if 165 g of h2o were cooled from 103oc to -5.0oc, what would be the calculated q for this exothermic process

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{4.36 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 72.425249\)

We have the final answer as

Hope this helps you

False. In a closed system, matter can not enter or exit that is there is no change in the matter of the system.

Three types of systems exist in nature:

1. Open System: In this system, the matter can interact with the surroundings or matter can enter or exit the system from the surrounding. Similarly, the energy of the system also interacts with its surroundings and can be lost or gained.

For example oceans etc.

2. Closed system: In this system, the matter is unable to interact with the surroundings that are matter can't exit or enter the system. While the energy of the system is able to interact with the surroundings.

For example Earth etc

3. Isolated system: In this system, both matter and energy are unable to interact with the surrounding. There is no exchange between matter and the energy of surroundings.

For example thermos-teel bottles etc.

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The characteristic of magma that determines its explosiveness is its silica content. The correct option is D.

Silica, also known as silicon dioxide (SiO2), is a major component of magma. Magma with high silica content is more viscous and sticky, which means that it resists flow and can trap gas bubbles.

As magma rises to the surface and pressure decreases, the gas bubbles expand and can cause the magma to erupt explosively.

Magma with low silica content, on the other hand, is less viscous and flows more easily, allowing gas bubbles to escape before they can build up enough pressure to cause an explosive eruption.

Therefore, the higher the silica content in magma, the more explosive the eruption is likely to be, the correct option is D.

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The "molecule a" referred to ATP in the equation.

So, option A is correct one.

The equation is given as,

\(C_{6} H_{12} O_{6}+ 6O_{2}\) → \(6CO_{2}+ 6H_{2}O + ATP\)

The above equation indicates the respiration activities in the plants.

The aerobic respiration takes place in the Mitochondria and which requires oxygen and glucose and produces carbon dioxide , water and energy.

The energy is in the form of  ATP. The pull form of ATP is adenosine triphosphate. The ATP is also called energy carrier because it found in the cells of the all living organism and this molecule carries energy.

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Answer: B

Explanation:

B

A model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.

Density is a measure of the compactness of a material.

Density is defined as the ratio of mass to the volume of a substance.

Dense materials have tightly packed particles while less dense materials have greater spaces between their particles.

Avogadro's hypothesis applies to substances in gaseous form since they do not have a constant volume.

Therefore, a model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.

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Answer:

I'm pretty sure it's body repair But it also maybe energy

Explanation:

Answer: A.

Explanation:

the science or study of how man and animals perform tasks and solve certain types of problems involving use of the body.

Hope this helps!....(bruh this was tuff)

the final temperature of water comes out to be 290.877 K. The quantity of work completed during the expansion must be determined in order to calculate the energy supplied to the water and the water's final temperature.

Following the gas expansion, we can apply the following equation to determine the water's final temperature:

q = mcΔT

Where: q = the heat the water absorbs

m = the water's mass

c is the water's specific heat capacity.

T stands for temperature change.

Let's start by calculating the heat that the water absorbed during the gas expansion:

q = the work that the gas does

The equation: can be used to determine how much work the gas is doing.

w = -PΔV

Where: w = job completed

Pressure is P.

V stands for volume change

We can determine the work done if we know that the pressure (P) is 3.0 atm and the change in volume (V) is 5.0 dm3 - 3.0 dm3 = 2.0 dm3.

w = 3.0 atm x 2.0 dm3, which is -6.0 atm dm3.

The heat absorbed by the water will be positive since the work completed, which represents work on the system, is negative:

Q=-w=6.0 atm dm3

Next, we must convert the work done's units to joules:

1 atm dm3 equals 101.375 J

At STP, 1 mol of gas takes up 22.4 dm3.

6.0 atm dm3 multiplied by 101.325 J/atm dm3 results in 607.95 J.

Now, we can determine the water's temperature change (T):

q = mcΔT

10 mol * 18.015 g/mol * 4.184 J/g K * 10.795 J = 607.95 J ΔT

753.78 g * 4.184 J/g K * T = 607.95 J

T = 753.78 g * 4.184 J/g K / 607.95 J

ΔT ≈ 0.180 K

The ultimate temperature is then determined by adding the temperature change to the 290.0 K starting point:

Final temperature = 290.0 K plus 0.180 K, or 290.180 K.

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Answer:

165.3 cm^3

Explanation: hope this is correct!!

P1 * V1 / T1 = P2 * V2 / T2

P1 = 84.6 kPa

V1 = 215 cm³

T1 = 23.5°C = 23.5 + 273 K = 296.5 K

At STP:

P2 = 101.3 kPa

V2 = ?

T2 = 273 K

Answer:

A: CI

B: Al \(+3\) and Ca + 2

C: H2O

Explanation:

Thats all ik

Answer:

the chemical formula for butane is C4H10

In a molecule with the formula AB3 and a trigonal pyramidal geometry, the central atom, A, is bonded to three other atoms, B. To determine the number of lone pairs on the central atom, we need to consider the valence electrons of the central atom and the total number of electrons around it.

The central atom, A, typically follows the octet rule, which means it prefers to have eight electrons in its valence shell. To determine the number of lone pairs, we subtract the number of bonded electrons from the total number of valence electrons.

For an atom in group 3A (such as Boron or Aluminum), it typically has three valence electrons. If A is in group 5A (such as Nitrogen or Phosphorus), it would have five valence electrons.

Since the molecule has a trigonal pyramidal geometry, we can infer that there is one lone pair on the central atom, A. The three bonded pairs of electrons (forming the AB3 part) and the lone pair give the molecule its trigonal pyramidal shape.

Therefore, in the molecule AB3 with a trigonal pyramidal geometry, the central atom, A, has one lone pair.

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Answer:

n = 1.15 mol

Explanation:

C = n/ V

n= C×V

n= 2.3× 0.5

n = 1.15 mol

Answer:

Explanation:

I am sorry but please give detailed question

Answer:

Step 1 − Divide the decimal number to be converted by the value of the new base.

Step 2 − Get the remainder from Step 1 as the rightmost digit (least significant digit) of new base number.

Step 3 − Divide the quotient of the previous divide by the new base.

Step 4 − Record the remainder from Step 3 as the next digit (to the left) of the new base number.

Repeat Steps 3 and 4, getting remainders from right to left, until the quotient becomes zero in Step 3.

Explanation:

Answer:

Option D, Aluminum

Explanation:

Valency of boron and hence it requires three electron to complete its outermost shell.

Valency of Aluminum is also three and it can donate three electrons to boron to complete the outermost shell of itself as well as the boron.

Hence, Aluminum and Boron will form 1:1 bond with each other. (Al-B)

Hence, option D is correct

Answer:

false.

Explanation:

the greenhouse effect traps heat close to the earth's surface, warming it and not cooling it.

The partial pressure of helium (He) in the container is 3 atm. Therefore, the correct answer is option c. 3 atm.we need to consider Dalton's law of partial pressures

To determine the partial pressure of helium (He) in the sealed container, we need to consider Dalton's law of partial pressures. According to this law, the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas.

Given that the total pressure in the container is 6 atm and equal masses of helium (He) and neon (Ne) are present, we can assume that the partial pressure of helium is equal to the partial pressure of neon.

Let's denote the partial pressure of helium as P(He) and the partial pressure of neon as P(Ne). Since the masses of He and Ne are equal, their mole ratios are also equal.

Therefore, we can write the equation:

P(He) / P(Ne) = n(He) / n(Ne)

where n represents the number of moles.

Since the mole ratios are equal, the partial pressures of He and Ne are also equal. Therefore, the partial pressure of helium is half of the total pressure:

P(He) = 6 atm / 2 = 3 atm

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The moles allow us to express an elements atomic mass in terms of grams. The atomic mass of an atom in the amu is numerically  same as the mass of the one mole of atoms of the element in the grams.

The One mole of the  substance is equal to 6.022 × 10²³ units of the substance like as the atoms, molecules, or the ions. The number 6.022 × 10²³ is known as the Avogadro's number or the Avogadro's constant.

The number of moles of substance can be calculated as :

The number of the moles = mass / molar mass

The molar mass of the substance is the atomic mass in the grams of the one mole of that substance.

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Both the Heisenberg uncertainty principle and the Schrödinger wave equation led to the concept of atomic orbitals, hence option D is correct.

The Heisenberg uncertainty principle claimed that it was impossible to know an electron's position and velocity at the same time. It gave rise to the notion that an electron would follow an orbital path, along which a general area could be identified.

It is defined as the presumption that a classical ensemble is susceptible to random momentum fluctuations of a strength that is dictated by and scales inversely with uncertainty in position.

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The features are:

-Number of carbons in the molecule

-Presence of an alpha hydrogen

-Presence of a carbonyl group

-Hybridization of the carbonyl carbon

-Presence of a hydrogen attached to the carbonyl carbon

The chemical and physical properties:

1. The functional group: The functional group, either an aldehyde (C=O) or a ketone (C=O) group, determines the chemical and physical properties of aldehydes and ketones. Aldehydes and ketones are both part of the family of compounds called carbonyl compounds and they have similar chemical properties due to the presence of the carbonyl group.

2. The size of the carbon chain: The size of the carbon chain of an aldehyde or ketone will also determine its chemical and physical properties. As the carbon chain increases in size, the boiling point of the compound increases, and its solubility in water decreases.

3. The presence of polar functional groups: The presence of polar functional groups attached to the carbon chain will also affect the physical and chemical properties of aldehydes and ketones. For example, if a hydroxyl group (–OH) is attached to the carbon chain, the compound will be more soluble in water and its boiling point will be lower.

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Answer:

a new substance

Explanation:

because it is chemival

MgX₃ has the same configuration as shown 1s2 2s2 2p6 3s2 3p6. So  the correct option is D.

The branch of science which deals with chemicals and bonds is called chemistry.

The representation of electrons in their shell is called electronic configuration. To find the element we have to count the electrons in it.

The total number of electrons is 2+2+6+2+6 = 18 which is argon a noble gas element.

The valency of the magnesium is 3, Hence the compound they will make is MgAr₃

Hence the correct option is D that is MgX₃.

Your question is incomplete most probably your full question was

1s2 2s2 2p6 3s2 3p6 Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed with magnesium, Mg, is..... (a) MgX (b) Mg2X (c) MgX2 (d) MgX3 (e) Mg3X2

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Answer:

ummm can you give an example

They mimicked the flight of birds.

Answer:

B.

Explanation:

Just took the test

Answer: B

Explanation:

Answer: When the forces are balanced, neither of the teams, but if the rope moves away in a particular direction or if a team wins, then the forces applied by both teams are unbalanced. Practically anything that moves is a result of the exertion of unbalanced forces on it.

Explanation:

The balanced or unbalanced forces are related to rotational motion by the occurrence of the constant and altered changes in the speed of the object.

Rotational motion may be defined as a type of motion that involves the movement of an object along an axis in a circular path with a common angular velocity.

Balanced forces maintain the state of an object at a constant speed. It means that its velocity remains unchanged during the course of the time interval. While unbalanced forces stimulate the alteration in the velocity of an object. It either reduces or enhances the initial speed of an object.

Therefore, the balanced or unbalanced forces are related to rotational motion by the occurrence of the constant and altered changes in the speed of the object.

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Answer:

b) electrons are shared in a covalent bond

Explanation:

remember for ionic bonding, it occurs between a metal and a non-metal, we know that the metal donates electrons to the non-metal while the non-metal is the receiver.

the reason why the metal donates electron is usually because it has between 1-3 electrons on its valence shell and therefore there is a weaker attraction of the positive nucleus to the outermost electrons hence why it is readily donated.

the opposite occurs for the non-metals hence why it readily accepts electrons to become stable

The true statements regarding the greenhouse effect are:

The greenhouse effect is a natural process that occurs when certain gases in the atmosphere, known as greenhouse gases, trap heat from the sun and prevent it from escaping back into space. This helps to keep the Earth's surface warm enough to support life. However, human activities, such as burning fossil fuels, have increased the concentration of greenhouse gases in the atmosphere, which has led to an enhanced greenhouse effect and global warming.

In the greenhouse effect, not all energy from the sun is absorbed by atmospheric gases. Rather, some of it is reflected back into space by the atmosphere. Additionally, the greenhouse effect does not change sunlight into carbon dioxide; rather, it is the burning of fossil fuels and other human activities that release carbon dioxide into the atmosphere. Options B, C and E are correct.

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Answer:

they were facing the oppisite ways

Explanation: