help bro what does this even mean

Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove. Option D

The periodic table has to do with an arrangement of the elements in their order of reactivity. We know that the periodic table is arranged in groups and periods. The groups are the vertical portions while the periods are the horizontal portions.

Given that the reactivity would depend on the position of an element in the periodic table, we would look at where the elements that are to be considered are found in the periodic table.

We know that the elements that occur down the group for the metals are more reactive because they are more shielded thus they leave the attractive force of the nucleus much more easily.

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Missing parts;

Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two different metals? Barium (Ba) is less reactive than calcium (Ca) because the valence electrons in calcium atoms are farther from the nuclei and harder to remove. Strontium (Sr) is more reactive than magnesium (Mg) because the valence electrons in strontium atoms are farther from the nuclei and harder to remove. Rubidium (Rb) is more reactive than sodium (Na) because the valence electrons in sodium atoms are closer to the nuclei and easier to remove. Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.

The bonds that hold tRNA molecules in the correct three-dimensional shape are hydrogen bonds.

Hydrogen bonding is defined as a special category of attractive intermolecular forces generated from the dipole-dipole interaction between a hydrogen atom attached to a very strong electronegative atom and another strong electronegative atom.

For example, In water molecules, an H-atom is bound together by an electronegative  O-atom. Hydrogen bonding in water molecules is due to the dipole-dipole interaction between the hydrogen atom of a water molecule and the oxygen atom of another water molecule.

The strength of hydrogen bonding is much more compared to dispersion force and dipole-dipole forces.

Therefore, intermolecular hydrogen bonding between bases of the tRNA molecules is in the correct three-dimensional shape.

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If the intermolecular forces of a gas is repulsive rather than it is attractive, then the pressure of the gas is increased.

According to the Boyle's law, product PV is constant at any temperature. So, the increase in pressure of the gas decreases the volume of a gas because molecules come closed together. When the gas is compressed, gas molecules are coming in each other's way, which gives rise to a strong repulsive force. The intermolecular force in the molecule is repulsive because molecules goes away from each other, which leads to increase in the pressure. Intermolecular force is defined as the force which interfere in the interaction between molecules.

Therefore, the pressure of a gas is increased if the intermolecular forces of a gas is repulsive rather than it is attractive.

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Suppose two equal mass cars traveling with equal speeds in opposite directions collide head on and stick together then fraction of the energy is dissipated is all kinetic is dissipated

A collision which is inelastic is one in which the internal energy changes and the collision is an example of a perfectly inelastic collision and the final velocity after the collision is zero

Here given data is

The mass of one car = the mass of the second car in the collision = m

The type of collision = inelastic collision

The speed of each of the cars in the collision = v and -v

And in an inelastic collision

m × v₁i + m₂ ×v₂i  = (m₁ + m₂)×vf

Therefore we get

m × v₁i - m × vi = 0 = 2 × m × vf

Which give

vf = 0

The collision is an example of a perfectly inelastic collision and the final velocity after the collision is zero

The change in the energy is

ΔK.E = K.E final - K.E initial

K.E initial = 0.5mv² + 0.5mv² = mv²

ΔK.E = 0.5×(2×m)×0-0.5mv²+0.5mv² = -mv²

ΔK.E = -mv²

And the negative sign stand for energy given out and which give

The energy dissipated = mv² that is initial kinetic energy

Therefore all kinetic energy is dissipated

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In order for a solute to dissolve in water the solute particles must be strongly attracted to water molecules.

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Yes. The pH of 3.7 should be the equivalency point.

Methyl orange transforms from a basic to an acidic color during a strong acid weak base titration, making it a useful chemical indicator. In acidic and basic media, respectively, methyl orange exhibits red and yellow colors. In titration, the solution appears yellow at first because the pH is high.

Methyl orange is a frequently used pH indicator in titrations because of its easy-to-see color shift. Because it changes color at a weak acid's pH, it is frequently employed in acid titrations. Methyl orange turns red in an acidic medium while turning yellow in a basic one.

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The 3-bromo-2-methylpentane is the alkyl bromide and azide is the nucleophile.

The bromine leaving group initiates the reaction, which is then followed by an assault on the electrophilic carbon at the bromine leaving site by the nucleophile azide.

In this reaction, azide and alkyl bromide mix to form the desired product using the SN2 mechanism. Through a coordinated process, the bromine atom is simultaneously removed and sodium azide, acting as a nucleophile, attacks the carbon-containing bromine group to produce the SN2 product.

As a result, we can infer that azide is the nucleophile and 3-bromo-2-methylpentane is the alkyl bromide.

A chemical species known as a nucleophile donates an electron pair in response to another chemical species in order to create a chemical bond. An electrophile can be any molecule, ion, or atom that is in some way electron-deficient. A nucleophile typically has one electron pair and is negatively charged or neutral.

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The precipitate of reaction that occurs when silver nitrate solution is mixed with sodium chloride solution is of silver chloride (AgCI).

The chemical equation for this precipitation reaction is as following:

AgNO3(aq) + NaCl(aq) --> AgCl(s) [precipitate]+NaNO3(aq)

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Because London, less The forces of dispersion between C2H5OH molecules are stronger than between CH3OH molecules.

a material's smallest unit that possesses both of its physical and chemical characteristics. Within molecules, more atom division takes place. For instance, the atom and molecule of oxygen are represented by the letters O and Molecular oxygen, respectively.

The majority of molecules in the human body are "organic" molecules, which have a skeleton formed of carbon atoms connected to other elements, and water, a molecule with two protons and one oxygen atoms. Large biological molecules can be divided into four main categories: lipids, proteins, nucleic acids, and carbohydrates.

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Enthalpy of the reaction is 238.88 kJ/ mol.

What is the enthalpy of the reaction?

The change in enthalpy that takes place during a chemical reaction at constant pressure is known as the Heat of Reaction (also known as the Enthalpy of Reaction). It is a helpful thermodynamic unit of measurement for determining how much energy per mole is emitted or created during a reaction.

Given mass of sodium = 0.538 g

The reaction is,

Na(s)+HCl(aq)→NaCl(aq)+12H2+Δ(heat)

number of moles of sodium = given mass / molar mass

number of moles of sodium = 0.538 g / 22.99 g/mol

number of moles of sodium = 0.0234 mol

enthalpy of the reaction ΔH∘rxn = 5590J/ 0.0234 mol

enthalpy of the reaction ΔH∘rxn  = 238.88 kJ/ mol

Hence, enthalpy of the reaction is 238.88 kJ/ mol

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There are three unknown samples (A, B, C)

A is liquid

B is Gaseous

C is solid

There are 3 states of depend: solid; liquid and gas . They have special properties, which may be defined with the aid of using searching on the association in their particles.

A stable has a described form and volume. A not unusual place instance is ice. A liquid has a described volume, however can extrude nation. An instance is liquid water. A gas has neither a described form nor volume.

In physics, a nation of depend is one of the wonderful bureaucracy wherein depend can exist. Four states of depend are observable in regular life: solid, liquid, gas, and plasma

Here the conclusion are we know that in solid the particles are closely packed, in liquid they are farther and in gas state they are very farther and can move freely. when temperature changes the state of matter also changes.

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The ions present in solution are:[tex](NH_{4})_{2} SO_{4} --------- > NH_{4}^{+} + SO_{4}^{2-}[/tex]

When these compounds are dissolved in water, they will separate into (ions) cations and anions.

Compound                                            Cation                                Anion

(NH₄)₂SO₄ (Ammonium sulfate)         NH₄⁺ (Ammonium)      SO₄²⁻(Sulphate)

This compounds is made up of one cation and one anion but by convention while writing a chemical formula is that a cation is written first followed by an anion.

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The elements Na, Li, K, Rb, and Cs in order of increasing ionization energy is Li, Na, K, Rb, Cs. The correct answer is option D.

What is ionization energy?

The ionization energy is the minimum energy which is required to remove a valence electron from an isolated gaseous atom, molecule or a positive ion. This measures the ability of an atom to form an ion by losing an electron to take part in a chemical reaction.

As we move down the group, the ionization energy decreases due to the increase in the atomic size of an element. So, the electrons are far from the nucleus and loosely bound to the nucleus.

Therefore, it is easy to remove an electron from the elements which are found lower in the group. So, the order of increasing ionization energy is Li, Na, K, Rb, Cs, the correct answer is option D.

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When an element has a cation of +2, it has lost two electrons. A solution is a choice (E).

In electrolysis, the cathode would be drawn to a positively charged ion called a cation. In order for a cation to develop, one or more electrons must be lost, usually by the action of atoms with a larger affinity for them.

Following the chemical symbol is a number indicating the number of electrons lost and consequently the charge of the ion. For example, silver (Ag) loses one electron to become Ag+ while zinc (Zn) loses two electrons to become Zn2+.

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The procedures which would best measure a physical property of unknown sample include the following:

1. Place the sample in a resealable, zip-top bag.

2. Firmly close the zip-top bag.

3. Lightly tap the sample with a hammer.

4. Observe if the sample dents, breaks, or shatters.

5. Record your observations.

In Science, a physical property can be defined as the properties of an object that can be measured and observed without changing or altering the chemical composition of the object.  

In Chemistry, there are two (2) main types of physical property and these include the following:

In conclusion, the aforementioned physical properties such as placing the unknown sample in a zip-top bag that is resealable and firmly close the zip-top bag.

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Complete Question:

A student wants to conduct an investigation that will determine a physical property of an unknown substance. Which of these procedures would best measure a physical property of the unknown sample?

answer choices

1. Create an acidic solution by adding 5 mL vinegar to 100 mL water

2. Place the sample into the acidic solution

3. Observe if the sample begins to fizz in the solution

4. Record your observations

1. Place the sample in a resealable, zip-top bag

2. Firmly close the zip-top bag

3. Lightly tap the sample with a hammer

4. Observe if the sample dents, breaks, or shatters

5. Record your observations

1. Using tongs, hold the sample over a flame

2. Observe if the sample catches on fire

3. Record your observations

1. Break the sample into a fine powder

2. Add the powder to a 500 mL beaker

3. Add 300 mL of water to the beaker and use to stirring rod to mix

4. Using a dropper, add 4 drops of universal pH indicator to the solution

5.Observe any color change in the sample6. Record your observations

Answer:

b) electrons are shared in a covalent bond

Explanation:

remember for ionic bonding, it occurs between a metal and a non-metal, we know that the metal donates electrons to the non-metal while the non-metal is the receiver.

the reason why the metal donates electron is usually because it has between 1-3 electrons on its valence shell and therefore there is a weaker attraction of the positive nucleus to the outermost electrons hence why it is readily donated.

the opposite occurs for the non-metals hence why it readily accepts electrons to become stable

Based on the conversion rate, the half-life of cyclopropane is 23.1 min.

Remaining cyclopropane amount = 100 - 19.6

Remaining cyclopropane amount = 80.4%

Using the formula -

ln remaining amount = - kt, where k is constant and t is time.

Keep the values -

ln (0.804) = -k7.57

Keep the value of ln 0.804

k = -0.22 ÷ -7.57

Cancelled negative sign and performing division

k = 0.03/min

t = 0.693 ÷ k

t = 0.693 ÷ 0.03

Performing division to find the half-life

time = 23.1 min

So, the half-life of cyclopropane is 23.1 min.

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The mass of ammonium chloride must be added to a 0.500 l solution of 0.250 m ammonia to make a buffer with a pH of 9.26 is 10.16 g.

given that :

pH = 9.26

molarity = 0.250

volume = 0.500 L

the formula for the pH is given as :

pH = pKa + log ( base / acid )

pKa for ammonia = 9.25

putting all the value in the equation we get:

9.26 = 9.25 + log ( 0.250 × 0.5 ) / NH₄Cl

moles of NH₄Cl = 0.19 mol

mass of NH₄Cl = molar mass × number of moles

mass of NH₄Cl = 53.49 × 0.19

mass of NH₄Cl = 10.16 g

Thus, The mass of ammonium chloride must be added to a 0.500 l solution of 0.250 m ammonia to make a buffer with a pH of 9.26 is 10.16 g.

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The force that mediates a molecule's interaction with another molecule, including electromagnetic forces of attraction or repulsion, is known as an intermolecular force (IMF) or secondary force.

Intermolecular forces, such hydrogen bonds and dipole-dipole interactions in chromatography, are another factor that aids in keeping the analyte attached to your column's stationary phase. The compound is kept in the column longer and with greater strength as a result of stronger intermolecular forces.

We cannot separate a combination of components into their distinct components if the chromatography solvent is highly polar in nature. - The mixture of components cannot be separated into their individual components if the chromatography solvent is non-polar.

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The experiment that led to the determination that electrons act as both particles and waves is Feynman's Double Slit Experiment.

Feynman anticipated that electrons would behave like particles when just one slit was open. When both slits were open, however, the electrons generated a distinctive pattern of light and black fringes on the detector due to wave interference.

Based on the American Physical Society, the earliest iteration of the double-slit experiment was performed in 1801 by the British polymath Thomas Young (APS). His work proved the interference of light waves and established that light was a wave rather than a particle.

The double-slit experiment is proof in contemporary physics that light and matter may exhibit properties of both conventionally defined waves and particles; moreover, it demonstrates the essentially probabilistic nature of quantum mechanical events.

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The numbers of protons, electrons, and neutrons in four atoms. Atom 1 has charge of -1.

Atom                            1    2   3   4

Number of protons   9     9    9    19

Number of neutrons 8     19  19    10

Number of electrons 9     8   19    19

An atom is a particle of remember that uniquely defines a chemical element. An atom consists of a important nucleus this is surrounded by using one or extra negatively charged electrons. The nucleus is definitely charged and carries one or extra exceedingly heavy particles known as protons and neutrons.

An atom is any particle of count number at its most simple level which contains at the least one proton. here are a few examples of the atoms: hydrogen (H) and neon (Ne). However in terms of the phrase atom, we ought to go to historic Greece of four hundred B.C. And there has been a first rate truth seeker named Democritus, and he proposed the Greek word atomos, which means that uncuttable. And so as he defined, all count become ultimately reducible to discrete, small debris or atomos.

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The best describes the type of cellular transport that the student is investigating would be passive transport of osmosis.

Passive transport is transport that does not require energy. This transport occurs due to differences in concentration between substances or solutions that move from high concentrations to low concentrations. There are three types of passive transport namely diffusion, assisted diffusion and osmosis.

Basically, osmosis includes diffusion events. However, in osmosis, what moves through a semipermeable membrane is water from a hypotonic solution (high water concentration, low solute concentration) to a hypertonic solution (low water concentration, high solute concentration). For example, potatoes that are soaked in concentrated sugar water for several hours will experience weight loss. This is because the water in the potato cells moves into the sugar solution.

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In this particular problem, Molality is 10.74 m.

What is the difference between molality and molarity?

Despite the fact that both terms are used to describe the concentration of solutions, molality and molarity are not synonymous. The amount of solute dissolved in a litre of solution is known as its molarity. Molarity is denoted by the capital "M," and its formula is M=(# mol SOLUTE)/. (Liters of SOLUTION).

The amount of moles of solute per kilogramme of the SOLVENT, NOT the solution, is called molality. Molality is denoted by the lower case letter "m," and its formula is m=(# mole SOLUTE) /. (Kilograms of SOLVENT).

Most of the time scientists use either molarity or molality to represent solution concentration, but MOLALITY is preferred when the temperature of the solution varies. That is because MOLALITY does not depend on temperature, (Neither number of moles of solute nor mass of solvent will be affected by changes of temperature.) while MOLARITY changes as temperature changes.

In this particular problem, Molality = 10.74 m Molarity = 6.76 M mole fraction = 0.162 40%

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Option D. One strand is new and the other is from the original molecule, about the strands of a newly replicated DNA molecule is correct

Deoxyribonucleic acid is a polymer composed of two polynucleotide chains that coil around every different to form a double helix wearing genetic commands for the development, functioning, growth, and reproduction of all recognized organisms and plenty of viruses. DNA and ribonucleic acid are nucleic acids.

DNA replication is the organic manner of manufacturing two equal replicas of DNA from one unique DNA molecule. DNA replication happens in all dwelling organisms appearing because the most important part of biological inheritance

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Disclaimer:- your question is incomplete, please see below for the complete question.

Which of the statements about the strands of a newly replicated dna molecule is correct?.

A. Both strands contain some nucleotides from the original molecule.

B. The sugar-phosphate chains are conserved and new bases are inserted between them.

C. The base pairs are conserved and new sugar-phosphate backbones are built upon them.

D. One strand is new and the other is from the original molecule.

E. Both strands are made up of newly assembled nucleotides.

No, the number of total molecules on the left side of a balanced equation is not equal to the number of total molecules on the right side of the equation. A molecule is the smallest number of atoms bonded together for a chemical reaction. The total number of atoms must be the same, but not molecules.

The reactants and products of a chemical reaction are denoted by their corresponding chemical formulae in a chemical equation, which represents the reaction symbolically.

Example: Water is created when hydrogen and oxygen combine to make [tex]2H_{2} + O_{2} --- > 2H_{2}O[/tex]

To satisfy the law of conservation of mass, which states that the "Total mass of the products is equal to the Total mass of all the reactants," is the most crucial aspect in balancing chemical equations.

The law of conservation of mass will be broken by an unbalanced chemical equation. If it does, it will suggest that mass is either created or destroyed, which is not feasible.

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The upper left corner is 87 Rb (option-b).

To determine the age of old rocks, scientists use the radioactive isotope rubidium-87. Its 49 billion-year half-life is very long. In high-accuracy timing devices like GPS receivers, it serves as a frequency standard as well. Bose-Einstein condensates and laser cooling are two additional uses for it.

The strontium (87Sr/86Sr) isotope ratio is a significant and potent investigative tool that has been used extensively and successfully in petrogenesis (e.g., Nakai et al., 1993; Subas et al., 2015; Kozlik et al., 2016), mineral weathering, and acidity in soils (e.g., Graustein and Armstrong, 1983; Bullen et al., 2016).

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Answer:

your answer is correct tho

Explanation:

The thing here is to base the number of significant figures in the given.DO NOT USE THE CONVERSION FACTOR TO FIND THE NUMBER OF SIGNIFICANT FIGURES USED TO FIND THE ANSWER.

please rate it,Thanks.

The concentration, in m/v %, of a solution prepared by dissolving 65.4 g NaCl in a total volume of 3.7 l of solution is 1.76 %.

The data given as follows:

mass of the NaCl = 65.4 g

volume of the solution = 3.7 L = 3700

concentration in m/v % is means that : mass by volume percentage and is given as :

concentration in m/v % =(mass of solute / volume of the solution ) × 100 %

                                      = ( 65.4 / 3700 ) × 100 %

                                      = 1.76 %

Thus, The concentration, in m/v %, of a solution prepared by dissolving 65.4 g NaCl in a total volume of 3.7 l of solution is 1.76 %.

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Lichens or moss similar to the pioneer species, like grass, that colonize an abandoned field is lichens and moss can exist where there is no soil, while pioneer species, such as grass, need soil to grow

A moss is a simple plant and the lichen is the fungi and algae sandwich and mosses are multicellular organism with leaflets of photosynthetic cell and just as with trees, ferns and wildflowers and lichen are usually considered pioneer species because they are able to grow on bare surfaces like rock and a lichen is a producer that is actually composed of two different species a fungus and a algae and the alga photosynthesizes while the fungus absorbs nutrients from rock and hold water

And through their ability to adapt to living in extreme conditions and lichen can colonize substrates that are low in nutrients and are considered as true pioneer

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