4.How many grams of NaCl would need to be added to 1001 g of water to increase the boiling temperature of the solution by 1.500 °C? (Kb for water is 0.5100 °C/m)


5. A solution is made using 80.1 g of toluene (MM = 92.13 g/mol) and 80.0 g of benzene (MM = 78.11 g/mol). What is the molality of the toluene in the solution?

Answer:

The correct term for the definition is Allele.

Answer:

1) 3-methylpentane   2)Butyne

Explanation:

On the first molecule, we have a methyl group on the 3rd carbon, so you will have "3-methhyl". It's a 5 carbon molecule with no double bonds, so "-pentane" is required.

On the second molecule, we have a simple 4 carbon molecule with a triple bond which makes it an Alkyne. 4 carbons makes the prefix "but-" and a alkyne males the ending "-yne".

Answer:

C. The amount of solute that will dissolve in a given amount of solvent.

Explanation:

Solubility is the amount of solute that will dissolve in a given amount of solvent. Option 3 is correct.

A solution is a homogeneous mixture of two or more substances, where the substances are uniformly distributed throughout the mixture.

Therefore, the amount of solute that will dissolve in a given amount of solvent is referred to as solubility. The correct answer is option 3.

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Answer:

11.427L

Explanation:

From the ideal gas law,

PV=nRT

Where;

P=pressure of the gas

V=volume of the gas occupied by the container

n=number of moles of the gas

R=the ideal gas constant=0.0821atmL/mol/K

Given

P=4.258atm

V=?

n=2.0801mol

T=284.92K

From the equation

PV=nRT,

We will make V subject of formula

V=nRT/P

Let's now substitute the values

V=(2.0801×0.0821×284.92)/4.258

V=11.427L

Therefore, the volume of the container is 11.427L

Answer:

11.41L

Explanation:

Data obtained from the question include:

n (number of mole of Br2) = 2.0801 mol

P (pressure) = 4.258 atm

T (temperature) = 284.92K

R (gas constant) = 0.082atm.L/Kmol

V (volume of the container) =?

Applying the ideal gas equation PV = nRT, the volume of the container can be obtained as follow:

PV = nRT

4.258 x V = 2.0801x0.082x284.92

Divide both side by 4.258

V = (2.0801x0.082x284.92)/4.258

V = 11.41L

Therefore, the volume of the container is 11.41L

Answer:

27.03 g/mol

Explanation:

Molar Mass of HCN

Mass of Hydrogen : 1.008

Mass of Carbon: 12.01

Mass of Nitrogen: 14.01

Molar Mass of HCN =

1.008 + 12.01 + 14.01=

27.03 g/mol

Answer:

B. liquid to gas

Explanation:

Matter exists in 3 different states:

- Solid: in solids, particles in the substance are tightly bond to each other through strong intermolecular forces. Therefore, they can only vibrate around their fixed position, but they cannot move freely: as a result, the distance between the particles is the smallest among the 3 states of matter.

- Liquid: in a liquid, particles are able to slide past each other, however there are still intermolecular forces keeping them not too far from each other. As a result, in liquids, particles are on average more distance from each other compared to solids.

- Gas: in a gas, particles are completely free to move, as the intermolecular forces between them are negligible. As a result, in gases, the distance between molecules is the greatest, compared with solids and liquids.

Therefore, the phase changes in which the average distance between molecules increases is:

B. liquid to gas

Answer:

Released

Explanation:

When particles that attract each other come together, energy is usually released. The combination of the two particles is expected to result in a lower energy system. This lower energy system will be more stable than the different individual particles.

Hence, as this lower energy system is formed, the excess energy originally possessed by the particles is evolved hence energy is released when particles that attract each other are allowed to come together.

Answer:

6gm/cm³

Explanation:

It's simple,

The formula to Density is as follows,

Mass

Density = --------

Volume

Grams is a measurement of Mass and Cubic center meters is a measurement of Volume. Thats why we will fill in the formula like this,

54

D = -------

9

Then we divide to get,

D = 6

Next we fill in the units which are grams and cubic centimeters. The initials for the 2 are gm and cm³ so we'll combine those into this,

gm/cm³

Next we combine our answers which also brings us to our answer- 6 gm/cm³

Hope I was helpful,

Toodles

Answer:

False

Explanation:

It is false. For example, if a shark stays on land, what will happen. It would end up dying because it needs water and its in a dry environment.

Answer:

1.atomic number

2.electron

3.element

4.atom

5.neutron

6.nucleus

7.proton

Explanation:

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The matching exercise pairs terms like 'atomic number' and 'electron' with their correct definitions. The sum of protons and neutrons in an atom's nucleus is the 'mass number,' and the space where electrons are most likely to be found around the nucleus is known as an 'electron shell.'

Now, to address the descriptions provided

(a) The sum of the number of protons and neutrons in an atom is known as the mass number.

(b) The defined space around an atom's nucleus, where an electron is most likely to be found, is called an electron shell or energy level.

Answer: 1.11 atm

Explanation:

The unit of pressure include kilopascal (kPa), atmospheres (atm), mmHg etc

Now, given that:

Air pressure = 113 KPa

Convert kPa to atm

If 101.325 kPa = 1 atm

113 kPa = Z atm

To get the value of Z, cross multiply

Z atm x 101.325 kPa = 1 atm x 113 kPa

Z = ( 1 atm x 113 kPa) / 101.325 kPa

Z = 1.11 atm

Thus, the pressure is 1.11 atm

Answer:

2.13L

Explanation:

first you must find the amount(mols) of HCl in the solution. then you can use that to find the volume of the solution.

we know the:

mass m = 9.35g

molar mass M = 1 + 35.5=36.5 g/mol ( check periodic table )

concentration c = 0.120 mol/L

amount ( mols) of HCl:

n= m/M

n(HCl) = 9.35/36.5

= 0.2561644 mol

concentration of HCl in solution:

n= cV

V(HCl) = n/c

= 0.2561644/0.120

= 2.1347

= 2.13 L (3sf)

Final answer:

To find the volume of the solution, we can use the equation C₁V₁ = C₂V₂, where C₁ and V₁ are the concentration and volume of the stock solution, and C₂ and V₂ are the desired concentration and volume of the diluted solution.

Explanation:

To find the volume of the solution, we can use the equation:

C₁V₁ = C₂V₂

Where C₁ and V₁ are the concentration and volume of the stock solution, and C₂ and V₂ are the desired concentration and volume of the diluted solution. Rearranging the equation to find V₂:

V₂ = (C₁V₁) / C₂

Plugging in the given values, we have:

V₂ = (0.120 M * V₁) / 0.120 M

V₂ = V₁

Answer:

single replacement reaction.

Answer:

C) 0, +5

Explanation:

P + H2O + HNO3 -> H3PO4 + NO

We consider all compounds that contain phosphorus in the equation

A substance that has no charge has a zero oxidation state

Hence at the reactant, phosphorus has an oxidation state of 0

Let us consider H3PO4 at the product side

Oxidation state of

H =+1×3=+3

O=-2×4=-8

P = ?

H3PO4 is a neutral compound and has 0 oxidation state

The sum of the individual oxidation states of each atoms in H3PO4 is equal to 0

Hence,

+3 + P + (-8) = 0

3+P-8=0

P=-3+8=+5

Hence the oxidation state of phosphorus in H3PO4 is +5

Therefore, the oxidation state of P in the reaction changed from

0 to +5

Phosphorus is said to have undergone oxidation

Food acids are added to make flavors "sharper", and also act as preservatives and antioxidants.

Acids are added to foods in order to preserving food as well as a food additives.

Acids are added for preserving food products as well as preventing bacteria growth and maintain quality of a product. there are a number of fruits and vegetables that have different types of acid.

So we can conclude that acids are added to foods in order to preserving food as well as a food additives.

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Answer:

One mole is equal to 6.02214179×1023 atoms,  One mole contains 6.022 x 1023 molecules, 1 mol of an atom, molecule or formula unit contains 6.02 x 1023 atoms, molecules or formula units.

Explanation:

One mole of any substance contains 6.022\u00d71023 atoms, molecules, or formula units, known as Avogadro's number. Knowing the molecular formula is essential for determining the number of specific atoms in a mole of molecules. The molar mass is used to convert between the mass of a substance and the number of moles.

Understanding the Mole Concept in Chemistry

One mole of a substance contains 6.022\u00d71023 atoms, molecules, or formula units. This number is known as Avogadro's number, and it applies regardless of the substance being an element or a compound. Therefore, there are exactly 6.022\u00d71023 atoms in 1 mole of an element, 6.022\u00d71023 molecules in 1 mole of a molecular compound, and 6.022\u00d71023 formula units in 1 mole of an ionic compound.

For instance, to calculate the number of moles of a specific atom within a molecule, the molecular formula of the substance must be known. Considering 5.6\u00d71022 molecules of MgF2, one molecule of magnesium fluoride (MgF2) contains 1 atom of magnesium (Mg) and 2 atoms of fluorine (F). Hence, the total number of atoms of fluorine in 5.6\u00d71022 molecules of MgF2 would be twice the number of molecules, which is 1.12\u00d71023 atoms of fluorine.

In stoichiometric calculations, knowing molar mass is crucial as it links the mass of a substance (that can be measured on an analytical balance) to the amount of substance in moles. By using the formula of a compound and its molar mass, we can convert between grams and moles, and through Avogadro's number, relate moles to the number of atoms or molecules.

Answer:

(a) What are the half-lives of these two isotopes? (b) Which one decays at a faster rate? (c) How much of a 1.00-mg sample of each isotope remains after 3 half- ...

Explanation:

Answer:

3.0 L

Explanation:

V1/V2 = T1/T2

4.3L / V2 = 359K/250K

V2 = (4.3*250)/359 ≈ 3.0 L

Answer:

B. H2

Hydrogen gas is the oxidized (reducing agent).

In the reaction N₂O + H₂ -> H₂O + NH₃, oxidation and reduction involve changes in oxidation states. Nitrogen in N₂O is ostensibly the species that gets oxidized. therefore the correct option is e.

To determine which species is oxidized in the reaction N₂O + H₂ -> H₂O + NH₃, we need to look at the changes in oxidation states of the elements involved. Oxidation involves an increase in oxidation state. In this reaction, nitrogen (N) goes from a lower oxidation state in N₂O to a higher one in NH₃, implying that hydrogen (H₂) is gaining electrons and being reduced, meaning the oxidized species must be N₂O. However, the options provided do not correctly match the elements or compounds in the reaction as written. The question might contain a typographical error since none of the options correctly identify nitrogen in the form of N₂O or NH₃. Typically, the oxidation state of hydrogen (H) is +1, and for nitrogen in NH₃, it's -3. Based on standard oxidation states, the closest correct answer, despite the mislabeled choices, would be nitrogen in some form because it's nitrogen's oxidation state that is changing in this context, not hydrogen's in a way that would indicate it's being oxidized. Without the correct options provided, addressing this question accurately is challenging.

The complete question is

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Which species is oxidized in the following reaction? N₂O + H₂ -> H₂O + NH₃

A) N+

B) H2

C) H+

D) N3

E) None of the above.

Answer:

126g

Explanation:

Data obtained from the question include:

Mole of Fe = 2.5moles

Molar Mass of Fe = 56g/mol

Mass of Fe =?

Number of mole = Mass/Molar Mass

Mass = number of mole x molar Mass

Mass of Fe = 2.25 x 56

Mass of Fe = 126g

Therefore, the mass in 2.25mol of Fe is 126g

Answer: 126g

Explanation:

No of moles = mass given/molar mass

No of moles given=2.25mol

Molar mass of Fe= 56

Mass =?

Substitute the values into the formula

No of moles = mass given/molar mass

2.25= mass/56

Mass= 56×2.25

Mass = 126g

Mass of Fe in 2.25mols is 126g

Answer:

80.043 g/mol

Explanation:

Ammonium nitrate is a chemical compound, the nitrate salt of the ammonium cation. It has the chemical formula NH ₄NO ₃, simplified to N₂H₄O₃. It is a white crystalline solid and is highly soluble in water. It is predominantly used in agriculture as a high-nitrogen fertilizer.

John Dalton provided the basic theory about the nature of matter, which came to be known as Dalton's atomic theory.

According to Dalton's atomic theory, all matter is composed of small particles called atoms.

Dalton provided some postulates of this theory. Some of the important ones are:

So, as we see in the postulates, Dalton's atomic theory provided an explanation for the law of conservation of mass and the law of definite proportions.

The postulate of Dalton's atomic theory, i.e., "Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction." is the result of the law of conservation of mass.

The postulate "The relative number and kinds of atoms are constant in a given compound." can explain the law of definite proportion.

However, later it was found that there are some drawbacks of Dalton's atomic theory.

Hope you could understand.

If you have any query, feel free to ask.

Explanation:

Human activities commonly affect the distribution, quantity, and chemical quality of water resources. The range in human activities that affect the interaction of ground water and surfa.ce water

The effects of human activity on groundwater and surface water in a watershe, Watersheds directly affect water quality, whether it's for drinking or recreation. For example, algae blooms from fertilizer runoff draining into water harm watershed health, as do mercury and lead seeping into the water supply due to pollution. ... The polluted water supply that results can become harmful to humans.

a result, most water becomes polluted by human activities. These include: throwing sewage and industrial waste into rivers and oceans, using harmful fertilizers, and even littering. All of these human activities affect our water sources. ... Water pollution affects the plants, animals, and soil around the river.

Human activities such as industrial waste discharge, use of pesticides and fertilizers, urban development, and excessive groundwater extraction have significant impacts on groundwater and surface water in watersheds. These activities result in water pollution, flooding, erosion, land subsidence, and reduced water supply.

Human activities significantly impact both groundwater and surface water within a watershed. For example, industrial processes, agricultural practices, and urban development can all lead to the pollution of water sources. Industries often discharge waste into water bodies, which increases the chemical concentration affecting both groundwater and surface water. Additionally, the use of fertilizers and pesticides in agriculture seeps into the ground and contaminates groundwater, which eventually affects surface water as well.

Urban development affects watersheds by increasing impervious surfaces like pavement, reducing the land's ability to absorb water into the ground. This limits groundwater recharge and increases surface runoff, contributing to flooding and erosion.

Lastly, excessive groundwater extraction for agricultural, industrial, or domestic use can lower the water table in a process known as over-extraction. This has long-term consequences, including land subsidence and reduced water supply for future generations.

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Answer:

B. It does not show the functions of the cell parts

Explanation:

Cell models will always have some limitations. Here, the limitation is that Jillian did not include the functions of the cell parts, which can be confusing for someone on the outside who comes to take a look. So, the answer is B.

Choice A doesn't really make sense at all.

Obviously, the cell model is larger than a real animal cell, but that's the point of models - they are created to help scientists better understand and visualize very tiny things. Eliminate C.

This cell model is definitely not more complex than a real animal cell. If anything, it's more simplistic, so D is wrong.

Hope this helps!

Answer:

9.38mmHg

Explanation:

V₁ = 5m³

P₁ = 7.5mmHg

V₂ = 4.0m³

P₂ = ?

Applying Boyle's law,

The volume of a fixed mass of of gas is inversely proportional to its pressure as long as temperature is kept constant.

P = k / V

P₁ * V₁ = P₂ * V₂

v₂ = (p₁ * v₁) / v₂

V₂ = (5.0 * 7.5) / 4.0

v₂ = 9.375 ≈ 9.38mmHg

The new volume of the gas is 9.38mmHg

Answer:

Assuming the reaction you are referring to is the following:

AgNO3 + Cu --> Cu(NO3)2 + Ag

First, we should balance the reaction:

2 AgNO3 + Cu --> Cu(NO3)2 + 2 Ag

Now we carry out dimensional analysis, taking into account the molar ratios of different species as given in the balanced reaction and molar masses (which we can look up in the periodic table).

We begin with what we know, which is that we have 16.0 g Cu reacting and work our way toward the quantity that we would like to calculate, namely moles of Ag.

16.0 g Cu x   1 mol Cu    x   2 mol Ag    = 0.504 mol Ag

                     63.5 g Cu       1 mol Cu

Answer:

Gravitational force is also decreases.

Explanation:

Gravitational force is directly proportional to the mass of an object and inversely properly to the distance between their centres. Directly means if one increases the other automatically increases or if one decreases, the other also decreases. There is a direct relationship between mass and gravitational force so if mass of the bodies decrease, the gravitational force is also decreases.

Answer:

Explanation:

If the mass increases the the gravitational force will increase same as if the mass decreases the gravitational force will decrease as well.