Important: How much energy would be required to vaporize 45.0 grams of water?

B.

mass equal to that of a proton; negative charge

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:

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

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.

Answer:

B

Explanation:

Population size is the number of individuals in a population.

Population density is the average number of individuals per unit of area or volume.

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:

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:

The answer to the question is deposition

Deposition is the natural processes added sediments, soil, rocks, or other Earth debris to landforms. Hence option b is correct.

Decomposition is defined as the procedure by which decomposed organic materials are converted into more basic organic or inorganic compounds such carbon dioxide, water, simple sugars, and mineral salts. The process of decomposition is intricate. Nitrogen and carbon dioxide are the mineral forms of nutrients that are produced during the breakdown of organic materials.

The geological process of deposition involves the addition of sediments, soil, and rocks to a landform or landmass. Previously weathered surface material is carried by wind, ice, water, and gravity. When enough kinetic energy in the fluid is lost, it is deposited, creating layers of sediment.

Thus, deposition is the natural processes added sediments, soil, rocks, or other Earth debris to landforms. Hence option b is correct.

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Answer:

A. Sometimes the coefficient for the oxygen molecule is not a whole number

Explanation:

The correct answer is option  A. Sometimes the coefficient for the oxygen molecule is not a whole number.

Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.

Balancing combustion reactions is easy. First, balance the carbon and hydrogen atoms on both sides of the equation. Then, balance the oxygen atoms.

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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: The forward and reverse reactions eventually reach the same rate.

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.

The equilibrium is dynamic in nature and the reactions are continuous in nature. Rate of forward reaction is equal to the rate of backward reaction and it appears as it has stopped.

Answer:b a

Explanation:

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:

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.

Answer:

0.21M of C3H5O(COOH)3

Explanation:

Molarity = no of mole/ volume of solution

Molar mass of C3H5O (COOH)3 = 192.12g

No of mole of C3H5O (COOH)3 = 141.6/192.12 = 0.74mol

1000mL = 1L

3500mL = 3.5L

Molarity = 0.74/ 3.5 = 0.21M of C3H5O (COOH)3

Answer:

0.2M

Explanation:

The molarity of a solution is given by;

M = number of moles / volume

Number of moles = mass/molar mass

Mass of Citric acid = 141.6g

Molar mass of citric acid = (6×12)+(8×1)+(7×16)

= 72+8+112=192g/mol

Number of moles of citric acid=141.6/192=0.74mol

Volume = 3500.0 mL = (3500/1000)L=3.5L

Molarity of the solution = 0.74mol/3.5L=0.2mol/L

Therefore, 0.2mol/L or 0.2M concentration is prepared by dissolving 141.6 g of citric acid, C3H5O(COOH)3, in 3500.0 mL of water

Answer:

the answer is A

Explanation:

According to the law of conservation of energy or the first law thermodynamics energy neither be created nor destroyed, energy is transferred from one form to another form.

When a 200°C iron bar is placed in thermal contact with a 30°C block of wood then, energy leaves the iron bar and enters the wood until the temperatures are equal. Option A is correct.

According to the law of conservation of energy, energy will not be created or destroyed, but it can be transferred from one object to the another object or transformed into a different forms.

When a 200°C iron bar is placed in thermal contact with a 30°C block of wood, heat energy will transfer from the higher-temperature iron bar to the lower-temperature wood until both objects reach thermal equilibrium (i.e., until their temperatures become equal). This is based on the principle that heat flows from hotter objects to colder objects in an attempt to reach equilibrium.

Hence, A. is the correct option.

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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:

monoxide

dioxide

trioxide

tetroxide

pentoxide

hexoxide

heptoxide

octoxide

nonoxide

Explanation:

Just the way it is. If there is an -a or -o infront of the oxide(or another substance that starts with vowel), the a is often dropped.

Answer:

pH = 1

Explanation:

pH = - log [1.0*10(^-1) ]= 1

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:

Scientists don't actually measure astronomical distances in light years. Rather, they measure them in a unit called the Parsec , and only convert to light years when they're talking to the general public . One light-year is the distance light travels through space in one year.

Explanation:

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:

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:

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

Answer:

endothermic reaction.

Explanation:

An increase in the temperature of a system at equilibrium favors the backward or reversible reaction.

According to the equilibrium law, when any external stress is applied at the equilibrium state then the equilibrium will shift to that side which decreases the external affect.

Suppose a chemical reaction which is exothermic in nature will be represented as:

A + B ⇄ C + D

If we increases the temperature then reaction will shift to the left side to overcome the effect of increased temperature.

Hence reversible reaction proceeds on increasing the temperature.

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Answer:ThE aNsWeR iS B

Explanation: The earth was one a big ocean but than volcanoes explode and that created land :)

If you're hiking in the mountains and you find shells by accident, you know that the mountain was once under the sea. Therefore, the correct option is option B.

A mountain is indeed an elevated area of the crust of the Earth, typically with steep - sided that reveal a substantial amount of bedrock that has been exposed. Although variations exist, a mountain is normally taller than a hill, rising as least 300 meters (1,000 feet) just above surrounding ground.

Most mountains are found in mountain ranges, while a handful have solitary peaks. Tectonic forces, erosion, and volcanism, which operate on time spans as long as tens of millions of years, are responsible for the formation of mountains. You look for shells when you visit the beach. However, if you're hiking in the mountains and you find shells by accident, you know that the mountain was once under the sea.

Therefore, the correct option is option B.

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