True or false: Properties that cannot be observed are due to the structure of atoms and molecules that can be observed.

Option A is correct which says when a liquid changes into a solid, the molecular motion decreases.

What is molecular motion?

The movement of its component atoms or molecules in a certain direction is referred to as molecular motion.

There is a decrease in the molecular motion when liquid moves towards a solid state. This is because the kinetic energy of the molecules decreases as molecules are moving from a less uniform space to a more uniform phase. As a result, molecular motion decreases.

Hence, option A is correct

To learn more about the molecular motion, check the given link

https://brainly.com/question/21669612

#SPJ13

In a mixture of 2 mol of barium chloride and 1 mol of potassium chloride, 5 moles of chloride ions are present.

Barium chloride

2BaCl₂ →  2 Ba⁺     +   4Cl⁻

2 moles   2 moles     4 moles

2 moles of barium chloride contain 4 moles of chloride ions.

Potassium chloride

KCl →   K⁺      +      Cl⁻

1 mole  1 mole     1 mole

1 mole of Potassium chloride contains 1 mole of chloride ions.

Thus, total mole chloride ions = 4+1

                                                  = 5.

In a mixture of 2 mol of barium chloride and 1 mol of potassium chloride, 5 moles of chloride ions are present.

To learn more about the mole concept refer,

https://brainly.com/question/22540912

Formerly employed in thermometers, mercury is a group 12 metal that is now recognized as toxic.

Only +2 ions (M +2 ions) with the configuration (n — 1)d 10 are formed by them. These are not true transition elements since the elements or ions they produce have fully filled (n — 1)d orbitals. They are, nevertheless, grouped with transition metals after forming their own group.

Examples of thermometers without mercury include liquid-in-glass thermometers and electronic digital thermometers. The platinum resistance thermometer is an illustration of an electronic digital thermometer. The thermistor and the thermocouple are more examples.

To know more about mercury visit:-

https://brainly.com/question/4025230

#SPJ1

Edible mushrooms: Consuming edible mushrooms is safe and provides health advantages like fiber, vitamins, and minerals.

Non-Edible mushrooms: Mushrooms that cannot be eaten could be harmful or have unappealing flavors and textures that could be harmful if consumed.

Answer:  16700 mmHg , 22,0 atm

Explanation:   1 torr  = 1 mmHg, so p = 16700 torr = 16700 mmHg

1 atm = 101325 Pa = 760 torr

16700 torr / 760 = 21,97 atm

Answer:

See explanation

Explanation:

The magnitude of electronegativity difference between atoms in a bond determines whether that bond will be polar or not.

If the electronegativity difference between atoms in a bond is about 1.7, the bond is ionic. If the electronegativity difference is greater than 0.4 and less than 1.7, the bond will have a polar covalent character. Lastly, if the electronegativity difference between the bond is less than or equal to 0.4, the covalent bond is non polar.

The electronegativity difference between carbon and hydrogen is about 0.4 which corresponds to a nonpolar covalent bond hence the molecule is nonpolar.

The electronegativity difference between carbon and fluorine is about 1.5 indicating a highly polar bond. This gives CH3F an overall dipole moment thereby making the molecule polar.

In pulmonary ventilation, the movement of gases is between the atmosphere and the alveoli of the lungs.

It is the process of inhalation and exhalation of air from the lungs. This happens because of the difference of pressure due to contraction and relaxation.

Inspiration occurs intrapleural cavity enlarges due to diaphragm's contraction which pulls it down. intrapleural cavity also occurs when ribs are elevated.

In  pulmonary ventilation, three different pressures are included; Atmospheric pressure, Interalveolar pressure, Intrapleural pressure.

The pressure outside the body is known as atmospheric pressure. Pressure inside the alveoli of the lungs is known Interalveolar pressure. The pressure in the  pleural cavity is known as Intrapleural pressure.

If you need to learn more about atmospheric pressure, click here

https://brainly.in/question/3554602

#SPJ4

The comparison between the results obtained from the ideal gas equation and the generalized compressibility chart can be made by calculating the relative difference: Relative Difference = |(V_ideal - V_chart) / V_ideal| * 100%

To determine the specific volume of nitrogen gas at 8 MPa and -132 °C, we'll use both the ideal gas equation and the generalized compressibility chart.

a) Using the ideal gas equation:

The ideal gas equation is given by:

PV = nRT

Where:

P is the pressure,

V is the specific volume,

n is the number of moles,

R is the ideal gas constant, and

T is the temperature in Kelvin.

First, we need to convert the pressure and temperature to Kelvin:

Pressure P = 8 MPa = 8 * 10^6 Pa

Temperature T = -132 °C = -132 + 273.15 K

Since we don't have the number of moles, we'll assume it to be 1 mole without loss of generality.

Now we can calculate the specific volume (V) using the ideal gas equation:

V = (nRT) / P

= (1 * R * T) / P

Substituting the values:

V = (1 * 8.314 J/(mol*K) * (-132 + 273.15) K) / (8 * 10^6 Pa)

≈ 0.04206 m^3/mol

Therefore, the specific volume of nitrogen gas at 8 MPa and -132 °C, according to the ideal gas equation, is approximately 0.04206 m^3/mol.

b) Using the generalized compressibility chart:

The generalized compressibility chart provides a way to determine the specific volume of a gas based on its reduced pressure (Pr) and reduced temperature (Tr). The reduced values are calculated by dividing the actual values by the critical values of the gas.

The critical temperature (Tc) for nitrogen is 126.2 K and the critical pressure (Pc) is 3.39 MPa.

To calculate the reduced values:

Pr = P / Pc = 8 MPa / 3.39 MPa

Tr = T / Tc = (-132 + 273.15) K / 126.2 K

Using the generalized compressibility chart, we can find the corresponding compressibility factor (Z) for the given Pr and Tr. The specific volume (v) can then be calculated using the equation:

v = Z * Vc / P

Where Vc is the molar volume at the critical point.

Based on the compressibility factor obtained from the chart, the specific volume can be calculated.

The comparison between the results obtained from the ideal gas equation and the generalized compressibility chart can be made by calculating the relative difference:

Relative Difference = |(V_ideal - V_chart) / V_ideal| * 100%

Substituting the values obtained from both methods, we can compare the results.

Learn more about ideal gas equation from the given link!

https://brainly.com/question/27870704

#SPJ11

The mass number is the atomic mass rounded to a whole number.

The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons  as well as neutrons in an atomic nucleus however if it is  approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.

It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.

Learn more about mass number at:

https://brainly.com/question/12184564

#SPJ1

It is important to maintain equivalent proportions of reagents in the synthesis of methyl salicylate by aldol condensation for several reasons; To achieve maximum yield, avoid side reactions, and control the reaction rate.

To achieve maximum yield; The aldol condensation reaction is a reversible reaction, and the yield of the product is dependent on the concentrations of the reactants. If one of the reactants is present in excess, it will not participate fully in the reaction, leading to a lower yield of the product.

To avoid side reactions; The aldol condensation reaction is a multi-step reaction, and if the reactants are not present in equivalent proportions, it can lead to side reactions, such as the formation of unwanted by-products. These by-products can reduce the yield of the desired product and complicate the purification process.

To control the reaction rate; The rate of the aldol condensation reaction is dependent on the concentrations of the reactants. If one of the reactants is present in excess, it can increase the reaction rate, leading to the formation of undesired products.

To know more about  methyl salicylate here

https://brainly.com/question/28571674

#SPJ4

Answer:

Explanation:

The first thing to do is to write out the chemical equation showing the reaction between the two chemical compounds.

C2H4 + HBr ------------------------> C2H5Br.

The chemical species/compounds reacted in the ratio of 1 : 1 : 1. That is one mole of C2H4 reacted with one mole of HBr to give one mole of C2H5Br.

So, we are given; C2H5Br = 58.7 mol%, HBr = 18.3 mol%. Thus, for C2H4, we have [ 100 - (58.7 + 18.3)] = 23 mol%. Therefore, the limiting reagent is HBr.

So, if we have 100 mol/s ;

C2H5Br = 100 × 0.587 = 58.7 mol/s, HBr = 100 × 0.183 = 18.3 mol/s and C2H4 = 100 × 0.23 = 23 mol/s.

Therefore, the total value of the flow rate in the feed = (HBr in feed) mol/s + (C2H4 in feed) mol/s = (58.7 + 18.3)mol/s + (58.7 + 23) mol/s =( 77 + 81.7) mol/s = 158.7 mol/s. .

So, 100/158.7 × 30.5 = 192.2.

Also the feed composition in HBr and C2H4 is;

HBr = 77/158.7 = 0.4852, C2H4 = 81.7/158.7 = 0.515.

Therefore, the number of HBr in feed and C2H4 in feed = 160m/s and 200m/s respectively (approx.)

Therefore, the fraction conversion is;

Answer:Flame tests are used to help identify substances used in murders

Explanation:

Answer:

I think true

Explanation:

The relationship in which one species kills and consumes another species is known as predation.

Predation is an essential component of ecosystems, influencing not only the predator and prey but also the surrounding environment and other organisms in the food web.Predation is widespread in nature and is found in all major taxa, including bacteria, fungi, plants, and animals.

As a result, predation affects all levels of the food web, from primary producers to apex predators.Predators are classified as carnivores, meaning they feed on other animals, and herbivores, which feed on plants. Some predators are generalists, meaning they eat a wide variety of prey, while others are specialists, feeding on a specific type of prey. The type of predator often determines the hunting strategy, such as ambush, pursuit, or scavenging.

The prey is classified as either active or passive defenses. Active defenses are those that involve the prey moving or taking some other action to avoid being eaten, such as fleeing or hiding. Passive defenses are those that do not require any action on the part of the prey, such as cryptic coloration or chemical defenses.

When predators are introduced to an ecosystem, they can have a significant impact on the prey population and the surrounding environment. Predators can reduce the number of prey, which can lead to a cascade of effects through the food web.

For more such questions on relationship visit:

https://brainly.com/question/23277752

#SPJ8

The skin's acid mantle, formed by sebum with high fatty acid content and acidic pH, acts as a barrier against microorganisms, preventing their growth and maintaining a healthy skin ecosystem.

The skin's acid mantle provides protection against microorganisms due to the presence of sebum, which has high fatty acid content and an acidic pH. Sebum creates an unfavorable environment for the growth of many bacteria, fungi, and other pathogens, acting as a physical and chemical barrier. The fatty acids present in sebum have antimicrobial properties that can inhibit the growth and survival of microorganisms. Additionally, the skin's acidic pH, typically ranging from 4 to 6, creates an inhospitable environment for many pathogens. This acidic pH helps to maintain the natural microbiota balance on the skin, preventing the overgrowth of harmful microorganisms. Together, sebum production and the skin's acidic pH contribute to the protective barrier function of the skin, helping to prevent infections and maintain a healthy skin ecosystem.

learn more about skin's acid here:

https://brainly.com/question/25148363

#SPJ11

Because of our belief in the law of conservation of mass, it seems reasonable that matter cannot be created or destroyed, only changed in form or transferred from one substance to another.

This law is fundamental to our understanding of the physical world, and it has many practical applications in fields like chemistry, physics, and engineering. It helps us to predict the outcomes of chemical reactions, to balance equations, and to understand the behavior of materials under different conditions.

The law of conservation of mass is a fundamental principle that underlies much of what we know about the world around us, and it will continue to play an important role in scientific research and development for years to come.

More on  law of conservation of mass: https://brainly.com/question/28711001

#SPJ11

Answer:

0.04506 mol

Explanation:

For this problem, you need to convert grams to moles.  To do this, you need the molar mass, which is given.  Divide the mass by the molar mass to find the moles you have.

(5.001 g)/(110.98 g/mol) = 0.04506 mol

According to the graph, the concentration of A decreases with time before leveling out. Option A.

The reaction shown is that of a reversible reaction in which A is on the reactant's side and A2 is on the product's side.

At the beginning of the reaction, the concentration of A decreases as a result of forming A2. In other words, the concentration of A2 increases just as that of A decreases.

With time, the reaction reaches an equilibrium during which the rate of formation of A equals the rate of formation of A2. At this point, the concentration of A levels off.

In summary, the concentration of A first decreases before leveling off.

More on reversible reactions can be found here: https://brainly.com/question/31950205

#SPJ1

The key differences between the Articles of Confederation and the U.S Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

The document created the better system of government for the new nation is the US constitution.

The Article of confederation , the state have stronger power than the central power and in the US constitution , the power of central government is stronger than the states. The important development was the establishment of three departments. There are three departments of government that is legislative , executive and judicial.

Thus, The key differences between the Articles of Confederation and the U.S. Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

To learn more about US Constitution here

https://brainly.com/question/29027032

#SPJ1

... I hope this helps

True

Answer:

True

Explanation:

Beacuse you use Fossil Fuels for gas and its oil as well

The IR spectrum of Acetylferrocene will differ from that of Ferrocene because of the carbonyl stretching and bending modes that appear in the Acetylferrocene.

The IR spectrum of Acetylferrocene will differ from that of Ferrocene due to the carbonyl stretching and bending modes that appear in the Acetylferrocene.

Ferrocene and Acetylferrocene have similar IR spectra since they both have the Fe-Cp stretching and bending modes. The acetyl group of Acetylferrocene is reflected by an intense band in the 1700-1750 cm-1 range, which is due to carbonyl stretching.

                                     In Acetylferrocene, the IR spectra are dominated by the presence of the acetyl group's vibration, resulting in a change in the frequency of stretching vibration from 200 to 220 cm−1. Another change in the IR spectra of Acetylferrocene is the presence of two bands due to C-O stretching at 1230-1260 cm-1 in addition to the appearance of a strong band due to C-H bending vibrations in the 1410-1450 cm-1 region.

                           Ferrocene does not have a carbonyl group, which is why it will not display the carbonyl stretching and bending vibrations in the IR spectra. This is the most significant difference between the two IR spectra. So, we can conclude that the IR spectrum of Acetylferrocene will differ from that of Ferrocene due to the presence of the carbonyl group.

Therefore,  The IR spectrum of Acetylferrocene will differ from that of Ferrocene because of the carbonyl stretching and bending modes that appear in the Acetylferrocene.

Learn more about Acetylferrocene

brainly.com/question/31787348

#SPJ11

Answer:

Radical is a charged ion

the types are cation and anion.

cation is positively charged and anions are negatively charged

Explanation:

Answer:

more genetic variation within a population usually enables more phenotypic variation.

Explanation:

Because natural selection acts directly only on phenotypes,  Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.

Genetic variation lets the organisms survive long term as it increases the phenotypic and the genotypic variation.  Genetic variation is due to the type of reproduction that involves two parents.

Genetic variation is the modification of the original genome of the organism by genetic recombination and mutation that can be beneficial in the survival and the natural selection process.

Reproduction involving two parents of the same species allow genetic variation as the process of independent assortment and crossing over of the chromosomes inherited from both creates species with different traits and genotype.

Therefore, the reproduction involving two parents results in genetic variation.

Learn more about genetic variation here:

https://brainly.com/question/20665733

#SPJ2

Option (b) is correct. Amides are the derivative of amines and carboxylic acids.

Amides are the derivatives of carboxylic acid and amines. A carboxylic acid contains the  −COOH  functional group, and in an amide the  −OH  part of that group is replaced by an  −NH2  group. So, amides contain the  −CONH2  group. Any member of either of two classes of nitrogen-containing compounds related to ammonia and amines. The covalent amides are neutral or very weakly acidic substances formed by replacement of the hydroxyl group (OH) of an acid by an amino group NR2, in which R may represent a hydrogen atom or an organic combining group such as methyl, CH3. Among the amides of commercial importance are acetamide and dimethylformamide HCON(CH3)2, which are used as solvents, the sulfa drugs, and the nylons.

To learn more about Amides please visit:

https://brainly.com/question/11622057

#SPJ4

The pH of a solution of sulphuric acid that has hydronium ion concentration is 4.26.

pH of any solution is define as the negative logarithm of the concentration of H⁺ ion present in any solution, i.e.

pH = -log[H⁺]

In the question, it is given that:

Concentration of hydronium ion or H⁺ ion = 5.45×10⁻⁵ M

So, pH will be:
pH = -log(5.45×10⁻⁵)

pH = -(-4.26)

pH = 4.26

Hence required pH is 4.26.

To know more about pH, visit the below link:

https://brainly.com/question/172153

Answer:

a

barium

b

calcium

e

aluminum

f

magnesium

g

copper

Forms cation

Explanation:

The following chemical weathering process that is responsible for the breakdown of most silicate minerals is E. hydrolysis.

Hydrolysis is a chemical reaction between water and minerals that form new compounds. In this process, water breaks down the minerals, and the hydrogen ions (H⁺) and hydroxide ions (OH⁻) from the water combine with the mineral ions, forming new minerals.

Hydrolysis is an important process in the breakdown of silicate minerals, which are the most abundant minerals in the Earth's crust. The process is responsible for the formation of clay minerals, which are important components of soils and sediments. In summary, hydrolysis is the most significant chemical weathering process that breaks down most silicate minerals. So the correct answer is E. hydrolysis  is responsible for the breakdown of most silicate minerals.

Learn more about hydrolysis at:

https://brainly.com/question/2854217

#SPJ11