When the leveling bulb is higher than the water level, the pressure in the system is greater than atmospheric pressure. true /false

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it. ... Covalent bonds form when sharing atoms results in the highest stability. Other types of bonds besides ionic and covalent chemical bonds exist, too.

The classification of the alcohols gives;

Organic compounds occurs in families. The family of compounds is called a homologous series. The homologous series always have a functional group. The functional group is the atom, group of atoms or bond that is responsible for the chemical reactivity of the members of a given homologous series.

Now we know that the alcohols are those organic compounds that contains the -OH group. The could be aliphatic or alicyclic compounds. We shall now proceed to name the kind of alcohols that each of the compounds shown are;

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The mole ratio of oxygen to pentane in the balanced equation is 8:1.

In the given equation, the coefficient in front of pentane (C5H12) is 1, indicating that 1 mole of pentane is combusted. On the other hand, the coefficient in front of oxygen (O2) is 8, suggesting that 8 moles of oxygen are needed to react with 1 mole of pentane. Therefore, the mole ratio of oxygen to pentane is 8:1.

In simpler terms, for every 1 mole of pentane that undergoes combustion, you would need 8 moles of oxygen to fully react with it and form the products mentioned in the equation. This mole ratio of 8:1 indicates the stoichiometry of the reaction, allowing us to determine the relative amounts of reactants and products involved.

The mole ratio is an essential concept in stoichiometry, helping us understand the quantitative relationships between different substances in a chemical reaction. It allows us to calculate the amounts of reactants needed or products formed based on the balanced equation. In this case, the mole ratio of 8:1 tells us that a larger quantity of oxygen is required compared to pentane for complete combustion to occur.

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Answer:

explain futher pls

Explanation:

Answer:

Tree and Grass?

Explanation:

hope it helps pleass mark me as brainliest answer

The pH of the solution will be 10.47.

The pH of a solution is mathematically given as:

 pH = - log [\(H^+\)] of -log [\(H_3O^+\)]

Thus, in this case, with  [\(H_3O^+\)]  of 3.4 x 10-¹¹ M:

pH = -log 3.4 x \(10^-^1^1\) = 10.47

Thus, the pH of the solution will be 10.47.

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Explanation:

C they would be arranged in a bent Orientation

Answer:

B

Explanation:

They would be arranged in a trigonal planar orientation.

Answer:

20cm=the length of the causation that it loads about the contrasting of the solution it is an easy question to answer it just has too many parts I answered one and I hope it helped to give you a hint towards solving the whole thing good luck

Explanation:

I tried!

In a titration, 20 cm3 of 2.0 mole dm-3 HCl reacted with 25 cm3 of NaOH. The concentration of the sodium hydroxide is 1.6 mole.

Titration  is defined as the procedure of determining the quantity of some ingredient of a sample by introducing a precisely known quantity of another substance to the measured sample with whereby the desired ingredient interacts in a predictable manner.

There are basically four type of titration.

M1V1 = M2V2

The concentration of the sodium hydroxide

M2 = M1V1 / V2

M2 = 2.0 x 20 / 25

M2 = 1.6 mole

The concentration of the sodium hydroxide = 0.08 mole

The concentration of the sodium hydroxide = 0.12 mole

The concentration of the sodium hydroxide  = 0.912 mole

Thus, in a titration, 20 cm3 of 2.0 mole dm-3 HCl reacted with 25 cm3 of NaOH. The concentration of the sodium hydroxide is 1.6 mole.  

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Answer:

t = 1800 s

Explanation:

Given data:

Velocity of bicycle = 10 m/s

Distance cover = 18 Km

Time taken = ?

Solution:

Distance cover = 18 Km (18km×1000m/1km=18000 m)

Formula:

Velocity = distance/ time

by putting values,

10 m/s = 18000 m/ t

t =  18000 m/ 10 m/s

t = 1800 s

Answer:

Seafloor spreading

Explanation:

a) The explosiveness of hydrogen gas is a chemical property.

b) The bronze color of copper is a physical property.

c) The shiny appearance of silver is a physical property.

d) The ability of dry ice to sublime (change from solid directly to vapor) is a physical property.

Chemical properties are properties that describe the behavior of a substance during a chemical reaction or a chemical change. Explosiveness of hydrogen gas is an example of a chemical property because it describes how hydrogen gas reacts with oxygen to form water and how the reaction releases a large amount of energy in the form of an explosion.

Physical properties, on the other hand, are properties that describe the characteristics of a substance that can be observed or measured without changing the composition of the substance. Examples of physical properties include the color, texture, and melting point of a substance. The bronze color of copper and the shiny appearance of silver are both examples of physical properties.

The ability of dry ice to sublime (change from solid directly to vapor) is also a physical property because it describes a physical change that occurs when dry ice is heated or exposed to high pressure.

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The mass number of the isotope of cobalt that contains 33 neutrons is 60.

The mass number is calculated by adding the number of protons and neutrons in the nucleus of the atom. The atomic number of cobalt is 27, so the number of protons in the nucleus is 27. The number of neutrons is 33, so the mass number is 27 + 33 = 60.

The mass number of an atom is the sum of the number of protons and neutrons in the nucleus of the atom. The atomic number of an atom is the number of protons in the nucleus of the atom. The number of neutrons in the nucleus of an atom can vary, and these different forms of the same element are called isotopes.

In the case of cobalt, the most common isotope is cobalt-59, which has 27 protons and 32 neutrons. However, there are other isotopes of cobalt with different numbers of neutrons. For example, the isotope of cobalt that contains 33 neutrons has a mass number of 60.

The different isotopes of an element can be used for different purposes. For example, cobalt-60 is used in medical treatments, while cobalt-59 is used in industrial applications.

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The elements that have atomic radii larger than S are Al, Na, P, and Se.

The correct options are A, C, E, and F.

The atomic radii of elements are defined as the distance between the nuclei of two covalently bonded nuclei of atoms of elements.

Atomic radii of elements show periodicity.

The atomic radii of elements increase from top to down in a group in the periodic table whereas the atomic radii of elements decrease from left to right across a period in the periodic table.

Comparing the atomic radii of sulfur, S, and the given elements:

Al has a larger atomic radii

Cl has a smaller atomic radii

Na has a larger atomic radii

O has a smaller atomic radii

P has a larger atomic radii

Se has a larger atomic radii

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The final concentration of the KOH solution after dilution is approximately 0.0174% (m/v).

To calculate the final concentration of the solution, we need to consider the amount of solute (KOH) before and after dilution.

Given:

Initial volume of the KOH solution = 11.0 mL

Initial concentration of the KOH solution = 23% (m/v)

Final volume of the solution after dilution = 120.0 mL

The initial concentration of 23% (m/v) means that there are 23 grams of KOH dissolved in 100 mL of the solution.

First, let's calculate the amount of KOH in the initial solution:

Initial amount of KOH = (23% / 100) * 11.0 mL

To find the final concentration, we need to determine the amount of KOH after dilution. Since the volume is diluted to 120.0 mL, we can set up the following equation based on the conservation of moles:

Initial amount of KOH = Final amount of KOH

((23% / 100) * 11.0 mL) = Final concentration * 120.0 mL

Simplifying the equation:

Final concentration = ((23% / 100) * 11.0 mL) / 120.0 mL

Calculating the final concentration:

Final concentration = (0.23 * 11.0 mL) / 120.0 mL

Final concentration = 0.020875 mol / 120.0 mL

To convert the concentration to a percentage, we multiply by 100:

Final concentration = (0.020875 mol / 120.0 mL) * 100

Final concentration ≈ 0.0174% (m/v)

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Answer:

Product concept generation is a process that starts with a list of parameters set by the customer regarding his needs and specifications. Based on the requirements, concept generation helps to pinpoint a variety of possible solutions and ideas that answers those needs.

Explanation:

The word "generate concepts" refers to the process of generating new ideas, thoughts, or mental constructs that reflect abstract or tangible entities, relationships, or phenomena.

Create new ideas, concepts, or mental models to represent abstract or tangible entities, relationships, or phenomena is what is meant when something is said to "generate concepts." Through imaginative reasoning, analysis, synthesis, and abstraction, new and original concepts are created or current concepts are developed.

Concept generation frequently entails cognitive operations including brainstorming, critical analysis, creative imagination, and problem-solving. It can be a purposeful and conscious attempt to investigate and build upon already-known information or to develop completely original concepts.

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The energy required for the complete removal of 1 mol electron from an atom or ion in the gaseous state is known as ionization energy.

What is Ionization Energy?

Ionization energy is a physical value that determines the amount of energy required to remove an electron from a gaseous atom or ion. When an electron is completely removed from an atom, it transforms into an ion. Therefore, ionization energy is also known as ionization potential.

An example of ionization energy can be, the ionization energy of sodium is the quantity of energy required to remove one electron from a sodium atom in the gaseous state.

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Answer:

30 atoms

Explanation:

2Ni(H₃O₄)₂

There are two nickel, twelve hydrogen and sixteen oxygen atoms are present in given formula.

The given formula is actually having two moles of Ni(H₃O₄)₂.

Thus in two mole total number of atoms are = 2+12+16 =30 atoms

In one mole there are one nickel atom, six hydrogen atom and eight oxygen atoms are present.

Thus in one one mole total number of atoms are = 1+6+8 =15 atoms

However this compound does not exist.

Answer:

11.9 g of nitrogen monoxide

Explanation:

We'll begin by calculating the number of mole in 6.75 g of NH₃. This can be obtained as follow:

Mass of NH₃ = 6.75 g

Molar mass of NH₃ = 14 + (3×1)

= 14 + 3

= 17 g/mol

Mole of NH₃ =?

Mole = mass /molar mass

Mole of NH₃ = 6.75 / 17

Mole of NH₃ = 0.397 mole

Next, we shall determine the number of mole of NO produced by the reaction of 0.397 mole of NH₃. This can be obtained as follow:

4NH₃ + 5O₂ —> 4NO + 6H₂O

From the balanced equation above,

4 moles of NH₃ reacted to produce 4 moles of NO.

Therefore, 0.397 mole of NH₃ will also react to produce 0.397 mole of NO.

Finally, we shall determine the mass of 0.397 mole of NO. This can be obtained as follow:

Mole of NO = 0.397 mole

Molar mass of NO = 14 + 16 = 30 g/mol

Mass of NO =?

Mass = mole × molar mass

Mass of NO = 0.397 × 30

Mass of NO = 11.9 g

Thus, the mass of NO produced is 11.9 g

Additives designed to speed up the chemical reactions of monomers are called catalysts. So the correct option is Catalysts. Where catalysts are chemical compounds that are added to accelerate or decelerate a chemical reaction without being consumed during the process.

It modifies the reaction rate and does not impact the equilibrium constant or the thermodynamic properties of a chemical reaction.

A catalyst can work in different ways to speed up a chemical reaction, including by reducing the activation energy and increasing the number of successful collisions between reacting molecules.

Thus, additives designed to speed up the chemical reactions of monomers are called catalysts. So the correct option is Catalysts.

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Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

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C12H22O11 (s) + 12O2 (g) ⇒ 12CO2 (g) + 11H2O (g)

Answer:

Atoms that are isotopes have the same number of protons.

Answer: come on man its not that hard

Explanation:

Temperature stays the same during state of matter change. After plotting the graph of temperature vs time and the curve is outlined, the moment the graph plateaus read the temperature that is constant(repeatedly occurs).

From the points given in the table of value, am sure the melting point is 78°C.

All the best!

Dominant

Explanation:

Meaning that particular gene is stronger than the others.

Absolute zero is an idea in thermodynamics that describes the lowest energy system.

Thermodynamics

Thermodynamics is the study of thermal energy and heat. One of the most important ideas in thermodynamics is entropy. Entropy is defined as the chaos within a system. Chaos is the movement or different orientations of molecules in a system. Entropy is related to temperature; the higher the temperature, the higher the entropy. High entropy means there is a large amount of chaos in a system, while low entropy is low chaos.

Absolute zero

Absolute zero occurs when the temperature of a system is 0 kelvin or -273.15 °C. Zero kelvin is the theoretical temperature in which entropy equals 0. This means that there is no movement or energy within a system. Absolute zero is the lowest energy a system can possibly have.

Answer:

Look at the pH level.

Explanation:

The best way to determine whether a solution is acidic or basic is to look at its pH level. The pH of a solution is a number between 0 and 14.

If a solution has a pH of less than 7, then it is acidic.

If a solution has a pH of 7, then it is neutral.

If a solution has a pH of greater than 7, then it is basic.

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