What causes solid to change to a liquid?

Answer:

Abundance 18O = 0.201%

Abundance 16O = 99.768%

Explanation:

The average atomic weight of oxygen is defined as:

Average = Abundance 16O * 15.995amu + Abundance 17O * 16.999amu + Abundance 18O * 17.999amu

As average is 15.9994 amu and abundance of O17 = 0.037% = 3.7x10⁻⁴ we can write:

15.9994amu = Abundance 16O * 15.995amu + 3.7x10⁻⁴* 16.999amu + Abundance 18O * 17.999amu

15.9931 = Abundance 16O * 15.995amu + Abundance 18O * 17.999amu (1)

The abundance of each isotope = 1:

1 = Abundance 16O + Abundance 17O + Abundance 18O

1 = Abundance 16O + 3.7x10⁻⁴ + Abundance 18O

0.99963 = Abundance 16O + Abundance 18O (2)

Replacing (2) in (1):

15.9931 = (0.99963 - Abundance 18O) * 15.995amu + Abundance 18O * 17.999amu

15.9931 = 15.9891 - 15.995Abundance 18O + 17.999Abundance 18O

15.9931 = 15.9891 - 15.995Abundance 18O + 17.999Abundance 18O

4.0182x10⁻³ = 2.004Abundance 18O

2.005x10⁻³ = Abundance 18O = 0.201%

Thus, abundance of 16O in percentage is:

Abundance 16O = 100 - 0.201% - 0.031%

Answer:

5.80

Explanation:

The coefficient of Fe would be 2, the coefficient of Cl2 would be 3, while the coefficient of FeCl2 would be 2.  

The balanced equation of the reaction would be as follows:

\(2Fe(S) + 3Cl_2 ---> 2FeCl_3(S)\)

Thus, the coefficients of Fe, Cl2, and FeCl3 respectively would be 2, 3, and 2.

In other words, 2 moles of Fe require 3 moles of Cl2 to produce 2 moles of FeCl3 in a complete reaction.

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There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

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Answer:

Because it's a system in the solar areas.

Explanation:

Im just tryna sound smart, I actually have no clue

Answer:

The Latin word for the Sun is Sol, so we call this system the Solar System. He showed that it was very likely that all the planets moved around the Sun. This time even more people thought Galileo may be right and that the Earth really did move around the Sun.

Explanation:

There are many planetary systems like ours in the universe, with planets orbiting a host star. Our planetary system is named the "solar" system because our Sun is named Sol, after the Latin word for Sun, "solis," and anything related to the Sun we call solar.

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Answer:

a change in the level of consumer income

Explanation:

1. The number of mole in 0.293 Kg of Pb is 1.42 mole

2. The number of atom in 0.293 Kg of Pb is 8.55×10²³ atoms

1. How to determine the number of mole

The numbe of mole in the 0.293 Kg of Pb can be obtained as follow:

Mole = mass / molar mass

Number of mole of = 293 / 207

Number of mole = 1.42 mole

Thus, the number of mole is 1.42 mole

2. How to determine the number of atoms

The number of atoms can be obtained as follow:

From Avogadro's hypothesis,

1 mole of Pb = 6.02×10²³ atoms

Therefore,

1.42 mole of Pb = (1.42 mole × 6.02×10²³ atoms) / 1 mole

1.42 mole of Pb = 8.55×10²³ atoms

Thus, the number of atoms is 8.55×10²³ atoms

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Answer:

The new volume is 5.0L

Explanation:

Given:

Initial pressure (P₁) = 1.4 atm

Initial volume (V₁) = 2.3 L

Final pressure (P₂) = 0.65 atm

We'll use Boyle's Law:

P₁V₁ = P₂V₂

Substituting the given values:

(1.4 atm)(2.3 L) = (0.65 atm)(V₂)

Now, let's solve for V₂:

V₂ = (1.4 atm * 2.3 L) / 0.65 atm

Calculating this expression step-by-step:

V₂ = (3.22 atm·L) / 0.65 atm

V₂ ≈ 4.953 L

Rounded to one decimal place, the new volume is approximately 5.0 L.

Answer:

D.) The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.

Answer

The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.

The best order for using PolynomialFeatures, LogisticRegression, and StandardScaler depends on the specific task and the nature of the data.

However, a general guideline would be to apply StandardScaler first, then PolynomialFeatures, and finally LogisticRegression. StandardScaler is typically applied as a preprocessing step to standardize the features by subtracting the mean and scaling to unit variance. This is important when working with features that have different scales or units, as it helps in achieving better model performance and prevents certain features from dominating the learning process. By applying StandardScaler first, we ensure that the data is appropriately scaled before further transformations.

After scaling the data, PolynomialFeatures can be applied to create additional polynomial features. This technique is useful when the relationship between the features and the target variable is nonlinear. By introducing higher-degree polynomial terms, PolynomialFeatures can capture complex interactions and nonlinear patterns in the data. It expands the feature space by creating combinations of features, allowing the model to learn more sophisticated relationships. Finally, LogisticRegression can be used for classification tasks. Logistic regression is a linear model that predicts the probability of a binary outcome. It works well when the relationship between the features and the target variable is approximately linear. By using the transformed features from PolynomialFeatures, LogisticRegression can capture nonlinear relationships in the data, enhancing the model's performance.

It's important to note that the best order may vary depending on the specific dataset and the complexity of the problem at hand. It's recommended to experiment with different orders and evaluate the model's performance using appropriate evaluation metrics to determine the optimal order for a given task.

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Answer:

1)  km  2)  cm^  3)  no units (kg cancels) 4) g/cm^3  5)  g  6)  g°C

Explanation:

Like units will cancel ((m/km)*(km) = m

Non-cancelled units remain (ml)*(g/ml)*(°C) = g°C

Answer:Stable nuclei with atomic numbers up to about 20 have an neutron:proton ratio of about 1:1 (solid line). Figure 1: permission from Wikipedia. The deviation from the N:Z=1 line on the belt of stability originates from a non-unity N:Z ratio necessary for total stability of nuclei

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Answer:

Since 1982, STP is defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 105 Pa (100 kPa, 1 bar).

Explanation:

I hope I helped

Boiling point refers to the temperature at which a liquid turns into vapor, so the greater the boiling point, the more heat is required to turn the substance into a gas.

Here are the five substances in order of increasing boiling point:

1. Methane (CH4) - This is a colorless and odorless gas that is used as a fuel. Its boiling point is -161.6 degrees Celsius.

2. Ethanol (C2H5OH) - This is a colorless, volatile, and flammable liquid that is used as a solvent and fuel. Its boiling point is 78.4 degrees Celsius.

3. Water (H2O) - This is a transparent, odorless, tasteless liquid that is used in many applications, including agriculture, industry, and food preparation. Its boiling point is 100 degrees Celsius.

4. Propylene glycol (C3H8O2) - This is a colorless and odorless liquid that is used as a solvent and antifreeze. Its boiling point is 188.2 degrees Celsius.

5. Glycerin (C3H8O3) - This is a sweet-tasting, colorless, and odorless liquid that is used in many applications, including food, pharmaceuticals, and cosmetics. Its boiling point is 290 degrees Celsius.

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We first verify that the equation is balanced. We have 5 carbons (C), 2 sulfurs (S), and 4 oxygens (O) on each side of the reaction. So the reaction is balanced.

a) Now if we look at the reaction we can see that when 2 moles of SO2 react, 1 mole of CS2 is produced. That is, the ratio is 2 to 1. For each mole of SO2 half as many moles of CS2 will be produced.

So if we have 9.5 moles of SO2 we will have 9.5/2 moles, that is 4.75 moles of CS2.

Answer a) By reacting 9.50 moles of SO2 with an excess of it would be produced 4.75 moles of CS2.

Now, for the following parts of the question, we can apply the ideal gas law. This is because the reaction is in the gas phase and the law applies only to gases.

Where,

P= Pressure at STP = 1 atm

T= Temperature at STP = 273.15K

R= Ideal law constant = 0.08206 (atm L)/(mol K)

V= Volume of the gas

n= Numer of moles

b)We clear n and we replace the known values of SO2 to find the number of moles of SO2 that react.

Now, for each mole of SO2 that reacts we need 5/2 moles of C, that is 0.24x5/2=0.61 moles of C.

We use mass molar of C to calculate the grams.

Mass molar of C=12.01g/mol

Mass of C= Moles of C x Mass Molar

Mass of C= 0.61 mol x 12.01 g/mol = 7.37 g

So, To fully react 5.5 L of SO2 at STP we will need 7.37 g of C.

c)We apply the gas law again but this time we clear the volume.

We also take into account that for each mole of C, 4 moles of CO are produced, so if we have 20 moles of C we will produce 20x4=80 moles of CO.

So, from 20.0 moles of C at STP can be produced 1793.18 liters of CO

The correct short-hand notation for the cell that will be studied in this experiment depends on the specific experimental setup and the desired electrochemical reaction. In the first given notation, Mg is the anode and Hg2+ is the cathode.

In the second given notation, Mg is still the anode but Cu2+ is the cathode. In the third given notation, Cu is the anode and Mg2+ is the cathode. In the fourth given notation, Hg is the anode and Mg2+ is the cathode. To determine the correct notation, specific experimental conditions must be considered, including the type and concentration of electrolyte solutions, temperature, and the desired direction of electron flow. It is important to note that the short-hand notation is a simplified representation of the electrochemical cell and may not capture all aspects of the reaction. In general, the short-hand notation is written with the anode on the left and the cathode on the right, separated by double vertical bars indicating a salt bridge or other ion-permeable barrier. The electrode materials and their respective ions are written as half-reactions with the anode on the left and the cathode on the right, separated by single vertical bars.

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Answer:

Explanation:

negative charge makes it and anion.  Ne,

A polyatomic ion, often called a molecular ion, is a set of covalently bound atoms or a metal complex that can be thought of as acting as a single unit and has a net charge that is not zero.

Chlorate. ClO₃⁻,Hydroxide. OH⁻,Carbonate. CO₃⁻²,Sulfate. SO₄⁻²,Phosphate. PO₄⁻³,Ammonium. NH₄⁺

Similar to how ions are created when neutral atoms acquire or lose electrons, polyatomic ions are created when neutral molecules gain or lose electrons. Because the total number of electrons in the molecule is more than the total number of protons in the molecule, a polyatomic ion is a collection of covalently bound atoms with a net charge. A polyatomic ion's net charge must be equal to the formal charges added to each of its atoms in the Lewis dot structure.

A molecule that has been ionised by gaining or losing electrons is referred to as a polyatomic ion. The group of atoms that are covalently linked together to form a polyatomic ion has a net charge because the total amount of electrons and protons in the molecule is not equal. When depicting Lewis dot structures, the total charge on a polyatomic ion is equal to the sum of the formal charges on each of the atoms in the ion.

List of Common Polyatomic Ions

[AsO3]3-Arsenate

[BO3]3-Borate

[PO3]3-Phosphite

[PO4]3-Phosphate

[SiO3]2-Silicate

[SO4]2-Sulfate

[SO3]2-Sulfite

[S2O3]2-Thiosulfate

[H2PO4]–Dihydrogen phosphate-

[OH]–Hydroxide

[HSO4]–Hydrogen sulphate

[NO3]–Nitrate

[NO2]–Nitrite

[ClO4]–Perchlorate

[MnO4]–Permanganate

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Answer:

6.875 moles of Carbon Dioxide

Explanation:

110 grams CH4 / 16 molar mass = 6.875 moles

To plate out 7.10 g of chromium, this current will have to be applied for 2.21 hours.

Electroplating is a process in which a metal ion present in a solution is deposited on an electrode by the use of an electric current. The metal ion's positive charge is neutralized as it accepts electrons from the negatively charged cathode (the electrode to be plated). The anode (the electrode with the metal to be deposited) oxidizes and dissolves into the electrolyte solution, providing metal ions to replenish those deposited on the cathode.

The formula to calculate the time is given as;

Time = (Weight of metal)/(Current × 96500 × electrochemical equivalent weight).

Weight of chromium, w = 6.50 g

Current, I = 5.85 A

Electrochemical equivalent weight, E = 0.52

The formula to calculate the time is given as;

Time = (Weight of metal)/(Current × 96500 × electrochemical equivalent weight)Substituting the values;

Time = 6.50/(5.85 × 96500 × 0.52)Time = 2.21 hours.

Therefore, to plate out 6.50 g of chromium, this current will have to be applied for 2.21 hours.

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Using the law of the conservation of mass, the reactions can be shown to obey the law.

We need to know what the law of the conservation of mass says so that we can be able to know how we can be able to apply the law in the proper perspective. We have to know that the law says that total mass of the system would remain constant. The implication of this is that the mass before the reaction would be the same as the mass after the reaction. The mass of the substance must be able to add up in the system that is under study as we have one here.

Mass of the iron = 56 g

Mass of the chlorine = 35.5 g

Balanced reaction equation;

\(2Fe + 3Cl_{2} ---- > 2FeCl_{3}\)

This is the  formation of the iron III chloride

Total mass on the right hand side = 2(56) + 6(35.5) = 325 g

Total mass on the left hand side = 2[56 + 3(35.5)] = 325 g

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Answer:

cement air water sand and gravel

Explanation:

Answer:

Explanation:

The principal ingredients that make up the concrete mix are: cement, fine aggregate, coarse aggregate, water, chemical admixtures, and mineral admixtures.

Answer:

there are 37 atoms

Explanation:

The formula for nickel(II) acetate tetrahydrate is Ni(C2H3O2)4. To calculate the number of atoms in the formula, we need to count the number of atoms of each element and then multiply each by the number of times it appears in the formula.

Ni: There is 1 Ni atom in the formula.

C: There are 8 C atoms (4 from each C2H3O2) in the formula.

H: There are 12 H atoms (3 from each C2H3O2) in the formula.

O: There are 16 O atoms (4 from each C2H3O2) in the formula.

Therefore, the total number of atoms in the formula is 1 + 8 + 12 + 16 = 37.

So there are 37 atoms in Ni(C2H3O2)4.

Given :

Oxygen gas (\(O_2\)) that are needed to react with 0.725 moles of aluminum (Al).

\(4Al(s)+3O_2(g)->2Al_2O_3(s)\)

Solution :

4 moles of Aluminium react with 3 moles of oxygen,

Let, moles of oxygen react with 0.725 moles of Al is x.

\(x=\dfrac{0.725\times 3}{4}\\\\x=0.54375\ moles\)

Hence, this is the required solution.

The number of moles that should be required to react is 0.54375 moles.

Since There are 0.725 moles of aluminum (Al)

And, there is the chemical equation 4Al (s) + 3O2 (g) ⟶ 2Al2O3 (s)

The above equation represent 4 moles of Aluminium should be react with 3 moles of oxygen.

So, the number of moles should be

= 0.725 * 3/4

= 0.54375 moles

Therefore, The number of moles that should be required to react is 0.54375 moles.

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The oxides of Cr(VI) and Mn(VII) are commonly used as oxidizing agents in organic synthesis.

An oxidizing agent is a substance that gains or accepts or receives" an electron from a reducing agent in a redox chemical reaction.

In other words, an oxidizer is any substance that oxidizes another substance.

Fluorine (F) is the most powerful oxidizing agent of all elements, and the other Halogens are also effective oxidizers.

Thus, in organic synthesis, the oxides of Cr(VI) and Mn(VII) are commonly used as oxidizing agents.

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Answer:

it is because of Dark Matter

Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).

Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.

Explanation:

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A group of scientists is studying observable matter in a cluster of galaxies. The duster remains intact due to the gravitational pull.

A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bonded together.

Dark matter is a component of the universe whose gravitational pull can be detected rather than its luminosity. The universe's matter-energy ratio is made up of 30.1 percent dark matter, 69.4 percent dark energy, and “regular” visible matter (0.5 percent).

Since dark matter is made up of particles that do not absorb, reflect, or emit light, it is impossible to identify it through electromagnetic radiation observation. Dark matter is a substance that cannot be directly observed.

Therefore, a team of researchers is examining the material that can be seen in a clump of galaxies. Due to the gravitational force, the duster is unharmed.

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The branch of chemistry is Stoichiometry

Chemistry's study of numerical relationships in chemical reactions is known as stoichiometry. The Law of Conservation of Mass serves as its foundation. Although the elements that reactants and products are associated with change frequently during a reaction, all chemical reactions contain the same elements as reactants and products.

Any chemical equation must be balanced, and this is done by comparing the number of atoms utilized as reactants and products. In essence, it denotes how the reactant and product are related. There is no qualitative analysis involved; merely a quantitative one. n To determine the amount of moles used in the reactant and product of the particles, stoichiometry is the study of chemical reactions.

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Two ways that stress could negatively impact a students performance is by causing them to procrastinate. When you're stressed, you tend to keep putting things off because you "just can't deal with it" at the moment. This could cause the student to turn in their assignments late (or not at all) and cause their grades to drop. Additionally, when you're stressed, it's harder to fall asleep, and once you are, you don't sleep as well. Sleep deprivation can greatly affect a student's in class performance by causing them to fall asleep in class, or not pay attention as well.