hi, can someone help me with these
why do hydrogen sulfide has a low boiling point

The ph of the basic solution will always be having the ph value above 7 in the ph scale.

what is the ph scale  ?

The pH scale is a numerical scale ranging from 0 to 14. It indicates whether an aqueous solution is acidic or alkaline. The pH scale is used to determine whether a solution is acidic, alkaline, or neutral.

Neutral solutions have a pH of 7.

The pH of acidic liquids is less than 7. The closer a solution is near pH 0, the more acidic it is.

The pH of alkaline solutions is greater than 7. The closer a solution is near pH 14, the more alkaline it is.

Acidic, alkaline, or neutral solutions are all possible. Pure water, for example, has a pH of 7 and is neutral. Because a solution of common salt (sodium chloride) is neutral, it has a pH of 7.

The word aqueous solution is frequently used in science. It is used to define a water-based solution. Only water-based solutions may be used to assess pH.

As a result, we may determine the pH of a solution whic is basic will be having the ph value above seven.

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In Beaker A, an antacid tablet is added to 50 mL of 20ºC water. In Beaker B, an antacid tablet is added 50 mL of 70ºC water reaction occur faster in the beaker B

Antacid tablet are the medicine for acid in the stomach to relieve indigestion and heartburn and in the given data in beaker A the antacid tablet is added in 50mL of 20ºC water and then in beaker B an antacid tablet is added 50 mL of 70ºC water then in beaker B the reaction will occur fast because in beaker B the temperature of water is more than beaker A so the antacid tablet will dissolve fastly in more temperature than in less temperature

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Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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Answer:

speed is a scalar quantity and velocity is a vector quantity.

Speed is distance/time and velocity is displacement/time

Answer:

Velocity is vector and speed is scalar

Explanation:

Answer:

Hard water is water that has high mineral content, Soft water is free from dissolved salts of such metals as calcium, iron, or magnesium

Explanation:

Balanced net ionic equation for precipitation reaction.

Ca2+ + C202 -> CaC204

Balanced net ionic equation for titration reaction.

6H+ + 5H2C2O4 + 2MnO4 210C02+ 2Mn2++8H20

Oxidizing agent = KMnO4

A substance that has the ability to oxidize other substances or in other words, a substance that has the ability to give oxygen or replace hydrogen on reaction with other compounds are called oxidising agents . Example : oxygen, halogens etc.

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The article "Treatment of early-stage erythematotelangiectatic rosacea with a Q-switched 595-nm Nd:YAG laser" by Goo BL, Kang JS, Cho SB (2015) focuses on the use of a specific laser, the Q-switched 595-nm Nd:YAG laser, for treating early-stage erythematotelangiectatic rosacea.

The study is published in the Journal of Cosmetic and Laser Therapy, volume 17, issue 3, pages 139-142. The mentioned article investigates the effectiveness of using a Q-switched 595-nm Nd:YAG laser in the treatment of early-stage erythematotelangiectatic rosacea, a common skin condition characterized by facial redness and visible blood vessels. The study aims to evaluate the outcomes of this laser treatment modality.

The Q-switched 595-nm Nd:YAG laser is a specific type of laser that emits light at a wavelength of 595 nanometers (nm). This particular wavelength is targeted at the blood vessels and redness associated with rosacea, aiming to reduce the visible signs and symptoms.

The authors likely conducted a clinical study involving patients with early-stage erythematotelangiectatic rosacea and assessed the efficacy of the laser treatment. The article may include details on the treatment protocol, the number of sessions, the outcomes observed, and any side effects or complications reported.

Overall, this study contributes to the understanding of the use of the Q-switched 595-nm Nd:YAG laser as a potential treatment option for early-stage erythematotelangiectatic rosacea, providing insights into its effectiveness and potential benefits for patients with this condition.

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The child needs 1,569.25 mg of amoxicillin per day, with 784.63 mg of amoxicillin per dose.

Streptococcus infections are commonly treated with amoxicillin, a broad-spectrum antibiotic.

Amoxicillin is effective against many different types of bacteria, including Streptococcus bacteria.

When a child has a streptococcus infection, amoxicillin may be prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d.

In this case, a 76.8 lb child would be given 1,385.28 mg of amoxicillin per day, divided into two equal doses, for a total of 692.64 mg per dose.

Amoxicillin is a penicillin antibiotic used to treat infections caused by bacteria.

It is effective against many different types of bacteria, including streptococcus bacteria.

The required dosage of amoxicillin for a child is determined by their body weight and the extent of the infection they are experiencing.

In this case, the child weighs 76.8 lbs, which is equivalent to 34.85 kg.

The dosage of amoxicillin is 45 mg per kg of body weight per day, so the child needs 1,569.25 mg of amoxicillin per day.

This dosage is divided into two equal doses, so the child needs 784.63 mg of amoxicillin per dose.

Since amoxicillin is often taken orally, this dosage can be provided in the form of a tablet, suspension, or chewable tablet.

The duration of amoxicillin treatment will depend on the severity of the infection and the response of the child to the treatment. Generally, amoxicillin treatment lasts for 10 to 14 days.

The child should continue taking amoxicillin for the full prescribed course, even if they start feeling better before the treatment is completed.

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Answer:

C. Carbon

Explanation:

Carbon has an electronegativity of 2.55, followed by Tin at 1.96, Silicon at 1.90 and the least electronegative would be Lead at 1.87.

An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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Answer:

The correct answer would be D) chlorophylls.

Explanation:

Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.

The pH of the solution is approximately 0.444.

To find the pH of the solution, we need to first determine the concentration of the diluted solution.

Given:
Initial volume (V1) = 572.0 mL
Initial concentration (C1) = 0.6300 M
Final volume (V2) = 1.000 L

We can use the dilution formula to find the concentration of the diluted solution:
C2 = (C1 * V1) / V2

Substituting the given values:
C2 = (0.6300 M * 572.0 mL) / 1.000 L
C2 = 0.3604 M

Now, we can use the formula for calculating pH, which is given by:
pH = -log[H+]

Since HCl is a strong acid, it completely dissociates into H+ ions. Thus, the concentration of H+ ions in the solution is equal to the concentration of the HCl.

Therefore, the pH of the solution is:

pH = -log(0.3604)
pH ≈ 0.444

So, the pH of the solution is approximately 0.444.

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Answer:

See below!

Explanation:

To find the symbol of the element, you have to use the periodic table.  

The mass number is the number of protons and neutrons in the atom.  

The atomic number is the number of protons in the atom.

You can find the number of protons from the periodic table.

You can find the neutrons by subtracting the mass number by the number of protons in the atom.

Unless you have an ion, you will have the same amount of electrons as you do protons.

To write in nuclear notation, you write the chemical symbol with the mass number and atomic number shown in the attachment.  It is preferable to have the mass number and atomic number directly above each other.

Carbon is classified as a nonmetal.

Answer:

b

Explanation:

everyone looks even a little bit like their parents, even trees

Irrespective of the mode of reproduction, the offsprings will have traits that depends directly on its parents,s genetic material. Hence, option C is correct.

Genetic material in a living cell is the basic unit of the cell. The DNAs , deoxyribose nucleic acid are the genetic material which determines our all characteristics.

DNAs are double stranded molecules having double helical structure with nitrogen base pairs as the steps in the helical staircase model. These genetic materials are specific for each organisms.

DNAs are located inside the nucleus where chromosomes are covering the DNAs. During cell division one DNA will replicate into two identical DNAs and that is transferred to offsprings. Thus, cell division results in two genetically identical daughter cells and which are inherited to the offsprings.

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Four of the valencies on the tetrahedron of carbon point in the directions of its four angles. The tetrahedron's core is made up of carbon atoms. Each valency has a 10928′ bond angle.

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Answer:

B. 75.0 kPa

Explanation:

P1V1/T1=P2V2/T2

(x * 100 L)/(300 K)=(100 kPa * 50.0 L)/(200 K)

x=75.0 kPa

Answer:

24rq3r54

Explanation:

3t5q6tq6tq

Answer:

C

Explanation:

Answer:

Sugar will dissolve, so water.

Explanation:

Sugar is a bicubacle food source you could say, sand will not evaporate or dissolve in the water since it is not a 3c2e source. Using water will seperate them.

Answer: Heat

Explanation:

Because is you put water and sand in a container you can separated by boiling the water and all the water would evaporate and the sand would stay.

The process of wood burning in a fireplace is exothermic, ice melting into liquid water is endothermic, When an acid and a base are mixed, and the test tube feels hot, it indicates an exothermic reaction and When a solid dissolves into a solution, and the ice pack feels cold, it indicates an endothermic process.

1. Wood burns in a fireplace: This process is exothermic. When wood undergoes combustion, it reacts with oxygen in the air, releasing energy in the form of heat and light. The chemical bonds in the wood are broken, and new bonds are formed with the oxygen. The overall reaction releases more energy than it absorbs, resulting in a net release of heat to the surroundings.

2. Ice melts into liquid water: This process is endothermic. When ice absorbs heat energy from its surroundings, the intermolecular forces holding the water molecules in a solid lattice are weakened. As the temperature increases, the kinetic energy of the water molecules also increases, causing them to break free from the rigid structure and transition into the liquid phase. The energy absorbed is used to overcome the attractive forces between the water molecules and is stored as potential energy.

3. Acid and base are mixed, making the test tube feel hot: This process is exothermic. When an acid and a base react, they undergo a neutralization reaction, which releases energy in the form of heat. The reaction involves the transfer of protons (H+) from the acid to the base, forming water and a salt. The breaking of the acid-base bonds and the formation of new bonds in the products release energy, resulting in an increase in temperature.

4. A solid dissolves into a solution, making the ice pack feel cold: This process is endothermic. When a solid dissolves in a solvent, such as water, energy is required to break the intermolecular forces holding the solid particles together. As the solid particles separate and disperse throughout the solvent, they interact with the solvent molecules. This interaction requires an input of energy, typically in the form of heat, from the surroundings. The energy absorbed from the surroundings lowers the temperature, causing the ice pack to feel cold.

It's important to note that the terms "endothermic" and "exothermic" refer to the net energy change of a process. Endothermic processes absorb energy from the surroundings, while exothermic processes release energy to the surroundings.

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Answer:

86.96

Explanation:

Answer: A substance is a particular kind of matter with uniform properties

Explanation:

The correct option is D as when sterilizing laboratory equipment with ethanol and a flame, neither option A nor option C should be done.

To reduce the chance of accident or fire when sterilizing lab equipment using ethanol and flame, it is important to follow the correct safety procedures. It is important to keep the alcohol completely away from the flame, not just as far away as possible. When exposed to an open flame, even small amounts of vapor from ethanol can catch fire.

It is also unwise to point the tip of the sterilizing tool upwards as given in option C. Any leftover ethanol may collect at the tip of the tool if it is held with the tip up, which increases the chance of flaring or igniting when it comes in contact with the alcohol.

Therefore, the correct option is D.

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Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

Diamond is a network solid.

In diamond, carbon atoms are bonded together by extended covalent bonds. Each carbon atom forms four strong covalent bonds with its neighboring carbon atoms, creating a three-dimensional network of carbon-carbon bonds throughout the crystal lattice.

Diamond is a type of solid known as a covalent network solid. In covalent network solids, the atoms are held together by a network of strong covalent bonds, extending throughout the entire crystal structure. This results in a very rigid and hard material with high melting and boiling points.

Other examples of covalent network solids include graphite and quartz. Due to its strong and interconnected carbon-carbon bonds, diamond is renowned for its exceptional hardness and is one of the hardest known naturally occurring materials.

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Answer:

chlorie (Cl)

Explanation:

aluminum is a metal.

potassium is a metal.

calcium is a metal.

But chlorine is a nonmetal.

brainlest??

Answer:

O2

Explanation:

The compound that contains only nonpolar covalent bonds is the Oxygen molecule (O2). Thus, the correct option for this question is A.

A Covalent bond may be defined as a type of chemical bond that significantly involves the sharing of electrons to construct electron pairs between atoms. A covalent bond is always made when the distinction between the electronegativities of two atoms is too small for an electron transfer to take place to form ions.

A non-polar covalent bond is a kind of chemical bond that is formed when electrons are shared equally between two atoms of the same molecule. Here, O2 forms a double bond between each atom of oxygen.

While CO2, H2O, and NO3 form polar covalent bonds. This type of bond exists when atoms with distinctive electronegativities share electrons in a covalent bond.

Therefore, O2 is a compound that contains only nonpolar covalent bonds. Thus, the correct option for this question is A.

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Answer:

Well elements are chemical substances while a compound consists of two or multiple elements put together.

Explanation:

Answer:

Elements

iron,

copper,

silver,

gold,

hydrogen,

carbon,

nitrogen,

and oxygen.

Compounds

Sugar (sucrose - C12H22O11)

Table salt (sodium chloride - NaCl)

Water (H2O)

Carbon dioxide (CO2)

Sodium bicarbonate (baking soda - NaHCO3)