Which of the following is an example of a chemical property?
a.Boiling point

b.Melting point

c.Electric conductivity

Decomposition caused by heat

Answer:

0.215 L HCl

Explanation:

Using the relationship (M1 x V1 = M2 x V2) between Molarity (M) and Volume (v or L), we can find the volume of the 2nd volume amount.

First we rearrange our relationship equation to: \(V_2 = \frac{M_1 * V_1 }{M_2}\)

Now, plug in the values. \(V_2 = \frac{0.2 * 2.8}{2.6}\)

Calculating these values, we end up with the answer:

0.215 L HCl

Compared to size of its nucleus, the size of an atom is about

E. a thousand times greater

The size of an atom is much larger compared to the size of its nucleus. The nucleus of an atom contains protons and neutrons, which are tightly packed together in a small region. The electrons, on the other hand, occupy a larger space around the nucleus and contribute to the overall size of the atom. Therefore, the size of an atom is approximately a thousand times greater than the size of its nucleus.The electrons in an atom occupy electron orbitals that extend far beyond the size of the nucleus. The nucleus is extremely small and dense in comparison. This size difference is due to the distribution of electron cloud around the nucleus, making the atom much larger than its nucleus.

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Answer:

c

Explanation:

Answer:

the answer of the question is C

The balanced net ionic equation for the setup with a Zn electrode in a 1.0 M aqueous  Zn²⁺ solution on the left side and an Ag electrode in a 1.0 M aqueous Ag⁺ solution on the right side with a salt bridge added can be represented as follows: Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s)

In this setup, zinc metal (Zn) is oxidized and loses electrons at the anode to form zinc ions (Zn²⁺), while silver ions (Ag⁺) from the silver salt solution (AgNO₃) gain electrons at the cathode to form silver metal (Ag). The salt bridge is necessary to maintain electrical neutrality in both half-cells by allowing the transfer of anions and cations between them.

The balanced net ionic equation above represents only the species involved in the redox reaction, with the spectator ions (NO₃⁻ and Cl⁻) omitted. It also indicates the physical states of the reactants and products, with (s) representing solid, (aq) representing aqueous, and (l) representing liquid.

In summary, the balanced net ionic equation for the setup described is Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s), where zinc metal is oxidized at the anode and silver ions are reduced at the cathode, with a salt bridge facilitating the transfer of ions between the two half-cells.

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Answer:

Surface water and groundwater systems are connected in most landscapes. ... It is the groundwater contribution that keeps streams flowing between precipitation events or after snowmelt. For a stream to gain water, the elevation of the water table in the vicinity of the stream must be higher than the streamwater surface.

Explanation:

Answer:  The biology or linguistic  term?

Explanation: The introduction of a plant or animal to a region where it is not indigenous.

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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As you transitioned from a solid to liquid to gas, the speed of your particles increased, distance between them grew and their arrangement became more disordered.

If you were placed on a hot sidewalk, you would experience conduction as the heat transferred from surface to your body.

As a result, you would turn into liquid water, and particles in your structure would begin to move faster, increase distance between them, and become more disordered. This is because the added heat increases the energy in particles, causing them to break away from their frozen state and become more fluid.

If you were exposed to the sun or another heat source, you would experience radiation as energy in form of electromagnetic waves traveled through space and heated your body.

And as a result, you would turn into gas and particles in your structure would increase in speed, become more spaced apart, and become even more disordered. This is because additional energy from heat causes particles to move around more rapidly, leading to breakdown of any remaining structure.

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A liquid is allowed to evaporate and leaves no residue. It can not be determined whether it was an element, a compound, or a mixture.

A water vapor molecule stays roughly 10 days in the atmosphere after it has evaporated. Water vapor starts to cool back down as it ascends higher in the atmosphere. The water vapor condenses when it becomes cold enough, turning it back into liquid water. Eventually, individual water droplets will condense to create clouds and precipitation.

It is not possible to determined whether it would be an element, a compound and mixture because the size of the particle will be too less.

A method for separating homogenous mixtures with one or even more dissolved salts is called evaporation. The procedure separates the liquid from the solid components. Usually, the procedure entails heating the combination until there is no more liquid is present.

Therefore, it can not be possible to determined whether it was an element, a compound, or a mixture by evaporation.

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573,213 Joules of energy is required to raise the temperature of the hydrogen gas from 0.0°C to 30.5°C.

To calculate the energy required to raise the temperature of the hydrogen gas, we can use the equation:

ΔE = n * Cv * ΔT

where:

ΔE is the change in energy,

n is the number of moles of gas,

Cv is the molar heat capacity at constant volume,

ΔT is the change in temperature.

First, we need to calculate the number of moles of hydrogen gas using the ideal gas law:

PV = nRT

where:

P is the pressure,

V is the volume,

n is the number of moles,

R is the ideal gas constant,

T is the temperature.

Rearranging the equation, we have:

n = PV / RT

Given:

P = 10.0 atm

V = 239 L

R = 8.314 J/(mol·K)

T1 = 0.0°C = 273.15 K (convert to Kelvin)

T2 = 30.5°C = 303.65 K (convert to Kelvin)

Cv = 20.4 J/(mol·K)

Now, let's calculate the number of moles of hydrogen gas:

n = (10.0 atm * 239 L) / (8.314 J/(mol·K) * 273.15 K)

n ≈ 92.05 moles

Next, we can calculate the change in energy using the equation mentioned earlier:

ΔE = n * Cv * ΔT

ΔE = 92.05 moles * 20.4 J/(mol·K) * (303.65 K - 273.15 K)

Calculating this expression will give us the energy required to raise the temperature of the hydrogen gas.

ΔE ≈ 573,213 J

Therefore, approximately 573,213 Joules of energy is required to raise the temperature of the hydrogen gas from 0.0°C to 30.5°C.

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Concentrated sodium hydroxide (NaOH) must be treated with caution because it is corrosive. Option B is the correct answer.

Concentrated sodium hydroxide, commonly known as caustic soda or lye, is a highly corrosive substance. Corrosive substances have the ability to cause damage or destruction to living tissues upon contact. In the case of sodium hydroxide, it can cause severe burns and tissue damage if it comes into contact with the skin, eyes, or respiratory system.

While sodium hydroxide is a strong base, it is not flammable or a strong oxidizer. Flammable substances are capable of catching fire, but sodium hydroxide does not have this property. Strong oxidizers are substances that readily give off oxygen or accept electrons to facilitate combustion, but sodium hydroxide is not classified as a strong oxidizer.

Option B) Corrosive is the correct answer.

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7g/mL

Density is a measure of mass per volume.

Density Formula

The density formula is  \(\displaystyle D=\frac{m}{V}\) where m is the mass in grams (g) and V is the volume in milliliters (mL). The way I learned the formula was that the m over the V looks like a heart when written out.

We can plug the mass and volume we were given to solve for density.

\(\frac{14}{2}\) equals 7. So, the density must be 7 grams per milliliter (g/mL).

Density Units

The units for density are important. You will not get the correct answer if you do not include your units. There are multiple ways to express density, but it is most common to have g/mL.

Additionally, density should always have the volume measurement in the denominator. This means that density will never be written in mL/g.

DADP is a nucleotide composed of deoxyadenosine, a nitrogenous base, a pentose sugar, and two phosphate groups attached to the 5' carbon. Nucleosides are organic molecules formed by the combination of a nitrogenous base with a pentose sugar. Ribonucleosides are when the pentose sugar is deoxyribose and deoxyribonucleosides when it is deoxyribose.

DADP (Deoxyadenosine 5'-diphosphate) is a nucleotide composed of deoxyadenosine, a nitrogenous base (adenine), a pentose sugar (deoxyribose), and two phosphate groups attached to the 5' carbon. Nucleosides are organic molecules formed by the combination of a nitrogenous base with a pentose sugar (five-carbon sugar). Ribose is when the pentose sugar is ribose, while deoxyribose is when the pentose sugar is deoxyribose. A nucleoside has no phosphate group, while a nucleotide consists of a nucleoside and a phosphate group.

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Option a is false, option b is true and option is false. The second law of thermodynamics does not state that entropy is conserved.

(a) False. The second law of thermodynamics states that the total entropy of an isolated system can only increase or remain constant over time, but not decrease. Entropy is not conserved, but tends to increase. Other options are incorrect because they may misinterpret the concept of entropy conservation.

(b) True. In a reversible process, the system's entropy increase is balanced by the surroundings' entropy decrease by the same amount. This ensures that the total entropy change of the universe remains zero, which is a characteristic of a reversible process. Other options are incorrect because they may not account for the reversibility condition.

(c) False. In a spontaneous process, the total entropy change of the universe must be positive. While the system may undergo an entropy change of 4.2 J/K, the surroundings' entropy change should be greater than 4.2 J/K to ensure a positive total entropy change. Other options are incorrect because they may assume that the entropy changes of the system and surroundings must be equal and opposite, which is not the case for spontaneous processes.

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Answer:

What do you do with a sick chemist? If you can't helium, and you can't curium, then you might as well barium!

Explanation:

there

Answer:

why can you never trust a atom?

Because they literally make up everything

(i am so sorry for this lol)

Answer:

Mass  = 8 g

Explanation:

Given data:

Mass of MgO formed  = 20 g

Mass of oxygen needed = ?

Solution:

Chemical equation:

2Mg + O₂     →    2MgO

Number of moles of MgO:

Number of moles = mass/molar mass

Number of moles = 20 g/ 40 g/mol

Number of moles = 0.5 mol

Now we will compare the moles of MgO and O₂ from balance chemical equation:

                     MgO         :            O₂

                        2            :            1

                      0.5          :        1/2×0.5 = 0.25 mol

Mass of oxygen required:

Mass = number of moles × molar mass

Molar mass of O₂  is 32 g/mol

Mass = 0.25 mol × 32 g/mol

Mass = 8 g

For n=1, ∫Ψ* Ψ d³x = 1

The ground state wavefunction of hydrogen satisfies the normalization condition ∫Ψ* Ψ d³x = 1.

To show that the ground state hydrogen wavefunction is properly normalized, we need to calculate the integral of the wavefunction squared, Ψ², over all space and demonstrate that it equals 1.

The ground state wavefunction of hydrogen is given by:

Ψ(r) = (1/√πa₀³) \(e^(^-^r^/^a^_0)\)

where a₀ is the Bohr radius.

To show normalization, we evaluate the integral:

∫ Ψ*(r) Ψ(r) d³r

where Ψ*(r) represents the complex conjugate of Ψ(r).

Substituting the expression for Ψ(r), we have:

∫ (1/√πa₀³) \(e^(^-^r^/^a^_0)\)      (1/√πa₀³) \(e^(^-^r^/^a^_0)\) d³r

Expanding the product and rearranging the terms, we get:

(1/π²a₀⁶) ∫ \(e^(^-^2^r^/^a^_0)\) d³r

The integral represents the volume integral over all space, so we can rewrite it as:

(1/π²a₀⁶) ∫∫∫  \(e^(^-^2^r^/^a^_0)\) dxdydz

Since the wavefunction is spherically symmetric, we can use spherical coordinates for the integral. The volume element in spherical coordinates is given by r² sin(θ) dr dθ dφ.

Therefore, the integral becomes:

(1/π²a₀⁶) ∫∫∫  \(e^(^-^2^r^/^a^_0)\) r² sin(θ) dr dθ dφ

To solve the integral, we perform the integration in each coordinate:

∫∫∫  \(e^(^-^2^r^/^a^_0)\) r² sin(θ) dr dθ dφ = ∫ [0,∞]  \(e^(^-^2^r^/^a^_0)\) r² dr ∫ [0,π] sin(θ) dθ ∫ [0,2π] dφ

The φ integral gives 2π, and the θ integral gives 2.

∫ [0,∞]  \(e^(^-^2^r^/^a^_0)\) r² dr = (\(-a_0^3^/^8\)) [ \(e^(^-^2^r^/^a^_0)\) (2r² + 2r\(a_0\) + \(a_0^2\))]

Evaluating this integral from 0 to ∞ gives a_0^3/8.

Thus, the integral becomes:

(1/π²a₀⁶) (\(-a_0^3^/^8\)) (2)(2π)

Simplifying, we get:

(1/π²a₀⁶) (\(a_0^3\)/4π)

The π terms cancel out, and we are left with:

1/(2\(a_0^3\) )

This value is equal to 1, confirming that the ground state hydrogen wavefunction is properly normalized.

Therefore, the ground state wavefunction of hydrogen satisfies the normalization condition ∫Ψ* Ψ d³x = 1, demonstrating that it is properly normalized.

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Room temperature is an example of a variable. It is not an attribute and can change based on various factors such as weather conditions, heating or cooling systems, and human activities. As a variable, room temperature can be measured and observed at different points in time, and its value can fluctuate within a certain range.

Room temperature is considered a variable because it can vary and change over time. It is not a fixed attribute of a room but rather influenced by external factors. Room temperature can be affected by the weather outside, the efficiency of heating or cooling systems, and human activities within the room. For example, during a hot summer day, the room temperature may be higher due to the heat outside, and it may decrease when an air conditioning system is turned on. Similarly, the temperature can increase when a heater is activated during cold weather. Thus, the value of room temperature is not constant and can be different at different points in time.

Moreover, room temperature can be measured and quantified using thermometers or other temperature sensing devices. It is often expressed in degrees Celsius (°C) or Fahrenheit (°F). By monitoring and recording room temperature, one can observe its fluctuations and understand its impact on comfort, energy consumption, or other relevant factors. This ability to measure and track the value of room temperature further emphasizes its variable nature.

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The net entropy change of the gas and its environment during the cycle is zero, as it is a closed cycle.

The net entropy change of the gas and its current circumstance during the cycle displayed in the p-V outline can't be resolved exclusively from the data given. Nonetheless, since process b-c is isothermal, the entropy change of the gas during that interaction is given by Q/T, where Q is the intensity consumed by the gas and T is the outright temperature at which the cycle happens. Since the interaction is isothermal, T is steady, so the entropy change of the gas during b-c is relative to Q. Assuming Q is positive, the entropy change of the gas is positive, implying that the gas ends up being more scattered during that cycle.

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The complete question is:

An ideal gas is taken around the cycle shown in this p-V diagram, from a to btoc Pb and back to a. Process b c is isothermal. What can you conclude about the net entropy change of the gas and its environment during the cycle? a) It is zero. b) It is positive c) It is negative. d) Two of A, B, and C are possible. e) All three of A, B, and C are possible 0 Two point charges and a point P lie at the vertices of an equilateral triangle as shown. Both point charges have the same magnitude q but opposite signs. There is nothing at point P. The net electric field that charges #1 and #2 produce at point P is in a) the ty-direction b) the-y direction c) the +x-direction. d) the-x-direction. ) none of the above. ) Charge #1 -q +q Charge #2 Constants R 8.314 mol K Isochoric Isobaric sothermal Adiabatic Constant Constant Constant No heat volume pressure temperature transfer Cice = 2.00e3 kg c steam2.00e3 kg c for water = 33.Se4 し,for water = 226e5 Na = 6,022e23- (efficiency) (carnot efficiency) On QH molecules .nole (adiabats only) (adiabats only) Nm pyr = constant TV"-1 = constant W71İ(pik-P2V2) (adiabats only) Any other needed constants should be given in the problems Heat and Temperature TKelvin = TCelcius + 273.15 EtotalB Misc Density 1 Dimension Thermal properties of matter Uniform (p+ (V-nb) = nRT NonUniform dm dL For Ideal Gas dm dA Ker = nRT (for degrees of freedom f) dv Valatonn.-5, Ynonatomic = 3 nonconservative forces-ΔΕ AL-Texternalt

Answer:

Basic or alkaline

Explanation:

ph 7 is neutral

below 7 is acidic

above 7 is basic or alkaline

Answer:

\(\boxed {\boxed {\sf Weak \ base}}\)

Explanation:

The pH scale which classifies a solution's acidity or basicity.

We are given a reading of 8. This is above 7, but not much greater. Therefore, it could be classified as a weak base.

Answer:

D i belive

Explanation:

The hydroxide will precipitate when solid NaOH is added to the solution at a pH greater than or equal to 14 .

The precipitation of hydroxide ions occurs when the concentration of hydroxide exceeds the solubility product constant (Ksp). In this case, both hydroxides MOH and M'OH2 have the same Ksp value of 1.39 × 10^−12.

When solid NaOH is added to the solution, it dissociates to release hydroxide ions (OH-) into the solution. The pH of the solution will increase as more hydroxide ions are present.

At a pH of 14, the concentration of hydroxide ions is equal to 1.0 × 10^−14 M. If this concentration exceeds the Ksp value of 1.39 × 10^−12, precipitation of hydroxide ions will occur.

Therefore, when solid NaOH is added to the solution, the hydroxide will precipitate at a pH of 14 or higher.

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Answer: (B) −198 kJ.

Answer:

Non-zero digits are always significant.

Explanation:

A final zero or trailing zeros in the decimal portion ONLY are significant.

The trend in ionization energies shows that it becomes increasingly difficult to remove an electron from an atom as the ionization energy increases. In this case, the first ionization energy of element x is relatively low at 590 kj·mol-1, indicating that it is relatively easy to remove the outermost electron. However, the second ionization energy is much higher at 1145 kj·mol-1, indicating that it is more difficult to remove the second electron. The third ionization energy is even higher at 4912 kj·mol-1, indicating that it is extremely difficult to remove a third electron.

This suggests that element x is a metal with three valence electrons, and the most likely formula for its stable ion is x2+. This is because the first two electrons are relatively easy to remove, forming the x+ ion, but removing a third electron requires a much higher amount of energy, resulting in a stable ion with a 2+ charge. Therefore, the correct answer is (b) x2.

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Answer:

Natures such as plants captures the suns energy and make their food through photosynthesis while Organisms get it energy by eating food

Explanation:

Photosynthesis is the act of transforming sunlight into energy. This is what plants (or natures) do to make their food.

In comparison, animals (or organisms) have to eat their food either by eating the plants (herbivores) or through other animals (carnivores)

This creates a food chain that energy travels down.

I hope this is what you were looking for, the grammar is a little confusing.

Mixing hydrochloric acid (HCl) and potassium cyanide (KCN) can indeed form a toxic gas. When HCl and KCN are combined, they react to form hydrogen cyanide gas (HCN).

Hydrogen cyanide is a highly toxic gas that can cause rapid asphyxiation due to its ability to bind to hemoglobin in the blood and prevent oxygen from being transported to the body's tissues. Inhaling even small amounts of hydrogen cyanide gas can be fatal.

It's important to note that this reaction should be handled with extreme caution, as both HCl and KCN are highly corrosive and toxic substances. It's not recommended to mix these substances, and if it is necessary to do so, appropriate safety precautions should be taken, such as wearing protective gear and handling the substances in a well-ventilated area.  

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Al3+ ion=13−3=10  

As it is formed from the neutral atom by a loss of 3 electrons.

It is formed from the neutral atom by a loss of 3 electrons.

Given that, charge = + 3,

mass number = 27 and number of neutrons = 14

Number of protons = atomic number

Atomic number = mass number - number of neutrons = 27-14 = 13

This is the atomic number of aluminium.

Therefore, this element is aluminium (Al).

Number of electrons in the Al atom = 13 Number of electrons in the

Al3+ ion=13−3=10

. As it is formed from the neutral atom by a loss of 3 electrons.

Neutrons, along with protons, are subatomic particles found inside the nucleus of every atom. The only exception is hydrogen, where the nucleus contains only a single proton. Neutrons have a neutral electric charge (neither negative nor positive) and have slightly more mass than positively charged protons. Electron, proton, neutron are subatomic particles which build the atom. The atom consists of a central nucleus containing neutron and proton. Electrons revolve around the nucleus. Electrons are negatively charged, proton is positively charged and neutron is neutral.The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

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