If a sample of a radioactive isotope has a half-life of 1 year,
how much of the original sample will be left at the end of
the second year? What happens to the rest of the sample?​

By equalising LHS with RHS,balanced chemical equation is:[2] Na + [2] H2O  = [2] NaOH + [1] H2

Balancing is necessary for all chemical equation.The purpose to balance chemical equations are to make both sides of the reaction,reactants and products, equal in the no. of atoms per element.

If Sodium is multiplied by two, the no. of Sodium atoms are in balance.By the process of balancing we can also keep a check on the rightness of the equation.

Sodium hydroxide and Hydrogen gas is product of this reaction.NAOH dissolves in water and contains hydroxide anions(OH-) and sodium cations(Na+).

The balanced equation is 2Na + 2H2O = NaOH + H2

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At constant temperature, the final pressure of the compressed gas is 5.0atm.

Given the data in the question;

Final pressure; \(P_2 = \ ?\)

Boyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P at constant temperature.

It is expressed as;

\(P_1V_1 = P_2V_2\)

Where \(P_1\) is Initial Pressure, \(V_1\) Initial volume, \(P_2\) is Final Pressure and \(V_2\) is Final volume.

To determine the final pressure of the gas, we substitute our given values into the expression above.

\(P_1V_1 = P_2V_2\\\\P_2 = \frac{P_1V_1}{V_2} \\\\P_2 = \frac{1.0atm \ *\ 4L}{0.800L}\\ \\P_2 = \frac{1.0atm \ *\ 4}{0.800}\\\\P_2 = \frac{4.0atm}{0.800}\\\\P_2 = 5.0atm\)

Therefore, at constant temperature, the final pressure of the compressed gas is 5.0atm

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The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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The arrow in a chemical reaction can be translated as the following:

A. yields

C. react to form

The statement "The orbit of a comet is one of nature's cycles" is True because The orbit of a comet is a natural cycle that follows the laws of physics and determines its path around the Sun.

Comets have highly elliptical orbits that can take them far away from the Sun and then back again, following a predictable cycle that can span many years or even centuries. This cycle of orbit is a natural phenomenon that occurs due to the gravitational forces of the Sun and other celestial bodies.

Comets are celestial bodies that follow an elliptical orbit around the Sun. Their orbit is determined by the gravitational forces acting on them from the Sun and other celestial bodies, such as planets and moons. The path of a comet is predictable and follows the laws of physics, which govern the motion of all celestial bodies.

As the comet approaches the Sun, it heats up and releases gas and dust, creating a glowing tail that can be seen from Earth. This tail always points away from the Sun, due to the solar wind blowing the gas and dust particles away from the comet.

The orbit of a comet is a natural cycle that repeats itself over time. Depending on the shape and size of the comet's orbit, its cycle can span many years or even centuries. For example, Halley's Comet, one of the most famous comets, has an orbit that takes it around the Sun every 76 years. This means that it follows a predictable cycle, and astronomers can calculate when it will be visible from Earth again.

In summary, the orbit of a comet is a natural cycle that is determined by the laws of physics and the gravitational forces of celestial bodies. This cycle determines the path of the comet around the Sun and can span many years or even centuries.

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Answer:

The answer is D if it's wrong let me know pls

Answer: 3

Explanation:

3) both electrolytic cells and voltaic cells

The statement, that describes reduction occurs at the cathode is "both electrolytic cells and voltaic cells."

The gain of electrons is referred to as reduction. The species that is being oxidised is also known as the reducing agent or reductant, whereas the species that is being reduced is known as the oxidising agent or oxidant.

Reduction takes place at the cathode electrode whereas oxidation occurs at the anode in both galvanic and electrolytic cells, and electrons travel from the anode to the cathode.

Electrons must move toward the location of reduction since reduction is the addition of electrons. The negative charge is on the cathode of an electrolytic cell, while the positive charge is on the anode.

Hence, the correct answer is 3.

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From the information provided in the question, the mass of NiCl2 required is 0.23 g.

NiCl2(aq) + 2AgNO3(aq) -------> 2AgCl(s) + Ni(NO3)2(aq)

Number of moles of AgCl= Mass/molar mass

Molar mass of AgCl= 143 g/mol

Substituting values;

Number of moles = 503 × 10^-3g/143 g/mol= 0.00352 moles

Since 1 mole NiCl2 precipitates 2 moles of AgCl

x moles of NiCl2 precipitates  0.00352 moles of AgCl

x = 1 mole ×  0.00352 moles/2 moles

x = 0.00176 moles of NiCl2

Mass of NiCl2= 0.00176 moles × 130 g/mol = 0.23 g

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J.J. Thomson discovered electrons and their negative charge through the cathode ray experiment, leading to the development of the plum pudding model of the atom.

J.J. Thomson, a British physicist, was the first to discover electrons in 1897.

He conducted the cathode ray experiment to identify the negatively charged particles.

The cathode ray tube is a vacuum-sealed glass tube with two electrodes at each end: a cathode and an anode.

When a high voltage electrical current is applied to the electrodes, the tube glows, indicating that the cathode rays are being emitted from the cathode and traveling through the tube towards the anode.

The cathode rays were found to have a negative charge, according to Thomson.

These rays were identified as particles by the presence of a magnet, which caused the particles to bend in the direction opposite to the magnet's polarity.

This discovery indicated that the particles had a charge on them because they were deflected by the magnetic field, which is only possible if the particles have an electric charge.

Thomson further concluded that these particles were about 1,000 times smaller than hydrogen atoms because of the degree of deflection they experienced in the magnetic field.

Furthermore, Thomson created the plum pudding model of an atom, in which electrons are dispersed throughout a positively charged matrix, based on his findings.

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There are 2 interphases: anode solid electrolyte interphase and cathode electrolyte interphase.

In battery systems an interphase forms at the interface between electrode and electrolyte at the decomposition of the latter. In fig. cathode and anode surface of the atom has been shown. The ions are transported in bulk electrolyte and then pass through desolvation pass to pass this cathode electrolyte interphase. This interphase must have high permeability, and sensitivity, an electronic insulator, should be insoluble and inert so that it doesn't create any issue in the system and will not affect the chemical and electrochemical environment of the cell. Thereby after the desolvation process, it can easily pass the interphase.

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The effect of table salt and sugar on bubbles is that sugar makes it easier to blow and stronger whereas salt makes it difficult to blow bubbles.

(i) The combination in cup 2 made blowing bubbles simpler since the bubbles lasted longer; nevertheless, when the bubbles struck something, they popped just as easily as the ones in cup 1.

(ii) However, compared to cup 1, the combination in cup 3 made blowing bubbles more challenging.

(iii) Compared to salt, which did not mix well together with liquid dish detergent and made it more difficult to blow huge, forceful bubbles, sugar was an excellent ingredient to mix with liquid dish detergent.

(iv) If we were to carry out this experiment further, we may experiment with other materials in the cups to discover which ones the liquid dish detergent reacted best with. Using cups 4 and 5 for flour and brown sugar and cup 6 for pepper, respectively. Then, we would contrast these combinations with the cups that we had already examined.

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Covalent and ionic bonds refer to atoms joined by their electrons. In covalent bonds, electrons are shared by the involved non-metal atoms. Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms.

Both of them, covalent and ionic bonds, are chemical bonds that can form between atoms.

Ionic bonds occur between atoms with different electronegativity. When they bind, they transfer electrons from one atom to the other creating ions with opposite charges that attract each other.

Ionic compounds are formed by anions and cations.

• Cations are positive ions derivated from metals.

• Anions are negative ions derivated from non-metals.

The metal atoms share its electrons with the non-metal ones, creating stable configurations. Ionic bonds do not create molecules.

Covalent bonds are formed between atoms share electrons to be more stable. Atoms involved share electrons equally, creating a strong bond between them.

Covalent bonds are usually formed between non-metal atoms.

Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms

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Complete question

A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.

Which of the following characteristics can be written only in space C?

On the diagram,

Options,

Answer: 216km

Explanation:

An integer simply refers to a whole number. We should note that fractions and decimals are not integers. Therefore, expressing 2.015×107km as an integer will be:

= 2.015 × 107

= 215.605

= 216

a.) The balanced equation for the reaction is:

\(H2O2 + 2H+ + 2e- → 2H2O E° = +1.78 V\\Ni2+ + 2e- → Ni E° = -0.25 V\)

b.) The balanced equation for the reaction is:

\(2H2O + Mg2+ + 2e- → H2O2 + Mg E° = -2.37 V\)

c.) The balanced equation for the reaction is:

\(2Al3+ + 3OH- → Al + 3/2O2 + 3H2O E° = +1.67 V\)

a) Assuming standard conditions of 1 M concentration for all species, the Nernst equation can be used to calculate the open circuit potential:

\(Ecell = E°cell - (RT/nF)lnQ\)

Where:

R = gas constant = 8.314 J/(mol*K)

T = temperature in Kelvin

n = number of electrons transferred in the balanced equation (in this case, 2)

F = Faraday constant = 96,485 C/mol

Q = reaction quotient =\([Ni2+]/([H2O2][H+]^2)\)

At standard conditions, Q = 1, so the equation simplifies to:

Ecell = E°cell

Ecell = +2.03 V

b) Assuming standard conditions of 1 M concentration for all species, the Nernst equation can be used to calculate the open circuit potential:

\(Ecell = E°cell - (RT/nF)lnQ\)

Where:

R = gas constant = 8.314 J/(mol*K)

T = temperature in Kelvin

n = number of electrons transferred in the balanced equation (in this case, 2)

F = Faraday constant = 96,485 C/mol

Q = reaction quotient = \([H2O2][Mg]/([H2O]^2[Mg2+])\)

At standard conditions, Q = 1, so the equation simplifies to:

Ecell = E°cell

Ecell = +2.37 V

c) Assuming standard conditions of 1 M concentration for all species, the Nernst equation can be used to calculate the open circuit potential:

\(Ecell = E°cell - (RT/nF)lnQ\)

Where:

R = gas constant = 8.314 J/(mol*K)

T = temperature in Kelvin

n = number of electrons transferred in the balanced equation (in this case, 6)

F = Faraday constant = 96,485 C/mol

Q = reaction quotient =\([Al][OH-]/([Al3+][H2O]^3)\)

At standard conditions, Q = 1, so the equation simplifies to:

Ecell = E°cell

Ecell = -1

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The nutritional component of the nuts allows them to burn easily when ignited are oils

Nutritional components refers to the six classes of food which are;

These are the components that nourish our bodies when we consume food substances.

Lipids includes fats and oils. Nuts are rich in oils. These oils contain a lot of chemical stored in chemical bonds hence they burn easily.

Therefore; the nutritional component of the nuts allows them to burn easily when ignited are oils.

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The Medal of Honor is the best navy decoration and highest volume.

The President of the USA The Victoria go is the holy grail for Medal of Honor creditors because there are the best in lifestyles. Bearing the inscription For valor and called a VC, this medal turned into first offered for conspicuous bravery' in 1856 and later backdated to the Crimean conflict of 1854. The outstanding service pass is the second maximum army ornament that may be provided to a member of the American military, for intense gallantry and risk of lifestyle in actual combat with an armed enemy force.

The Bronze Star Medal dates lower back to world battle II. these days, it is the fourth-maximum ranking award a provider member can obtain for a heroic and meritorious deed performed in an armed battle. For individuals who acquire the BSM, it's far a sign of their sacrifice, bravery, and honor at the same time as serving their us of a

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Answer:

42.9%

Explanation:

the total number of coins is 15+14+6 = 35

so to find the % of pennies, divide the number of pennies by the total number of coins and times it all by 100

15/35 x 100 = 42.9%

The percentage of pennies is 42.85 %.

We have a collection of coins.

We have to find the percentage of pennies in the collection.

One tenth of a United States dollar is labelled as dime.

According to the question -

Number of pennies n[p]= 15

Number of dimes n[d] = 14

Number of quarters n[q] = 6

Total number of coins = n[T] = n[p] + n[d] +  n[q] = 35

% of pennies can be calculated using -

(n[p] / n[T]) x 100 = (15/35) x 100 = 42.85%

Hence, the percentage of pennies is 42.85.

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Answer:

C. The sample mainly consists of granite.

Explanation:

Excavation can be defined as the process of digging out a part of a land mass (earth) either for archeological purposes or mining.

Earth crust refers to the outermost layer or thin shell which makes up the earth such as sedimentary, metamorphic and igneous rocks.

The Earth crust is typically made up of two (2) main types;

1. Oceanic crust: this crust has a thickness ranging from 5 km to 10 km and comprises of denser rocks such as diabase, gabbro and basalt.

2. Continental crust: this crust has a thickness ranging from 30 km to 60 km and comprises of minerals such as quartz, silicate, feldspar, aluminum and less dense rocks such as granite

Hence, if a scientist collects a core sample from 60 km deep in Earth. The characteristic which she will most likely observe in this sample is that, the sample mainly consists of granite because digging to a depth of 60 km would take her to the continental crust of Earth.

Answer:

C.)The sample mainly consists of granite.

Explanation:

Yourwelcome :)

Answer:

true

Explanation:

The difference in first ionization energy between Xe and Rn can be explained by the combination of differences in electron configuration and shielding effect.

The energy needed to remove one electron from an atom or ion is known as the initial ionization energy. The number of electrons in the atom and the arrangement of those electrons are two parameters that affect an element's ionization energy.

The electron configurations of the elements Rn (Radon) and Xe (Xenon) are similar, although Radon contains more electrons than Xenon. In contrast to the outermost electrons of Xenon, the outermost electrons of Radon are bound by the nucleus more securely and are therefore more difficult to remove. Because Xe has a lower initial ionization energy than Rn, it is simpler to remove one electron from Xe than from Rn.

Additionally, the shielding effect of inner electrons also affects the ionization energy. The shielding effect refers to the ability of inner electrons to screen or reduce the attraction between the nucleus and outer electrons. In Xe, there are more inner electrons than in Rn, which provides a stronger shielding effect, further reducing the ionization energy of Xe.

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer:

Na=sodium FCN=Cyanogon Flouride. NOJ =DEOXYNOJIRIMYCIN/MORANOLINE

a. The chemical equation for the electrolysis of water is:

2H2O(l) → 2H2(g) + O2(g)

b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).

c. The volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.

a. The chemical equation for the electrolysis of water is:

2H2O(l) → 2H2(g) + O2(g)

b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).

c. According to the balanced chemical equation, for every 2 moles of water (H2O) electrolyzed, 1 mole of oxygen gas (O2) is obtained. Since 1 mole of any gas occupies 22.4 L at standard temperature and pressure (STP), we can use the stoichiometry of the reaction to determine the volume of oxygen gas produced.

Given that 50 cm³ of gas is obtained at the anode, we need to convert this volume to liters:

50 cm³ = 50/1000 L = 0.05 L

Using the stoichiometric ratio of the balanced equation, we find that 2 moles of water produce 1 mole of oxygen gas. Therefore, 0.05 L of oxygen gas is equivalent to:

0.05 L × (1 mole/22.4 L) = 0.002232 moles

Thus, the volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.

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The compound above is a cyclic (ring) compound.

Organic compounds are compounds which contains carbon and hydrogen.

Some classes of organic compounds include the following:

So therefore, the compound above is a cyclic (ring) compound.

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Answer:

position

Explanation:

The position of an object is its location in a space.

The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.

sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .

sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .

so, the ratios are not the same.

Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

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