Which of the following accurately describes the behavior of water when subjected to temperature change?

A. A mass of water will expand if heated from 0°C to 2°C.
B. The volume of water will increase if cooled from 3°C to 2°C.
C. The volume of water will decrease if heated from 6°C to 7°C.
D. A mass of water will contract if cooled from 1°C to 0°C.

In an exothermic reaction, the energy of the reactants is higher than that of the products, signifying that energy is released. The activation energy is the difference between the energy of the reactants and the activated complex, and the enthalpy of reaction is the heat content change indicating if the reaction is exothermic or endothermic.

To determine whether a reaction is exothermic or endothermic, we can analyze the enthalpy change (ΔH). If ΔH is less than zero (ΔH < 0), this indicates that the reaction is exothermic. In an exothermic reaction, the energy of the reactants is higher than that of the products, and energy is released in the form of heat or light.

To calculate the activation energy (A), which is the minimum energy required to start a reaction, we consider the energy difference between the reactants (E) and the activated complex (B), also known as the transition state.

The enthalpy of reaction (C) represents the heat content change from reactants to products. In cases where the products (G) have lower energy than the reactants (F), the reaction is indeed exothermic. Therefore, in your answer, you should include ideas that reflect the concepts of activation energy, activated complex, enthalpy of reaction, energy of the reactants, and energy of the products to explain why the reaction is exothermic.

Explanation:

A balanced chemical reaction is a reaction in which there is equal number of atoms on both reactant and product side. Also, the mass of atoms or compounds present on reactant side equals the mass of atoms or compounds present on product side.

For example, [tex]CaSO_{4} + 2HCl \rightarrow CaCl_{2} + H_{2}SO_{4}[/tex]

Molar mass of [tex]CaSO_{4}[/tex] = 136.14 g/mol

Molar mass of 2[tex]HCl[/tex] = [tex]2 \times 36.46[/tex] g/mol = 72.92 g/mol

Therefore, sum of molar mass of reactants = (136.14 + 72.92) g/mol

                                                                       = 209.05 g/mol

Molar mass of [tex]CaCl_{2}[/tex] = 110.98 g/mol

Molar mass of [tex]H_{2}SO_{4}[/tex] = 98.07 g/mol

Therefore, sum of molar mass of products = (110.98 + 98.07) g/mol

                                                                       = 209.05

Therefore, we can see that it is true that when you balance a chemical reaction, you are making sure that the law of conservation of matter is obeyed.

Answer:

Legal laws are passed by lawmakers in a democratic process that accounts for people's opinions and beliefs.

Scientific laws are discovered and tested by experiments.

Legal laws can be changed if people change their minds.

Legal laws may have exceptions.

on edg

Explanation:

Changes in temperature and changes in pressure are two circumstances that can cause a system in equilibrium to change the concentrations of its reactants or products.

Two circumstances that can cause a system in equilibrium to change the concentrations of its reactants or products are changes in temperature and changes in pressure. Let's take temperature as an example. If the temperature of a system at equilibrium is increased, the reaction will shift in the direction that consumes heat, causing the concentrations of reactants and products to change. Similarly, if the temperature is decreased, the reaction will shift in the direction that releases heat, resulting in changes in concentrations as well.

The pH of the mixture solution is 0.745

The concentration of [tex]HNO_3[/tex] = 0.18 m

The concentration of [tex]HBrO[/tex] = 0.24 m

It is required to calculate the pH of the mixture solution.

pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

We know that [tex]HNO_3[/tex] is a strong acid while HBrO is weak acid.

Therefore we ignore the presence of the weak acid such that we consider the pH of the strong acid.

since

pH= - log (H⁺)

Hence pH= -log (0.18)

             pH  = 0.745

Therefore, the pH of the mixture solution is 0.745

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19.) Single-displacement is the correct answer.

20.) I am not sure, but Single-displacement is incorrect. At least you can cancel that one out.

2AlPO4 ( aq) + 3MgCl2 (aq) -> Mg3(PO4)2 (s) + 2AlCl3 (aq) 

Right answer is D
 

Answer : Yes, the given reaction is the complete balanced equation.

Explanation :

Balanced equation : It is defined as the number of individual atoms of an element present on the reactant side always be equal to the number of individual atoms of an element present on product side. That means the complete balanced equation are those which follows the law of conservation of mass.

When aluminum phosphate reacts with magnesium chloride in an aqueous solution then it gives magnesium phosphate and aluminium chloride as a product.

The complete balanced equation will be,

[tex]2AlPO_4(aq)+3MgCl_2(aq)\rightarrow Mg_3(PO_4)_2(s)+2AlCl_3(aq)[/tex]

By the stoichiometry, 2 moles of aluminium phosphate react with 3 moles of magnesium chloride to give 1 mole of magnesium phosphate and 2 moles of aluminium chloride.

Answer: D: 3.86

Explanation:

Answer is: B.  Water has a set of properties that are different from oxygen and hydrogen.

For example, boiling point of water is 100°C and oxygen has boiling point of -183°C and hydrogen has boiling point of -253°C.

Another example, at room temperature water is liquid, oxygen and hydrogen are gases.

Water is not flammable, hydrogen anf oxygen are flammable.

Water has polar covalent bonds, oxygen anf hydrogen have nonpolar bonds between atoms.

Answer:

B.

Water has a set of properties that are different from oxygen and hydrogen.

Explanation:

The characteristic properties of these elements are different from those of water. However, hydrogen and oxygen have some common properties. They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. ... Hydrogen has the lowest density of all the elements. Yee.

1. Ionic form is formed when one or more electrons from the valence shell of an atom (electropositive metal ) are completely transferred to the valence shell of another atom (electronegative non-metal). Ionic bonding is the complete transfer of valence electron(s) between oppositely charged atoms.

For example NaCl (sodium chloride ) is an ionic bond, in which valence electron from Na gets completely transferred to the valence shell of Cl and ionic bond is formed between opposite ions that is Na (positive) and Cl (negative).

[tex] Na^{+}(cation) + Cl^{-}(anion)\rightarrow Ionic bond [/tex]

So option 'C' is correct choice.

2. A neutral atom can lose or gain an electron.

If the neutral atom loses an electron it will become ion with positive charge known as 'Cation'

If the neutral atom gains an electron it will become ion with negative charge known as 'Anion'

So an ion which positive charge is called 'Cation' , option B is correct.

An attraction between two atoms of the opposite charge forms an ionic bond. An ion with a positive charge is known as a cation.

The attraction between two atoms of the opposite charge forms an ionic bond. The negatively charged atom (anion) and positively charged atom (cation) experience a strong electrostatic attraction that constitutes an ionic bond. This typically occurs between a metal and nonmetal atom.

An ion with a positive charge is called a cation. Cations are usually metals. For example, when neutral sodium loses one electron, it becomes a positively charged sodium cation (Na+).

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One mole of copper(II) sulfate, CuSO4, contains 6.022 x 10^23 atoms.

One mole of copper(II) sulfate, CuSO4, contains 6.022 x 1023 atoms. This can be determined using Avogadro's number, which states that one mole of any substance contains 6.022 x 1023 atoms or molecules. Therefore, in one mole of copper(II) sulfate, there would be 6.022 x 1023 copper atoms, 6.022 x 1023 sulfur atoms, and 24.088 x 1023 oxygen atoms.

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One mole of copper(II) sulfate contains four moles of oxygen atoms. Using Avogadro's number, it translates to approximately 2.4088 x 10^24 oxygen atoms.

The question asks for the number of oxygen atoms present in one mole of copper(II) sulfate (CuSO4). Copper sulfate contains one copper atom (Cu), one sulfur atom (S), and four oxygen atoms (O). Hence, one mole of copper(II) sulfate would contain four moles of oxygen atoms.

Using Avogadro's number, which states there are 6.022 x 10^23 entities (such as atoms) in one mole, we can say that one mole of copper(II) sulfate contains 4 times 6.022 x 10^23 oxygen atoms, which is approximately 2.4088 x 10^24 oxygen atoms.

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A reservoir is a body of water. Towns and municipalities use it to capture water and it then seeps through the ground which cleans it and then it gets filtered into this processing thing and it then gets shipped out in pipes to peoples houses. A reservoir is a broad term though. You can have a reservoir of a variety of things such as a reservoir of oil kind of like a surplus where you can store it but in most cases, people talk about water.

In a phase change diagram, the arrows representing an increase in kinetic energy of particles are those showing endothermic transitions: melting, vaporization, and sublimation, which are marked by purple arrows.

Phase changes involve a change in kinetic energy of particles. When particles transition from solid to liquid, liquid to gas, or solid to gas, their kinetic energy increases. These changes are represented by the purple arrows in the diagram.

In a phase change diagram, the arrows that represent changes where  the kinetic energy of the particles increases are those that indicate heating: from solid to liquid, liquid to gas, and solid to gas. These transitions are endothermic, meaning they require an input of energy from the surroundings. When a substance changes from a solid to a liquid (melting), from a liquid to a gas (vaporization), or directly from a solid to a gas (sublimation), the particles gain kinetic energy, allowing them to move more freely and overcome the intermolecular forces holding them together in a more ordered state.

On the phase diagram, these changes are denoted by the purple arrows. Conversely, transitions from a less ordered state to a more ordered state (freezing, condensation, and deposition), indicated by the green arrows, are exothermic. This means energy is released as particles lose kinetic energy and move into a more stable, ordered state.

Answer:

The average kinetic energy of the particles would reduce, subsequently leading to reduced average motion of the particles. If the decrease in temperature persists, the particles eventually change phase and move to a less mobile state of matter than the phase in which they currently are in.

Explanation:

The image for the question is missing and we couldn't find thay online.

But it isn't hard to imagine what the image would be.

It is said to be a picture depicting particles that are in two different phases (liquid and gas).

What would likely happen if the temperature of the particles were decreased?

All particles of matter are said to always be in a constant state of motion (random motion); with the motion very evident in particles in gaseous phase than particles in liquid phase, then particles in the solid phase.

A decrease in temperature for any type of particles in whichever state will result in a reduced kinetic energy of such particles. As the kinetic energy with which the particles moving with constant, random motion is directly proportional to the absolute temperature of the system in which such particles are contained in.

So, a decrease in temperature for both gaseous and liquid particles will result in reduced and reduced kinetic energy and subsequently a reduction in the average motion of the particles.

For the gaseous particles, if the decrease in temperature continues to a point, the gaseous particles lose enough kinetic energy to change phase from gaseous form to a phase (liquid phase) where the motion is more restricted, average motion reduces and kinetic energy of the particles drop too. This is condensation; changing from gaseous phase to liquid phase.

The liquid particles follow a similar course too, only that a continuous decrease in temperature will lead to reduced motion and kinetic energy until the liquid particles 'freeze' by changing phase into the solid phase where the average motion is much more reduced and limited to vibrational motion about a particular fixed point.

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The final balanced equation is 3Cu(s) + 2HNO₃(aq) + 6H⁺(aq) → 3Cu²⁺(aq) + 2NO(g) + 4H₂O(l).

To balance the redox reaction of copper with nitric acid in acidic conditions, we need to write separate half-reactions for oxidation and reduction, balance them for mass and charge, and then combine them into a balanced overall equation. The oxidation half-reaction involves copper turning into copper(II) ions:

oxidation:
Cu(s) → Cu²⁺ (aq) + 2e⁻

For the reduction half-reaction, nitric acid is reduced to nitrogen monoxide:

reduction:
HNO₃(aq) + 3e⁻ → NO(g) + H₂O(l)

Now we multiply each half-reaction by a number that will balance the electrons lost in oxidation with the electrons gained in reduction. For this equation, we multiply the oxidation half-reaction by 3 and the reduction half-reaction by 2:

3Cu(s) - 3Cu²⁺ (aq) + 6e⁻
2HNO₃(aq) + 6e⁻ - 2NO(g) + 2H₂O(l)

Now we combine the half-reactions and add 6H⁺ to balance the hydrogen:

3Cu(s) + 2HNO₃(aq) + 6H⁺ (aq)
ightarrow 3Cu²⁺ (aq) + 2NO(g) + 4H₂O(l)

This equation represents the balanced redox reaction in acidic solution between solid copper and nitric acid to produce aqueous copper(II) ions and nitrogen monoxide gas.

The complete question is:

Balance the following equation in acidic conditions. Phases are optional.

Cu+NO3- = Cu2+ NO

(redox and Oxidation reactions)

The solute that is found in the greatest amount in ocean water is salt.

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