how many protons are in each of the following

Answer:

0.1M

Explanation:

Using Neutralisation formula,

MaVa=MbVb

>>(0.25)(40)=Mb(100)

Mb=0.1M

Answer:

Testable questions can be answered through investigations that involve experiments, observations, or surveys. Testable questions are answered by collecting and analyzing evidence that is measurable. Testable questions relate to scientific ideas rather than personal preference or moral values.

Explanation:

hope this helps

The correct answer is 0.100 M.

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M. Most frequently, moles of solute per liter of solution are used to express molar concentration or molarity. We can translate between the volume of the solution and the moles (or mass) of the solute using molar concentration.

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To determine the number of moles of hydrogen needed to crack one mole of the long saturated hydrocarbon chain (C40H82), we can analyze the reactants and products involved in the cracking reaction.

The cracking reaction is given as: C40H82 -> 3 C8H18 + n C2H6. From the equation, we can see that one mole of the long hydrocarbon chain (C40H82) produces three moles of octane (C8H18) and n moles of ethane (C2H6). Since the cracking process involves breaking the carbon-carbon bonds and forming new carbon-hydrogen bonds, the number of hydrogen atoms in the products should remain the same as in the reactant.

The long hydrocarbon chain (C40H82) contains 82 hydrogen atoms, and the products, 3 moles of octane (C8H18), contain (3 moles) * (18 hydrogen atoms/mole) = 54 hydrogen atoms. Therefore, the number of moles of hydrogen needed for cracking one mole of the long hydrocarbon chain can be calculated as: Number of moles of hydrogen = 82 - 54 = 28 moles. Hence, 28 moles of hydrogen are required to crack one mole of the long saturated hydrocarbon chain (C40H82).

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A. Light waves travel at a speed of about 300,000,000 m/s in empty  space.

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Answer:

A

Explanation:

i took the quizz .

Explanation:

Magnets actually do both attract and repealto each other. Magnets repeal similar poles where as attract opposite poles.

Answer: 0 65 (I’m pretty sure I’m trying to learn by teaching so bare with me)

Explanation: avg(5, 125)

Answer: This makes the lemonade a homogenous mixture

Explanation:

If the freshly squeezed lemonade is made by squeezing lemons to extract the sour juice and mixing this with water and sugar all the substances in the mixture finally created are in the same phase.

Answer:

B.

Explanation:

Answer:

B.

email her superviser so that he can respond to the sender's question.

The initial amount of iodine-125 in a 500mg sample is not provided. Therefore, the only way to find the mass remaining after 300 days is to make use of the half-life and the concept of exponential decay.

The general formula for the amount remaining after time t is given by:

A(t) = A₀(1/2)^(t/h)

where A₀ is the initial amount, t is the time elapsed, h is the half-life, and A(t) is the amount remaining after time t.

In this case, we have h = 60 days and t = 300 days.

Substituting these values into the formula above, we get:

A(300) = A₀(1/2)^(300/60)A(300) = A₀(1/2)^5A(300) = A₀(1/32)

Therefore, the mass remaining after 300 days is 1/32 times the initial mass.

If we let x be the initial mass, then the mass remaining is (1/32) x

The problem states that the answer should be given in milligrams, so we must convert the mass remaining to milligrams. If the initial mass is x milligrams, then the mass remaining is:(1/32) x milligrams.

The answer is 15.625 mg.

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Answer:

substances

Explanation:

A chemical reaction happens when substances break apart or combine to form one or more new substances.

^Hope it helps, Hazel^

Answer:

<br> a) Barium chloride and sodium sulphate aqueous solutions react to give insoluble barium sulphate and aqueous solution of sodium chloride.

Explanation:

Characteristics of Liquids

Liquids have definite volume, but indefinite shape. They are free to form droplets and puddles when they are not inside a container. When a liquid is inside a container, it will take its shape. Unlike gases, a liquid will not change its volume to spread out and completely fill a container.

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Answer:

C

Explanation:

Hope This Helps :)

Answer:

A climograph is a graphical representation of the climate of a particular location over a period of time. It typically shows the average temperature and precipitation for a specific location over the course of a year, with the temperature plotted on the y-axis and the months of the year plotted on the x-axis.

The primary function of a climograph is to provide a visual representation of the climate of a particular location, which can be useful for understanding the weather patterns and temperature ranges that are typical for that location. Climographs can also be useful for comparing the climate of different locations, as they provide a convenient way to see how temperature and precipitation patterns differ from one place to another.

a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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9.14moles

According to the Avogadro's constant,

We are to determine the moles of 5.50 x 10^24 molecules of butane. This is expressed as:

Therefore the required mole of butane is 9.14moles

Answer:

21.8

Explanation:

add both because there both forces are going down

Both sand and potting soil are mixtures because they both contains more than one type of substances. Both are composed of minerals and different substrates.

Mixtures are substance formed by the combination of two or more components. The mixtures can be homogenous or heterogenous. Homogenous mixtures contains only one phase.

Heterogenous mixtures are of components with different phases. Sand is an example of heterogenous mixture. The major component of sand is silicon dioxide. it also contains grains of other minerals.

Potting soil is a mix of soil and minerals used for plantation. It also known as potting compost since it contains wood products, vermiculates, clay etc. Therefore, potting soil is a mixture.

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Answer:

replacement

Explanation:

There are two types of replacement reactions.

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AD +CB

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

The given reaction is double replacement reaction because anion and cation of both reactants exchanged with each other.

Other options are incorrect because,

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Answer:

On the periodic table? But if you are talking about atomic NUMBER-then thats the number of protons on the upper left side of the symbol , but if you are talking about the mass then on the bottom left.

Since you are in highschool it shall always be provided hence no need to memorize it, just know the first 20

The atomic symbol for elements can be found on the periodic table.

The elements in the periodic table are arranged according to their rising atomic number and recurrent chemical characteristics. They are arranged in a tabular format with rows representing periods and columns representing groups.

The sequence of the elements' ascending atomic numbers is left to right and top to bottom. Thus, The valence electron configuration of elements belonging to the same group will be the same, resulting in identical chemical characteristics.

In contrast, valence electrons in the same period will be arranged in ascending order. As a result, there are more energy sub-levels per energy level as the atom's energy level rises. The very first 94 elements of a periodic table are found naturally, whereas the last 95–118 elements have only been created artificially in labs or nuclear reactors.

The periodic table we currently use is a more advanced version of certain models proposed by scientists in the 19th and 20th centuries. Based on the discoveries of those scientists who came before him, like John Newlands and Antoine-Laurent de Lavoisier, Dimitri Mendeleev proposed the periodic table. The periodic table was created by Mendeleev, who is the only person to receive credit for it.

Therefore, the atomic symbol for the elements can be found on the periodic table

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The number of different wavelengths in the emission spectrum of this atom is three wavelengths.

The given diagram shows the energy level diagram of the four energy states of an atom. In the given diagram, the electron in the ground state makes a transition from the n = 2 energy level to the n = 4 energy level.As the electron makes a transition from the n = 4 energy level to the n = 2 energy level, the energy of the electron is emitted in the form of radiation.

The energy of the emitted radiation depends on the difference between the initial energy level and the final energy level. The energy of the emitted radiation is given by the following equation:

ΔE = Ei - Ef where, ΔE is the energy of the emitted radiation, Ei is the initial energy level, and Ef is the final energy level.

The emitted radiation has a specific wavelength, which is given by the following equation:λ = hc/ΔEwhere, λ is the wavelength of the radiation, h is the Planck's constant, c is the speed of light, and ΔE is the energy of the radiation. As we see from the given diagram, the electron makes three different transitions as follows:

From n = 4 to n = 2From n = 3 to n = 2From n = 4 to n = 3

Hence, there will be three different wavelengths in the emission spectrum of this atom.

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1. Cl2 + H2O → HOCl + HCl

2. Tooth decay starts when when the pH of the mouth is lower than 5.5. Tooth enamel is made up of calcium phosphate and it is one of the hardest substances of the body. But it is corroded when the pH is less than 5.5. The bacteria of our mouth produce acids by degradation of sugar and food particles remaining in our mouth after eating food.

3. Fluorine salts are added in toothpaste to protect our teeth from tooth decay. Fluorine salts are mildly basic, so they neutrelise the acid in our mouth that leads to tooth decay.

4. Tincture of iodine is iodine, pottasium iodide and sodium iodide dissolved in ethanol. Iodine acts in an antiseptic manner by destroying microbial proteins and DNA.

5. Tincture of iodine is clear and reddish brown liquid.

The temperature of the room water and the block will be the same. The energy being transferred from the block to the water is heat energy.

The hot metal block is dropped into another beaker of water having room temperature after being placed in the boiling water. The flow of energy from the higher-temperature matter to the lower-temperature matter is called heat.

Now, the heat is transferred from the metal block to the water which is at room temperature. After some time, the metal block will have a low temperature and the water will have a high temperature.

This process will be carried down until both objects will have the same temperature. It is known as thermal equilibrium. The heat transfer from the hot water to the normal or cold water through a metal block is said to be conduction.

Therefore, the energy that is being transferred from the metal block to the water is heat energy.

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Thymol blue is an acid-base indicator commonly used in chemistry experiments. It has two color transitions depending on the pH of the solution. Below pH 2.0, the indicator appears red, between pH 2.0 and 8.0 it appears yellow, and above pH 8.0 it appears blue.

The two color transitions occur at pH 2.0 and pH 8.0, respectively. The first color transition from red to yellow occurs as the solution becomes more basic, meaning there is an increase in hydroxide ion concentration and a decrease in hydrogen ion concentration. The second transition from yellow to blue occurs as the solution becomes even more basic, and the concentration of hydroxide ions increases even further. The color changes occur due to the structural changes in the indicator molecule as it reacts with hydrogen ions or hydroxide ions. This makes thymol blue a useful indicator for acid-base titrations and other experiments where the pH of a solution needs to be determined.

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Simplified formula

\(\\ \rm\Rrightarrow N_2H_8C_2O_4\)

Let's count atoms of all

In 1 mol of compound hydrogen is of

\(\\ \rm\Rrightarrow 8mols\)

Formula =>\( \sf N_2H_8C_2O_4\)

The coefficient for OH^(-)(aq) in the balanced equation is 7.

In a balanced chemical equation, the coefficients represent the relative amounts of each species involved in the reaction. To balance the given equation, H2O2(aq) + Cr2O7^2-(aq) → O2(g) + Cr3+(aq), in a basic aqueous solution, we need to account for the presence of hydroxide ions (OH^(-)(aq)).

To balance the equation in a basic solution, we follow these steps:

Step 1: Balance the atoms other than hydrogen and oxygen. In this case, we have one Cr atom on each side and two O atoms on the reactant side but three O atoms on the product side.

Cr2O7^2-(aq) + H2O2(aq) → O2(g) + 2Cr3+(aq)

Step 2: Balance the oxygen atoms by adding water (H2O) to the side that needs more oxygen. We add three H2O molecules to the left side to balance the oxygen atoms.

Cr2O7^2-(aq) + 3H2O2(aq) → O2(g) + 2Cr3+(aq)

Step 3: Balance the hydrogen atoms by adding H^+ ions to the opposite side. We add 8H^+ ions to the right side to balance the hydrogen atoms.

Cr2O7^2-(aq) + 3H2O2(aq) → O2(g) + 2Cr3+(aq) + 8H+(aq)

Step 4: Balance the charge by adding OH^(-)(aq) ions to the opposite side. We add 7OH^(-)(aq) ions to the left side to balance the charges.

Cr2O7^2-(aq) + 3H2O2(aq) + 7OH^-(aq) → O2(g) + 2Cr3+(aq) + 8H+(aq)

Therefore, the coefficient for OH^(-)(aq) in the balanced equation is 7.

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