sodium atom cannot exist freely In nature but argon atom can.give reason
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Answer:

I would say it would float do to the density a weight is not heavy enough to sink

Explanation: ✪ ω ✪ Hope Dis Helped!

Answer:

25.91 L

Explanation:

P1V1= P2V2

748 (26.5) =  765 ( V2)      V2 = 25.91 LITERS  

Answer:

In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. The resulting radiation showed high penetration through a lead shield, which could not be explained via the particles known at that time.

Explanation:

The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10-³⁴J)

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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The correct answer is the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.

The given solution is a hypotonic solution as the solution's tonicity is lower than that of the tears. The tears contain 0.9% w/v of NaCl, which is isotonic with tears. So, to make the given solution isotonic, the amount of sodium chloride needs to be added.

The concentration of NaCl in tears is 0.9% w/v. Additional Information: We know that % w/v is the amount of solute present in grams per 100 ml of the solution. Therefore, 0.9% w/v means 0.9 grams of NaCl is present in 100 mL of tears.

To make 30 ml of isotonic solution, we can use the following formula: Equivalent weight of NaCl = 58.5/2 = 29.25 (as NaCl ionizes to give Na+ and Cl- ions)Moles of NaCl required to make 30 ml isotonic solution = 0.9 × 30 / 1000 = 0.027Moles of Na+ and Cl- ions present in 30 mL of isotonic solution = 2 × 0.027 = 0.054

A number of grams of NaCl needed to prepare 30 mL of isotonic solution is calculated as follows:0.054 g = (0.027 x 29.25 x X) / 1000Where X is the amount of NaCl required to make 30 mL isotonic solution. Solving this equation gives us: X = 1.85 g (approx). Therefore, the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.

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Answer:

fossil fuels are an  nonrenewable resource that people are hoping to replace with renewable resources

Explanation:

The amount of the magnesium in the sample in ppm is 497 ppm.

The term parts per million refers to one of the manners in which concentration is expressed. It is common in oceanography and analytical chemistry.

Given that;

Mass of Mg= 0.0549 g

Mass of the sample = 110.52 g

Amount in PPM = 0.0549 g/110.52 g * 10^6

= 497 ppm

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Answer:

a change in an atom's nunclues usually producing a different elements.

on the other hand, involved only a rearrangedment of electrons and do not involve change in the nuclie

Explanation:

Hope it helps kindly follow me

Answer: Click the puzzle pdf I did some of the words but if you need more let me know because I will go back in and do more!

Explanation:

The kinetic molecular theory is a classical model that explained the movement of gas particles. It started about constant motion and collision, and the relation of KE with temperature.

The Kinetic molecular theory was given by several scientists including Rudolf Clausius, Boltzman, Avogadro, and Graham. It stated several principles based on observations and experiments.

It stated that matter is composed of particles that are constantly in motion and have been known to show the constant perfect elastic collision due to the addition or removal of energy.

The kinetic energy of the particles is directly proportional to the temperature of the ideal gas condition and is involved in changes in the state of matter. Higher temperature exhibits more collisions.

Therefore, the Kinetic molecular theory stated about the particles, motion, collision, temperature, etc.

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The Ca2+ concentration in a groundwater that is in equilibrium with calcite and has a PCO2 of 10-2.5 (atm) is 1.6 × 10-3 M.

The equilibrium expression for the dissolution of calcite (CaCO3) in water, assuming that CO2 is the only acidic gas present, is : CaCO3(s) + H2O + CO2(g) ↔ Ca2+(aq) + 2HCO3-(aq)

The equation for the relationship between the PCO2 of a gas and the concentration of dissolved CO2 in a solution in equilibrium with the gas is as follows : PCO2 = K(H2CO3) × [H2CO3] where,

K(H2CO3) is the Henry's law constant for CO2

H2CO3 is the concentration of dissolved CO2 in equilibrium with the gas.

We can estimate the concentration of H2CO3 as follows :

H2CO3 = α(CO2) × PCO2 where α(CO2) is the solubility coefficient of CO2 in water, which is a function of temperature, pressure, and salinity.

To solve the problem, we need to know the values of the following constants :

K(H2CO3) at 25 °C is 1.20 × 10-3 atm/(mol/L).

α(CO2) at 25 °C is 3.37 × 10-2 mol/L/atm.

Substitute the values into the equation :

PCO2 = K(H2CO3) × [H2CO3]10-2.5 atm = (1.20 × 10-3 atm/(mol/L)) × [H2CO3]

H2CO3 = (10-2.5 atm) / (1.20 × 10-3 atm/(mol/L)) = 8.33 × 10-3 M

Substitute the value of H2CO3 into the equilibrium expression and solve for the concentration of Ca2+ :

Ksp = [Ca2+][HCO3-]2 = 4.86 × 10-9

Ksp = [Ca2+][HCO3-]2[Ca2+] = Ksp / [HCO3-]2[Ca2+] = (4.86 × 10-9) / (8.33 × 10-3)2 = 1.6 × 10-3 M

Therefore, the Ca2+ concentration in a groundwater that is in equilibrium with calcite and has a PCO2 of 10-2.5 (atm) is 1.6 × 10-3 M.

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The mass of 2.75 moles of CO2 is approximately 121.03 grams.

To calculate the mass of 2.75 moles of CO2, we need to use the molar mass of CO2.

The molar mass of CO2 is approximately 44.01 g/mol (12.01 g/mol for carbon + 2x 16.00 g/mol for oxygen).

To calculate the mass of 2.75 moles of CO2, we can use the following formula:

mass = moles x molar mass

Substituting the given values, we get:

mass = 2.75 moles x 44.01 g/mol

mass = 121.0275 g

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Increasing the temperature of the system will cause the reaction to shift to the left (in the direction of the reactants). Therefore, the correct answer is A.

This reaction,

  C₃H₈(g) + 5 O₂(g) ↔ 3 CO₂(g) + 4 H₂O(l) ΔH° = -2220 kJ

is exothermic, as indicated by the negative ΔH° value. This means that heat is released as the reaction proceeds in the forward direction, from reactants to products.

According to Le Chatelier's principle, if we increase the temperature of the system, the reaction will shift in the direction that absorbs heat in order to counteract the change. In this case, that means the reaction will shift to the left, in the direction of reactants. This will decrease the amount of products and increase the amount of reactants until a new equilibrium is reached.

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Answer:

Ionization energy is simple terms can be described as a measure of the difficulty in removing an electron from an atom or ion or the tendency of an atom or ion to surrender an electron.

Answer:

What is meant by ionization energy​?

Ionization energy or ionization potential is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule. The amount of energy required to remove an electron from an isolated atom or molecule.

Example of ionization energy​

1) Ionization energies measure the tendency of a neutral atom to resist the loss of electrons. It takes a considerable amount of energy, for example, to remove an electron from a neutral fluorine atom to form a positively charged ion.

2) Ionization: Changing Atoms Into Charged Ions

Some examples that you may be familiar with include: When sodium and chlorine combine to make salt, the sodium atom gives up an electron resulting in a positive charge while chlorine gets the electron and becomes negatively charged as a result.

The electrostatic forces of attraction acting between the following substances are as follows:​

​​a.​the crystal lattice of an ionic compound - between cations and anions

​​b.​the crystal lattice of a metal - between positive nuclei and delocalized electrons

​​c. ​two atoms in a covalent bond - between the dipoles

d. ​a hydrogen bond - between hydrogen atoms and electronegative. atoms

Electrostatic forces are forces of attraction or repulsion that exist between two charged particles.

When the charged particles possess similar charges, the electrostatic forces that exist between the particles are forces of repulsion.

When the charged particles possess similar charges, the electrostatic forces that exist between the particles are forces of attraction.

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Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore the correct option is option D.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

In CaCl\(_2\)(aq), CaCl\(_2\) molecules, H\(_2\)O molecules, Ca²⁺ ions and Cl⁻ ions will be present.

Therefore the correct option is option D.

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Answer:

Cathode rays.

Explanation:

J.J Thomson - Cathode ray experiment shot cathode rays (negative electrons) through a tube and played around with magnets, ray bent towards the positive so that meant rays were negative, J.J Thomson discovered the Electron.

When the solvent is poured into the funnel at a rate of 60 milliliters per second and the solvent flows out of the funnel at a rate of 40 milliliters per second, it will take 10.05 seconds before the funnel overflows.

The volume of a cone defines the space or the capacity of the cone. A cone is a three-dimensional geometric shape having a circular base that tapers from a flat base to a point called apex or vertex.

V = 1/3(πr²h)

where r is the radius and h is the height of the cone.

Given a funnel is getting filled with the solvent at a rate of 80ml per sec and the solvent is coming out of the funnel at a rate of 65ml per sec.

rate at which the funnel is getting filled is 60-40= 20 ml per sec.

So, this means that the funnel is getting filled at a rate of 20 ml per sec.

For the funnel to overflow it need to be filled completely.

The time before the funnel gets overflowed is = volume of funnel/ rate

A funnel is in the shape of an inverted cone.

The volume of the funnel V = 1/3(πr²h)

V = 1/3 (3.14 ×4² ×12)

V = 1/3 (602.88)

V = 200.96 cm³

Time before the funnel gets overflowed is 200.96/20

= 10.05  Sec

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When Cobalt-63 undergoes beta decay, a neutron decays into a proton, and an electron and an antineutrino are released. This creates a daughter nuclide with the same mass number as the parent nuclide but with a one higher atomic number.

The daughter nuclide formed from beta decay of Co-63 is Nickel-63.When a Cobalt-63 nucleus undergoes beta decay, it releases a high-energy electron (beta particle) and an antineutrino, and one of its neutrons turns into a proton. As a result, a new nucleus, nickel-63, is formed. The beta decay of Cobalt-63 can be written as follows:Co-63 ⟶ Ni-63 + e- + ν¯eThe number of protons in the nucleus increases by one during beta decay because a neutron changes to a proton. In contrast, the mass number remains the same because the mass of an electron is negligible compared to that of a proton. As a result, the daughter nuclide formed from beta decay of Co-63 is Nickel-63.

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Marathon runners well exhibit the differences between the behavior of molecules in different states of matter.

At the starting point before the start of the race, the runners would gather in a common place before the starting line. They would be close to each other and are tightly packed like solid molecules.

After the race was started, some players would start to move fast and some remain in a group for a certain period. They were loosely packed compared to solid.

As the game reaches the end point, the players would be more spread out based on their stamina. They would be more loosely packed compared to solid and liquid.

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The element only made in the laboratory is fermium. So the correct option is (C).

The synthetic element ferromium has an atomic number of 100 and the letter Fm. Although pure fermium metal has not yet been created, it is an actinide and the heaviest element that can be created by neutron bombardment of lighter elements.

As a result, it is the last element that can be synthesized in macroscopic amounts. Fermium is a synthetic element; it is not a naturally occurring element. Small amounts of it are created in nuclear reactors when plutonium is bombarded with neutrons through a number of different neutron capture processes.

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Answer:

Each 24 hours for every 5 pounds of turkey. So a 15-pound bird will take around 3 days to thaw completely.

Explanation:

The complete statement is  a Bronsted-Lowry acid is a proton donor and must therefore contain at least one ionizable hydrogen atom in its formula.

According to Bronsted-Lowry theory, an acid is a substance that donates a proton (H+ ion) and a base is a substance that accepts a proton (H+ ion). In other words, an acid is a proton donor and a base is a proton acceptor.

Bronsted-Lowry acid must contain at least one ionizable hydrogen atom in its formula so that it can donate a proton to another species or substance during a chemical reaction.

This means that an acid is defined by its ability to donate a proton (H+ ion) to another substance in a chemical reaction, and this is possible only if it contains at least one ionizable hydrogen atom in its formula.

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Formaldehyde is a substance made up of Carbon, Nitrogen, and Oxygen different types of atoms that are chemically combined in a fixed ratio of 1: 2:1. It is classified as an aldehyde.

This refers to a naturally occurring organic compound with the formula CH2O and structure H−CHO. It is also called methanal. The pure compound is a pungent, colorless gas such that it polymerizes spontaneously into paraformaldehyde. It can be stored as an aqueous solution that is formalin. This is also used to store animal specimens.

Formaldehyde is an organic compound. It contains a carbon atom present in its chemical formula. It is also classified as an aldehyde. Formaldehyde(RC=OH) contains a formyl group  and an R group, which is a group that contains carbon and/or hydrogen.

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The best local resource when first addressing the issue of an unknown chemical is a certified chemical laboratory or a local poison control center.

When confronted with an unknown chemical substance, it is crucial to prioritize safety and obtain accurate information regarding the potential hazards and appropriate handling procedures. A certified chemical laboratory can offer expertise in chemical analysis and identification. They possess the necessary equipment and trained personnel to handle and analyze unknown substances. They can perform tests, such as spectroscopy, chromatography, or elemental analysis, to determine the composition and properties of the chemical.

Alternatively, contacting a local poison control center can provide immediate assistance in dealing with potential toxic exposures. Poison control centers are staffed by professionals who can provide expert advice on identifying and handling unknown substances. They can assess the situation, provide guidance on proper precautions, and advise on the appropriate steps to take, including potential decontamination procedures.

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Grizzly bears are omnivores, meaning that they consume both plant and animal matter. This study, which analyzed nitrogen content in bear fur samples, indicates that bears that consume more animal matter have a higher nitrogen content in their diet and are therefore more active.

Nitrogen is an essential nutrient for building proteins and is found in higher amounts in animal matter compared to plant matter. Therefore, bears that consume more animal matter may have more energy and be more active.
Hi! Based on your question, it seems that you want to know which type of food, when consumed by grizzly bears, leads to higher activity levels, as indicated by nitrogen content in their fur samples. Grizzly bears are omnivores, meaning they eat both plants and animals. Nitrogen content in their fur samples can be used as an indicator of the bear's diet. Typically, higher nitrogen content is associated with a diet richer in animal protein. Therefore, we can conclude that grizzly bears consuming more animal protein are more active.

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Grizzly bears are omnivores. this data (taken from bear fur samples to determine nitrogen content in their diet)x indicates that bears that consume ___ are more active

Grizzly bears are omnivores, which means that they consume both plants and animals. The data taken from bear fur samples to determine nitrogen content in their diet indicates that bears that consume more animal protein are more active. Animal protein provides bears with the necessary energy and nutrients to support their active lifestyles, including hunting, scavenging, and defending their territories.

However, it is important to note that the amount of animal protein consumed by grizzly bears varies depending on factors such as season, location, and availability of food sources.

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Explanation:

The polarity of a bond is given by the difference in electronegativity between the two atoms that form said bond.