed ratio. A pure compound is composed of a particular set of molecules or ions that are chemically bonded as shown in the sample in option D and I.

Mixture comprises of two or more different elements and/or compounds which are physically intermingled. They can be separated into its components by physical means, and often retain many of the properties of its components. The mixture of an element and a compound are shown in option J, mixture of two elements are shown in option E and H, and mixture of two compounds are shown in option B and G.

Note: The question is incomplete. The complete question is attached.

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Taking into account the definition of Avogadro's Number, 1.355×10²⁴ atoms of Li in 2.25 moles

Avogadro's number refers to the number of elementary entities (ie, atoms, electrons, ions, molecules) that exist in one mole of any substance. That is, it is the number of particles in 1 mole of any substance (The mole is the unit of the International System of Units that allows to express a quantity of substance and one mole is equal to the number of atoms in twelve grams of pure carbon-12.)

The known approximate value of Avogadro's number is 6.023×10²³ particles per mole.

It can be applied the following rule of three: considering the definition of Avogadro's number if 1 mole of Li contains 6.023×10²³ atoms, 2.25 moles of Li contains how many atoms?

amount of atoms of Li= (2.25 moles × 6.023×10²³ atoms)÷ 1 mole

amount of atoms of Li= 1.355×10²⁴ atoms

Finally, there are 1.355×10²⁴ atoms of Li.

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The standard enthalpy of formation of a compound is the enthalpy change associated with the reaction that generates 1 mole of that compound from its component elements under standard conditions.

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation.

A pure element has a standard enthalpy of production of 0 in its normal state. The standard enthalpy change for any chemical reaction is equal to the sum of the standard enthalpies at which the products are formed less the sum of the standard enthalpies at which the reactants are formed.

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2.50 mL, 5.00 mL, and 7.50 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL. Option A

Step-by-Step approach:

The objective is to create a standard curve that represents the relationship between solution absorbance and dye concentration.

To create a standard curve, it is important to have a range of dilutions with different concentrations of the stock solution.

Option a) 2.50 mL, 5.00 mL, and 7.50 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL, provides a good range of dilutions.

This option allows for the creation of dilutions with different concentrations of the stock solution, which can then be plotted on the standard curve.

Option c) 3.00 mL and 5.00 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL, provides too limited of a range to create a useful standard curve.

Option b) 1.00 mL, 3.00 mL, 5.00 mL, and 7.00 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL, provides a good range of dilutions and is acceptable.

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If a solution has a pH of 7, this means that this is a solution of pure water. Therefore, the correct option is option C among all the given options.

pH is a numerical indicator of how acidic or basic aqueous or some other liquid solutions are. The phrase, which is frequently used during chemistry, biology, including agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per liter, to numbers between 0 through 14.

The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per liter, making it neutrality (neither acidic nor alkaline). If a solution has a pH of 7, this means that this is a solution of pure water.

Therefore, the correct option is option C among all the given options.

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The number of the molecules of water on the beach is 1.68 * 10^21 molecules.

We know that we can be able to obtain the Number of mass of the water molecules by the use of the equation that;

Density = mas/volume

Mass = Density * volume

Mass of the water = 0.05 g

Moles of the water molecules = Mass/ molar mass

= 0.05 g/18 g/mol

= 0.0028 moles

If 1 mole of the water would contain 6.02 * 10^23 molecules

0.0028 moles of the water molecules would contain 0.0028 moles *  6.02 * 10^23 molecules/1 moles

= 1.68 * 10^21 molecules

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The chemist should pour out 1763.28 mL of a 0.386 M aqueous silver nitrate stock solution. By rounding to three digits, the answer is 1763 mL.

Molarity (M) is defined as the number of moles of solute (n) divided by the volume (V) of the solution in liters. The molarity of a solution determines the concentration of the solution. This is very relevant in the chemist's process of making drugs.

The equation corresponding to molarity and volume is

M1×V1=M2×V2

To find V1,

V1=(M2×V2)/M1

Putting in the values,

(140 mM 775 mL) / 0.386 M = V1.

V1 = 1763.28 mL

As a result, the chemist should measure out 1763 mL of silver nitrate stock solution.

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Answer:

What is the molar mass of CuCl₂? 134,4524 gr/mol

How many moles are in 79.8 grams of CuCl₂? 0,5935 moles of CuCl₂

Explanation:

Atomic weight of each element:

Cu = 63.546  *  1 = 63.546 gr/mol

Cl₂ = 35.4532 * 2 = 70,9064 gr/mol

The molar mass of CuCl₂ = 63.546 gr/mol + 70,9064 gr/mol

The molar mass of CuCl₂ = 134,4524 gr/mol

[tex]79.8\,grams\, \,of\, \,CuCl_2*\frac{1 mol\,CuCl_2}{134.4524\,grams\,\,of\,CuCl_2} \approx 0,5935\,\, mol \,of \,CuCl_2[/tex]

The given white substances can be divided into two groups based on their solubility.

Ionic compounds potassium iodide, sodium chloride, and calcium carbonate are all strong electrolytes that conduct electricity well when dissolved. They all dissolve readily in water.

Citric acid, sucrose, and phenyl salicylate are weak or non-electrolytes. Sucrose is more soluble in water than the other two substances are in ethanol.

The chemicals could also be divided into groups according to whether they dissolve in water producing hydrogen ions, hydroxide ions, or neither, according to whether they have high or low melting temperatures, according to whether they are optically active. Chemical classifications are extremely useful; they are applied as necessary.

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Explanation:

Re-reading sections of the text or notes is a study habit, not one that is not a study habit for successful learning.

Because it is least ionic, CsI has the lowest melting point.

The temperature at which a substance transforms from a solid to a liquid is known as its melting point. The solid and liquid phases are in equilibrium at the melting point. Pressure affects a substance's melting point, which is typically reported at a standard pressure such 1 atmosphere or 100 kPa. Because it is least ionic, CsI has the lowest melting point. This is because its ionic nature is the weakest. Depending on the charge of the ions they are made of, ionic compounds typically have a high melting point. The cohesive forces and melting point increase with increasing charge levels. 

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