60. What is surface tension, and what conditions must exist
for it to occur?

Answer:

3) 9.1 x 10^3 J

Explanation:

The chemical's IUPAC names of the given compound are propanal and acetone.

IUPAC is the international union of practical and applied chemistry. It set rules for standard naming of the compound.

Propanal, or propanaldehyde, is an aldehyde that has one double bond and one oxygen atom.

Acetone is a kind of ketone. Ketones have the functional group R2CO.

Thus, chemical's IUPAC names of the given compound are propanal and acetone.

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Answer:

Virus is living due to reproduction and non-living due to crystal appearance.

Explanation:

Characteristics that viruses display is the ability of reproduction in which they increase in population which is a living character and have DNA or RNA which help them to make exact copies of itself. Virus is parasitic in nature because it causes harm to the living host such as humans, animals and plants. Some characteristics that viruses don't display are that they are not like living cells, have no membrane around them, no organelles such as mitochondria, golgi bodies, endoplasmic reticulum and lysosomes etc. Viruses are present in crystal form outside the cell.

Answer:

Hello There!!

Explanation:

I believe the answer is O They form compounds with very bright colors.

hope this helps,have a great day!!

~Pinky~

The statement about noble gases that is correct is D. They form compounds with very bright colors.

Noble gases simply refers to the elements that have similar properties. Noble gases are colorless, odorless, and have very low reactivity.

Examples of noble gases are helium, argon, Krypton, xenon, etc. Noble gases also form compounds with very bright colors.

In conclusion, the correct option is D.

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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, the compound formed using element X and Z is X \(_O\)Z●.

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. The compound formed using element X and Z  with their respective atoms is  X \(_O\)Z●. Atoms are written on the foot of the element.

Therefore, the compound formed using element X and Z is X \(_O\)Z●.

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am not sure

Explanation:

1T

2T

3T

4F

5F

6F

7F

8T

9T

10T

The extremophile that has evolved in conditions of extreme drought is the xerophile, while the extremophile that has evolved in conditions of extreme salt is the halophile.

Extremophiles are organisms that thrive in extreme environments, where most other life forms cannot survive. They have developed unique adaptations to withstand and thrive in these extreme conditions. Two types of extremophiles specifically adapted to different extreme environments are xerophiles and halophiles.

Xerophiles are extremophiles that have evolved to survive in conditions of extreme drought. They are adapted to environments with very low water availability or high water stress. These organisms have developed mechanisms to prevent water loss, such as efficient water retention and protection of cellular structures. Xerophiles can be found in desert environments and other arid regions.

On the other hand, halophiles are extremophiles that have evolved to live in conditions of extreme salt concentration. They are adapted to environments with high salinity, such as salt flats, salt lakes, and hypersaline environments. Halophiles have specialized adaptations to cope with the osmotic stress caused by high salt concentrations. They have enzymes and transport proteins that function in high-salt environments and can maintain osmotic balance within their cells.

In summary, xerophiles have evolved in conditions of extreme drought, while halophiles have evolved in conditions of extreme salt. These extremophiles showcase remarkable adaptations to thrive in their respective harsh environments.

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The temperature from the metal is transferred to water. Hence the heat lost by the metal is equal to the heat gained by water. Then using calorimetric equation, mass of gold is , 353.8 g.

Calorimetry is an analytical technique used to determine the heat energy absorbed or evolved by a system. The calorimetric equation relating the heat energy q with the mass m, specific heat c and the temperature difference ΔT is :

q = m c ΔT

Here, the heat energy absorbed by water in the calorimeter is equal to the heat evolved from the hot gold metal.

given c of gold = 0.130 J/°C g

c of water = 4.12 J/°C g

temperature difference for water = 45- 20 °C = 25°C

thus, 25°C is lost from the metal.

Then, Mg × 0.130 J/°C g × (150 -25°C ) = 50 g × 4.12 J/°C g × 25°C

then Mg = 353.8 g.

Therefore, mass of gold is 353.8 g.

In similar way, we can find the final temperature of the second system if all other quantities are given.

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The statement "The citric acid cycle is classed as a reductive pathway as it produces reduced electron carriers" is true.

The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid cycle, is a central metabolic pathway in cellular respiration. This pathway generates reduced electron carriers, specifically NADH and FADH2, which are essential for the production of energy through the electron transport chain.

In the citric acid cycle, acetyl-CoA, derived from carbohydrates, fats, or proteins, is combined with oxaloacetate to form citrate. Through a series of enzyme-catalyzed reactions, citrate is then converted back to oxaloacetate, releasing two molecules of carbon dioxide and generating three molecules of NADH, one molecule of FADH2, and one molecule of ATP or GTP. The reduced electron carriers, NADH and FADH2, transport high-energy electrons to the electron transport chain, where they ultimately contribute to the production of ATP via oxidative phosphorylation.

In conclusion, the citric acid cycle is indeed a reductive pathway as it produces reduced electron carriers, NADH and FADH2, which are crucial for cellular energy production. This pathway is a key component of cellular respiration and plays an essential role in generating energy for various cellular processes.

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Answer:

B is the outer part atom .

The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). The atoms have different properties based on the arrangement and number of their basic particles.SO the hydrogen atom (H) contains only one proton, one electron, and no neutrons

Explanation:

Answer:

A titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution. Typically, the titrant (the know solution) is added from a buret to a known quantity of the analyte until the reaction is complete

A buffer is made from an acid - base conjugate pair as shown by option A

Buffers are often composed of weak acids and their conjugate bases (or weak bases and their conjugate acids). The weak acid can contribute a proton to balance any new base, whereas the conjugate base can absorb a proton to do so.

This balance between the acid and its conjugate base allows the buffer to survive pH changes. Buffers are essential in biological systems because many biochemical processes are particularly sensitive to pH changes.

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Answer:

true

Explanation:

3/  a. Selenium, Copper, Scandium

 b. Oxygen, Sulfur, Polonium

 c. Rubidium, Cesium, Francium

4/ a. Arsenic, Germanium, Gallium

 b. Beryllium, Calcium, Barium

 c. Calcium, Cadmium, Iridium

5/  a. Platinum, Nickel, Copper

 b. Silver, Actinium, Phosphorous

 c. Tungsten, Astatine,  Mercury

Explain: the nuclear charge is shielded by inner closed shells that are complete. The valence electrons are also farther removed from the nuclear core, and thus, even tho the nuclear charge has increased, the attraction for the valence electrons should be DECREASED, and this is manifested by the well-known decrease in ionization enthalpies as we go down a Group, a column of the Periodic Table. And thus down the Group, electronegativity decreases.

Answer:

3. IN ORDER OF HIGHEST TO LOWEST

  a. Selenium, Copper, Scandium

  b. Oxygen, Sulfur, Polonium

  c. Rubidium, Cesium, Francium

4. IN ORDER OF HIGHEST TO LOWEST

  a. Arsenic, Germanium, Gallium

  b. Beryllium, Calcium, Barium

  c. Calcium, Cadmium, Iridium

5. IN ORDER OF LARGEST TO SMALLEST

  a. Platinum, Nickel, Copper

  b. Actinium, Silver, Phosphorous

  c. Tungsten, Mercury, Astatine

Explanation:

Could you please give me brainliest for this question cause it took a while to do?

The species present in the largest amount in an aqueous solution of acetic acid is water molecules.

In an aqueous solution of acetic acid (CH3COOH), the species present in the largest amount is water molecules (H2O). This is because acetic acid is a weak acid and does not completely dissociate in water, resulting in a relatively small number of acetate ions (CH3COO-) and protons (H+).

                   Water molecules, being the solvent, are present in a significantly larger quantity compared to the other species in the solution.

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The empirical formula of the compound is \(CH_2\)

The amount of C and H present in 100 g of the compound are 86 g and 14 g respectively. Option A.

To determine the empirical formula of polyethylene, we first need to find the ratio of carbon to hydrogen atoms in the compound.

Assuming 100.0 g of polyethylene, we can convert the percentages to masses:

Mass of carbon = 86.0% * 100.0 g = 86.0 g

Mass of hydrogen = 14.0% * 100.0 g = 14.0 g

Moles of carbon = 86.0 g / 12.01 g/mol = 7.163 mol

Moles of hydrogen = 14.0 g / 1.008 g/mol = 13.889 mol

Carbon:Hydrogen = 7.163 mol : 13.889 mol

Therefore, the empirical formula of polyethylene is CH2.

Since the compound is 86% C and 14% H, the amount of C and H present in 100 g of the compound would be 86 g and 14 g respectively.

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Answer:

nnaaoooo sseeiiiiii!!!!!!!!!

a. NH3 (Ammonia): In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted.

b) 1.0L container of CHCl3 at STP, dipole-dipole interactions (along with London dispersion forces) would be present.

a. NH3 (Ammonia):

In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted. Ammonia (NH3) molecules consist of one nitrogen atom bonded to three hydrogen atoms, forming a trigonal pyramidal shape.

Hydrogen bonding is a type of intermolecular force that occurs when a hydrogen atom is covalently bonded to an electronegative atom (in this case, nitrogen) and interacts with another electronegative atom (in this case, the nitrogen atom of a neighboring NH3 molecule).

b. CHCl3 (Chloroform):

In a 1.0L container of CHCl3 (chloroform) at STP, intermolecular forces such as dipole-dipole interactions would be exerted. Chloroform (CHCl3) molecules consist of one carbon atom bonded to three hydrogen atoms and one chlorine atom, forming a tetrahedral shape.

Dipole-dipole interactions arise due to the difference in electronegativity between chlorine and hydrogen atoms. The chlorine atom is more electronegative than hydrogen, resulting in a polar covalent bond.

While dipole-dipole interactions are present in CHCl3, it is worth noting that CHCl3 also exhibits London dispersion forces. These forces occur due to temporary fluctuations in electron distribution, creating temporary dipoles.

London dispersion forces are the weakest type of intermolecular force but still contribute to the overall intermolecular interactions in CHCl3.

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(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer:

Mitochondria -uses glucose!!

Explanation:

An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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Answer: Rising temperatures can lead to deadly pathogens in freshwater sources, making the water dangerous for people to drink. Contaminated water poses a huge threat to children's lives. Water and sanitation-related diseases are one of the leading causes of death in children under 5 years old

Explanation:

The term that is NOT a feature of the chemical defense system of bombardier beetles is "The Red Queen Hypothesis."

The Red Queen Hypothesis is a concept in evolutionary biology unrelated to the beetles' chemical defense system. The other options describe various aspects of bombardier beetles' defense system or consequences of it, but The Red Queen Hypothesis does not.

This hypothesis states that organisms must constantly adapt and evolve in order to survive in an ever-changing environment, but it is not related to the chemical defense system of bombardier beetles.

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form calcium hydroxide and hydrogen gas

Ca + 2H₂O ⇒ Ca(OH)₂ +H₂

The major 1,2- and 1,4-addition products formed when a diene reacts with HBr are as follows:

1. For the 1,2-addition product: The diene reacts with HBr, and one of the double bonds undergoes addition with the hydrogen of HBr at the 1,2-position. This results in the formation of a monosubstituted alkyl bromide.

2. For the 1,4-addition product: The diene reacts with HBr, and the two double bonds undergo a concerted reaction with HBr. This leads to the formation of a cyclohexane ring, with the bromine atom attached at the 1,4-position.

In the 1,2-addition product, the HBr adds directly to one of the double bonds, resulting in a monosubstituted alkyl bromide. This is known as the Markovnikov addition. On the other hand, in the 1,4-addition product, the diene undergoes a concerted reaction, where both double bonds react simultaneously with HBr.

This results in the formation of a cyclohexane ring with the bromine atom attached at the 1,4-position. The 1,4-addition product is known as the anti-Markovnikov addition. The selectivity of these additions is determined by the stability of the carbocation intermediate formed during the reaction.

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Answer: yes

Explanation: cuz i know lol

Answer: 0.188 kJ

Explanation: (0.46g C2H5Cl)(1 mol C2H5Cl/64.51g C2H5Cl)(26.4 kJ/1 mol C2H5Cl) = 0.188 kJ

I hope this helps!

The heat of vaporization is the quantity of heat which needs to be absorbed to vaporize a particular quantity of a liquid at a constant temperature. The kilojoules of heat absorbed is 0.177 kJ.

The molar heat of vaporization is defined as the energy which is required to vaporize one mole of a liquid. The units are usually kilojoules per mole, or kJ/mol. It is an important part of energy calculations which tells how much energy is needed to boil each mole of substance on hand.

Since the vaporization and condensation of a given substance are the exact opposite processes, the numerical value of the molar heat of vaporization is same as the numerical value of the molar heat of condensation.

0.46 g C₂H₅Cl × 1 mol C₂H₅Cl / 64 g C₂H₅Cl × 24.7 kJ / 1 mol = 0.177 kJ

Thus the kilojoules of heat absorbed is 0.177 kJ.

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Given, Fifteen percent of the pigment in paint colour A is black and Sixty percent of the pigment in paint colour B is black. And an unknown amount of paint colour B is mixed with 40 ml of paint colour A, resulting in a paint that contains 25% black pigment.

To find out the total amount of paint in the mixture

let total amount be = x

By following equation

0.15(40) + 0.6(x - 40) = 0.25(x).

For x = 6+0.6x - 24=0.25x

0.35x=18

By dividing both side by 0.35x

x=18/0.35

x=51.43

Therefore, the total amount of paint in the mixture

=0.15(40) + 0.6(x - 40)

= 0.25(x)

= 12.86( approx.)

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Complete question

Fifteen percent of the pigment in paint color A is black. Sixty percent of the pigment in paint color B is black. An unknown amount of paint color B is mixed with 40 ml of paint color A, resulting in a paint that contains 25% black pigment. Which equation can be used to solve for x, the total amount of paint in the mixture of the two colors?

The oxidation number of Mn in potassium permanganate is +7.

The oxidation number, also known as the oxidation state, is a measure of the degree of oxidation of an atom in a chemical compound. In potassium permanganate, the potassium ion (K+) has an oxidation state of +1, and each oxygen atom (O) has an oxidation state of -2. To determine the oxidation number of Mn, we can use the fact that the sum of the oxidation states in a neutral molecule must be zero. Therefore, we have:

(+1) + x + 4(-2) = 0

Simplifying this equation, we get:

x - 7 = 0

Solving for x, we get:

x = +7

Therefore, the oxidation number of Mn in KMnO₄ is +7. Answer: b. +7.

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If you add heat to water at 0°C, the water will decrease in volume until it reaches its maximum density at 4°C.

Water is unique in that it reaches its maximum density at a temperature of 4°C. As water is heated from 0°C to 4°C, it becomes more dense and contracts, which causes its volume to decrease. However, as the temperature of water increases beyond 4°C, it becomes less dense and expands, causing its volume to increase. This is why ice floats on water, as it is less dense than liquid water. The property of water reaching its maximum density at 4°C has important implications for aquatic ecosystems, as it allows for the circulation of water and nutrients in lakes and oceans, which is essential for the survival of many aquatic organisms.

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