Which characteristic do valence electrons indicate about reactions between atoms?

A.bond type
B.electronegativity difference
C.bond number
D.absolute electronegativity

Answer:Agi

+

kno3

Explanation:

Answer: it would be B

To complete and balance the molecular equation for the reaction of aqueous chromium(II) bromide (CrBr₂) and aqueous sodium carbonate (Na₂CO₃). Here is the step-by-step explanation:

1. Write the unbalanced molecular equation, including the physical states:
CrBr₂(aq) + Na₂CO₃(aq) → ?

2. Determine the products of the reaction. Chromium(II) bromide will react with sodium carbonate to form chromium(II) carbonate (CrCO₃) and sodium bromide (NaBr):
CrBr₂(aq) + Na₂CO₃(aq) → CrCO₃(s) + NaBr(aq)

3. Balance the equation:
CrBr₂(aq) + Na₂CO₃(aq) → CrCO₃(s) + 2 NaBr(aq)

So, the balanced molecular equation for the reaction of aqueous chromium(II) bromide and aqueous sodium carbonate is:
CrBr₂(aq) + Na₂CO₃(aq) → CrCO₃(s) + 2 NaBr(aq)

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Answer:

- melting

- sublimation

Explanation:

A phase change is a, well, change between phases. Solid to liquid. Gas to solid. Etc. Gases is a phase, but not a change. Reactions is a change, but not a phase change. This leaves us with melting (solid to liquid) and sublimation (solid to gas).

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Answer:

A calcium ion will form a 1+ charge because it will have more protons than electrons.

Explanation:

Electrons have negative charges

Protons have positive charges

Calcium likes to lose its extra electron to achieve an octet outer shell and be "happy".

There is the formation of intermolecular hydrogen bonding in ethanol as shown in the model below.

Intermolecular interactions can arise when ethanol, a common alcohol, is liquid. These interactions result from the ethanol molecule's polarity and hydrogen bonding propensity.

Two carbon atoms, five hydrogen atoms, and one oxygen atom make up the compound ethanol (C2H5OH). Because the oxygen atom is more electronegative than the carbon and hydrogen atoms, they are bound together by a polar covalent bond.

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Answer:

A. > digestive and circulation

B. > digestive and excertory

C. > nervous and muscluar

D.> digestive and circulation

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Answer:

Se administran 2500 gramos de solución por día.

Explanation:

Dado

Volumen de la solución = 2,5 litros

Como sabemos 1 litro = 1000 gramos

Por lo tanto, 2.5 litros = 2500 gramos

Se administran 2,5 litros en un intervalo de 24 horas o 1 día.

De ahí que se pueda decir que se administran 2500 gramos de solución al día.

Large particles usually get smaller as a result of surface reactions. Both heating and freezing effects of tiny particles on the climate are seen.

Weathering can be classified as either physical or chemical. There is a wide variety in soil particle size due to variations in weathering processes.The overall surface area increases when the size is reduced more. This is significant since most chemical changes start at an object's surface.

The Earth's materials are the four major elements that make up the earth's crust. The earth is made up of minerals, rocks, soil, and water. Earth materials include the necessary building components for life, agriculture, and industry.

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The exact effect of a catalyst on a reaction rate depends on the specific reaction.

Reaction rate is a measure of how quickly a chemical reaction proceeds. It is usually expressed as the amount of a substance that is converted or produced over a given period of time. Reaction rate is an important factor in many areas of chemistry including chemical engineering, biochemistry, and pharmacology. It is also a key parameter in the study of catalysts and enzyme kinetics. Reaction rates are affected by a variety of factors, such as reactant concentration, temperature, and the presence of a catalyst.

Generally speaking, catalysts can increase the reaction rate by several orders of magnitude (e.g., from seconds to nanoseconds). In some cases, it may even be possible for a catalyst to increase the reaction rate by a factor of over a million.

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Answer:

Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem.

1.00 mL of water at 25°C is heated to 100°C, where it boils at 1 atm air pressure and is vaporized. The volume difference is 1989 mL.

The volume difference between liquid water and steam at 100°C can be calculated using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin.

Assuming the water behaves as an ideal gas, we can use the equation to calculate the volume of water vapor produced:

n = m/M, where m is the mass of the water and M is the molar mass of water.

m = 1.00 mL x 0.997 g/mL = 0.997 g

M = 18.015 g/mol

n = 0.997 g / 18.015 g/mol = 0.0553 mol

The initial pressure is 1 atm and the final pressure is also 1 atm, since the water is boiling at atmospheric pressure. We also know that the temperature is 100°C = 373 K.

Using the ideal gas law, we can solve for the final volume:

V = nRT/P = (0.0553 mol)(0.08206 L·atm/(mol·K))(373 K)/(1 atm) = 1.99 L

Therefore, the difference in volume is:

1.99 L - 0.001 L = 1.989 L = 1989 mL

The volume of the water vapor is much larger than the volume of the liquid water, which is why steam can cause explosions if confined in a closed container.

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Explanation:

The closest orbital to the nucleus, called the 1s orbital, can hold up to two electrons. This orbital is equivalent to the innermost electron shell of the Bohr model of the atom. It is called the 1s orbital because it is spherical around the nucleus.

Answer: NaCl is an ionic compound

Explanation: Sodium Chloride is formed from Na+ and Cl- ions.

It is soluble in water, it has crystalline structure, it has high melting point and

It is insulator as solid form. Water solution leads current.

The majority of the energy required for life on Earth is produced and maintained by photosynthesis, which is also substantially responsible for producing and maintaining the oxygen content of the atmosphere. 

6CO₂ + 6H₂O = 6O₂ + C₆H₁₂O₆

6 moles of water are required for 1 mole of glucose.

Therefore, 0.9 x 6 = 5.4 moles of water are needed for every mole of glucose.

5.4 x 18 = 97.2 g

Plants and other living things employ a process called photosynthesis to transform light energy into chemical energy that can then be released through cellular respiration to power the organism's activities. Carbohydrate molecules like sugars and starches, which are created from carbon dioxide and water, contain some of this chemical energy.

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The rocks are classified as igneous, metamorphic, and sedimentary use the formation for classification purposes.

The outermost of them, called the crust, is composed of three types of rocks: magmatic, sedimentary and metamorphic. They are defined through the origin of several minerals and can be characterized with chemical composition, texture or shape, but the most used specification is based on composition.

The property does Valerie use for classification purposes is formation.

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Answer:

Explanation:

dilute hydrochloric acid is added to distilled water to increase the ionization of water.

The catalyst for the decomposition of aldehyde (CH3CHO) into CH4 and CO in the presence of I2 at 800 K is I2. The slower step in the two-step mechanism is the first step. So, the correct option is (b) I2, Ist step.

The catalyst for the reaction is I2, as it is present in the rate law and is not consumed in the reaction. The slower step in the two-step mechanism is typically the rate-determining step, so we can examine the rate law for clues. The rate law contains both CH3CHO and I2, which are involved in the first step, but only CH3I and HI are involved in the second step. Therefore, the slower step must be the first one, and the answer is b. I2 is the catalyst for the reaction and the slower step is the first one, CH3CHO+I2 → CH3I+HI+CO.

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If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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Answer:

Explanation:

A lever is a simple machine that can be used to increase the force or distance of an applied effort. The three main parts of a lever are the fulcrum, resistance arm, and effort arm.

The mechanical advantage of a lever depends on the ratio of the length of the effort arm to the length of the resistance arm. A longer effort arm will require less force to lift a load, but will require more distance to be moved. Conversely, a shorter effort arm will require more force to lift a load, but will require less distance to be moved.

The human activity that is most closely associated with depletion of the stratospheric ozone layer is the disposal of refrigerators and air conditioners, which contain chlorofluorocarbons (CFCs) and other ozone-depleting substances. Option (b)

When these substances are released into the atmosphere, they react with ozone molecules in the stratosphere, breaking them down and causing a depletion of the ozone layer. The use of CFCs in aerosols and solvents has also been a significant contributor to the depletion of the ozone layer.

While other human activities such as mining, heating of homes and factories, generation of electricity, and agricultural irrigation can have negative environmental impacts, they are not as closely associated with ozone depletion as the release of ozone-depleting substances from refrigerators, air conditioners, and aerosols.

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Full Question: Which of the following human activities is most closely associated with depletion of the stratospheric ozone layer?

A: Mining of coal

B: Disposal of refrigerators and air conditioners

C: Heating of homes and factories

D: Generation of electricity

E: Agricultural irrigation

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical.

Thus, Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colourless gas with a strong, pungent odour. It contributes considerably to the nutritional demands of terrestrial creatures by serving as a precursor to 45% of the world's food and fertilizers.

Biologically, it is a common nitrogenous waste, especially among aquatic animals.

The production of fertilizers in a variety of shapes and compositions, including urea and diammonium phosphate, uses about 70% of ammonia.

Thus, With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical.

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Answer:

The change in POP can not be reversed hence it is a chemical change.

Explanation:

Plaster of Paris (POP) is used to immobilize a fractured bone. The POP sets when water is added to it, it hardens irreversibly. Once it hardens, its shape can not be changed by any physical means. This means that the hardening of POP is a chemical change.

The chemical name of plaster of Paris is calcium sulfate hemihydrate. The setting of POP is an example of a chemical reaction.

Phenolphthalein indicator turns blue in basic solutions. The given statement is false because it is commonly used to determine the pH of a solution

Phenolphthalein indicator is a chemical compound commonly used to determine the pH of a solution. It is colorless in acidic solutions (pH below 7) and turns pink or magenta in basic or alkaline solutions (pH above 7). It does not turn blue in basic solutions. Phenolphthalein's color change occurs over a narrow pH range, typically between pH 8.2 and 10.0, making it an effective indicator for titrations involving weak acids and strong bases.

There are other indicators, such as bromothymol blue or litmus paper, that change color at different pH levels, and they can be blue under specific pH conditions. However, phenolphthalein remains one of the most widely used indicators for acid-base titrations due to its distinct color change and suitability for various applications. In summary, phenolphthalein indicator turns blue in basic solutions. The given statement is false because it is commonly used to determine the pH of a solution

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Answer:  Assuming the question wants to know the mass of the same volumes of ice and water:  57.5 g for ice and 62.7 g for water/

Explanation:  The density of ice and water are 0.917 g/cm^3 and 1.99 g/cm^3, respectively.  1cm^3 = 1ml

(62.7 ml)*(0.917 g/cm^3) = 57.5 g for ice

(62.7 ml)*(1.99 g/cm^3) = 62.7 g for water

Answer:

C. A carbon atom has six protons, six neutrons, and six electrons.

Explanation:

Carbon has a relative atomic mass of 12 and an atomic number of 6. We must recall that the atomic number of an atom is the number of protons in that atom. The atomic number is also the same as the number of electrons in the neutral atom of that element.

To ensure electrical neutrality of the atom, the number of protons in the atom must be equal to the number of electrons in the atom.

The mass number of an atom is the sum of the number of protons and neutrons present in the atom. Since carbon has a mass number of 12, then there must be six neutrons present in the atom.

According to the electronic configuration and structure of atom statement which is true is that a carbon atom has six protons, six neutrons, and six electrons.The correct option is C.

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.

The carbon atom has atomic number '6' giving it six electrons and six protons and neutrons each.Thus, option 'C' is correct.

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