using a ph meter, you find the ph of an unknown solution to be 8.0. how would you describe this solution?

Answers

Answer 1

This solution is basic, meaning that it has a pH greater than 7.0. This means that there are more hydroxide (OH-) ions than hydrogen (H+) ions in the solution, creating an alkaline solution.

What is alkaline?

Alkaline is a term used to describe a substance with a pH greater than 7. Alkaline substances are considered basic, as opposed to acidic substances which have a pH of less than 7. Baking powder, milk of magnesia, and soap are examples of common alkaline compounds. Alkaline solutions are used in a variety of industries, such as food processing, chemical manufacturing, and pharmaceuticals. Alkaline solutions can be used to neutralize acidic substances, adjust pH levels, and increase the solubility of certain compounds. Additionally, alkaline solutions can be used to remove odors, stains, and grease from surfaces. Alkaline solutions can also be used in water treatment plants to reduce acidity levels and increase the effectiveness of chlorine.

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Related Questions

A McLeod gauge measures low gas pressures by com- pressing a known volume of the gas at constant temperature. If 345 cm of gas is compressed to a volume of 0.0457 cm³ under a pressure of 2.51 kPa, what was the original gas pressure?​

Answers

The pressure of a gas is the force that the gas exerts on the walls of its container.

How do you determine the initial pressure of a gas?

Let’s start with the ideal gas law, PV = nRT. In this equation, ‘P’ represents atmospheric pressure, ‘V’ represents volume in liters, ‘n’ represents the number of particles in moles, ‘T’ represents temperature in Kelvin, and ‘R’ represents the ideal gas constant (0.0821 liter atmospheres per moles Kelvin). The force that a gas exerts on the walls of its container is defined as its pressure.

When you blow air into a balloon, it expands because the pressure of air molecules on the interior of the balloon is greater than on the outside. Pressure is a characteristic that governs the direction of mass flow.

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Why C2H4 is non-polar?.

Answers

C2H4, also known as ethylene, is a non-polar molecule because its atoms are arranged symmetrically. The two carbon atoms are at the center of the molecule and are bonded to two hydrogen atoms each. The two hydrogen atoms on one side of the molecule are identical to the two hydrogen atoms on the other side, so there is no overall dipole moment (uneven distribution of electrons) in the molecule. This means that there is no separation of electrical charge and no polar bonds, making C2H4 a non-polar molecule.

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T/F All amino acid based hormones are lipid soluble and can cross the plasma membrane.

Answers

False All the amino acid based hormones are not lipid soluble and can not cross the plasma membrane.

Amino acid-derived as well as polypeptide hormones are water-soluble and insoluble in lipids. These hormones cannot pass through the plasma membranes of the cells; therefore, their receptors are found on the surface of the target cells.

Amino acids are those molecules which will combine to form proteins.  When the proteins are digested or broken down, amino acids will be left. The human body uses amino acids to make proteins to help out the body: Repair body tissue, Grow, and Perform many other body functions.

Amino acids are also be used as a source of energy by the body.

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In the activity series, the more active elements are found ____________.A. at the bottom. B. in the middle. C. at the top. D. Both (a) and (c)

Answers

Answer: At the top

What is Activity Series?

An activity scale is a kind of element classification system that ranks how responsive certain elements are to other elements. The activity series determines reactivity based on how well a particular element can displace hydrogen gas from acidic solutions and water.

Reactivity of elements:

The reactivity of metals is based on imperfect external orbitals or electronic configurations. Metals tend to donate electrons and thus form positively charged ions. Higher atomic number metals tend to be more reactive because their electrons are farther from the positively charged nucleus, making them easier to remove.

Hence, The most reactive metal is at the top of the row and the least reactive metal is at the bottom.

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Is NH3 and BF3 polar?.

Answers

[tex]NH_{3}[/tex] and [tex]BF_{3}[/tex] are both polar molecules.

This is because [tex]NH_{3}[/tex] has a net dipole moment due to its asymmetrical arrangement of electron distribution, while [tex]BF_{3}[/tex] has a non-zero dipole moment due to its trigonal planar shape.

[tex]NH_{3}[/tex] has a net positive charge at its central nitrogen atom due to the lone pair of electrons, while [tex]BF_{3}[/tex] has a net negative charge at its central boron atom due to its three bond pairs of electrons.

This difference in charge distribution of the two molecules results in a net dipole moment in each molecule.

In conclusion, [tex]NH_{3}[/tex] and [tex]BF_{3}[/tex] are both polar molecules, but [tex]NH_{3}[/tex] is more polar than [tex]BF_{3}[/tex] due to its asymmetrical electron distribution and higher dipole moment.

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How many molecules are present in 64g of SO2?.

Answers

To calculate the number of molecules present in 64 grammes of SO2, you first need to know the molar mass of SO2. The molar mass of SO2 is 64.06 g/mol.

Then, you can use the formula: moles = mass divided by molar mass

So, SO2 moles = 64/64.06

The molecular weight of SO2 is approximately 0.998.

Then, you can use Avogadro's number, which is 6.022 x 1023, to calculate the number of molecules:

Molecules = moles multiplied by Avogadro's number

So, molecules of SO2 = 0.998 x 6.022 x 1023

The number of molecules of SO2 present in 64 grammes is approximately 6.00 x 1023.

Note: This is an approximation because the real number of molecules present in 64 g of SO2 can be affected by experimental errors or other sources of uncertainty.

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If 2.09 mol of ethane (C₂H6) undergo combus-
tion according to the unbalanced equation
C₂H6+ O2 CO₂ + H₂O,
how many moles of O₂ is required?
Answer in units of mol. Answer in units of
mol.

Answers

7.32 moles of O2

For every mole of C2H6 you’ll get 2 moles of CO2 and 3 moles of H2O

We know this because the carbon and hydrogen has to be equivalent on both sides.

2.09 * 2 = 4.18 moles of CO2
2.09 * 3 = 6.27 moles of H2O

4.18 * 2 + 6.27 = 8.36 + 6.27 = 14.63 moles of O
14.63/2 = 7.32 moles of O2

What do you understand by molar mass?.

Answers

Answer:

Molar mass is the mass of a substance that has 6.022 × 1023 atoms

A ample of chloroform i found to contain 10. 1 g of carbon, 89. 6 g of chlorine, and 0. 85 g of hydrogen. If a econd ample of chloroform i found to contain 35. 6 g of carbon, what i the total ma of chloroform in the econd ample?

Answers

So, the empirical formula will be CHCl3.An ideal anesthetic was originally sought after via the use of the organic chemical chloroform.This substance has a 120.98 g/mol molar mass.

What is chloroform chemical formula?So, the empirical formula will be CHCl3.An ideal anesthetic was originally sought after via the use of the organic chemical chloroform.In 1831, it was initially made.The substance has the formula CHCl3.It is a thick, colorless liquid that has a sweet scent that is widely produced.Compounds of the elements carbon, hydrogen, and chlorine have the empirical formula C2 HCl.The molar mass of this chemical is 120.98 g/mol.It is frequently referred to as "chloroform" because of the molecule's molecular similarity to formic acid (CHOOH) [4].Chloroform can degrade and create dangerous chemicals like phosgene and hydrogen chloride while not being easily flammable.

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This is a two part question

Moles to volume (L). How many liters of H₂ are in
13.74 moles of H₂?

Volume (L) to moles. How many moles of O₂ are in
548 Liters of O₂?

Answers

1st question : There will be 308.76 liters of H₂ in 13.75 moles. 2nd question : There will be 24.48 moles of 548 liters of O₂ .

For first part, Given we have 13.74 moles of H₂. We know its molecular mass which is 2 grams/mole. Now calculating the total mass :
⇒molecular mass x moles

⇒ 2 x 13.74

27.48 grams

Now, we know that density = mass/volume, Therefore, Volume = mass/density. The density of Hydrogen gas is 0.089 g/l

∴ total mass/ density = volume

⇒27.48 grams/0.089 g/l

308.76 liters

For 2nd part, We can calculate total mass of Oxygen gas by the same density formula which is mass = density x volume. The density of oxygen gas is 1.43 g/l. Therefore,

⇒1.43 x 548

783.64 grams

Now, we can calculate moles by dividing total mass by molecular mas (molecular mass of oxygen gas is 32 grams/mole)

⇒ 783.64/32

24.48 moles

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If motion can produce electric currents from a magnetic field, how could magnets on a railroad provide electricity to a train?

Answers

Magnets on a railroad provide electricity to a train by electrifying the propulsion loops generates magnetic fields that both pull the train forward from the front and push it forward from behind.

What is a  magnetic field?

A magnetic field is described as a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

Electrodynamic suspension (EDS) uses superconducting electromagnets or strong permanent magnets that create a magnetic field, this  magnetic field induces currents in nearby metallic conductors when there is relative movement and hence  pushes and pulls the train towards the designed levitation position on the guide way thereby providing electricity.

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Is CCl4 a polar covalent bond?.

Answers

CCl4 is a nonpolar covalent bond.

This is because the molecule has a symmetrical shape, with the four chlorine atoms arranged around the central carbon atom in a tetrahedral formation. Because the electrons are distributed evenly around the central atom, there is no partial charge on any one side of the molecule, making it nonpolar.  As a result, the electrons are evenly distributed among the atoms, resulting in no partial charges. This creates a nonpolar bond because there is no separation of charge, meaning the bond is neutral and has no dipole moment. Additionally, chlorine is more electronegative than carbon, so the electrons are pulled closer to the chlorine atoms, further contributing to the nonpolar nature of the bond.  

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Identify the reagents needed to carry out each transformation, and identify the name of the reaction for each box

Answers

In a chemical reaction, reagents can be used to make, measure, or detect other compounds.

What are reagents in organic chemistry?

The term "reagent" in organic chemistry refers to a chemical component (a compound or combination, often composed of tiny inorganic or organic molecules) added to bring about the desired transformation of an organic substance. The Collins reagent, Fenton's reagent, and Grignard reagents are a few examples.

Reactants fluctuate during a chemical reaction, creating a variety of distinct products. While reactants are used to change compounds into new products, solvents are used to dilute solutions or dissolve soluble materials. This distinguishes solvents from reactants. 

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How many moles of NaOH are needed to make with 45 120 mL of 15% (mass/volume) solution?

Answers

360 moles of NaOH are needed to make with 45 120 mL of 15% solution.

What is mole ?

The term mole is defined as one mole of any substance is exactly equal to its atomic mass or molecular mass. It is expressed in grams.

The mole is also define as the amount of substance of a system which contains as many elementary entities. 1 mole = 6.023 X 10²³

Multiply the molarity by the volume of solution to get the number of moles of solute.

moles of solute = molarity × volume of solution

= 45 × 120 / 15

= 360 moles.

Thus, 360 moles of NaOH are needed to make with 45 120 mL of 15%  solution.

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Express the diameter of a ground-state hydrogen atom in meters using power of 10. Do not enter the units; they are provided to the right of the answer box:dH : m

Answers

The diameter of a ground-state hydrogen atom using the power of 10, in meters, is 1.058 x 10^{-10} using the value of Bohr radius of Hydrogen atom.

Throughout the development of particle physics, under modern science, scientists have created different models to understand the atom. When we talk about the diameter of an atom, we refer to the Bohr radius, which is the radius from the nucleus to the orbiting shell electron.

In the case of a hydrogen atom, it has one electron, and the Bohr radius in the ground state is 5.29 x 10^{-11} meters.

To find the diameter, we would have to multiply the Bohr radius by 2. as diameter is the double of radius.

Diameter of hydrogen in ground-state = 2 x 5.29 x 10^{-11}  meters

                                                                = 10.58 x 10^{-11} meters

Thus, the diameter of a hydrogen atom in ground-state, using the value of Bohr radius of hydrogen is 1.058 x 10^{-10} meters using power of 10.

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Would you expect hexane to be soluble in water why?

Answers

Hexane is not soluble in water.

Hexane is a hydrocarbon compound and is composed of only carbon and hydrogen atoms. Hydrocarbons are nonpolar molecules, and therefore they do not interact well with polar molecules such as water. Because of this, hydrocarbons like hexane tend to be insoluble in polar solvents like water.

Water molecules are polar, which means that they have a partial negative charge on one end and a partial positive charge on the other end. Nonpolar molecules such as hexane, do not have any charges, they do not interact well with water molecules because they do not have any charges to form hydrogen bonds with water molecules.

Furthermore, Hexane is less dense than water, which means that it will float on top of water and will not mix with it.

In summary, hexane is not expected to be very soluble in water because it is a nonpolar hydrocarbon and does not have any charges to interact with the polar water molecules.

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What volume of Argon gas (at STP) is equal to 1.60 grams of Argon?

Answers

1.60 grams of Argon gas at STP is equal to 11.2 L.

What is standard temperature and pressure?

Standard temperature and pressure (STP) is a set of conditions that are commonly used as a reference point for measuring the properties of gases and other substances. At STP, the temperature is defined as 0 degrees Celsius (273.15K) and the pressure is defined as 1 atmosphere (101.325 kPa).

The volume of a gas at standard temperature and pressure (STP) can be calculated using the ideal gas law:

PV = nRT

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

At STP, the pressure is 1 atm and the temperature is 0°C (273.15 K)

We can use the equation n = m/M , where n is the number of moles, m is the mass and M is the molar mass.

Given that the mass of Argon is 1.60 grams, we can calculate the number of moles:

n = m/M = 1.60/40 = 0.04 mol

We can substitute the value of n, P, T and R into the ideal gas law to calculate the volume.

V = nRT/P = 0.04 mol * 8.314 J/mol*K * 273.15 K / 1atm = 11.2 L

Therefore, 1.60 grams of Argon gas at STP is equal to 11.2 L.

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Biodiversity hotspots are areas that have been characterized by

A being most threatened areas with high diversity of species
B being located in only one region around the world
C having low diversity of organisms
D are not threatened by human activities and loss of habitat

Answers

Answer:

Pretty sure it's A

Explanation:

What is theoretical yield in moles of oxygen when there are 18.3 moles of hydrogen ?

2H2 + O2 --> 2H2O

Answers

The theoretical yield of the water in the reaction is 329.4 g.

What is the theoretical yield?

We know that we can be able to obtain the theoretical yield when we look at the stoichiometry of the reaction that we have here. In this case, it is clear that would need to rely on the reaction equation and it would be our guide.

We have that;

2 moles of hydrogen would produce 2 moles of water

18.3 moles of hydrogen would also produce 18.2 moles of water.

Theoretical yield of water would now be;

18.3 * 18 g/mol

= 329.4 g

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For an element X it is given that atomic number = 17 and mass number equal 35 write the electronic electron configuration of element X find valency what will be the formula of compound formed between X and Y having valency 3.

Answers

Answer:

Electronic configuration of Cl = 2,8,7

Valency of Cl = -1

Explanation:

Given,

The atomic number of X = 17

  Element with atomic number 17 = Chlorine(Cl)

The mass number of element = 35

Electronic configuration of Cl = 2,8,7

Valency of Cl = -1

Where are the biggest biodiversity hotspots around the world?

1)Tropical Rain Forest
2)Islands
3)Coral Reef
4)The National Park

Answers

Answer: #1 is the awnser

Explanation: trus me

Halogens exist in different physical states despite being in the same group. Explain why this is so.​

Answers

Halogens exist in different physical states despite being in the same group because the reliance on the number of electrons. More and stronger interactions between molecules influence higher temperatures (specifically boiling points). As the atoms increase in size, they grow farther from the center point and are less attracted to it.

how do I balance this?

Answers

Answer:

4NaHCO3---->2Na2CO3+2CO2+2H2O

what type of chemical bond forms between two atoms bearing opposite charges?

Answers

Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.

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The modern periodic table arranges the element in order of the increasing

O atomic mass
O atomic number
O mass number
O atomic mass unit

Answers

Answer:

atomic number

Explanation:

# of protons

The amount of energy required to change 20g of H₂0 to steam is +50 kJ. Calculate the standard heat of vapourization.​

Answers

The standard heat of vaporization of H₂0 is +2.5 kJ/g.

What is standard heat?

The standard heat of formation  of a compound is described as the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.

To calculate it, we need to divide the total energy required to change the 20g of H₂0 to steam by the amount of substance being vaporized.

The amount  is 20 g

the total energy required = 50kj

Therefore the standard heat of vaporization of H₂0 is   20/50 = +2.5 kJ/g

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What i a cenario where it might be important for you to meaure or calculate volume correctly and why

Answers

Volume is the amount of space an object takes up. It is typically measured using cubic units, and estimated using a variety of formulas. For example, a rectangular bathtub that is 1 foot tall, 2 feet wide, and 4 feet long will have a volume of 8 cubic feet.

Finding the volume of an object can help us to determine the amount required to fill that object, like the amount of water needed to fill a bottle, an aquarium or a water tank.

How to measure volume

Volume is the measure of the 3-dimensional space occupied by matter, or enclosed by a surface,” according to the National Institute of Standards and Technology’s U.S. Office of Weights and Measures. Simply stated, it is the amount of liquid or gas that will take up a defined space.

Commonly measured in cubic units, the standard unit of volume is a cubic meter. Depending on what you are measuring, you can then break it down into the smaller cubic decimeter—known as a liter—and the cubic centimeter, better known as a milliliter

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What is the need of energy efficiency in cloud computing?.

Answers

By optimizing the energy use of cloud computing, businesses can save money on their energy bill and reduce their carbon footprint.

Cloud computing is becoming increasingly popular due to its cost-effectiveness and scalability, but it comes with a cost: energy.

As businesses continue to invest in cloud computing, it is important to understand the need for energy efficiency and the ways this can be achieved.

Furthermore, the most efficient cloud computing systems are more reliable and resilient, making them ideal for businesses that rely on cloud-based services. Investing in energy efficient cloud computing not only saves money, but also helps the environment.

To ensure cloud computing remains a viable long-term solution for businesses, it’s essential for companies to take steps to ensure their cloud infrastructure is energy efficient.

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Which term names the result of two or more atoms combined chemically? A. compound B. gas C. element D. reactant

Answers

The result of two or more atoms combines chemically is a molecule. A molecule can also be referred as a compound. Hence the answer to the question is Option A.

Any substance or matter that undergoes a chemical change occurring in a given reaction, especially present at the start of the reaction is called a reactant.

A substance or matter in a state in which it expands freely to fill the whole of space as in container, having no fixed shape (unlike a solid) and having no fixed volume (unlike a liquid) is called a gas.

One of a class of substances or components, that cannot be separated or divided into simpler substances by any chemical means is called an element.

A distinctly formed substance formed by chemical union of two or more ingredients/components such as atoms in definite proportion by weight is called a molecule. A molecule is a group or combined state of two or more atoms held together by chemical bonds.

A compound is a substance/matter which is formed by two or more different types of elements/atoms of elements which are united chemically in a fixed proportion.

Thus, All molecules are not compounds. But, All compounds are molecules.

Hence, the correct answer should be Option A i.e. compound.

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Answer:

compound

Explanation:

no.

How would I balance this?

Answers

The balanced equation would be [tex]16Cr(s) + 3S_8(s) --- > 8Cr_2S_3 (s)[/tex].

Balancing chemical equation

A balanced chemical equation will have as many atoms of different elements in the products as in the reactants. In other words, a balanced chemical equation will obey the law of conservation of atoms.

According to the law of conservation of atoms, atoms can neither be created nor destroyed but can be converted from one form to another during the course of chemical reactions.

Following this law, the balanced equation for the reaction would be [tex]16Cr(s) + 3S_8(s) --- > 8Cr_2S_3 (s)[/tex]

There are 16 Cr atoms on both sidesThere are 24 S atoms on both sides

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