Which two nuclides are isotopes of the same element?
K and K
19
O
19
14C and ¹4N
20Na and 20 Ne
10
39K and 40 Ca
19
20

Answer: A.) It is a compound

Explanation:

Water is an inorganic compound made of water molecules, which are made of oxygen and hydrogen atoms.

It is not an element because there is no such thing as a water atom.

Water is not a chemical reaction to anything.

Water is OBVIOUSLY not a metal.

Hope this helps :)

The heat change or enthalpy change, ΔH°rxn, for the slow reaction of zinc with water is +417.7 kJ/mol.

The heat change or enthalpy change, ΔH°rxn, for the reaction of zinc (Zn) with water (H₂O) can be calculated using the standard enthalpies of formation for each species involved in the reaction.

Balanced chemical equation for the reaction is;

Zn(s) + 2H₂O(l) → Zn²⁺(aq) + H₂(g)

The standard enthalpy change for the reaction, ΔH°rxn, can be calculated as the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants, each multiplied by their respective stoichiometric coefficients;

ΔH°rxn = Σ(nΔH°f, products) - Σ(mΔH°f, reactants)

where n and m are the stoichiometric coefficients of the products and reactants, respectively, and ΔH°f is the standard enthalpy of formation.

Assuming standard conditions (25°C and 1 atm), the standard enthalpies of formation for Zn²⁺(aq) and H₂(g) are typically tabulated values. Let's assume their values to be ΔH°f(Zn²⁺(aq)) = -153.9 kJ/mol and ΔH°f(H₂(g)) = 0 kJ/mol, respectively.

The standard enthalpy of formation of water (H₂O) is -285.8 kJ/mol.

Put the values into the equation, we get;

ΔH°rxn = [ΔH°f(Zn²⁺(aq)) + ΔH°f(H₂(g)] - [ΔH°f(Zn(s)) + 2ΔH°f(H₂O(l))]

ΔH°rxn = [-153.9 + 0] - [0 + 2(-285.8)]

ΔH°rxn = -153.9 + 571.6

ΔH°rxn = 417.7 kJ/mol

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If there is sufficient fossil fuel, we will cope by utilizing it in a responsible and sustainable manner while actively transitioning towards alternative energy sources. Coping with the abundance of fossil fuels requires a multi-faceted approach that considers environmental, economic, and social aspects.

To cope effectively, we can:

1. Promote energy efficiency: Invest in technologies and practices that minimize energy waste and maximize efficiency in all sectors, including transportation, industries, and buildings.

2. Transition to renewable energy: Increase the adoption of renewable energy sources such as solar, wind, hydro, and geothermal power. This reduces our reliance on fossil fuels and mitigates environmental impacts.

3. Implement policy measures: Enact policies that incentivize the use of renewable energy, discourage excessive fossil fuel consumption, and promote sustainable practices.

4. Invest in research and development: Support and fund research efforts aimed at developing cleaner and more sustainable energy technologies, such as advanced battery storage, hydrogen fuel cells, and carbon capture and storage.

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Answer:

26

Explanation:

atomic mass=protons+neutrons

atomic mass=12+14= 26

We have that he  the relative atomic mass of an atom that contains 12 protons, 14 neutrons and 12 electrons is

Mass=26

From the question we are told

What is the relative atomic mass of an atom that contains 12 protons, 14 neutrons and 12 electrons?

Generally the equation for the relative atomic mass  is mathematically given as

Mass=protons+neutrons

Mass=12+14

Mass=26

Therefore

The  the relative atomic mass of an atom that contains 12 protons, 14 neutrons and 12 electrons is

Mass=26

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Answer:

atm

kPa

torr

mmHg

Answer:

Water sweated by water from the leaf cells evaporating into the air, which pulls water and nutrients from the leaf into the air.

3.99 g of Fe₂S₃ solid product can be made from the given amount of FeCl₃.

A balanced equation for the reaction is:

FeCl₃ (aq) + 3Na₂S (aq) → Fe₂S₃ (s) + 6NaCl (aq)

In the stoichiometry of the reaction, 1 mole of FeCl₃ reacts with 1/3 moles of Fe₂S₃, or that 3 moles of FeCl₃ react with 1 mole of Fe₂S₃.

Moles of FeCl₃ = mass / molar mass

Moles of FeCl₃ = 9.34 g / 162.2 g/mol

Moles of FeCl₃ = 0.0575 mol

Since the reaction uses 3 moles of FeCl₃ to produce 1 mole of Fe₂S₃,

Moles of Fe₂S₃ = (0.0575 mol FeCl₃) / 3

= 0.0192 mol Fe₂S₃

Mass of Fe₂S₃ = moles × molar mass

Mass of Fe₂S₃ = 0.0192 mol × 207.9 g/mol

Mass of Fe₂S₃ = 3.99 g

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The whole number mole ratio of LiCIO₄ to H₂O in the sample of the compound is 1 : 3.

The mole ratio of the reaction is the ratio in which moles of reactants combine to form moles of product.

The mole ratio of the given reaction is calculated below as follows:

Moles of LiCIO₄ present in the sample of the compound = 0.0449 mole LiCIO₄

Moles of H₂O present in the sample of the compound = 0.135 mol H₂O

To get the whole number mole ratio, we divide each mole of substance present in the sample by the smallest number of moles.

Mole ratio of  LiCIO₄ = 0.0449 mole / 0.0449 mole

Mole ratio of  LiCIO₄ = 1

Mole ratio of  H₂O = 0.135 / 0.0449

Mole ratio of  H₂O = 3

Hence mole ratio of  LiCIO₄ to H₂O in the sample = 1 : 3

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Answer:

Your answer will be (D).

Hope this helps!

Answer:

D

Explanation:

You can tell when a chemical change occurs if a gas is produced (bubbles), an odor is produced, if there is a color change, or if the surroundings get hotter or colder.

A rainbow is produced through a proces that includes refraction, reflection, and dispersion of  sunlight.

A rainbow is formed when sulinght is refracted and reflected by rain drops in the atmospher.

The sunlight is split into its component colors, which is why rainbows appear as having an array of colors. This is due to each color being bent by a different amount during refraction.

The colors of a rainbow are always in the same order, with red on the outside and violet on the inside.

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Answer:

true

Explanation:

It is because it appears uniformly in the eye

Answer:

Oxygen has 8 protons in the nucleus while nitrogen only has 7. A bonding pair will experience more attraction from the oxygen's nucleus than from nitrogen's, and so the electronegativity of oxygen is greater.

Answer:

The answer is 82

Explanation:

Dude in the stop says so

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

1.6/0.100

= 16

16 x 5

= 80

now you need to multiply as you divided before so the answer is

=.80

Your welcome

Answer: 1 mL

Explanation:

1 mL equals to 1 cm^3

Answer:

Length of ramp = 77.27ft

Explanation:

Step 1 - Sketch a diagram

Make a line about 15 deg. above the horizontal x-axis. Draw the horizontal and vertical components to form a right triangle. See image if you don’t understand.

Step 2 - Label your diagram

Your triangle creates a 15 deg. angle with the x-axis and we know the vertical distance from the top of the ramp to the ground is 20 ft.

Step 3 - Use trig to make an equation and solve

SOH CAH TOA

I’m this problem we know the angle, know “opposite, and we are solving for the hypotenuse of the triangle. Therefore, it would be easiest to use SOH or sin(theta)= (opp./hyp.) Plug in the numbers and solve for the hypotenuse.

All work is shown in the attached image.

The density of the gas is  0.0340 g/L, moles of gas in the bulb is 0.00124 mol and apparent molar mass is 111.3 g/mol.

To determine the density of the gas, use the ideal gas law:

PV = nRT

where P = pressure, V = volume, n = number of moles, R = gas constant, and T = temperature.

Since the volume and temperature are constant:

(P/n) = constant

Therefore, the density (ρ) of the gas is given by:

ρ = (m-m₀)/V = (Δm)/V

where m = mass of the bulb filled with the gas, m₀ = mass of the evacuated bulb, and Δm = m - m₀ is the mass of the gas.

Substituting the given values:

Δm = 22.651 g - 22.513 g = 0.138 g

V = 4.050 L

ρ = 0.138 g / 4.050 L = 0.0340 g/L

To find the number of moles of gas in the bulb, use the equation:

n = PV/RT

Substituting the given values:

n = (0.0250 atm)(4.050 L) / (0.0821 L·atm/mol·K)(289.2 K) = 0.00124 mol

Finally, to find the apparent molar mass of the gas, use the equation:

M = m/n

where M = molar mass of the gas and m = mass of the gas.

Substituting the given values:

M = 0.138 g / 0.00124 mol = 111.3 g/mol

Therefore, the density of the gas is 0.0340 g/L, there are 0.00124 mol of gas in the bulb, and the apparent molar mass of the gas is 111.3 g/mol.

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Answer:

Explanation:

The number of moles can be calculated by dividing the number of molecules by Avogadro's number (6.022 x 10^23 molecules/mol).

So, for 8 x 10^23 molecules of sodium, the number of moles would be:

8 x 10^23 molecules / 6.022 x 10^23 molecules/mol = 1.331 moles.

Therefore, there are 1.331 moles in 8 x 10^23 molecules of sodium.

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Answer:

I'm pretty sure this is a question about your opinion so there is no wrong answer! Just think about the question and if you were in those shoes. There is no right or wrong answer! :)

Explanation:

Answer:

There are 14 protons

There are 14 neutrons

Explanation:

Here, we want to get the number of protons and neutrons in the atom

Firstly, the atomic number is the same as the number of protons in the atom

That means, the atom has 14 protons

Mathematically, the sum of the number of protons and the number of neutrons equal the mass number

Thus:

Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

The shorthand or noble gas electron configuration for tellurium (Te) is [Kr]5s²4d¹⁰5p⁴.

The electron configuration of Te describes the arrangement of its electrons in different energy levels and orbitals. The electron configuration notation is a shorthand method for writing the distribution of electrons among different shells and subshells.

Te has an atomic number of 52, meaning that it has 52 electrons distributed among its different shells and subshells. The first two electrons of Te occupy the 1s subshell, the next two electrons occupy the 2s subshell, and the next six electrons occupy the 2p subshell.

The following ten electrons occupy the 3d subshell, and the next two electrons occupy the 4s subshell. After that, ten electrons occupy the 4d subshell. The remaining six electrons are found in the 5p subshell.

The noble gas electron configuration for Te is [Kr]. This means that Te's outermost shell is similar in electron configuration to that of Kr, which is a noble gas. The noble gas electron configuration for Te indicates that its outermost shell contains six valence electrons (5s²5p⁴), which can participate in chemical reactions.

The full configuration including the noble gas indicates that the outermost electrons for Te are in the p subshell, which is useful for predicting reactivity.

In summary, the noble gas electron configuration for tellurium is [Kr]5s²4d¹⁰5p⁴. This notation helps to describe the electron arrangement of Te in a concise manner and indicates that the outermost shell of Te is similar to that of Kr, which is a noble gas.

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Answer:

The solubility of gases depends on the pressure: an increase in pressure increases solubility, whereas a decrease in pressure decreases solubility. This statement is basically Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution. This can be expressed in the equation:

s=k×Pgas

where s is solubility in M

k is Henry's constant in M/atm

P is the vapor pressure of the gas over the solution

Another way of explaining this is that higher pressures lead to greater force in collisions between the gas particles above the solution and the solution itself. Their average kinetic energy is greater, and their average speeds are greater.  So it is more likely that some of the particles will go into the solution and get dissolved.

The amount of energy required to heat the given amount of lead from 18°C to 44°C is 638.976 J.

The specific heat capacity of lead is 0.128 J/g°C.

To calculate the amount of heat energy required to heat 192 grams of lead from 18°C to 44°C, we can use the formula:

Q = m × c × ΔT

where:

Q = heat energy (in Joules)

m = mass of the substance (in grams)

c = specific heat capacity of the substance (in J/g°C)

ΔT = change in temperature (in °C)

Plugging in the given values:

m = 192 g

c = 0.128 J/g°C

ΔT = (44°C - 18°C) = 26°C

Q = 192 g × 0.128 J/g°C × 26°C

Q = 638.976 J

So, the amount of heat energy required to heat 192 grams of lead from 18°C to 44°C is 638.976 Joules.

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Remember that STP stands for standard temperature and pressure.

The first thing to do is to use molar volume to convert from litres to moles.

You are given the volume of He, which is 56.0 ml. First convert this to litres. This is equal to 0.056L.

We know that 1 mol = 22.4L.

Next, take the volume in litres of He and divide it by 22.4L.

so 0.056/22.4 = 0.0025 moles of He

The amount of heat released from the system as the pentane cools is 67.5kJ.

To determine the heat released from the system as the pentane cools, we need to consider the heat absorbed or released during each of the phase changes (vaporization and fusion) as well as the heat absorbed or released during the temperature change of the substance in each phase.

The heat absorbed or released during a phase change can be calculated using the enthalpy of vaporization (AHvap) or enthalpy of fusion (AHfus) and the number of moles of substance undergoing the phase change.

The heat absorbed or released during a temperature change can be calculated using the specific heat of the substance and the number of moles of substance and the temperature change.

In this case, we can first calculate the heat absorbed or released during the vaporization of the pentane:

Heat = ΔHvap * moles

Heat = 45.3 kJ/mol * 144.29 g / (58.12 g/mol) = 102.1 kJ

Next, we can calculate the heat absorbed or released during the cooling of the pentane vapor to the melting point:

Heat = specific heat * moles * temperature change

Heat = 168 J/mol K * 144.29 g / (58.12 g/mol) * (117 - (-84)) K = 68400 J = 68.4 kJ

Then, we can calculate the heat absorbed or released during the fusion of the pentane:

Heat = ΔHfus * moles

Heat = 120 kJ/mol * 144.29 g / (58.12 g/mol) = 270 kJ

Finally, we can calculate the heat absorbed or released during the cooling of the pentane from the melting point to the final temperature:

Heat = specific heat * moles * temperature change

Heat = 168 J/mol K * 144.29 g / (58.12 g/mol) * (-84 - (-84)) K = 0 J

The total heat released from the system can be calculated by adding up the heat absorbed or released during each of these processes:

Total heat = 102.1 kJ + 68.4 kJ + 270 kJ + 0 kJ = 440.5 kJ

The correct answer is therefore D) 67.5 kJ.

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Answer:

Earth is not an inertial reference frame because the Earth rotates and is accelerated with respect to the Sun.

Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.