A chemistry teacher mixes two clear substances together and notices a solid forming at the bottom of the beaker. Is the teacher demonstrating a physical or chemical change?.

The concentration of sodium ions in the final solution is 0.94 M.

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

Calculation:-

C₁ = 0.5010

V₁ = 17.5 ml = 0.0175 L

C₂ = 1.1250

V₂ = 46 ml = 0.046 L

C₁V₁ + C₂V₂ = C × total volume

0.5010  × 0.0175 + 1.1250 × 0.046 = C × 0.0635 L

C = 0.0077 + 0.052 / 0.0635 L

   = 0.94 M

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of solution.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The molarity of the given solution will be 2.356 moles/ litre

We knw that molarity can be calculated using the formula,

Molarity= No of moles of solutes / Volume of solution in Litres

Molarity= (mass/molar mass)/ Volume of solution in Litres

We divide the number of moles of solute by the total volume of liters of solution to determine the molarity of a solution.

When the solute's volume is specified in grams, we must first determine how many moles there are of the solute.

By dividing by the solute's molecular mass, we may compute the number of moles of solute. The result is molarity when it is divided by total volume.

By determining the number of moles of solute using the same method as previously, the volume of a specific mass in a given gram of solution can also be computed. then divided by the specified molarity to determine the solution's total volume.

Given,

Mass (m)= 34.5 g

Molar mass of NaCl= 35.5 + 23= 58.5

Volume of solution= 250 mL= 0.25 L

M= (34.5/ 58.5)/ 0.25

M= 2.356 moles/ Litre

So, the molarity of the solution having mass 34.5 g of solute and 250mL volume will be 2.356 moles/ litres.

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Answer:

• Absorption changes the state of a particle from its original state to a higher state.

• Emission makes a particle go from a high energy state to a lower one.

• In the Transmission the wave passes from one medium to another.

• In the Reflection the wave changes direction when it collides with a different medium.

Explanation:

- Difference between absorption and emission:

Absorption and emission are related to electromagnetic radiation. The difference is that the Absorption of electromagnetic radiation changes the state of a particle (for example, an atom), from its original state to a higher state. While the Emission of electromagnetic radiation makes a particle with high energy content go from a high energy state to a lower one, in this case, the particle releases energy in the form of a photon.

- Difference between transmission and reflection:

Transmission and reflection are ways in which a wave moves. The difference is that in the Transmission the wave passes from one medium to another and in the Reflection the wave changes direction when it collides with a different medium.

The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.

given that :

volume of solute = 15 mL

volume of solution = 200 mL

percent volume (v/v)% = (volume of solute/ volume of solution) × 100 %

percent volume (v/v)% = (15 mL / 200 mL ) × 100 %

percent volume (v/v)%  = 0.075 × 100 %

percent volume (v/v)%  = 7.5 % v/v.

Thus, The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.

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Answer:

can hydrogen be used to make oxygen? and how do you know?

Explanation: yes because H1 is water

Answer:

see the answer

Explanation:

Yes hydrogen can be used to make oxygen

because H1 is water

INFORMATION:

We have the next options:

A) Oxidation is the non-spontaneous loss of electrons

B) Oxidation is the spontaneous loss of electrons

C) Oxidation is the gain of electrons

D) Oxidation is the loss of electrons

And we must select the one that best describes an oxidation process

STEP BY STEP EXPLANATION:

Oxidation process consists in the loss of electrons during a reaction.

An older meaning of oxidation was when oxygen was added to a compound. This was because oxygen gas (O2) was the first known oxidizing agent. While the addition of oxygen to a compound typically meets the criteria of electron loss and an increase in the oxidation state, the definition of oxidation was expanded to include other types of chemical reactions.

Finally, knowing that, we can state that, in general, Oxidation is the loss of electrons.

ANSWER:

D) Oxidation is the loss of electrons

Answer

Volume of O2 = 1326 L

Explanation

Given:

2C8H18(I) + 25 O2 (g) = 16 CO2(g) + 18 H2O (g)

moles of gasoline = 4.00 mol

Pressure = 0.953 atm

Temperature = 35 C = 308 K

Required: volume of oxygen

Solution

Step 1: use stoichiometry to find the moles of oxygen

The molar ratio between gasoline and O2 is 2:25

Therefore the moles of o2 = 4.0 mol x (25/2) = 50.0 mol

Step 2: Calculate the volume using ideal gas law

PV = nRT

V = nRT/P

V = (50.0 x 0,08206 x 308)/0.953

V = 1326 L

Iodine-131 (I-131) is used in the treatment of thyroid cancer it undergoes beta decay and has a half-life of 8 days if we start with 115 grams of I-131 then we have after 40 hours is 0.058g

Iodine-131 is the radioactive isotope of iodine with the atomic mass 131 and it is used for the treatment of thyroid cancer

Here given data is

half-life = 8 days

15 grams of I-131

We have to calculate after 40 hours = ?

So, m = M/2ⁿ

Then m = 15 grams/2⁸

m = 15 grams/256

m = 0.058g

Therefore If we start with 115 grams of I-131 then 0.058g will we have after 40 hours

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Answer:The  concentration of the original NAOH solution is 0.242 M.

Explanation:

We know that for neutralization reaction   the no. of mole of H+ ions from the acid must be equal to that of those of OH- ions released from base.

Since both HBR and NAOH are monobasic and monoacidic respectively  we can use the formula

No. of milimoles of H+ = No. of milimoles of OH-   ( Note – as both the volumes are given in ml so take milimoles)

Or; MV(HBR)=MV(NAOH)

24.2x0.2=20xM(NAOH)

Or; Molarity =0.242M.

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Answer

A reaction generally can be made to go more quickly by:

B. Adding a catalyst

C. Lowering the activation energy

D. Shaking the reactants

Explanation

The presence of a catalyst increases the rate of a reaction by lowering its activation energy. Chemical reactions occur when molecules collide with each other and undergo a chemical transformation.

Stirring and shaking provide some kinetic energy to the system. It increases slightly its temperature and the reaction rate. increasing the kinetic energy of reactant particles also means more of the reactant particles will have the minimum amount of energy required to form products (ie, activation energy) which leads to more successful collisions and therefore increases the reaction rate.

Answer:

An atom of Sulfur

Explanation:

i did a Quick search and im trying to get pass the "help a person first"

Answer:

• A collection of atoms of Sulfur

Explanation:

I'll assume the notation is written as [tex]S_{8}[/tex].  A subscript after an element symbol represent the number of individual atoms of the symbol.  In this case [tex]S_{8}[/tex] is telling us we have 8 sulfur atoms that are somehow connected to each other.  That is in contrast with 8S, which means we have 8 different sulfur atoms.  A chemical formaula, such as [tex]CH_{4}[/tex] tells us we have a molecule containing 1 carbon atom and 4 hydrogen atoms.

Answer:

Mixture

Explanation:

Mixture are simply a physical combination of two or more substances. they can be separated based only by physical means, or by undergoing physical changes.

Answer:

Pretty sure its Tilted

Explanation:

Answer: Tilted

Explanation:

Salt.

Acids and bases, when brought together, form salt and water through a process known as neutralization process. Since NaCl, the salt, is of majority use in the body, the answer to this question is salt.

Answer:

cation - electron loss hence positive charge

anion - electron gain hence negative charge

The given terms are correctly paired thus: anion is to electron gain while cation is to electron loss.

Ionic bond formation is defined as the formation of an ionic bond during a chemical reaction whereby an atom losses electrons while another gains electrons through transfer of these electrons.

For example in the formation of the compound NaCl. Sodium is the element that donates an electron from its outermost shell to chloride. Therefore, the sodium atom is the cation.

Also the chloride element would accept electron from the sodium, therefore, it is called the anion.

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Answer

A. Decomposition.

Explanation

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

It is to be noted that there are no p orbitals accessible for multiple bonding in an sp3 hybrid. The two unhybridized p orbitals are accessible for multiple bonding in sp hybridization.

Bonds are formed using unhybridized p atomic orbitals. Two unhybridized p atomic orbitals from distinct atoms overlap side by side, resulting in a shared electron pair filling the area above and below the connecting line between the atoms (the internuclear axis).

An atom will contain the same amount of hybridized orbitals as electron density areas. There can be a total of four hybridized sp3 orbitals, thus take the number of regions of electron density and divide that by four to get the number of unhybridized p orbitals.

An atomic orbital is a function in atomic theory and quantum mechanics that describes the position and wave-like behavior of an electron in an atom. This formula may be used to determine the likelihood of locating any atom's electron in any given location surrounding the nucleus.

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The number of moles of moles of acid neutralized by the antacid tablet and the mass of the active ingredient required are,0.252055 moles and  25.2 g respectively.

First, we need to calculate the moles of HCI that were added. This is simple to do, we just need to use the formula  

moles=MxV  

where M is the molarity (concentration) of the acid and V is the volume in liters. Since we have the concentration in molarity and the volume in mL, we need to convert the volume to liters. We can do this by dividing the volume in mL by 1000. This gives us the following equation:  

moles=Mx(V/1000)  

Plugging in our values, we get  

moles=(1.0755)x(25.00/1000)  

moles=0.26889  

Now that we know the moles of HCI that were added, we can calculate the moles of acid that were neutralized by the antacid tablet. To do this, we need to use the balanced chemical equation for the reaction.  

2HCI (aq) + CaCO₃ (s)→ CaCl₂ (aq) + CO₂ (g) + H₂O (l)

We can see from the equation that for every mole of HCI that is neutralized, one mole of CaCO₃ is used up. This means that the number of moles of HCI that were neutralized is equal to the number of moles of CaCO₃ that were used up.

Since we know the number of moles of HCI that were added (from the previous calculation), we can just subtract this from the number of moles of HCI that were left after the reaction (which is equal to the number of moles of NaOH that were used in the titration).

To calculate the number of moles of NaOH that were used, we just need to use the formula  

moles=MxV

where M is the molarity (concentration) of the NaOH and V is the volume in liters. Since we have the concentration in molarity and the volume in mL, we need to convert the volume to liters. We can do this by dividing the volume in mL by 1000. This gives us the following equation:  moles=Mx(V/1000)  

Plugging in our values, we get  

moles=(1.0031)x(16.80/1000)  

moles=0.0168352  

Now that we know the number of moles of HCI that were added and the number of moles of NaOH that were used, we can calculate the number of moles of HCI that were neutralized by the antacid tablet.

We do this by subtracting the number of moles of NaOH from the number of moles of HCI. This gives us the following equation:  

moles of HCI neutralized= moles HCI added− moles NaOH used  

Plugging in our values, we get  

moles HCI neutralized= (0.26889)−(0.0168352)  

moles HCI neutralized= 0.252055  

This means that the antacid tablet neutralized 0.252055 moles of HCI.

Now that we know the number of moles of HCI that were neutralized, we can calculate the mass of the active ingredient required.

To do this, we need to use the balanced chemical equation for the reaction.  

2 HCI (aq) + CaCO₃, (s)→ CaCl₂ (aq) + CO₂ (g) + H₂O (l)  

We can see from the equation that for every mole of HCI that is neutralized, one mole of CaCO₂ is used up.

This means that the mass of the active ingredient required is equal to the number of moles of HCI that were neutralized multiplied by the molar mass of CaCO₃.

The molar mass of CaCO₃ is 100.09 g/mol. This gives us the following equation:  

mass = moles x molar mass  

where mass is the mass of the active ingredient required, moles is the number of moles of HCI that were neutralized, and molar mass is the molar mass of CaCO₃. Plugging in our values, we get  

mass=(0.252055)x(100.09)  

mass=25.2 g

This means that the active ingredient in the antacid tablet must have a mass of at least 25.2 g in order to completely neutralize the acid.

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Answer

In summary

A number of properties of liquids, such as cohesion and adhesion, are influenced by the intermolecular forces within the liquid itself. Cohesion are various intermolecular forces that hold solids and liquids together while adhesion is the ability of a liquids to stick to an unlike substance. The rise or fall of a liquid in a capillary tube is governed by the balance of cohesive and adhesive forces. Lastly, surface tension is a fundamental property of the surface of liquid, it is responsible for the curvature of the surfaces of liquids dues to the polarity that exists in the liquid molecules.

Explanation

Liquids flow because the intermolecular forces between molecules are weak enough to allow the molecules to move around relative to one another. The forces are attractive when a negative charge interacts with a nearby positive charge and repulsive when the neighboring charges are the same, either both positive or both negative. Molecules are held together by polar covalent bonds – which means that the electrons are not evenly distributed between the bonded atoms. This uneven distribution in the covalent bonds of the molecules results in a partial charge.

The liquid molecules don’t interact particularly strongly with each other because the intermolecular forces are weak. The primary intermolecular forces – are London dispersion forces, which for small molecules are the weakest types of intermolecular forces. These weak forces lead to low cohesion. The molecules don’t interact strongly with each other, so they can slide right past one another.

Adhesion is the tendency of a compound to interact with another compound. (Remember that, in contrast, cohesion is the tendency of a compound to interact with itself.) Adhesion helps explain how liquids interact with their containers and with other liquids. One example of an interaction with high adhesion is that between water and glass. Both water and glass are held together by polar bonds. Therefore, the two materials can also form favorable polar interactions with each other, leading to high adhesion.

The melting point of a substance can be predicted by comparing the relative strength of their intermolecular forces.

This is referred to as the temperature in which a substance changes state from solid to liquid and an example is the temperature in which ice turns to liquid water. Temperature on the other hand is the degree of hotness or coldness of a substance or body.

Intermolecular forces are the forces which mediates interaction between molecules and studies has shown that the stronger the intermolecular bonds the greater the melting temperature of the substance and vice versa thereby making ways to predict it.

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Look around the room and find something properties are size shape and texture

Object around us are all kind of object and thus identifying them is important and all these differ from one another by some properties and every object we use is made to fulfil some purpose for us and object have properties that can observed and described are size and shape and texture and every object posses a different kind of texture and object of the same shape are classified into one group and object having the same shape are therefore classified into one object cluster

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Intermolecular force is present for Ne to form a liquid at low temperatures is London dispersion forces.

The hydrogen bond is present between the Hydrogen atom to the N, O, F. The dipole - dipole interaction forces are present in between two polar molecules. ionic bonds exists between two ions, that are positively charged . one is positively charged another one is negatively charged. neon exist as diatomic gas. so, the neon is a non polar .S, neon diatomic atom is present without forming any chemical bond with another atom. so., from the given option in the ques it is clear that the force between the neon atom is present as London dispersion force.

Thus, Intermolecular force is present for Ne to form a liquid at low temperatures isa) London dispersion forces.

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Newton’s Law .Use your knowledge of Newton’s Laws to complete the calculations. 1) F = 0.98 N 2) F = 3.9 N 3) F = 6.86 N 4) F = 10.78 N 5) F = 24.5 N 6) F = 49 N 7) F = 80.36 N.

Newton's law : F = ma

where, F = force

m = mass

a = acceleration due to gravity = 9.8 m/s²

1) mass = 0.10 kg ,

F = ma

F = 0.10 kg ×  9.8 m/s²

F = 0.98 N

2) mass = 0.40 kg

F = ma

F = 0.40 kg ×  9.8 m/s²

F = 3.9 N

3) mass = 0.70 kg

F = ma

F =  0.70 kg ×  9.8 m/s²

F = 6.86 N

4) mass = 1.1 kg

F = ma

F = 1.1 kg ×  9.8 m/s²

F = 10.78 N

5) mass = 2.5 kg

F = ma

F = 2.5 kg ×  9.8 m/s²

F = 24.5 N

6) mass = 5.0 kg

F = ma

F = 5.0 kg ×  9.8 m/s²

F = 49 N

7) mass = 8.2 kg

F = ma

F = 8.2 kg ×  9.8 m/s²

F = 80.36 N

Thus, Newton’s Law .Use your knowledge of Newton’s Laws to complete the calculations. 1) F = 0.98 N 2) F = 3.9 N 3) F = 6.86 N 4) F = 10.78 N 5) F = 24.5 N 6) F = 49 N 7) F = 80.36 N.

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Electrolysis occur when an electric current is passed through a liquid or solution thereby causing the decomposition of chemicals.

For magnesium chloride, it will be heated to be able to conduct electricity. When molten, the MgCl2 will decomposes into Mg2+ and 2Cl- ions. During electrolysis, the elements are separated according to the equations;

According to the half reactions, the Mg2+ is reduced at the cathode (-) and the Cl- is oxidized at the anode (+). Reduction at the cathode shows that magnesium gains two electrons to form a magnesium solid while the chlorine ion looses two electrons at the anode

In the reaction H₂ + I₂ --> 2HI, the iodine undergoes reduction.

The balanced reaction as:

H₂ + I₂ --> 2HI

The oxidation state of  hydrogen is increases from  0 to + 1

The oxidation state of iodine is decreases from  0 to -1

The increase in oxidation number is called oxidation. The decrease in oxidation number is called as reduction . the loss of electrons is called as oxidation and the gain of electron is called as reduction

oxidation = hydrogen , reducing agent = hydrogen

reduction = oxygen , oxidizing agent = oxygen

Thus, In the reaction H₂ + I₂ --> 2HI, the iodine undergoes reduction.

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This is a perfect answer

ω

The correct answer is 16 that is the element Phosphorous has 16 neutrons.

The neutron is known as a subatomic particle that is slightly heavier than a proton and has a neutral charge (one that is neither positive nor negative). Atomic nuclei consist of both protons as well as neutrons.

Protons and neutrons both are referred to as "nucleons" because of how similarly they function inside the nucleus and because they both have masses that are about equal to one atomic mass unit.

Nuclear physics explains their interactions and characteristics. Each proton and neutron is made up of three quarks, hence they are not fundamental particles.

The arrangement of electrons around an atom's heavy nucleus mostlydetermines its chemical characteristics. The atomic number, or we can say number of protons, which determines the charge of the nucleus, determines the electron configuration.

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When a chemical reaction results in a substance feeling cold, it is taking heat from the hand indicating it is as endothermic reaction.

"Heat is absorbed when chemical bonds are broken and released when chemical bonds are created.

Any chemical process that takes heat from its surroundings is said to be endothermic. The reaction's activation energy comes from the energy that was absorbed. This kind of reaction is characterized by its icy sensation. This may involve absorbing heat from your fingertips or the container they are in. As a result, the container and your fingers will both feel chilly.

1. Heat energy absorption is linked to these reactions.

2. The reactants' enthalpy is higher than the products' enthalpy.

3. The reaction's enthalpy is positive.

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When the seafloor spreads Basalt cools to form a new crust near the mid ocean rift.

Seafloor spreads means the separation of seafloor. Tectonic plate and the large plate of the lithosphere will split apart from the each other. This process occurs at the mid ocean ridges and . seafloor spreading leads to  dangerous things like rising sea level and earthquake . the cause for the seafloor spreading is ocean floors ruggedness. hot magma cooled to form igneous rock. this Basalt (the rock ) cools to form a new crust near the mid ocean rift.

Thus, When the seafloor spreads Basalt cools to form a new crust near the mid ocean rift.

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