A 32.60 g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 51.00 mL . The solid and toluene together weigh 58.86 g . The density of toluene at the temperature of the experiment is 0.864 g/mL. What is the density of the solid?

A chemical equation must balance according to the rule of conservation of mass. According to the rule, mass cannot be generated or removed during a chemical process. Here add a coefficient of 2 in front of Na. The correct option is C.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and charge are both equal.

Coefficients are the figures or expressions put in front of a chemical symbol or formula to balance chemical equations. It provides information on the number of atoms or molecules of the drug or chemical that are a part of the reaction.

The balanced equation is:

2Na + Cl₂ → 2 NaCl

Thus the correct option is C.

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Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

The groups in the atomic table have to do with the number of the valence electrons that can be found in a given element. The period of the table has to do with the number of electron shells that are contained in an element.

The term periodic table is the term that is used to describe the tabular display of the chemical elements that are used in the sciences especially in the fields of chemistry, biology and in physics.

The groups that are in the table can be defined as rge number of the valence electrons that are contained in a given element.

The periods of the table can be defined as the horizontal row in the periodic element that tells us the number of electron shells that they are known to carry.

Hence we can say that The groups in the atomic table have to do with the number of the valence electrons that can be found in a given element. The period of the table has to do with the number of electron shells that are contained in an element.

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Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

Answer:

They are called coefficients.

Answer:

D. The temperature remains at 0°C until the change of state is complete.

Answer:

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Explanation:

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The number that is given as digits is established using significant figures. A meaningful representation of numbers is carried by these digits. Frequently, significant digits are employed in place of figures.

Thus, By counting all of the values beginning with the first non-zero digit on the left, we may determine the number of significant digits.

The crucial or important digits that accurately represent the meaning of a certain number are known as the significant figures of that number.

6.658, for instance, has four significant digits. These huge amounts give the numbers accuracy. Additionally, they are known as significant digits.

Thus, The number that is given as digits is established using significant figures. A meaningful representation of numbers is carried by these digits. Frequently, significant digits are employed in place of figures.

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The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of buffer is 10.5. pH is a unitless quantity.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

CH\(_3\)NH\(_2\) + H\(_2\)O(aq) \(\rightarrow\) CH\(_3\)NH\(_3\) ⁺(aq) + OH⁻(aq)

Kb = [CH\(_3\)NH\(_3\) ⁺] x[OH⁻] =3.7x 10⁻⁴

[CH\(_3\)NH\(_2\)]= 0.2 / 1.00 =0.2M

Kb = (0.2M) x [OH⁻] = 3.7x 10⁻⁴

[OH-] = 3.15 x 10⁻⁴

pOH=-log[OH-]

      = -log[3.15 x 10⁻⁴]

pOH=3.5

pH+pOH=14

pH = 10.5

Therefore, the pH of buffer is 10.5.

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\(\text{Given that,}\\ \\\text{Volume,}~V= 57 mL = 0.057 L\\\\\text{Molar concentration,}~ S = 0.17 ~mol/L\\\\\text{Number of moles,} ~ n=?\\\\S = \dfrac{n}{V} \\\\\implies n = SV = 0.17\times 0.057 =0.00969 ~mol ~ HCl\)

Answer:

Global warming

Explanation:

Global warming occours when there is an increase in temprature, so before the temprature was colder now it is a bit hotter.

To draw a Bohr Rutherford diagram for carbon-12, we would have the symbol C in the center, with 2 electrons in the first energy level and 4 electrons in the second energy level, arranged in pairs. Each energy level would be represented by a circle around the nucleus, with the appropriate number of electrons placed in the circles.

A Bohr Rutherford diagram is a visual representation of the electron arrangement in an atom. Carbon-12 has 6 protons and 6 neutrons, which means it has 6 electrons as well since it is a neutral atom. In a Bohr Rutherford diagram, the nucleus is represented by the symbol for the element and the protons and neutrons are shown as small circles inside the symbol. The electrons are represented as dots or circles around the symbol, in the order of increasing energy levels.

In the case of carbon-12, the first energy level can hold a maximum of 2 electrons, and the second energy level can hold a maximum of 8 electrons. Therefore, the first energy level will have 2 electrons, and the remaining 4 electrons will go in the second energy level.

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The diagram representing the ionized state of matter is the plasma state.

2Diagrams of four states of matter

Solid: A solid is a state of matter in which the constituent particles, such as atoms, molecules, or ions, are packed together tightly and firmly held by strong intermolecular forces.

Liquid: A liquid is a state of matter in which the constituent particles, such as atoms, molecules, or ions, are closely packed together but are not held together as strongly as in solids.

Gas: A gas is a state of matter in which the constituent particles, such as atoms, molecules, or ions, are widely separated and are not held together as strongly as in liquids and solids.

Plasma: Plasma is a state of matter in which a gas has been ionized, and it becomes a collection of charged particles such as positive ions and free electrons.

Plasma is a type of ionized gas in which the gas is composed of ions, electrons, and neutral atoms.

Plasma is a state of matter that is similar to a gas in that it has no fixed shape or volume, but unlike gas, it is made up of electrically charged particles.

The electrical charges in plasma are due to the presence of both positive and negative ions.

The most common example of plasma is lightning, and it is also present in fluorescent lights, neon signs, and plasma TVs.

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Answer:

Ask a question based on an observation

Explanation:

hope this helps :)

Explanation:

Not only did outermost electron determine the valence electron, but also periodic table. whatever group they fall into in periodic table each valence electrons present in a particular atom e.g K and Ca belong to group 1 and 2 respectively and k has 1 and Ca have 2 in each outermost electron

Explanation:

aluminium

proton= 13

electron=13

neutron=27

nitrogen

proton= 7

electron=7

neutron= 14

The features of all the resonance forms of a molecule or ion have in common is atoms present, number of electrons, net charge on the molecules or ion and arrangement of atoms.

Resonance is defined as a phenomenon that occurs when the matching vibrations of another object increases the amplitude of an objects oscillation.

There are basically five types of resonance

Resonance is most important because it provide much more realistic view of the shape of a molecule.

Thus, the features of all the resonance forms of a molecule or ion have in common is atoms present, number of electrons, net charge on the molecules or ion and arrangement of atoms.

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The mass of an atom of element Z is 4 amu. This can be determined by subtracting the mass of an atom of carbon (12 amu) and an atom of oxygen (16 amu) from double the mass of an atom of oxygen (32 amu). 32 amu - 12 amu - 16 amu = 4 amu.

An atom of carbon is a basic building block of all organic materials. It is the 6th element in the periodic table and has an atomic number of 6. Carbon atoms have 6 protons and 6 neutrons, and have a valence of 4. This means that carbon atoms can form four bonds with other atoms. Carbon is the basis of all life on Earth, as it is essential for the formation of proteins, fatty acids, and other molecules necessary for life. Carbon atoms have the ability to form a wide variety of molecules with different properties, which makes them highly versatile and important in many different fields, such as medicine and engineering. Carbon is a non-metal, but can behave like a metal in certain circumstances. It is also the basis of the fossil fuels that power our society.

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In terms of oxidation number, oxidation can be defined as the chemical change in which there occurs an increase in the oxidation number of an atom. Reduction may be defined as a chemical change in which there occurs a decrease in the oxidation number of an atom. The correct option is D.

An oxidizing agent is a substance which suffers a decrease in the oxidation number of one or more of its elements and a reducing agent is a substance which suffers an increase in the oxidation number of one or more of its elements.

In the reaction, oxidation state of 'Ca' increases from 0 to +2, so calcium is oxidized and acts as a reducing agent.

Thus the correct option is D.

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Answer:

A

Explanation:

I had the exact same question on my test and I got it right

Answer:

A full.

Explanation:

An electron needs to have a full octet do not need any more electrons. So the correct option is D.

The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are little subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.

The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.

However, not every electron belongs to an atom. A chemical bond or molecule can only be created by the electrons that are found in the outermost shell. Valence electrons are the name given to this sort of electron.

Therefore the correct option is D.

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Some tips to follow when doing lab practical are:

From the table, Column 1 represents the time in half-life cycles, ranging from the initial state to 8 cycles. Column 2 shows the predicted number of radioactive atoms at each time point, based on the assumption that the number of atoms reduces by half in each half-life cycle.

Column 3 represents the simulated number of radioactive atoms at each time point and corresponds to the predicted values of the simulation.

In conclusion, the results as outlined in the lab guide are A=  27 B=  16 C=  9 D=  4 E=  2 F=  2 G=  0 H= 0.

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#complete question:

Do step 3 as outlined in the lab guide. Record your results in the appropriate blanks. A = B = C = D = E = F = G = H = A 3-column table with 9 rows. Column 1 is labeled Time half-life cycles, n with entries Initial, 1, 2, 3, 4, 5, 6, 7, 8. Column 2 is labeled Predicted radioactive atoms with entries 100, 50, 25, 13, 6, 3, 2, 1, 0. Column 3 is labeled Simulated radioactive atoms with entries 100, A, B, C, D, E, F, G, H.

For a student wishing to contribute to the preservation of coral reefs, oceanography would be the most beneficial topic of study because it is ocean-focused.

An underwater environment known as a coral reef is characterized by corals that construct reefs. Coral polyp colonies are bound together by calcium carbonate to build reefs. Stony corals, whose polyps gather together, make up the majority of coral reefs.

Coral reefs offer chances for recreation, serve as a barrier against erosion and storm damage, and support local economies. They are also a source of fresh medications and food. More than 500 million people rely on reefs for safety, income, and food.

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a) the equilibrium concentrations of A, B, and C are:

[A] = 0.30 M - 0.054 M = 0.246 M

[B] = 0.40 M - 0.054 M = 0.346 M

[C] = 0.054 M

The standard free-energy change (ΔG°) is related to the equilibrium constant (K) through the following equation:

ΔG° = -RT ln K

where R is the gas constant (8.314 J/mol•K) and T is the temperature in kelvin.

To determine the equilibrium concentrations of A, B, and C, we need to use the equilibrium constant expression:

K = [C]/([A][B])

At equilibrium, the concentrations of A and B will decrease and the concentration of C will increase until the equilibrium constant is reached. Let x be the change in concentration of A, B, and C at equilibrium. Then, the equilibrium concentrations can be expressed as:

[A] = 0.30 M - x

[B] = 0.40 M - x

[C] = x

Substituting these expressions into the equilibrium constant expression, we get:

K = x/[(0.30 - x)(0.40 - x)]

At equilibrium, K is equal to e^(-ΔG°/RT), which is:

K = e^(3.56 kJ/mol / (8.314 J/mol•K * 298 K))

= 1.77

Setting the two expressions for K equal to each other and solving for x, we get:

x/[(0.30 - x)(0.40 - x)] = 1.77

x = 0.054 M

Therefore, the equilibrium concentrations of A, B, and C are:

[A] = 0.30 M - 0.054 M = 0.246 M

[B] = 0.40 M - 0.054 M = 0.346 M

[C] = 0.054 M

b) There would be no equilibrium concentrations of A, B, and C that could be calculated "There would be no change to the answers," is not correct.

If the reaction had a standard free-energy change of +3.56 kJ/mol, then the sign of ΔG° would be positive. This means that the reaction would be non-spontaneous and would not proceed in the forward direction. Therefore, there would be no equilibrium concentrations of A, B, and C that could be calculated. "There would be no change to the answers," is not correct.

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Answer:

(a) 157.7 g

(b) 7.04 g/dm³

Explanation:

(a) From the question,

According to Avogadro's Law,

1 mole of every gas at STP occupies a volume of 22.4 dm³

But mass of 1 mole of the diatomic gas  = molar mass of the gas.

This Implies that,

The molar mass of the gas at STP occupies a volume of 22.4 dm³

From the question,

If,

0.25 L bottle contain 1.76 g of the gas,

Therefore,

Molar mass of the gas = (1.76×22.4)/0.25

Molar mass of the gas = 157.7 g.

(b) Density of the gas = mass/volume

D = m/v

Given: m = 1.76 g, v = 0.25 L = 0.25 dm³

Therefore,

D = 1.76/0,25

D = 7.04 g/dm³

Answer:

Explanation:

glycerin

Answer: Absolute dating is used to determine a precise age of a rock or fossil through radiometric dating methods. This uses radioactive minerals that occur in rocks and fossils almost like a geological clock. ... These isotopes break down at a constant rate over time through radioactive decay.

Answer:

Because of the difficulties of measuring the atmosphere's properties above the earth's reachable surface

Explanation:

Hello,

In this case, meteorology is the branch of science studying the atmosphere in its weather processes and forecasting and it had a late development because of the difficulties of measuring the atmosphere's properties above the earth's reachable surface. We cannot forget that even nowadays, it is very difficult to predict upcoming weathers with the 100 % assurance and with many days in advance.

Best regards.

Meteorology is developed lately as compared to other branches of science due to far away from the reach of humans.

Meteorology is a late developer compared to other branches of science because the measuring the climatic conditions in the atmosphere is difficult and even impossible without the presence of advance technologies.

To find out the weather as well as climatic conditions can't be measured due to it is not reachable to the human like other materials present on the earth surface so we can conclude that meteorology is developed lately as compared to other branches of science due to far away from the reach of humans.

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The correct steps needed are to multiply the first equation, multiply the second equation, add the two equations obtained, subtract the equation obtained in step 3 from that in step one, simplification of the equation obtained in step 4, and use the given equation to substitute C2H2(g) in the equation obtained in step 5.

The final reaction can be achieved by combining the two contributing equations as follows:

Multiply the first equation by 2 to obtain:2C₂H₂(g) + 5O₂(g) ---> 4CO₂(g) + 2H₂O(ℓ) ΔH° = −2599 kJ

Multiply the second equation by 2 and the third equation by 1 to obtain:2C(s) + 2O₂(g) --->

2CO₂(g) ΔH° = −787 kJH₂(g) + 1O₂(g) ---> H₂O(ℓ) ΔH° = −285.8 kJ

Add the two equations obtained in step 2 to obtain:2C(s) + 2H₂(g) + 3O₂(g) ---> 2CO₂(g) + 2H₂O(ℓ) ΔH° = −1072.8 kJ

Subtract the equation obtained in step 3 from the equation obtained in step 1 to eliminate the O₂ term:2C₂H₂(g) - 2C(s) - 2H₂(g) ---> 4CO₂(g) + 2H₂O(ℓ) - 2CO₂(g) - 2H₂O(ℓ) ΔH° = −1526.2 kJ

Simplify the equation obtained in step 4 by canceling out the H₂O terms: 2C₂H₂(g) - 2C(s) - 2H₂(g) ---> 2CO₂(g) ΔH° = −1526.2 kJ

Finally, use the given equation to substitute C₂H₂(g) in the equation obtained in step 5:

2C(s) + H₂(g) + 5/2O₂(g) ---> 2CO₂(g) + H₂O(ℓ) ΔH° = −1299.5 kJ

By adding this equation to the equation obtained in step 5, we get:4C(s) + 2H₂(g) + 5O₂(g) ---> 4CO₂(g) + 2H₂O(ℓ) ΔH° = −2825.7 kJ

Therefore, the correct steps needed to achieve the final reaction are:

2C(s) + H₂(g) + 5/2O₂(g) --->

2CO(g) + H₂O(ℓ) ΔH° = −1299.5 kJ

2C₂H₂(g) + 5O₂(g) --->

4CO₂(g) + 2H₂O(ℓ) ΔH° = −2599 kJ

4C(s) + 2H₂(g) + 5O₂(g) --->

4CO₂(g) + 2H₂O(ℓ) ΔH° = −2825.7 kJ.

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