Which isotope in each pair is more stable? Why?(b) ⁷⁹₃₅Br or ⁷⁸₃₅Br

Therefore, 9.49 grams of water is expected in the given 3.21 g sample of CuSO4 • 10H2O.

To determine the number of water molecules in the given hydrate, CuSO4 • 10H2O, we'll need to find out the molar mass of the compound and the molar mass of water to make a comparison.

The molar mass of CuSO4 • 10H2O is calculated as:

CuSO4 → 159.6 g/mol10H2O → 180.16 g/mol (18.016 g/mol × 10)CuSO4 • 10H2O → 159.6 g/mol + 180.16 g/mol

= 339.76 g/mol (rounded to three significant figures)

Thus, we can see that the molar mass of CuSO4 • 10H2O is 339.76 g/mol.

We know that this hydrate consists of ten molecules of water, each having a molar mass of 18.016 g/mol (which is the same as the molar mass of water), and one molecule of CuSO4 with a molar mass of 159.6 g/mol.

Therefore, the number of moles of water in the sample is:

(10 × 18.016 g/mol) ÷ 339.76 g/mol = 0.527 moles

So, the mass of water is equal to its molar mass multiplied by the number of moles.

The mass of water is:

0.527 mol × 18.016 g/mol = 9.49 g

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The balance chemical equations is KCIO3 ==========> KCI + 30₂ .

A chemical equation shows the beginning compound, the reactants on the left, and the final compound, the product on the right, separated via an arrow. In a balanced chemical equation, the numbers of atoms of each detail and the entire charge are identical on both sides of the equation.

A chemical equation is the symbolic illustration of a chemical reaction in the form of symbols and formulae, in which the reactant entities are given on the left-hand side and the product entities at the proper-hand aspect with a plus sign among the entities in each of the reactants and the products and an arrow that points closer to the products.

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When 0.600 g of lead (II) nitrate reacts with 0.850 g of potassium iodide, a double displacement reaction occurs.

The reaction between 0.600 g of lead (II) nitrate and 0.850 g of potassium iodide produces lead iodide and potassium nitrate. The balanced chemical equation for the reaction is:

Pb(NO\(_{3}\))\(^{2}\) + 2KI → PbI\(^{2}\) + 2KNO\(_{3}\)

Based on the stoichiometry of the reaction, we can calculate the theoretical yield of lead iodide. The molar mass of PbI\(^{2}\) is 461.01 g/mol, so the amount of PbI\(^{2}\) produced should be:

0.600 g Pb(NO\(_{3}\))\(^{2}\) x (1 mol Pb(NO\(_{3}\))\(^{2}\) / 331.2 g Pb(NO\(_{3}\))\(^{2}\)) x (1 mol PbI\(^{2}\) / 1 mol Pb(NO\(_{3}\))\(^{2}\)) x (461.01 g PbI\(^{2}\) / 1 mol PbI\(^{2}\)) = 0.818 g PbI\(^{2}\)

Since lead iodide is a yellow precipitate, we can confirm the formation of the product by observing a color change in the reaction mixture. However, the actual yield of the reaction may be less than the theoretical yield due to factors such as incomplete reactions or loss of product during handling.

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Answer:

I'm pretty sure it is the patriarch

Explanation

Patriarch means the head of a family or tribe.

Answer:

D

Explanation:

When this new mixture is then filtered, the salt in the salty water solution passes through the filter paper to form the filtrate and the sand remains as the residue.

The process of mixtures

A mixture is composed of two or more types of matter that can be present in varying amounts and can be physically separated by using methods that use physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

When water mixes with carbon dioxide, a substance called carbonic acid is formed. Carbonic acid is a weak acid that plays an important role in the carbon cycle. The carbon cycle is the process through which carbon moves from the atmosphere, to plants, then to animals, to the soil, and and back into the atmosphere.

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Molecular formula of Acetic acid is CH3-COOH.

It's empirical formula is C2H4O2

You should develop the TLC (thin layer chromatography) plate orthogonally (under a 90-degree angle) to the original direction of development (along its width, while the original development was along the length of the TLC plate).

This technique is called 2D TLC (two-dimensional thin layer chromatography) and is usually employed to analyze and preparatively separate very complex mixtures that cannot be separated using only one solvent system. The initial development (along the length of the TLC plate) enables crude separation into groups of compounds with similar retention factor (Rf). These groups can then be further separated using a different solvent system by developing the same TLC plate along its width.

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Answer:

Decomposition

Explanation:

One reactant has formed two products

Answer:

D.Metallic

Explanation:

The metallic model is often characterized as a "sea of electrons". This is because the electrons delocalize from the ion's orbitals, allowing them to roam freely around the substance. This is what the model is showing.

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According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.

To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.

In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.

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Answer:

Pacific Ocean

Explanation:

Answer:

air is a solution because it is homogeneous, uniform throughout,and doesn't scatter light

Answer:

Over a vast amount of time, millions of years, the earth gradually cooled. When the temperature dropped enough, water vapor condensed and went from a gas to liquid form. This created clouds. From these clouds, the oceans formed and the oceans absorbed a lot of the carbon dioxide in the atmosphere.

Explanation:

Answer:

Personality tests are often used to gain insight into who people are, along with what motivates them. From an employer perspective, understanding the personality of a potential hire can shed light on their work style and how they might fit into the company's work culture

Answer:

aswer is A

Explanation:

because the CL,K,AR is correct since it is order right

Another process that contributes to the formation of rock at point R is the:

According to the given question, we need to find another process which can help with the rock formation at point R where the rock melts underground to form magma.

As a result of this, another process through which makes a significant contribution to the formation of rock at point R is the cooling of the lava as the magma which has been melted runs down the mountain.

Therefore, the correct answer is option B

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Answer:

I believe it's a.

Explanation:

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass of metal = 34 g

volume of metal = final volume of water - initial volume of water

volume = 25.3 - 22.3 = 3.0 mL

The density is

\(density = \frac{34}{3} \\ = 11.33333...\)

We have the final answer as

Hope this helps you

Answer:

b

Explanation:

Answer:

600 mL

Explanation:

molarity 1 * volume 1 = molarity 2 * volume 2. So this means 12 * 250 = 3000 and divide that by 5 to get 600 mL.

The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.

Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.

During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.

These factors contributed to the polar air mass:

During the colder months of the year, continental polar air typically forms over vast land masses.

A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.

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Answer:

The moon is closer to earth

Explanation:

Around each new moon and full moon, the sun, Earth, and moon arrange themselves more or less along a line in space. Then the pull on the tides increases, because the gravity of the sun reinforces the moon's gravity. ... Thus, at new moon or full moon, the tide's range is at its maximum.

In aqueous solutions, hydrogen bonds have similar bond strength as ionic bond interactions. Thus option B is the answer.

In aqueous solutions, ionic interactions occur between positively and negatively charged ions, which are held together by electrostatic forces. These forces are relatively strong and are responsible for the high melting and boiling points of ionic compounds. Hydrogen bonds, on the other hand, are a type of dipole-dipole interaction between the partially positive hydrogen atom of one molecule and the partially negative atom of another.

The strength of hydrogen bonds is about 5-10% of the strength of covalent bonds, which is similar to the strength of ionic bonds in aqueous solutions. This makes hydrogen bonds the type of bond or force that has similar bond strength as ionic bond interactions in aqueous solutions. These type of bonds are found in many biomolecules like DNA and RNA, proteins and many other natural and synthetic compounds.

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Answer:

(O)oxygen

Explanation:

hope it helps

The energy in the ground state of the electron confined in a 10 nm box is approximately 10.89 eV, and the energy in the first excited state is approximately 43.56 eV.

To calculate the energy of an electron confined in a 10 nm box, we can use the formula for the energy levels of a particle in a one-dimensional infinite potential well:

E_n = (n^2 * h^2) / (8 * m * L^2)

where:

E_n is the energy of the nth energy level,

n is the quantum number of the energy level (n = 1 for the ground state),

h is the Planck's constant (6.626 x 10^-34 J·s),

m is the mass of the electron (9.10938356 x 10^-31 kg),

L is the length of the box (10 nm = 10 x 10^-9 m).

Let's calculate the energy in the ground state (n = 1) and the first excited state (n = 2):

For the ground state (n = 1):

E_1 = (1^2 * h^2) / (8 * m * L^2)

Substituting the values:

E_1 = (1^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2)

Calculating this expression will give us the energy in the ground state.

For the first excited state (n = 2):

E_2 = (2^2 * h^2) / (8 * m * L^2)

Substituting the values:

E_2 = (2^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2)

Calculating this expression will give us the energy in the first excited state.

Please note that the energies calculated will be in joules (J). If you prefer electron volts (eV), you can convert the results by dividing by the electron volt value (1 eV = 1.602 x 10^-19 J).

Performing the calculations:

For the ground state:

E_1 = (1^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2) ≈ 1.747 x 10^-18 J

For the first excited state:

E_2 = (2^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2) ≈ 6.987 x 10^-18 J

Converting the energies to electron volts (eV):

E_1 ≈ 10.89 eV (rounded to two decimal places)

E_2 ≈ 43.56 eV (rounded to two decimal places)

Therefore, the energy in the ground state of the electron confined in a 10 nm box is approximately 10.89 eV, and the energy in the first excited state is approximately 43.56 eV.

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74 mph (64 KT)

Explanation:

when the wind exceeds 74 mph (64 KT), the storm is considered to be a hurricane.

The one that is directly involved in the initiation of dental caries is (C) sucrose.

Sucrose, a type of sugar, is directly involved in the initiation of dental caries, commonly known as tooth decay or cavities. When sucrose is consumed, oral bacteria, particularly Streptococcus mutans, use the sugar as a substrate and metabolize it to produce acids, particularly lactic acid.

These acids then lower the pH in the mouth, leading to demineralization of the tooth enamel, which is the outer layer of the teeth. Over time, this process can lead to the formation of cavities.

While the other options mentioned (crevicular fluid, dentin, lysozyme, and lactic acid) may have roles in dental health or caries development, they are not directly involved in the initiation of dental caries like sucrose is.

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Answer:

The change in smell

Explanation:

chemical reactions ccan lead to change in temperature, change in color and also change in smell