how many dots would appear on the lewis electron dot diagram for an atom whose electron notation ends in 6s25d106p4?

Answer:

\(c=3.71\ J/g^{\circ} C\)

Explanation:

Given that,

Mass of sample, m = 996.9 g

The change in temperature of the sample, \(\Delta T=-70.98^{\circ}C\)

Heat produced, Q = 62.9  calories = 263173.6 J

The heat released by a sample due to change in temperature is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat capacity

So,

\(c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{263173.6}{996.9\times 70.98}\\\\c=3.71\ J/g^{\circ} C\)

So, the specific heat of ethanol is equal to \(3.71\ J/g^{\circ} C\).

The balanced dissociation equation for Mg(OH)₂ in aqueous solution is: Mg(OH)₂(s) → Mg²⁺(aq) + 2OH⁻(aq)

Mg(OH)₂ is a compound that dissociates in water to form magnesium ions (Mg²⁺) and hydroxide ions (OH⁻). In the solid state, Mg(OH)₂ exists as an undissociated compound. However, when it is dissolved in water, it dissociates into its constituent ions.

The balanced dissociation equation represents the separation of Mg(OH)₂ into its ionic components. The equation shows that one molecule of Mg(OH)₂ dissociates to form one Mg²⁺ ion and two OH⁻ ions. The charges on the ions are balanced to ensure overall charge neutrality.

The state of each species is indicated in the equation. Mg(OH)₂(s) represents the solid state of the compound, while Mg²⁺(aq) and OH⁻(aq) indicate that the magnesium and hydroxide ions are in the aqueous (dissolved) state.

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It is thought that global dimming is probably due to the increased presence of aerosol particles in Earth's atmosphere, caused by pollution, dust, or volcanic eruptions. Aerosols and other particulates absorb solar energy and reflect sunlight back into space. ... Water droplets in clouds coalesce around the particles.

Global Dimming

source:

wikipedia via gooogle snippet

Photosynthesis removes CO2 and animal activities, burning fossil fuels and burning wood add CO2.

Why is CO2 needed?

The main greenhouse gas that helps keep our atmosphere warm is carbon dioxide. Without them, our earth would be uninhabitable. However, the rise in average global temperature due to rising levels of CO2 in our atmosphere is affecting other aspects of Earth's climate. Carbon dioxide is required for the internal respiration of the human body. Internal respiration is the process of removing carbon dioxide and delivering oxygen to body tissues.

The pH value of the blood is protected by the vital carbon dioxide. Therefore, only plants excrete CO2.

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Answer: D

Explanation:

Determine the number of moles of hydrogen atoms in .0885 mol C4H10

Explanation:

ion

valence electrons

isotope

covalence

ionic

To calculate the standard Gibbs free energy change (ΔG°) for a reaction using thermodynamic data, we can utilize the equation:

ΔG° = ΣnΔG°f(products) - ΣnΔG°f(reactants)

where ΔG°f is the standard Gibbs free energy of formation for each species and n represents the stoichiometric coefficients of each species in the balanced equation.

Reaction: N2(g) + 3H2(g) ⟶ 2NH3(g)

Partial pressure of N2(g) = 12.52 mmHg / 760 mmHg/atm = 0.016447 atm

Partial pressure of H2(g) = 12.52 mmHg / 760 mmHg/atm = 0.016447 atm

Partial pressure of NH3(g) = 12.52 mmHg / 760 mmHg/atm = 0.016447 atm

ΔG° = (2 * ΔG°f(NH3)) - (1 * ΔG°f(N2)) - (3 * ΔG°f(H2))

ΔG° = (2 * (-16.45 kJ/mol)) - (1 * 0 kJ/mol) - (3 * 0 kJ/mol)

ΔG° = -32.90 kJ/mol

Therefore, the ΔG° for the reaction N2(g) + 3H2(g) ⟶ 2NH3(g) at 298.15 K and a pressure of 12.52 mmHg for each gas is -32.90 kJ/mol.

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In a galvanic cell, the reaction proceeds towards the production of products.  ΔG starts < 0, becomes more negative

Option B is correct .

As the reaction proceeds, the Gibbs free energy (ΔG) reduces, and the following are true:  ΔG starts < 0, becomes more negative.

When the reaction in a galvanic cell proceeds towards the production of products, the Gibbs free energy starts with a negative value, and it becomes even more negative.

The Gibbs free energy (ΔG) is a measure of the available energy in a system that can be used to do work. It measures the difference between the free energy of the final state and the initial state.The Gibbs free energy change of a system is dependent on the enthalpy and entropy change. If the enthalpy change is negative (exothermic), and the entropy change is positive (disorderly), the Gibbs free energy change is negative, and the reaction is spontaneous.

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During a thunderstorm men saw lightning Flash in the distance a few seconds later men heard thunder . So , during a thunderstorm , lightning is seen first and thunder is heard later on because light travels faster than sound .

Because sound travels at a speed of 330 m / s while light travels at a speed of 300,000,000 m / s , lightning appears earlier and thunder appears later . A sound cannot travel as quickly as light . As a result , you are the first to see the lightning's light .

Five times hotter than the sun's surface, the air in the lightning channel can get as hot as 50,000 degrees Fahrenheit. The air rapidly cools and constricts following the flash. The sound wave that we associate with thunder is produced by this quick expansion and contraction.

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The structure of organic compounds allows them to function as pigments through chromophore and acid or basic groups.

This is defined as a colored substance which is completely or nearly insoluble in water.

The structure of organic compounds allows them to function as pigments include chromophore and the acid or basic groups such as OH, SO3H, etc.

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when 0.367 mol of a weak acid, hx, is dissolved in 2.00 l of aqueous solution, the ph of the resultant solution is 2.60. ka for hx is 3.405 × \(10^{-5}\)

Number of moles = 0.367

Volume of solution = 2l

concentration = 0.367/2 = 0.1835 mol/L

ph = 2.60

we know

ph = - log [H+]

2.51 × \(10^{-2.60}\)M = [H+]

The acid HX dissociate as

HX → H+   +  X-

The acid dissociation constant Ka, for the dissociation reaction is

Ka = [H+][X-]/[HX] ; at equilibrium, [H+] = [X-]

Ka = 3.405 × \(10^{-5}\)

A solution in which water serves as the solvent is called an aqueous solution. The most common way to represent it in chemical equations is to add (aq) to the appropriate chemical formula. For instance, the formula for a solution of table salt, or sodium chloride (NaCl), in water is Na+(aq) + Cl The word aqueous, which derives from the word aqua, means that something is connected to, resembles, or is dissolved in water. Water is a common solvent in chemistry because it is an excellent solvent and abundant in nature. Since water is frequently used as the experiment's solvent, unless otherwise stated, the term "solution" refers to an aqueous solution.

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2 SO₂ (g) + O₂ (g)  ---> 2 SO₃ (g)

1.204 * 10²⁴ number of SO₂ molecules = 2 number of moles of SO₂

6.02 * 10²³ number of O₂ molecules = 1 number of moles O₂

1.204 * 10²⁴ number of SO₃ molecules = 2 number of moles of SO,

4 P(s) + 5 O₂ (g) ----> P₄O₁₀ (S)

2.408 * 10²⁴ number of P(s) atoms = 4 numbers of moles of P(s)

3.01 * 10²⁴ number of O₂ molecules  = 5 number of moles O₂

6.02 * 10²³ number of moles P₄O₁₀ = number of P₄O₁₀ molecules

1.5 moles of P₄O₁₀ are produced from 7.5 moles of O₂.

14 moles of P(s) are needed to produce 3.5 moles of P₄O₁₀.

2.5 moles of O₂ will need to react to synthesize 0.5 moles of P₄O₁₀.

The mole ratio of the given reactions is obtained from their equations of reaction.

1. 2 SO₂ (g) + O₂ (g)  ---> 2 SO₃ (g)

The mole ratio is 2 : 1 : 2

1 mole of atoms or molecules contains 6.02 * 10²³ particles.

Hence, the number of particles is obtained by multiplying the number of moles by 6.02 * 10²³.

4 P(s) + 5 O₂ (g) ----> P₄O₁₀ (S)

7.5 moles of O₂ will produce 7.5/5 moles of P₄O₁₀  = 1.5 moles of P₄O₁₀  

3.5 moles of P₄O₁₀ will be produced by 3.5 * 4 moles of + = 14 moles of P(s)

0.5 moles of P₄O₁₀ will be produced by 0.5 * 5 moles of  O₂ = 2.5 moles of O₂

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Answer:

Electrons

Explanation:

Cathode rays carry electronic currents through the tube. Electrons were first discovered as the constituents of cathode rays. J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.”

The rays produced in a cathode tube are electrons which are present in the shells surrounding the nucleus of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

salt dissolving

Explanation:

Hope this helps!

Answer:

Independent Variable: The thing in an experiment which is changed.

Dependent Variable: The thing in an experiment which is affected by the change. (In other words, it's affected by the independent variable.)

Control Variable: The other factors of the experiment that remain unchanged.

For example, say you want to do an experiment about the effects of water on plant height. So, the independent variable, or the thing that is changed would be the amount of water, and the dependent variable would be the plant height, as the plant height is directly affected by the independent variable. Lastly, for this to be a fair experiment, there must be control variables. For example, all of the plants should be put in a room with equal temperature, they should get the same amount of sunlight, etc.

I hope this answers your question- feel free to ask me if you need any more help.

Answer with Explanation:

Lol.. even i was confused before  .. so i learnt now ill help u :

Simple!

See... lets take simple expirament to explain:

My expirament is to verify if sunlight affects the growth of plants ...

So here :

My controlled variable : It is what is held constant.. So ur supposed to NOT it like everything else expect sunlight..(ex: water, soil, type of plant etc)

My Independent variable : Variable that is changed.... So this is wht  u ARE changing to make th expirament ... (for ex: here sunlight u will chanhe... u will put on in a dark room and a nother in the light..)  

My dependetn variabe:l Some thing that changes on is own..cause of the expiramen t... like the result ..(for ex: height , growth of plant etc)

I hope u  understood !!  :))

Inertia and gravity combine to keep the Earth in its orbit around the Sun. Inertia is the tendency of an object to remain in motion or at rest unless acted upon by an external force.

Gravity is the force of attraction between two objects that have mass. The Sun's gravitational pull on the Earth creates a centripetal force that pulls the Earth towards the Sun. At the same time, the Earth's inertia is trying to keep it moving in a straight line. These two forces balance each other out, and as a result, the Earth orbits the Sun in an elliptical path. The amount of gravitational force between two objects depends on their masses and the distance between them. The larger the mass of the objects and the closer they are, the stronger the gravitational force. In the case of the Earth, the force of gravity exerted by the Sun is strong enough to overcome the Earth's inertia and keep it in its orbit.

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Answer:

1. Renewable Resource

2. Carbonate

3. Fossil Fuel

4. Nonrenewable Resource

5. Carbon Cycle

Answer:

1. Renewable Resource

2. Carbonate

3. Fossil Fuels

4. Non-renewable Resource

5. Carbon Cycle

To determine the molarity of HNO3, we can use the concept of stoichiometry and the volume and concentration information provided. The balanced chemical equation for the reaction between KOH and HNO3 is: KOH + HNO3 -> KNO3 + H2O

From the given information, we know that 3 mL of 0.115 M KOH is required to reach the equivalence point when titrating 15.0 mL of HNO3.

Using the concept of stoichiometry, we can set up a ratio between the volumes and concentrations of the two solutions:

(Molarity of KOH) x (Volume of KOH) = (Molarity of HNO3) x (Volume of HNO3)

(0.115 M) x (3 mL) = (Molarity of HNO3) x (15.0 mL)

Solving for the molarity of HNO3, we get:

Molarity of HNO3 = (0.115 M) x (3 mL) / (15.0 mL)

Molarity of HNO3 = 0.023 M

Therefore, the molarity of HNO3 is 0.023 M.

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Below is the balanced chemical equation. 1.07 103 kilograms of carbon dioxide will be created. Every balanced chemical equation adheres to the principle of mass conservation.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

Every balanced chemical equation follows the law of conservation mass , according to the information provided.

The total number of individual atoms on the reactant side and the total number of individual atoms on the product side must match,

according to this law.

The balancing chemical for the indicated reaction equation follows:

C₃H₈+5O₂→3CO₂=4H₂O

All the substances are present in gaseous state.

By Stoichiometry of the reaction:

1 mole of propane gas produces 3 moles of carbon dioxide gas.

So, 3.65 moles of propane gas will produce =  of carbon dioxide gas.

Now, calculating the mass of carbon dioxide using equation:

3/1×3.65

=10.95

Molar mass of carbon dioxide = 44 g/mol

Moles of carbon dioxide = 24.33 mol

Putting values in above equation, we get:

10.95=Mass of carbon dioxide÷44g/mol

         =4.50×10³g

Hence, the amount of  produced in the given reaction and expressed in scientific notation is 4.50×10³

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Answer:

Bond

Explanation:

Bond is a link between atoms and molecules, and cohere means the uniting of something, so therefore it is bond.

When atoms share electrons, a covalent bond occurs.

A covalent bond is formed when atoms share electrons between them. In this type of chemical bond, atoms with unpaired electrons in their outermost energy levels (valence electrons) come together and share one or more pairs of electrons. Covalent bonding is commonly observed in nonmetallic elements or between nonmetallic and hydrogen atoms.

The shared electrons create a stable electron configuration for both atoms involved in the bond, resulting in a more stable molecule. The number of electrons shared determines the nature of the covalent bond. Single covalent bonds involve the sharing of one electron pair, double covalent bonds involve two pairs, and triple covalent bonds involve three pairs of electrons.

Covalent bonds are essential in many biological and chemical processes. They form the foundation of organic chemistry, where carbon atoms commonly form covalent bonds with other atoms. Covalent bonds contribute to the stability and structure of molecules, allowing for the formation of complex macromolecules like proteins, DNA, and carbohydrates.

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They include the folowing;

1. The break-up of firm particles = Endothermic heat absorbing process

2. The break-up of solute fragments = Endothermic heat arresting process

3. The joining of solute and solvent particles = Exothermic heat bearing process

The Enthalpy of Resolution maybe found in this manner including three elements: ΔHsoln = ΔH1 + ΔH2+ ΔH3

1. Break-up of the solute molecules from each one (extending the solute), this is an endothermic response. (ΔH1)

2. Break-up of the financially sound molecules from each one (extending the solid fragments), this is also an endothermic backlash (ΔH2)

In their divided states, the solute and fit fragments are free to attract each one liquid.

3. The exothermic response of the solute and fit resulting in the composition of the resolution. (ΔH3)

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Answer

false

explanation

air is the most important element in respiration

The correct statement about the equilibrium constant, Keq, is that when Keq>1, the equilibrium favors the products.

The Keq value gives an idea about the relative concentration of reactants and products at equilibrium. If Keq is greater than 1, it means that the concentration of products is more than the concentration of reactants, and the equilibrium favors the products.

Conversely, if Keq is less than 1, it means that the concentration of reactants is more than the concentration of products, and the equilibrium favors the reactants. The magnitude of Keq also gives an idea about the extent of the reaction, i.e., the larger the Keq value, the more the reaction goes towards completion. However, it does not tell us about the speed of the reaction.

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Answer:

B

Explanation:

thermal energy is the energy between one object to another

Answer:

1. single replacement

Explanation:

Single replacement can be represented by AB+C ⇄B+AC, which matches the picture

Double replacement and double displacement are the same kind of reaction and can be represented by AB+CD ⇄BD+AC

Decomposition reaction can be represented by AB ⇄A+B