Please give answer with explanation.

Johannes Kepler was a German astronomer who lived in the 17th century. He was the first scientist to accurately describe the motions of the planets around the Sun with mathematics. More than 50 years after his death, an English physicist named Isaac Newton developed a mathematical theory of gravity that applied to all objects, not just planets.

The example described above suggests that
A.
scientific knowledge is never correct because it is constantly changing as new theories are developed and discoveries are made.

B.
scientists tend to all come from the same region and live during the same time period.

C.
scientists who make contributions to scientific knowledge often come from different backgrounds and live at different times.
D.
scientific knowledge does not change through time because the earliest scientists were totally correct.

The chemical formula for an ionic compound represents the ratio of the combined ions present in a sample.

A sample of an ionic compound doesn't represent a multiple of distinct molecules, like a sample of a covalent compound, where the chemical formula does represent the number of atoms in a single, differentiated molecule. Ionic compounds form crystal lattices where each positively charged cation is surrounded by negatively charged anions and vice versa. Thus, the chemical formula of an ionic compound merely describes the ratio of cations and anions present in the crystal lattice.
The total number of ions in the lattice can, on the other hand, be calculated using the mass of the sample and Avogadro's number.

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The Fischer Esterification method is used to accomplish this preparation of isopentyl acetate.

The Fischer esterification is an alternative esterification mechanism that uses an equilibrium process. It is standard procedure to use an excess of one of the reactants, often alcohol or acid, to alter the equilibrium in a way that facilitates the synthesis of esters. Since acetic acid is less costly and more readily removed than alcohol, we will use a lot of it in the current procedure.

Another strategy to trigger a reaction to its products is to remove one of the products as it forms. In this experiment, we will completely remove the water produced in the reaction by directly adding silica beads to the reaction vessel and using a drying tube with a drying agent (calcium chloride), which forbids the entrance of moisture into the reaction.

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Whenever ionic chemicals are melted or dissolved in water, an electric current is produced. The B ions migrate toward the positive electrode in an ionic solution, while the A+ ions migrate toward the negative electrode.

Always dissociated, which means they are made up of independent cations (+) and anions, which are ionic compounds or salts (-). For instance, even in the solid state, there are just Na+ and Cl- ions in common salt, NaCl, and nothing that is "NaCl."

But the ions need to travel in order to conduct electricity. In the solid state, it is impossible to do this. Therefore, dry solid salts with no moisture at all are poor electrical conductors. The ions may travel, thus when they are in liquid form (melted) or solution (dissolved in water), they conduct electricity.

In other words, they conduct electricity because they are dissociated, not because electrical current is flowing through them.

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Radiation produced in the given reaction is beta and gamma.

Radiation is defined as a source of energy or particles that pass through the atmosphere or other media. Radiation includes microwaves and radio waves utilized for wireless communication as well as light and heat. The term "radiation" refers to energetic particles and electromagnetic waves that some materials emit.

A stream of extremely energetic electromagnetic radiation known as gamma rays or gamma radiation is released by an atomic nucleus that is going through radioactive decay.

Beta Radiation Free electrons or positrons moving at relativistic speeds make up beta radiation. The term "beta particles" refers to these entities. Beta particles are high-energy, high-speed electrons or positrons released by some fission fragments or by some primitive radioactive nuclei, such as potassium-40.

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We can see that the density of the water is less than the density of the saturated salt solution from the table shown above.

The term density is defined as the ratio of the mass to the volume of an object. In this case, we can see that we are trying to compare the density of water and the density of a salt solution. We have to recall that when we dissolve a solute in a solvent, the density of the solution would change to reflect that we no longer have a pure solvent.

This is because, the density of a substance is an intrinsic property thus it then depends on the nature of the substance and not on the amount of the substance.

Thus, we can see that when we dissolve the salt in the water, the density of the water is increased. Thus water has a density of 1 g/mL while a saturated salt solution has a density of 1.12 g/mL.

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Answer:

C

Explanation:

ostriches are classified as diurnal

Answer: The answer is diurnal!

Explanation: Nocturnal animals, such as the owl or bat, stay awake during the night and sleep during the day! Which for diurnal animals, they sleep during the night, and roam around during the day! Such as us humans are both because some people may work during the night and sleep during the day! The most common for humans is us sleeping at night though and awake during the day!

The ratio varies in different ionic compounds because different ionic compounds have different ratios of positive ions to negative ions.

An ordered grid of points known as a lattice is used to visualize how crystallizing particles are structured. The unit cell of the crystal is defined by the lattice points. The smallest part of a crystal, known as a unit cell, is repeatedly translated in three dimensions to create the whole crystal.

The crystal structure (or crystal lattice) of an ionic compound is determined by the size of the ions and the stoichiometry (ratio of cations to anions) of the ions. Many ionic compounds have variations in this ratio.

A recurring three-dimensional pattern of atoms or groups of atoms in a crystal is known as a crystal lattice structure.

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Answer:

C

Explanation:

When Beta decay happens, the atomic number of an element goes up, and that means there is an extra proton. A is not the answer because unstable atoms cause decay. B is also not correct because this is what happens in Beta decay: a neutron becomes a proton. D is not correct because an electron is actually emitted from the nucleus.

Answer:

The correct answer is B. An atom has many fewer protons than neutrons.

I just took the test.

Explanation:

Based on the freezing point depression value of HCl in benzene, HCl does not act as an electrolyte in benzene.

The freezing point of a solvent such as water is lowered by the solute which ionizes in it.

The freezing point of a solution depends on the number of particles in the solution.

The formula for freezing point depression is given below:

ΔTf = i * Kf * m

HCl remains as molecules and does not ionize in a solution of Benzene. This is because benzene is a nonpolar solvent.

Therefore, the equation for the dissolution of HCl in benzene is given below:

HCl (g) → HCl (in benzene solution)

1 mol of HCl gas gives 1 mol of HCl molecules in solution.

Therefore, HCl remains a molecule and does not act as an electrolyte in benzene.

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An ionic equation is a chemical equation in which the electrolytes in aqueous solution are described as dissociated ions.

3FeSO4(aq) + 2K3PO4(aq) = Fe3(PO4)2(s) + 3K2SO4(aq)

ionic equation : 3Fe(2+)(aq) + 3SO4(2-)(aq)+ 6Na(+)(aq) + 2PO4 (3-) (aq) → Fe3(PO4)2(s)+ 6Na(+) + 3SO4(2-)(aq)

net ionic equation: 3Fe(2+)(aq)  + 2PO4 (3-)(aq) → Fe3(PO4)2(s)  

K2CO3(aq) + CdI2(aq) = 2KI(aq) + CdCO3(s)

net ionic equation for K2CO3(aq) + CdI2(aq) = 2KI(aq) + CdCO3(s).

2HNO3 + CaCO3 = Ca(NO3)2 + H2O + CO2

ionic equation :  CaCO3(s) + 2H+(aq) → Ca2+(aq) + CO2(g) + H2O()

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Answer: Ionic Bond

Explanation: They form when the cation and the anion have opposite charges, and attract each other

The average atomic mass of your cadmium element is the mass and random errors in the measurement of mass and differences that arise from the nature of samples used for the experiment

The average atomic mass is the mass of the element that is obtained when you  consider the masses of all the isotopes that are found in the element as well as the percentage abundance of each of the isotopes and the isotope percentages in each of the samples would not be the same and this means that the results that each group would obtain would slightly differ from each other

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After allowing time for photosynthesis the ¹⁸O-radiolabeled will be found in the plants in the form of C₆H₁₂O₆.

A researcher grew a plant in an illuminated chamber with ¹⁸O-radiolabeled CO₂. After allowing the time for photosynthesis, the ¹⁸O-radiolabeled will be found in C₆H₁₂O₆ in the plant.

Photosynthesis is a process in which plants produces their food by using sunlight, carbon dioxide and water to produce their food with the help of the a green colored pigment called chlorophyll.

It does not matter which isotope of oxygen we are using for photosynthesis, the amount of the food produced will be more or less same in case of every isotope.

The oxygen isotope will get mixed in the soil of the plants and after the whole photosynthesis process is done. the oxygen is constituted in the plant as C₆H₁₂O₆ will would be further broken down into the form of o₂ and H₂O. These H₂O and O₂ will be released in the atmosphere as a final product of the complete photosynthesis.

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Organisms in over-populated areas do not survive well due to reduction in available food and shelter.

An unsustainable population within a specific area or habitat is referred to as overpopulation. A higher birth rate, a lower death rate, migration to an area of the ecosphere where there are fewer predators, or a rapid fall in the amount of resources available are all causes of overpopulation. Overpopulation thus refers to a situation when a population in a particular ecosystem depletes the resources necessary for subsistence or survival.

Overpopulation typically causes ecological disruption due to resource depletion. Other populations who compete for the same resources may experience a decline as a result of this disruption.

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All nine of the necessary amino acids that humans need are present in milk proteins.

Although the mammary gland produces the proteins in milk, 60% of the amino acids needed to make those proteins come from the cow's diet. So the milk from cows may also provide us with protein.

The dairy cow needs proteins for a variety of metabolic processes, including growth, lactation, and reproduction. The dairy cow needs proteins for a variety of metabolic processes, including growth, lactation, and reproduction. Crude protein is a popular term used to describe the protein content in feed (CP).

All elements of bodily health, reproduction, and most critically milk production in the dairy business depend on protein. The protein that the cow consumes may be divided into two types: rumen degradable protein (RDP) and rumen undegradable protein (RUP).

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The following organic molecules are isomers CH3CH₂CH₂CH3. Option A.

All organic compounds have isomers. Isomers mean that they have the same molecular formula but different configurations. The connectivity of a connection ultimately determines its functionality. For example, the same molecular formula can be used to identify alcohols or ethers.

Isomers are molecules that have the same molecular formula but differ in the arrangement of their atoms in space. This excludes all other configurations by rotating the molecule as a whole or around specific bonds. In organic chemistry, isomers are molecules that have the same molecular formula but differ in the structural or spatial arrangement of the atoms within the molecule.

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The density of a block of steel is:

8.05g/mL.

The mass of a substance per unit of volume is that the definition of density. though the sign may represent the Latin letter D, it's most often accustomed represent density. Mass divided by volume is however density is mathematically outlined.

The units of mass divided by volume accustomed live density embody grammes per cm cube (g/cm3) and kilogrammes per liter .

The equation for density is d = M/V, wherever d represents density, M is mass, and V is volume.

As a result, so as to calculate density, we tend to should divide mass by volume.

The mass is one hundred 20.75 and therefore the volume is 15.0 ml.

Divided by 120.75/15.0

8.05g/mL is the density.

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Fe(C 5H 5) 2 describes the organometallic compound ferrocene. The molecule is a complex made up of a core iron atom and two cyclopentadienyl rings.

AlCl3 is the chemical formula for aluminum chloride, sometimes referred to as aluminum trichloride.

Acetic acid is the source of the acyl chloride known as acetyl chloride.  AcCl is a frequent way to shorten its formula.

"81.3%"

One mole of ferrocene combines with one mole of acetyl chloride in accordance with the reaction's stoichiometry to produce one mole of mono acetylferrocene.

The limiting reagent is the one that is minimally present. Ferrocene is the limiting agent as a result.

The limiting reagent controls how the product is formed. So,

In a reaction, one mole of ferrocene yields one mole of mono acetylferrocene.

reaction forms with 0.0005375 moles of ferrocene Mono acetylferrocene, 0.0005375 mole

0.0005375 moles of product were produced.

Mono acetylferrocene's molar mass is 228.07 g/mole.

Produced mono acetylferrocene mass equals moles times molecular weight, or 0.0005375 x 228.07 g, or 0.123 grammes, or 123 mg.

assuming a 100 mg experimental yield

% yield is equal to (Experimental Yield / Theoretical Yield) / 100, which equals (100/ 123) / 100, or 81.3%.

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Answer: The density of a substances is generally known as mass per unit volume. And The SI unit is Kg/m3. Mass Versus Weight: Always there is confusion in people between mass and weight. Actually, the mass of an object is referred to its weight. In the scientific concepts mass refers loosely to the amount of matter in an object.

Explanation:

The density of the marble is  1.7kg/m³

Density is the amount of mass per unit of volume

Marcie fills a graduated cylinder with 15.0 mL of water (Vi) paul finds the mass of a marble to be 2.21g, then drops the marble into the graduated cylinder if the meniscus on the graduated cylinder is now at 16.3 mL (Vf)

We have to find density of the marble = ?

Volume = (Vi) -  (Vf) = 15.0 mL - 16.3 mL

Volume = 1.3mL

Mass =  2.21g

Density = mass/volume means ρ = m/V

Density = 2.21g /  1.3mL

Density = 1.7kg/m³

The density of the marble is  1.7kg/m³

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Answer:

Explanation:

The grass hopper feeds on the plants so the secondary consumer lacking its food source would decrease as the producer increases with not predator.

The pressure (in atm) of the carbon (IV) oxide, CO₂ gas collected, during the given experiment is 0.965 atm

We'll beging by obtaining the pressure (in torr) of the carbon (IV) oxide, CO₂ gas collected. This can be obtained as follow:

Pressure of CO₂ = (Pressure of lab) - (Vapour pressure of water at 21 ° C)

Pressure of CO₂ = 752 - 18.65

Pressure of CO₂ = 733.35 torr

Finally, we shall convert 733.35 torr to atm as illustrated below

We know that:

760 torr is equivalent to 1 atm

Therefore,

733.35 torr will be equivalent = (733.35 torr × 1 atm) / 760 torr

733.35 torr = 0.965 atm

Thus, from the above calculations, we can conclude that the pressure (in atm) is 0.965 atm

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Answer:

I think the right answer was "because they have already formed bonds to become more stable"

Explanation:

the reason you got the question wrong was because not all unstable elements have to be bonded with a gas molecule. It could be a metal for example.

it's hard to find these unstable elements in natural nature because since they are so unstable, they can't "wait" so they form bonds as soon as they can when they get the chance.

nature isn't controlled by scientists too, so these unstable elements form bonds with almost anything possible when they have the chance to become more stable

Answer:

Both are chemical changes and both are physical changes.

Explanation:

Milk can go sour in the fridge and I don't really know about the conserve mass one.

Identify each ingredient and output of this reaction as an acid or a basic. Right now, you're in a labeling module. switch off the quick navigation or explore mode, tab to the details, press space or enter to pick up, tab to move, and press space or enter to drop.

ch₃oh o − ↽ − − ⇀ ch₃o − h₂o answer bank.

A chemical reaction between an acid and a base is known as an acid-base response. It can be applied to calculate pH. These are known as the acid-base propositions, such as the Brnsted-Lowry acid-base statement, and they are essential generalizations of the response mechanisms and how they function when solving related problems.

Their importance is revealed when testing acid-base reactions for gaseous or liquid species, or when the acid or basic property may be less obvious. Antoine Lavoisier, a French pharmacist, gave the first of these generalizations somewhere around 1776.

It's important to suppose of the acid- base response models as propositions that round each other. For illustration, the current Lewis model has the broadest description of what an acid and base are, with the Brønsted- Lowry proposition being a subset of what acids and bases are, and the Arrhenius proposition being the most restrictive.

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Answer:

The five main postulates of the KMT are as follows: (1) the particles in a gas are in constant, random motion, (2) the combined volume of the particles is negligible, (3) the particles exert no forces on one another, (4) any collisions between the particles are completely elastic, and (5) the average kinetic energy of ...

Explanation:

The terms change of phase and change of state are synonymous. A change in phase is always accompanied by a change in heat. However, the temperature remains constant. When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, resulting in an increase in temperature.

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The largest change in freezing point will be achieved when the solvent is  tert-butanol, and Kf = 9.1.

What is freezing point?

The temperature at which a liquid turns into a solid is known as the freezing point. Similar to the melting point, the freezing point typically rises with increasing pressure. In the case of combinations and for some organic substances, such as lipids, the freezing point is lower than the melting point.

Concept of colligative property is applied here.

In this case, particularly freezing point depression.

The formula is for this is:

[tex]\delta T = K_f \times m \times i[/tex]

When we add particles of a certain solute, freezing point of a solution becomes lower than the pure solvent.

i = Van't Hoff factor (ions particles that are dissolved in the solution)

In this case, the solute is nonvolatile, so i values 1.

δT = Difference between  fusion T° of pure solvent - fusion T° of solution.

T° fusion paradichlorobenzene = 56 °C

T° fusion water = 0°

T° fusion tert-butanol = 25°

Water has the lowest fusion temperature and the paradichlorobenzene has the highest Kf. But the the tert-butanol, has the highest Kf so this solvent will have the largest change in freezing point, when all the concentrations are the same.

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The approximate percent increase in carbon dioxide concentration        =38%

For this reason, researchers regularly take air samples at several distant locations across the globe, including one atop the Hawaiian volcano Mauna Loa, to gauge the average concentration of CO2 in the atmosphere. Since the 1950s, this website has monitored the atmospheric concentration of carbon dioxide.

Percentage increase = (Increase/original  value)×100

P.I.C= (ΔC/C₁)×100 ⇒ Equation 1

Where P.I.C = Percentage increase in the concentration of carbon dioxide from 1790 to 2007,

ΔC = increase in the concentration of carbon dioxide from 1790 to 2007,

C₁ = concentration of carbon dioxide in 1790.

But,

ΔC = C₂ - C₁ ⇒Equation 2

Substituting equation 2 into equation 1.

P.I.C = [(C₂ - C₁)/C₁]×100⇒Equation 2

Given: C₁ = 278 ppm, C₂ = 383 ppm

Substituting into equation 2

P.I.C = [(383-278)/278]×100

P.I.C = (105/278)×100

P.I.C = 37.77%

P.I.C ≈ 38%

The approximate percent increase in carbon dioxide concentration =38%

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