Which of the following statements correctly describes density?

Answer: C. Biochemistry

Explanation:

Merriam-Webster Dictionary defines Biochemistry as:

"chemistry that deals with the chemical compounds and processes occurring in organisms"

“Definition of BIOCHEMISTRY.” Merriam-Webster.com, 2018,   www.merriam-webster.com/dictionary/biochemistry.

The arrows B, C, and E represent the process of cooling.

Solid state: In the solid state, the molecules are arranged in a regular and fixed pattern. The molecules in a solid are closely packed that is the solid particles can not move.

Liquid state: In the liquid state, the molecules are present in an irregular pattern. The molecules are closely packed but particles can move.

Gaseous state: In the gaseous state, the molecules are present in an irregular manner. The molecules of gases are not closely packed and can move freely.

Therefore, the solid changes to liquid on heating, and the liquid changes to solid after cooling.

Liquid changes to a gaseous state on heating while gases changes to liquid on cooling.

Solid changes to gas on heating and gases change to solid after cooling.

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The mass of H₂s present in 2.00 L of natural gas at 298 K is 0.002156 g.

The volume hydrogen sulfide in 2.00 L of natural gas at 298 K is calculated as follows:

Volume of hydrogen sulfide = percent composition * volume of natural gas

Volume of hydrogen sulfide = 0.07/100 * 2.00 L

Volume of hydrogen sulfide = 0.014 L

The given temperature is standard temperature.

Density of H₂s at STP is equal to 1.54 g/L.

mass of H₂s = density * volume

mass of H₂s = 0.0014 * 1.54

mass of H₂s = 0.002156 g

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Answer:

88.63494750000001

Explanation:

Convert moles Gold to gram.

The correct answer is  a sphybridisation in z coordinate.So to form sphybridisation we need a s orbital and a p orbital  .

In genomics, hybridization is the process by which two complementary single-stranded DNA or RNA molecules bond together to form a double-stranded molecule.The bonding is determined by the correct base pairing between the two single-stranded molecules. When one s and one p orbital in the same main shell of an atom combine to form two new equivalent orbitals, this is referred to as sphybridization.

The newly formed orbitals are known as sphybridized orbitals. It forms linear molecules with a 180° angle. Atomic orbitals include both s and p orbitals. These orbitals represent the most likely region in which we can find an electron of that atom. The primary distinction between s and p orbitals is that s orbitals are spherical in shape, whereas p orbitals are dumvell-shaped.So to form  sp hybridisation we need a s orbital and a  p orbital .

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The true statement about a molecule is that all molecules of a compound have the same properties and is therefore denoted as option C.

This is referred to as the smallest unit of matter without the release of electrically charged particles which include proton, electron etc.

Atoms combine together to form molecules and they are involved in the formation of chemical compounds such as NaCl etc. It consists of identical molecules which means that all of them have the same properties which is therefore the reason why option C was chosen as the most appropriate choice.

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Answer:

All molecules of a compound have the same properties.

Explanation:

An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.

The mass of an atom is mainly due to its protons and neutrons in the nucleus.

Weight of a proton is 1.6 x 10^-27 kg

Weight of a neutron is 1.6 x 10^-27kg

However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu

A chlorine atom has 17 protons in its nucleus and 18 neutrons in its nucleus

Its atomic number is 17

Amu weight of Cl= weight of protons+ weight of neutrons

        =17+18

        =35amu

Hence the average atomic mass unit of chlorine atoms will be 35 amu

Disclaimer:

The value is taken for easier calculation and is not accurate upto 3 decimals

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All processes for which the temperature stays constant are described by Boyle's law.

Boyle's law is expressed as p1 * V1 = p2 * V2, where p1 and V1 are starting pressure and volume, respectively. The ultimate values of these gas parameters are p2 and V2.

Boyle's law formula can be stated in a variety of ways, depending on the parameter we want to estimate. Let's imagine we wish to determine the pressure that results from changing a gas' volume under isothermal conditions. The Boyle's law equation thus reads: p2 = p1 * V1 / V2 or p2 / p1 = V1 / V2.

As we can see, the final-to-initial pressure ratio is the opposite of the volume ratio.

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When this occurs the result that is obtained from the calculation would no longer be trustworthy because it is above the actual value.

We know that evaporation involves the heating a sample of a substance until all the water in it leaves and it remains only the crystalline solid. The whole water would evaporate and the mass of the sample would decrease.

When the student accidentally drops the watch glass atop the evaporating dish containing the dried salt and it breaks, the particles of the glass would mix with the dried salt and increase the mass of the dried salt.

When this occurs the result that is obtained from the calculation would no longer be trustworthy because it is above the actual value.

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Answer:

ddddxddddddddddddddddddddddddd

Magnesium is not a good conductor. Hence, the conductivity of magnesium is not good.

Magnesium is placed in group 2 of the periodic table. It has 2 valence electrons which are in the fully filled s-subshell. When the subshell is fully filled, the electrons are not available to move to conduct. For example, group 1 has half filled subshell which allows the electrons to move.

But, how does magnesium conduct? As its subshell is fully filled and therefore no electrons are available to move.

In group 2 metals, there is a property called s-p hybridization. The s- and p- subshells overlap so that metals can now move to the unfilled states of the p-subshell.

Hence, magnesium is not a good conductor.

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Explanation:

though the statements were not given let just give you a brief review of normative system.

A normative statement explains what should be base of the subject according to the belief through valued judgement that describes the fairness of the subject on public policy. Therefore, the unemployment rate should be lowered is a valued judgement based on the belief that it will bring economic welfare.

Normative systems, i.e., sets of norms, have two main. tions: a) to evaluate human actions, and b) to guide peop. The guidance and the evaluation based on a normativ. be good or bad.In social psychology three different normative behaviours have been identified: obedience, conformity and compliance.In the context of a normative system like law (or religion or morality), every statement of what one ought to do (or ought not to do) requires justification from a more general or basic statement. Such statements lead upward through the normative hierarchy until one reaches a foundational normative premise.

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Taking into account the reaction stoichiometry ,CuCl₂ is the limiting reagent and the theoretical yield of copper produced is 0.2363 grams.

In first place, the balanced reaction is:

2 Al + 3 CuCl₂ → 3 Cu + 2 AlCl₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 54 grams of Al reacts with 403.32 grams of CuCl₂, 0.5 grams of Al reacts with how much mass of CuCl₂?

mass of CuCl₂= (0.5 grams of Al× 403.32 grams of CuCl₂)÷ 54 grams of Al

mass of CuCl₂= 3.734 grams

But 3.734 grams of CuCl₂ are not available, 0.5 grams are available. Since you have less mass than you need to react with 0.5 grams of Al, CuCl₂ will be the limiting reagent.

The theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 403.32 grams of CuCl₂ form 190.62 grams of Cu, 0.5 grams of CuCl₂ form how much mass of Cu?

mass of Cu= (0.5 grams of CuCl₂× 190.62 grams of Cu)÷ 403.32 grams of CuCl₂

mass of Cu= 0.2363 grams

Then, the theoretical yield of copper produced is 0.2363 grams.

In summary, you obtain:

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Considering the definition of STP conditions, you obtain:

A. 44 grams of N₂ will ocupy at STP 35.168 L.

B. 0.25 moles of NH₃ will ocupy at STP 5.6 L.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

In this case, you have:

You can apply the following rule of three to know the number of moles of N₂: if 28 grams of the compound are contained in 1 mole, 44 grams are contained in how many moles?

number of moles of N₂= (44 grams× 1 mole)÷ 28 grams

number of moles of N₂= 1.57 moles

Now, you can apply the following rules of three to know the volume of N₂ and NH₃:

volume of N₂= (1.57 moles× 22.4 L)÷ 1 mole

volume of N₂= 35.168 L

volume of NH₃= (0.25 moles× 22.4 L)÷ 1 mole

volume of NH₃= 5.6 L

Finally, you obtain:

A. 44 grams of N₂ will ocupy at STP 35.168 L.

B. 0.25 moles of NH₃ will ocupy at STP 5.6 L.

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The energy of an electromagnetic wave that has a wavelength of 4.2nm is 4.731 × 10-¹⁷ J.

The energy of a wave can be calculated using the following formula:

E = hf

Where;

However, the frequency must be calculated first as follows:

λ = v / f

Where;

4.2 × 10-⁹ = 3 × 10⁸/f

f = 7.14 × 10¹⁶Hz

Energy = 6.626 × 10-³⁴ × 7.14 × 10¹⁶

Energy of the wave = 4.731 × 10-¹⁷ J

Therefore, the energy of an electromagnetic wave that has a wavelength of 4.2nm is 4.731 × 10-¹⁷ J.

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According to postulates of the Dalton's atomic theory, atoms of same element are identical in all respects i.e., in shape, size, mass and chemical properties. However, after the discovery of isotopes, it was modified as : atoms of same element may not be similar in all respects

The empirical formula of the carboxylic acid is C₃H₆O₂.

For determination of the empirical formula of the carboxylic acid.

As you know, one mole of water, contains 2 moles of hydrogen. This means that the percent composition of hydrogen in water will be

2× 1.00794 g/mol / 18.015 g/mol × 100 = 11.19% H

What this means is that every 100 g of water will contain  11.19 g of hydrogen. In your case, the 0.2349-g  sample of water will contain  

0.2349 g water⋅ 11.19 g H / 100 g water = 0.026285 g H

Similarly, one mole of carbon dioxide, CO₂, contains one mole of carbon. The percent composition of carbon in carbon dioxide will be

1 ×12.011 g/mol / 44.01 g/mol × 100 = 27.29% C

Once again, this tells you that every 100 g of carbon dioxide will contain

27.29 g of carbon. In your case, you will have

0.5706g H₂O ⋅ 27.29 g C /100g H₂O = 0.15572 g C

The mass of carbon + hydrogen originally present in the carboxylic acid sample will be

m C + H = 0.026285 g + 0.15572 g =0.18201 g

The initial mass of the sample was equal to 0.3200 g. This tells you that the sample also contains oxygen

m oxygen = 0.3200 g −0.18201 g = 0.13799 g O

So, now that you know how many grams of each element were present in the initial sample, use their molar masses to convert these to moles

For C: 0.15572g /12.011g/mol = 0.012965 moles C

For H:  0.026285 g/1.00794g/mol = 0.026078 moles H

For O:  0.13799g/15.9994g/ mol = 0.0086247 moles O

Now, to get the compound's empirical formula, you need to find the smallest whole number ratio that exists between the number of moles of each element in the compound.

To do that, divide these values by the smallest one to get

For C:  0.012965 moles / 0.0086247 moles = 1.5032 ≈ 1.5

For H: 0.026078moles /0.0086247 moles =3.0236≈ 3

For O:  0.0086247moles /0.0086247 moles = 1

This means that you have

C₁.₅H₃O₁

Since you're looking for the smallest whole number ratio that exists between the elements, multiply each subscript by 2 to get

C₁.₅H₃O₁ * 2 = C₃H₆O₂

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The mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL  is 37.5g.

Density is the measurement of quantity or mass per unit of volume in a particular substance. Its units are  grams per centimeters cube (g/cm³) or kilograms per liter (kg/l)

⇒  g/cm³ can also be written as g/mL because 1cm³ = 1mL

Volume is a measure of space. When measuring the volume of a liquid which is sometimes referred to as capacity, the units liters (L) and milliliters (mL) are used.

Mass is defined as amount of matter present in a body. Gram (g) and kilogram (kg) are the common units.

density = mass / volume

mass = density × volume

         =  2.5 g/mL  ×  15 mL.

         =  37.5 g

Since density is given in g/mL and volume is given in mL, we can keep the unit of mass in grams (g).

Thus we can conclude that the mass of liquid is 37.5g

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The mass (in grams) of 10.00 L of propane vapor ([tex]C_3H_8[/tex]) at STP is 19.668 g

One mole of gas requires 22.4 L of space at STP.

Moles of[tex]C_3H_8[/tex] = 10.0L/22.4L = 0.446 mol

Mass of [tex]C_3H_8[/tex] = 0.446×44.1 = 19.668 g

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Answer:

see bellow..

Explanation:

a) independent variable ; the specific scents being used (like vanilla, or blueberry etc.)

b) how much of it is sprayed

c) the weather,  brand of perfume, record time

Answer: The same answer

Explanation: I believe atomic mass should remain the same regardless of the amount of substance you have. Carbon for example has an atomic mass of 12. Regardless of if you have 1 mole or 120 moles of Carbon, it is still a mass of 12.

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There are 4 orbitals in the principal energy level two. These are: one 2s orbitals and three 2p orbitals (2px, 2py and 2pz).

Principal energy level indicates the energy shell outside the nucleus in which an electron is located. There are 4 principal energy levels. These are:  s (sharp), p (principal), d (diffuse) and f (fundamental). The principal energy level can be denoted by the letter n.

Orbital is a function. It describes the behavior and the location of an electron in an atom. The orbitals for any energy level are calculated using the formula n² (where n is the number of orbitals). Hence for energy level 2, the number if orbitals = 2² = 4. Now s has only one orbitals and p has three, therefore a total of four orbitals.

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Answer:

42

Explanation:

miles per gallon = kilometers per liter × 2.35

When a neutral molecule is exposed to a solution, it splits into charged ions, which is known as ionization. The degree of ionization of acids and bases is determined by the degree of dissociation of compounds into their constituent ions. Strong acids and bases have a higher degree of ionization than weak acids and bases.

The Ionisation degree denotes the strength of an acid or a base. A strong acid is said to completely ionize in water, whereas a weak acid is said to ionize only partially. Because there are different degrees of acid ionization, there are also different levels of weakness, which can be expressed quantitatively.

Ionization of these bases results in the formation of hydroxyl ions (OH). As a result, the degree of ionization of acids and bases is determined by the degree of dissociation of compounds into their constituent ions. Strong acids and bases have a high degree of ionization when compared to weak acids and bases.

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Answer:

you can do it shshbssjjsjsnsjssbsjsb

Explanation:

taking atom as hydrogen than

answer is +2.55

just apply Delta energy=energy in 4th orbit -energy in 2nd orbit

[tex]energy = - 13.6 \times z ^{2} \div n {}^{2} [/tex]

so here you can find answer