Which is a better conductor of heat: air or a copper wire? Why?

I believe this is the electric configuration for magnesium, so, In writing the electron configuration for Magnesium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for magnesium go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining two electrons in the 3s. Therefore the Magnesium electron configuration will be 1s22s22p63s2.

The answer is B

The entity which is represented by X in the partial electron configuration of an atom with 12 electrons as shown in 1s² 2s² 2p⁶ X is; 3s²

According to the question, the partial electronic configuration of an atom with 12 electrons is shown as follows;

According to the Aufbau's principle, electrons are filled into orbitals with the lowest energy before those of higher Energy are filled.

The shell with energy level 2 has 2 subshells(orbitals) namely the 2s and 2p orbitals with a maximum of 2 and 6 electrons respectively.

The 2 electrons left will be filled into the 3s orbital.

Therefore, X represents 3s².

The electronic configuration is therefore;

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Answer is:  a bottle of acetic acid contains a solid.

Acetic or ethanoic acid (CH₃COOH) when undiluted is called glacial acetic acid.

Glacial acetic acid has freezing point (melting point) around 16.6°C, so it will be at solit state.

Vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar  is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.

Acetic acid dissociate in aqueous solution to form hydrogen ions (H⁺) and acetic anion (CH₃COO⁻).

Balanced chemical reaction (dissociation):  

CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).

Luster, the way light interacts with the surface of a material, is a physical property. It describes a characteristic of the material itself, unrelated to chemical reactions. An example is the high luster of diamond due to exceptional light reflection.

Luster refers to the way light interacts with the surface of a substance or material, such as a mineral. It is considered a physical property, not a chemical property, because it describes something about the material itself, and not how it reacts with other substances or changes its composition. For example, a diamond has a high luster due its excellent ability to reflect light, which is a quality inherent to the physical structure of the diamond and not related to any chemical reactions.

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Answer : The length of pencil in inches are 7.48 inches.

Explanation :

The conversion used form centimeter to inch is :

[tex]1in=2.54cm[/tex]

As we are given that the length of the pencil is 19 cm. Now we have to determine the length of the pencil in inches.

As, 2.54 centimeter length of pencil = 1 inch

So, 19 centimeter length of pencil = [tex]\frac{19cm}{2.54cm}\times 1inch=7.48inches[/tex]

Therefore, the length of pencil in inches are 7.48 inches.

Penny has a pencil that is 19 cm long. Penny's pencil is 7.48 inches long.

To convert centimeters to inches, use the conversion factor that is  1 inch is equal to 2.54 centimeters.

To find out how long the pencil is in inches, divide the length of the pencil in centimeters by the conversion factor as follows:

Length in inches is equal to the ratio of Length in centimeters to the Conversion factor.

The calculation for length in inches:

Length in inches = 19 cm / 2.54 cm/inch

Length in inches = 7.48 inches

Therefore, Penny's pencil is 7.48 inches long.

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The total number of digits that are counted while performing a measurement, are called significant figures or significant numbers. In a measured number, all the digits are certain except the last digit. The last digit which is uncertain in a measured number is called estimated digit. In the measurement 543.1267 inches, the last digit 7 is estimated digit. While taking into account the total number of significant figures, we count all the certain digits plus the estimated digit. Therefore, the number 543.1267 has 7 significant figures.

Final answer:

In the measurement 543.1267 inches, the estimated digit is 7 since it's the least significant digit in the sequence and is beyond the smallest marked unit of the measuring tool, thus it must be estimated.

Explanation:

In the measurement 543.1267 inches, the estimated digit is the 7. This is because in any measurement, the last digit that you report is always an estimated digit. The least significant digit is this estimated digit. To understand this concept, consider a ruler which may not have exact markings below a certain decimal place. In such cases, the smallest digit marked on the instrument is known for certain, while the next smallest digit—or the digit beyond the smallest marked unit—is considered to be an estimate.

For example, using a ruler with millimeter markings, if the length measured is between two marks, the measurer can be certain of the millimeters but would estimate the tenths of a millimeter. This principle helps to understand the accuracy of the measurement, which is critical for various scientific and technical applications. Thus, in the given measurement of 543.1267 inches, the digit 7 represents a level of precision that must have been estimated based on the granularity of the measuring tool.

A. a mixture is a combination of two or more substances in which each substance retains its own properties.

water is a covalent compound which is formed by the covalent bonding between hydrogen and oxygen atoms.

Explanation:

1) Is imposible to determine an element from a simple drawing, more information is need or a higher level of details. Also, a "red blob of atoms" sounds like the  description of a molecule (a union of two or more atoms) that may or may not be formed by only one element.

2) There are 92 natural elements, the other ones are synthetic and/or radioactive. You can identify them in the periodic table because their molecular weights are between ( ).

3) False, a molecule is a particular arrangement of atoms that can be from one or more elements. An element is a particular arrangement of atomic particles (neutrons, protons and electrons.)

Boil the water to get remove the salt and then use filter paper to remove the microorganisms

Answer:

The answer is reverse osmosis!

Explanation:

I chose this on a test and got it right

Final answer:

The 93Nb+3 ion has 41 protons, 52 neutrons (assuming the most common isotope of Nb-93), and 38 electrons.

Explanation:

To determine the number of protons, neutrons, and electrons in the 93Nb+3 ion, we use the periodic table to find niobium's (Nb) atomic number and mass number. The atomic number, which is the same as the number of protons, is 41 for niobium. The ion has a 3+ charge (Nb+3), meaning it has lost 3 electrons compared to the neutral atom. Since the neutral atom has the same number of protons and electrons, the Nb+3 ion has 41 protons and 41 - 3 = 38 electrons.

To find the number of neutrons, we need additional information such as the isotope's mass number. However, this was not provided in the question. Typically, we could use the most common isotope for niobium, which is Nb-93 (mass number 93), where the number of neutrons is the mass number minus the atomic number: 93 - 41 = 52 neutrons.

Assuming the most common isotope and no additional isotopic information, the 93Nb+3 ion contains 41 protons, 52 neutrons, and 38 electrons.

The nucleus of the atom is the region which is surrounded by orbits of electrons around it. The central area of the atom is called as its nucleus which usually contains protons and neutrons in it. These are called subatomic particles of the atom, which includes proton, electron and neutron.

Protons are positively charged species, neutrons are neutrally charged they do not have any charge on it whereas electrons are negatively charged species. The number of protons and electrons is same in a particular specific elemental atom.

full moon fasholi. woodgang

When the Moon is positioned between the Sun and Earth, we see a new moon.

A new moon is where the moon is covered by the sun, invisible to the human eye.

Or, c.

Explanation:

Flammability is defined as the ability of a substance to easily catch fire.

A substance that is poisonous in nature which might even lead to death is known as a toxic substance.

When one mole of a substance oxidizes completely then the heat released is known as heat of combustion.

Compressibility is defined as the ability of a substance to reduce in size.

Hence, we can conclude the terms are matched with the example that shows its definition are as follows.

Answer. Statement A is correct statement.

Explanation:

Thomson in his experiment  named Cathode Ray Experiment he found that many of the metals release cathode rays which are negatively charged due to the presence of negatively charged subatomic particles that is electrons.

Rays were allowed to pass between the two oppositely charged plates, he observed that the rays were attracted towards positively charged plates and got repelled by the negatively charged plate.

From which he concluded that the atoms contain small, negatively charged particles known as electrons.

So from the statements provided in the question only statement A tells us about the the observation made by the Thomson in his cathode ray experiment where as other three statements are not in agreement with those observations.

J.J. Thomson's experiments with the cathode ray showed that atoms contain small, negatively charged particles.

The evidence from J.J. Thomson's experiments with the cathode ray that led to the plum pudding model of the atom was option A. The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.

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To determine the empirical formula of a compound with 63.65% nitrogen and 36.35% oxygen, calculate the moles of each element based on their mass percentages and atomic masses. After finding moles, derive the simplest ratio which provides the empirical formula N₂O.

Finding the Empirical Formula

To find the empirical formula of a compound with 63.65% nitrogen and 36.35% oxygen by mass, we will need to perform a few calculations. First, we assume we have 100 grams of the compound. This makes it easy to convert percentage to grams directly, so we have 63.65 grams of nitrogen and 36.35 grams of oxygen. Next, we divide the mass of each element by its atomic mass to find the number of moles of each element: nitrogen (N) has an atomic mass of approximately 14.01 g/mol, and oxygen (O) has an atomic mass of approximately 16.00 g/mol.

For nitrogen: 63.65 g N / 14.01 g/mol N = 4.54 mol N
For oxygen: 36.35 g O / 16.00 g/mol O = 2.27 mol O

Then, we find the simplest ratio of the moles of each element by dividing each by the smallest number of moles we calculated:

Ratio of N to O is 4.54 mol N / 2.27 mol O = 2. Since we are looking for the simplest whole number ratio, the empirical formula is N₂O.

Hey there. I did not build a model for you. Below is a picture of a Plant Cell that you could get some ideas from.

Best Of Luck,

     - Ari -

A plant cell is a type of cell found in green plants that is responsible for photosynthesis. It contains a cell wall, chloroplasts, and a central vacuole, which distinguish it from animal cells. Plant cells also include plastids and typically do not have lysosomes or centrosomes.

A plant cell is a type of cell found in green plants that is responsible for performing photosynthesis. It contains various elements that distinguish it from animal cells. Major components include:

Unlike animal cells, plant cells also contain plastids and do not usually have lysosomes or centrosomes.

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Answer:

The answer is 12,560  

Explanation:

The orbital period is the time a given cosmic question takes to finish one circle around another protest and applies in space science as a rule to planets or space rocks circling the Sun, moons circling planets, exoplanets circling different stars, or double stars. Mercury, for instance, has an orbital time of 88 days while it takes Jupiter around 11.86 years. The time of the Earth's circle is generally thought to be 365 days as timetables appear.

Answer:

12,560 m/s.

Explanation:

The question is missing:

What is the tangential speed of the satellite?

Tangential speed (Vt) is defined as the length of the arc (s) covered per unit of time (t), that is:

Vt = s/t

The period specifies the time the satellite takes to complete the orbital. The whole circumference has an arc length of 2*π*radius. Replacing into the equation:

Vt = 2*π*4*10^10 m /(2*10^7 s)

Vt = 12,560 m/s

The mass of the new solution is 35.7 g.  

Step 1. Calculate the moles of CaCl₂ in the first solution.  

[[tex]\text{Moles of CaCl}_{2} = \text{0.015 00 L solution} \times \frac{\text{3.22 mol CaCl}_{2}}{\text{1 L solution }} = \text{0.048 30 mol CaCl}_{2}\\[/tex]  

Step 2. Calculate the mass of CaCl₂.  

[tex]\text{Mass of CaCl}_{2} = \text{0.048 30 mol CaCl}_{2} \times \frac{\text{110.98 g CaCl}_{2} }{\text{1 mol CaCl}_{2} } = \text{5.360 g CaCl}_{2} \\[/tex]  

Step 3. Calculate the mass of the new solution.

[tex]\text{Mass of solution }= \text{5.360 g CaCl}_{2} \times \frac{\text{100 g solution }}{\text{15.00 g CaCl}_{2} } = \textbf{35.7 g solution} \\[/tex]  

CO32- and OH- are the two most common anions in antacids.

Answer:

negative ions.:

Hydroxyde ion (OH-)

Carbonate ion. (CO3 -- )

Explanation:

Acids generally, when are mixed in water, produces a lot of positive hydrogen protons, also knew as protons (H +) are responsible for raising the pH.

pH is (power of hydrogen), it means the more positive hydrogens ions more acid will be that substance. So the antacid's role, to neutralize these positive charges is to add more negative ions to the solutions.

In the stomach, when the stomach acid is liberated to degrade the food, it produces a lot of these protons (H +). The antacids who helps to neutralize this, most commonly used are, (OH-) and (CO3--).Acids generally, wher ar mixed in water, produce a lot of positive hydrogen protons, also knowed as protons (H+) are responsable for rise the pH.

Actually, pH are (power of hydrogen), it means the more positive hydrogens ions more acid will be that substance. So the antacids role, to neutralize this positive charges is add more negative ions to the solutios.

In the stomach, when the stomach acid are liberate to degradate the food, produces a lot of these protons (H+). The antacids who hepls to neutralize this, most commos used are, (OH-) and (CO3-- ).

This anions can be provide for substances like aluminum hydroxyde, magnesium hydroxyde, aluminium carbonate, and others..

These anions can be provided for substances like aluminum hydroxide, magnesium hydroxide, aluminum carbonate, and others.

The final temperature of the system is 32.4 °C.

heat lost by Pb + heat gained by water = 0

[tex]q_{1} +q_{2} = 0[/tex]

[tex]m_{1}C_{1}\Delta T_{1} + m_{2}C_{2}\Delta T_{2} = 0[/tex]

[tex]q_{1}= m_{1}C_{1}\Delta T_{1} = 21.2 \:\text{g}\times 0.128\: \text{J}^{\circ}\text{C}^{-1}\text{g}\times (T_{f} -113\: ^{\circ}\text{C}) = 2.713T_{f}\: \text{J}^{\circ}\text{C}^{-1}\: -\: 306.6\:\text{J}\cdot\text{g}^{-1}\\[/tex]

[tex]q_{2}= m_{2}C_{2}\Delta T_{2} = 14.8 \:\text{g}\times 4.184\: \text{J}\cdot^{\circ}\text{C}^{-1}\text{g}^{-1}\times (T_{f} -28.9\: ^{\circ}\text{C}) = 61.9\: \Delta T_{f} \: \text{J}^{\circ}\text{C} \:- 1790 \: \text{J}\\[/tex]

Adding [tex]q_{1}[/tex] and [tex]q_{2}[/tex] and combinibg like terms, we get

[tex]168.0\text{T}_{f}\: ^{\circ}\text{C} ^{-1}\:- 2096 = 0]\\[/tex]

[tex]T_{f} = \frac{2096}{68.0 \: ^{\circ}\text{C}^{-1}} = 32.4 ^{\circ}\text{C}\\[/tex]

Answer:

the more heat the more particle movement i dont think mass has any thing to do with it

Explanation:

Answer: ≈ 708 ( to 3 s.f.)

Working Out:

First we have to establish a balanced chemical equation that defines the reaction

       4 Al     +    3 O₂    →    2 Al₂O₃

Now, mole =  mass ÷ molar mass

∴ If the mass of Al in the reaction = 375 g

              then the # of moles of Al =  375 g  ÷  27 g/mol

                                                        =  13.889 mol

Also, the mole ratio between Al and Al₂O₃  is  2 : 1  (4 : 2).

As such if moles of Al = 13.889 mol

then #  of moles of Al₂O₃ =  13.889 mol ÷ 2

                                         = 6.944 mol

Since mass = mole × molar mass

Then mass of Al₂O₃ = 6.944 mol × ((27 × 2) + (16 × 3)) g/mol

                                 = 6.944 mol × 102  g/mol

                                 = 708.288 g

Final answer:

375 grams of Al will produce approximately 708 grams of Al₂O₃ when it reacts completely with oxygen, according to the balanced chemical equation 4Al + 3O₂ → 2Al₂O₃.

Explanation:

To find out how many grams of Al₂O₃ will be produced from 375 grams of Al reacting completely, we need to first write the balanced chemical equation involving aluminum and oxygen. The following is the balanced equation for the reaction between oxygen (O₂) and aluminum (Al):

4Al + 3O₂ → 2Al₂O₃.

Next, we need to calculate the molar mass of aluminum, which is approximately 26.98 g/mol. Using this, we can find the number of moles of Al by dividing the given mass by the molar mass:

Moles of Al = 375 g / 26.98 g/mol ≈ 13.90 mol of Al.

According to the balanced equation, 4 moles of Al produce 2 moles of Al₂O₃. Using this stoichiometric ratio, we can find how many moles of Al₂O₃ will be produced:

Moles of Al₂O₃ = (13.90 mol Al) × (2 mol Al₂O₃ / 4 mol Al) ≈ 6.95 mol of Al₂O₃.

Finally, we calculate the mass of Al₂O₃ by multiplying the moles by the molar mass of Al₂O₃ (which is approximately 101.96 g/mol):

Mass of Al₂O₃ = 6.95 mol × 101.96 g/mol ≈ 708 g.

Therefore, 708 grams of Al₂O₃ will be produced when 375 grams of Al react completely, rounded to three significant figures.

From the ideal gas equation,

[tex]PV = nRT[/tex]

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

The pressure and volume are inversely proportional to each other at constant temperature and number of moles.

Hence, on decreasing the pressure, the volume will increase.

As the hiker reaches a height of a mountain, the pressure would decrease which results in the reestablishment of equilibrium between gas molecules thus resulting in pushing of bag outwards.

Hence, the bag will expand as the hiker reaches the top of the mountain.

a gap in the rock layer due to erosion or from no rocks being deposited

geological processes taking place today are the same as those that occurred in the past.  

fossil that record the shape and structure of an organism

each layer is older than the layer above and younger than the layer below it.

the preserved remains or traces of a once living organism.

fossils that record the movement or behavior of an organism.

sediments spread in all directions until they thin out or hit a barrier.

sedimentary rocks are deposited horizontally.

age of rock compared to the ages of rock layers.

age of rocks calculated in years since formed.

words:

1.absolute age

2.body fossil

3.fossil

4.principle of lateral continuity

5.principle of original horizontally

6.principle of superposition

7.relative age  

8.trace fossil

9. unconformity

10.uniformitarianism

Answer is 9,10,2,6,3,8,4,5,7,1

All my answers were correct on this one

Each compound particle contains 1 atom of element A. However, not all atoms of element B are used, signifying that some are left over after the compounds are formed.

In this case, the question is looking at how atoms of element A and element B are combining to form 6 compounds. If we break down the numbers, 6 atoms of A combine with 8 atoms of B to create 6 compound particles. This means that for each compound, there must be 1 atom of element A (6 atoms of A / 6 compounds = 1 atom of A per compound) and roughly 1.33 atoms of element B (8 atoms B / 6 compounds = 1.33), but as we cannot have a fraction of an atom, this suggests that not all atoms of element B are used in the creation of these compounds, perhaps leaving some atoms of element B left over.

For a chemically correct scenario, all participating atoms are usually used up in the formation of compounds unless specified otherwise, illustrating the principle of matter conservation in chemical reactions.

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Each particle contains 1 atom of element A and 1 atom of element B. All 6 atoms of element A and 8 atoms of element B are used to form the compounds.

In this compound, 6 atoms of element A combine with 8 atoms of element B to form 6 compound particles. To determine the number of atoms in each particle, we divide the total number of atoms by the total number of particles. In this case, each particle contains 1 atom of element A and 1 atom of element B.

Not all atoms are used to form compounds. In this scenario, all 6 atoms of element A and all 8 atoms of element B are used to form the 6 compound particles.

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Alicia took half of her salary which is $42.15. So the total amount of her salary is $84..30.

Therefore, x-$42.15 ≥ $20.00

$84.30/x ≥$62.15

The amount of Alicia check is [tex]X[/tex].

Amount spent on dinner = [tex]\$42.15[/tex]  (given)

Amount brought to home = more than [tex]\$20.00[/tex]  (given)

The above information can be written in equation as:

[tex]X - \$42.5 > \$20.00[/tex]

Solving for [tex]X[/tex] as:

[tex]X > \$20.00 + \$42.15[/tex]

[tex]X > \$62.15[/tex]

Hence, inequality to represent the situation is [tex]X > \$62.15[/tex].

The problem is about calculating mass using the provided density and volume of an object or substance. In physics, mass is determined by multiplying density by volume, resulting in a mass of 70g in this instance.

The subject of this question is tied to the concept of density, a physical property of matter. In physics, we calculate density by dividing mass by volume.

Here, the density is given as 7g/ml, and the volume is stated as 10ml. Using the provided values, you could rearrange the density formula to find the mass.

Mass is calculated by multiplying density by volume, resulting in a mass of 70g.

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