Why is it the principle about the relationship between mass and volume always true of substance, but not always true of mixtures

When the concentrations of Ca2+ and F- are 0.002M and 0.004M, respectively, the solubility constant will be 3.2x [tex]10^{-8}[/tex].

The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated.

You can determine how much solute has been dissolved in the solvent by looking at the concentration of the solution. For instance, the concentration could be stated as 1 teaspoon of salt per 2 cups of water if you add 1 teaspoon to 2 cups of water.

Given that,CaF2(s) <==> Ca 2+(aq) + 2F- (aq)

Solubility constant(Ksp) is written as

Ksp = [tex][Ca^{2+} ][F-]^{2}[/tex]

Ksp = [tex][0.002][0.0004]^{2}[/tex]

Ksp = 3.2x[tex]10^{-8}[/tex]

So, the Solubility constant is 3.2x[tex]10^{-8}[/tex].

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Volume of the sample of neon gas is 8.48L

Volume can be calculated by multiplying mole of gas with molar gas volume and the neon gas is the inert gas which is present in group 18 of the periodic table used in electric sign and florecent lamp

Here given data is 0.379 mol of neon gas at STP

Formula to calculate volume

Volume = n×Vm

Where n = number of moles

Vm = molar gas of volume at STP

Put the given value in the formula then

V =  0.379 mol × 22.4L/mol

V = 8.48L

Volume of the sample of neon gas is 8.48L

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The calculated concentration of the acetic acid neutralized is 0.134 M.

In this case, the task that we have is to obtain by calculation what would be the concentration of the acetic acid that is need to neutralize  0.1098M of sodium hydroxide solution.

Given that;

Total volume of the vinegar = 5 ml + 25 mL = 30 mL

Molarity of the sodium hydroxide =  0.1098M

Volume used for neutralization = 37.83ml -  1.35 ml = 36.48 mL

Applying the relation;

CAVA/CVB = NA/VB

CAVANB = CBVBNA

CA= CBVBNA/VANB

CA = 0.1098 * 36.48  * 1/30 * 1

CA = 0.134 M

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Answer:

C. Strong nuclear force.

Explanation:

First, let's review the definitions of the given concepts of the group of answer choices:

- Electrostatic force: It's the interaction that occurs between electrically charged particles (positive and negative charges).

- Force of gravity: is a fundamental interaction where there is a mutual attraction between all things that have mass or energy.

- Strong nuclear force: is what keeps nuclei together (protons and neutrons together).

- Weak nuclear force: this force is responsible for particle decay.

Based on these definitions, the force that holds the nucleus together would be C. Strong nuclear force.

We can see from that the limiting reactant from the question is carbon.

The limiting reactant is the reactant that would determine when the reaction would stop. This is so because that reactant is present in the least amount in the system.

Given that;

Number of moles of carbon = 20.0g/ 12.01 g/mol = 1.67 moles

Number of moles of hydrogen =  20.0g/2.02 g/mol = 9.9 moles

Given that 2 moles of carbon reacts with 3 moles of hydrogen

1.67 moles of carbon reacts with;  1.67 moles  * 3 moles / 2 moles

= 2.51 moles

Hence the limiting reactant is carbon.

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The equation of the enthalpy of the formation of water is:

H₂O (g) + ¹/₂ O₂ (g)----> H₂O (g)

The enthalpy change for the formation of water refers to the heat changes that occur when a mole of water is formed from its constituent elements.

The equation for the formation of water is given below:

2 H₂O (g) + O₂ (g)----> 2 H₂O (g)

The enthalpy of the formation of water, ΔHf, is -249 kJ.

A water molecule s formed from the hydrogen gas and oxygen gas reacting with a mole ratio of 2 : 1.

The reaction of the formation of water is an exothermic reaction, hence, the enthalpy of the formation of water, ΔHf, has a negative value.

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The statement comparative investigations do not require a hypothesis is False because we need to test this assumption (Option B).

A scientific hypothesis is an explanation about a given question that emerges by observing characteristics of the real world, which is tested (either confirmed or rejected) by the use of the scientific method.

Therefore, with this data, we can see that a scientific hypothesis is a given explanation about different questions that need to be confirmed by the scientific method, which may involve experimentation and or observation procedures.

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Because we need to evaluate this assumption, the claim that comparative investigations do not require a hypothesis is false.

A scientific hypothesis is defined as an explanation for a particular question that arises from observing features of the real world and is put to the test via the scientific process. It can either be verified or rejected.

With the use of this information, we can see that a scientific hypothesis is a predetermined answer for a range of issues that has to be verified through the scientific method, which may entail experiments or other methods of observation.

Thus, because we need to evaluate this assumption, the claim that comparative investigations do not require a hypothesis is false.

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A 3.75 g piece of gold, initially at 587.15 K, is dropped into 20.6 mL of 295.75 K water. The final temperature is 291.4 K.

Temperature is defined as a measure of hotness or coldness expressed on any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow that is, from a hotter to a colder body.

To calculate the final temperature

ΔT = T1 - T2

Where T1 = 587.15 K

           T2 = 295.75 K

ΔT = 587.15 - 295.75

ΔT = 291.4 K

Heat capacity of gold is

q = mcΔT

q = 3.75 x 0.129 x 291.4

q = 140.96 J

Thus, a 3.75 g piece of gold, initially at 587.15 K, is dropped into 20.6 mL of 295.75 K water. The final temperature is 291.4 K.

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      We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.

We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.

   Using the literary device of personification to create relatable characters for industry (as the Once-ler), the environment (as the Truffula trees), and environmental activism, the tale is widely regarded as a fable on the danger of avarice causing human damage of the natural environment.

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To verify if an equation is balanced, you have the count each one of the present atoms on both sides of it. Let's count on each one of the options until finding the one that's balanced:

A.

The Ag and the K are not balanced.

B.

It means that this equation is balanced.

The answer is B.

According to the explanation given in a previous session, now we have to use the same molarity formula to find the number of moles of CaCl2, let's set up the formula and add the values:

M = n/V

4.9 = n/0.750

n = 4.9*0.750

n = 3.675 moles of CaCl2

Now to find the mass in grams, we need both the number of moles, 3.675 moles, and also the molar mass of CaCl2, which is, 110.98g/mol

110.98g = 1 mol

x grams = 3.675 moles

x = 407.85 grams of CaCl2

ANSWER

STEP-BY-BY STEP EXPLANATION:

Given equation

To balance the above equation, we will need to apply the law of conservation of mass

The next process is to assign variables to each of the reactants and products

For carbon

we have 1 carbon atom at the reactant side and 1 carbon atom on the product side

Mathematically

a = c

For Fluorine

We have 4 atoms of fluorine at the reactant side and 2 atoms of fluorine at the product side

4a = 2d

For Bromine

we have 2 atoms of bromine on the reactant side and 4 bromine atoms on the product side.

2b = 4c

Since a = c

Therefore, a = 1 and c = 1

2b = 4c

Recall that, c = 1

2b = 4

Divide both sides by 2

2b/2 = 4/2

b = 2

we also know that, 4a = 2d

a = 1

4(1) = 2d

4 = 2d

Divide both sides by 2

4/2 = 2d/2

d = 2

Therefore,

a = 1

b = 2

c = 1

d = 2

   The ability to exert a force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things.

   Following is the order of energy needed for excitation of various transitions. Transition n* uses the least energy, whereas transition * uses the most energy. Since the n* transition has a larger wavelength, it takes the least energy.

      A periodic table can be used to predict electron configurations. The least energetic and most stable configuration is the ground state configuration. A higher energy configuration is called an excited state configuration (it requires energy input to create an excited state). The electrons used in bonds are valence electrons.

     An electron receives and releases energy in the form of light energy during transition. The energy change E Delta E E of the electron is equal to the energy of the photon E E E absorbed/released during the transition.

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The actual theoretical and the ratio is [tex]\frac{NH3}{O_{2} }[/tex], therefore the limiting reagent is    [tex]O_{2}[/tex]I is 0.8.

Convert the mass to moles:

40.0 grams of NH3 / 17.03 g/mol = 2.35 moles NH3

50.0 grams of O2 / 31.998 g/mol = 1.56 moles O2

Get the actual ratio:

NH3/O2 = 2.35 / 1.56 = 1.5

The theoretical ratio is 4 NH3 to 5 O2, that is:

(NH3/O2)theo = 4 / 5 = 0.8

Limiting reagents are substances that are completely consumed at the end of a chemical reaction. They are also called limiting agents or limiting precursors. According to the stoichiometry of chemical reactions, a certain amount of reactants is needed to complete the reaction. Consider the following reaction for the formation of ammonia:

3H2 N2 → 2NH3

In the above reaction, 3 moles of hydrogen gas are required to react with 1 mole of nitrogen gas to form 2 moles of ammonia. But what if only 2 moles of hydrogen gas are available for 1 mole of nitrogen during the reaction?

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Answer:

Explanation:

Here, we want to get the mass of carbon (iv) oxide produced

We start by writing the equation of reaction as follows:

Now, we need to get the mass of propane that reacted

We can get that by multiplying the density of propane by its given volume

Mathematically, we have that as:

From here, we get the actual number of moles of propane that reacted

We can get that by dividing the mass by the molar mass of propane

The molar mass of propane is 44 g/mol

The number of moles is thus:

From the balanced equation:

1 mole of propane gave 3 moles of carbon (iv) oxide

104/44 mol will give x moles

We have the value of x as:

To get the mass of carbon (iv) oxide produced, we multiply the number of moles above by the molar mass of carbon (iv) oxide

The molar mass of carbon (iv) oxide is 44 g/mol

Thus, we have the mass as:

From the images, the gas 2 has a greater pressure compared to gas 1 because it has more particles that are colliding.

The term pressure of a gas refers to the force with which the gas hits the walls of the container. We know that the pressure of the gas depends on the number of the molecules of the gas. According to one of the gas law, the pressure of the gas is directly proportional to the number of moles of the gas.

We now have to look at the image properly. It is clear that the image that is on the right hand side has more gas molecules thus it has a greater pressure compared to the gas on the left hand side.

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The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

The law of conservation of mass states that in a chemical reaction the mass neither be created nor be destroyed.

for example :

CH₄   +    2O₂    ----->    CO₂   +   2H₂O

the mass of reactants is = 16 g + 64 g = 80 g

the mass of products is = 44 g + 36 g = 80 g

it is clear from the above that :

The mass of reactants = The mass of Products

Thus , The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

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Answer: 1 mL = 1 cm^3

Explanation:

This is a common conversion, 1 mL equals 1 cm^3. They are the same volume.

Decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.

As we know that rate of reaction is directly proportional to the concentration of the reactant.

If we increase the concentration of H2 then the rate of reaction increases. So, we keep it constant. Therefore this option is wrong.

By removing the H₂O from the reaction vessel as it almost make no change in the reaction. This can be pursuited the reaction in which product again converted into product.

By increasing the temperature we increases the rate of reaction and equilibrium shift in the forward direction.

Thus, we concluded that by decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.

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The electromagnetic spectrum shown in the diagram is describing radiant energy.

The electromagnetic spectrum shows the total range of frequencies or wavelengths that electromagnetic radiation covers or occurs.

The electromagnetic spectrum usually arranges all forms of electromagnetic radiation from that having the shortest wavelength or highest frequency to that having the longest wavelength or lowest frequency or vice versa.

The electromagnetic spectrum shown arranges electromagnetic radiation from gamma rays to radio waves.

All forms of electromagnetic radiation possess radiant energy.

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The element that can bond with titanium (Ti) in order to form a polar covalent bond is nitrogen (abbreviated as N).

A covalent bond is a type of chemical bond in which two different atoms interact due to differential electronegative charges. A polar covalent bond is formed in the case that differential electronegativity between atoms that may share negatively charged electrons through a covalent bond.

In consequence, a polar covalent bond is a special class of covalent bond where atoms show an unequal distribution in the covalent bond.

Therefore, with this data, we can see that polar covalent bonds represent a special class of covalent bonds where the atoms form a bond but they are distributed in an equal way, which occurs between titanium and nitrogen due to their electronegative charges and therefore unequal distribution of these charges.

Complete question:

Which element can bond with titanium (Ti) to form a polar covalent bond?A.

beryllium (Be)

B.

fluorine (F).

C.

manganese (Mn)

D.

nitrogen (N)

E.

oxygen (0)

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Answer

Explanation

Given:

Mass of iron (III) oxide sample = 74 g

What to find:

The amount (mole) of iron (III) oxide in a 74 g sample.

Solution:

The amount (mole) of iron (III) oxide in a 74 g sample can be calculated using the mole formula.

Using the molar masses of Fe = 55.845 g/mol, and O = 15.999 g/mol.

The molar mass of Fe2O3 = (2 x 55.845) + (3 x 15.999) = 159.687 g/mol

Putting mass = 74 g and molar mass = 159.687 g/mol, the amount will be

Therefore, the amount of iron (III) oxide in a 74 g sample is approximately 0.46 moles.

The percent of copper in solution is 39.8% when a solution contains copper and suphate.

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Explanation:

The reaction between potassium (K) and bromine (Br2) produces potassium bromide (KBr).

K + Br2 --> KBr

Now we need to balance the equation. For this, we need to equate the atoms of each element on both sides of the equation.

So in the reactants side:

K - 1

Br - 2

Products side:

K - 1

Br - 1

Let's multiply KBr by 2:

K(s) + Br2 → 2KBr(s)

Now we need to balance K:

2K(s) + Br2 → 2KBr(s)

Let's count again:

Reactants side:

K - 2

Br - 2

Product side:

K - 2

Br - 2

2K(S) + Br2 → 2KBr(S)

Answer: 2K(s) + Br2 → 2KBr(s)

High power objectives according to its function is that it is Magnifying because it makes the specimen viewed bigger. That is option D.

Microscope is defined as a laboratory instrument that has the ability to magnify objects placed before it which an ordinary eye can not observe.

There are various type of microscope which include the following:

The microscope makes use of its various lens to magnify the object that is placed before it. The various power of objectives include:

Therefore, according to the function of a high power objectives, it makes images appear bigger and magnified.

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The energy that is provided by the spark of the match is called the activation energy.

The term activation energy is the energy that is required for a reaction to start up. We know that a spontaneous reaction refers to the type of reaction that is able to proceed on its own once it has started. It does not require a continuous supply of energy to proceed.

In this case, the energy that is required to start off the reaction is the activation energy ad that is what is provided by the match that sparks.

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The answer to this question depends on the specific context in which urban and industrial development is taking place. However, in general, these sectors often practice improper and mismanaged sewage systems due to a lack of understanding or awareness of the potential environmental impacts of their activities.

Urban and Industrial development:
An agrarian economy becomes a manufacturing economy through the process of industrialization. Manual and specialised employees are replaced by assembly lines and mass production. In the past, this process has sparked urbanisation by generating economic expansion and employment possibilities that entice people to live in cities.

When one or more factories are built in an area, urbanisation usually starts since there is a great need for factory workers. The factories are subsequently followed by other enterprises, like those that produce buildings, sell goods online, and offer services to consumers. As a result, there are more occupations created and housing needs are increased, creating an urban area.

In many cases, engineers and other technical professionals are present in these sectors but are not consulted or involved in the decision-making process regarding sewage systems. This can lead to a situation in which the systems are not designed or operated in an environmentally sustainable manner.

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The equilibrium expression of the given chemical equation Kc =

[tex]\frac{(CaCO_{3} ) (H_{2} )^{4} }{(CaO) (CH_{4} ) (H_{2} O)^{2} }[/tex]

Equilibrium expression of a chemical equation is defined as the equations equilibrium constant which is the rate constant for the forward reaction divided by the rate constant for the reverse reaction.

The equilibrium expression (Kc)of a chemical equation can be written using the following formula:

KC= [C] [D].../[A] [B] ...

Therefore to show the equilibrium expression of the following equation:

Kc = [tex]CaO + CH_{4} + 2H_{2} O --- > CaCO_{3} + 4H_{2}[/tex]

kc = [tex]\frac{(CaCO_{3} ) (H_{2} )^{4} }{(CaO) (CH_{4} ) (H_{2} O)^{2} }[/tex]

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In the subsequent reaction, 12 electrons are transported. 3O2(g) + B2H6(g) = B2O3(s) + 3H2O(l).

Oxidation and reduction occur simultaneously in this kind of chemical reaction. Electrons are lost or gained during oxidation and reduction, respectively. Example: The interaction between copper and zinc.

Give each atom its its oxidation number.

2. Compare the product side's and reactant side's oxidation numbers.

3. Two elements' oxidation numbers in a redox reaction shift from the reactant side to the product side.

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