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Copper oxide is a(n):
atom.
molecule.
subatomic particle.
element.
compound.

Answer:

The gravitational pull of the moon on the water near the coast (option A) can explain the daily change in sea level observed along a coast.

Explanation:

The tides are rising and falling from sea level that occur several times a day. These periodic changes in the level of the sea are produced by the gravitational forces of attraction of the Sun and the Moon with respect to the Earth. But the force of attraction of the Moon is greater than that of the Sun, due to the proximity of the satellite.

High tide or high tide is the time when the sea reaches its maximum height. Low tide or low tide is the time when the sea reaches its minimum height.

The tide is noticed on the beaches because the coastline can go forward or backward many meters.

Finally, the gravitational pull of the moon on the water near the coast (option A) can explain the daily change in sea level observed along a coast.

Answer:

The volume will be 4.44 L

Explanation:

Data:

First volume, V1 = 6 L

First pressure, P1 = 150 kPa -> 150 kPa * 1 atm/101.325 kPa = 1.48 atm

Second pressure, P2 = 2 atm

Second volume, V2 = ? L

From Boyle's law:

P1*V1 =P2*V2

V2 = P1*V1/P2

V2 = 1.48*6/2

V2 = 4.44 L

we have been given the [OH⁻] therefore we can first find the pOH value

pOH scale is used to determine the basicity of a solution

pOH = - log [OH⁻]

pOH = - log (1 x 10⁻¹¹ M)

pOH = 11

after knowing the pOH we can calculate pH using following equation

pH + pOH = 14

since pOH = 11

pH = 14 - 11

pH = 3

pH scale is used to determine how acidic a solution is

once pH is known we can can calculate Hydrogen ion concentration

pH = - log [H⁺]

[H⁺] = antilog (-pH)

[H⁺] = antilog(-3)

[H⁺] = 1 x 10⁻³ M

if pH is less than 7 - solution is acidic

pH = 7 the solution is neutral

pH more than 7 - solution is basic

pH of solution is 3 which is less than 7

therefore solution is acidic

and hydrogen ion concentration is 1 x 10⁻³ M

Final answer:

The energy required to heat a 5.63 g sample of solid gold from 21.0 °C to 32.0 °C is approximately 8.0239 J or 1.9174 cal, using the specific heat capacity of gold (0.129 J/g°C).

Explanation:

To calculate the energy required to heat the sample of solid gold, we can use the formula: q = mcΔT, where q is the heat energy in joules (J), m is the mass of the substance in grams (g), c is the specific heat capacity (J/g°C), and ΔT is the change in temperature in degrees Celsius (°C).

The mass m of solid gold is 5.63 g, and the specific heat capacity c of gold is given as 0.129 J/g°C. The change in temperature ΔT is (32.0 °C - 21.0 °C) = 11.0 °C.

Therefore, the energy required in joules is:
q = (5.63 g) × (0.129 J/g°C) × (11.0 °C) = 8.0239 J.

To convert joules to calories, we use the conversion factor: 1 cal = 4.184 J. Therefore,
q in calories is: q = 8.0239 J × (1 cal / 4.184 J) = 1.9174 cal.

The energy required to heat the sample of gold from 21.0 °C to 32.0 °C is approximately 8.0239 J or 1.9174 cal.

Final answer:

The %yield of Fe2O3 from the reaction of 1.0 mol of Fe with excess O2 producing 0.325 moles of Fe2O3 is calculated to be 65%, using the stoichiometric ratios from the balanced chemical equation.

Explanation:

The question involves calculating the %yield of Fe2O3 when 1.0 mole of Fe(s) reacts with excess O2(g) and produces 0.325 moles of Fe2O3. To determine the theoretical yield, we must first understand the balanced equation of the reaction, which is 4 Fe + 3 O2 → 2 Fe2O3. From this equation, we can deduce that 4 moles of Fe should ideally produce 2 moles of Fe2O3. Given that we started with 1.0 mol of Fe, the theoretical yield for Fe2O3 would be 0.5 mol, considering the stoichiometric ratios.

To find the %yield, we use the formula: (%yield) = (actual yield / theoretical yield) × 100%. Substituting the given values, we have (%yield) = (0.325 mol / 0.5 mol) × 100% = 65%. Therefore, the %yield of Fe2O3 when 1.0 mole of Fe(s) reacts with excess O2(g) to produce 0.325 moles of Fe2O3 is 65%.

Answer: The name of the given compound is tin (IV) sulfate.

Explanation:

The given compound is formed by the combination of tin ions and sulfate ions. It is an ionic compound.

The nomenclature of ionic compounds is given by:

In the given compound, tin is present in +4 oxidation state.

Hence, the name of the given compound is tin (IV) sulfate

The first stable compound produced in the light-independent reactions of photosynthesis from [tex]CO_2[/tex] is 3-phosphoglyceric acid (3-PGA), catalyzed by the enzyme RuBisCO in the stroma of the chloroplast.

The first stable compound produced from [tex]CO_2[/tex]in the light-independent reactions, also known as the Calvin cycle, is 3-phosphoglyceric acid (3-PGA). During the initial stage of fixation, which occurs in the stroma, an enzyme called ribulose bisphosphate carboxylase (RuBisCO) catalyzes the reaction of [tex]CO_2[/tex] with ribulose bisphosphate (RuBP). For each molecule of [tex]CO_2[/tex] that combines with one molecule of RuBP, two molecules of 3-PGA are produced. This step in the Calvin cycle is crucial as it marks the incorporation of inorganic carbon from [tex]CO_2[/tex] into an organic molecule, which can then be converted into glucose and other carbohydrates that are essential for plant energy and growth.

Hello! The correct answer is, B. are in motion outside the nucleus.

I hope this helped!

Within an atom, electrons are in motion outside the nucleus of an atom. The correct answer is option B.

An electron is a subatomic particle that carries a negative electric charge. It is one of the fundamental particles that make up atoms, along with protons and neutrons.

Therefore, option B. are in motion outside the nucleus, is the correct answer.

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Final answer:

Direct methods of flood control involve structural defenses like dams and levees, while indirect methods employ natural solutions, such as afforestation and wetland development, to absorb and manage water flow.

Explanation:

The difference between direct and indirect methods of flood control involves the approach taken to manage and reduce the impact of floods. Direct methods are structural solutions like levees, dams, and reservoirs that physically prevent floodwaters from reaching vulnerable areas. These methods can control the flow of water, store excess water during times of heavy rain, and are often engineered to protect specific locations.

Indirect methods include strategies like afforestation, maintaining mangrove forests, or developing wetlands, which aim to enhance the natural capacity of the environment to manage water levels without the construction of artificial barriers. Indirect methods can absorb and slow the water to reduce flooding, benefiting the ecosystem and reducing the risk of erosion on a broader scale.

Final answer:

Evaporation happens when surface liquid molecules gain enough kinetic energy to break free from intermolecular forces, turning into gas and creating vapor pressure.

Explanation:

Evaporation occurs when the molecules at the surface of a liquid gain enough kinetic energy to overcome the intermolecular forces of other molecules in the liquid phase. This physical process, known as vaporization or evaporation, involves molecules absorbing enough energy to enter the gas or vapor phase, creating what is called vapor pressure. The escape of molecules from the liquid phase to the gas phase is dependent on the molecules having a kinetic energy greater than a certain threshold. This energy helps them to overcome the attractive forces that hold them in the liquid. As temperature increases, the average kinetic energy of the molecules increases as well, leading to more molecules having the energy to vaporize.

On a practical level, we experience the effects of evaporative cooling in everyday life. For example, on a hot day, the water molecules in perspiration absorb body heat and evaporate from the surface of your skin, leaving behind a cooling sensation.

Answer:

It has no atmosphere

Explanation:

The substance that cannot be broken down by chemical change is [tex]\boxed{{\text{C) gold}}}[/tex].

Further Explanation:

Substance is the pure form of matter while a combination of atoms or molecules is termed as a mixture.

Types of substances:

1. Element

The simplest form of substance that cannot be further decomposed by any chemical means is called an element. Carbon, sulfur, and cobalt are some of the examples of elements.

2. Compound

When two or more different elements are held together by chemical methods, compounds are formed. These can further be decomposed into their corresponding constituents. The properties of compounds are very different from those of their constituent elements. NaCl, [tex]{\text{C}}{{\text{H}}_{\text{4}}}[/tex] and [tex]{{\text{H}}_{\text{2}}}{\text{O}}[/tex] are examples of compounds.

A) Butanal [tex]\left( {{{\text{C}}_4}{{\text{H}}_8}{\text{O}}} \right)[/tex] is made up of four carbon atoms, eight hydrogen atoms, and an oxygen atom so it is a compound. Therefore it can be broken down by chemical change.

B) Propene [tex]\left( {{{\text{C}}_{\text{3}}}{{\text{H}}_{\text{6}}}} \right)[/tex] is made up of three carbon atoms and six hydrogen atoms so it is a compound. Therefore it can be broken down by chemical change.

C) Gold [tex]\left( {{\text{Au}}} \right)[/tex] is an element so it is present in its simplest form. Therefore it cannot be broken down by chemical change.

D) Water [tex]\left( {{{\text{H}}_{\text{2}}}{\text{O}}} \right)[/tex] is made up of one oxygen and two hydrogen atoms so it is a compound. Therefore it can be broken down by chemical change.

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Elements, compounds, and mixtures

Keywords: substance, butanal, propene, gold, water, element, compound, chemical change, decomposed, simplest form, NaCl, CH4, carbon, sulfur, cobalt.

Gold, being an element, cannot be broken down further by a chemical change whereas butanal, propene, and water, being compounds, can be.

The substance which cannot be broken down by a chemical change is gold. This is because gold is an element. Elements are pure substances that are made from a single type of atom and cannot be broken down further by chemical methods. On the other hand, butanal, propene, and water are all compounds, which are substances formed when two or more chemical elements are chemically bonded together. Compounds can be decomposed into simpler substances, or their constituent elements, by chemical change.

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The arrangement of particles in a gas differs from that in a solid in that they are farther apart, allowing gases to fill their containers' volume and shape.

How does the arrangement of the particles in a gas compare to that of a solid? The correct answer is that the particles in a gas are farther apart than the particles in a solid (Option C). This difference in particle arrangement is crucial for understanding the distinct physical properties of solids, liquids, and gases.

Solids and liquids are considered condensed phases because their particles are very close together, which leads to them having definite volumes. Conversely, the particles in a gas phase are much more spread out, allowing them to move freely at high speeds. This significant separation between particles in a gas means that a gas can expand to fill the shape and volume of its container, differentiating it notably from solids and liquids.

The given chemical reaction is:

Mg + Cl₂ → Mg²⁺ + 2Cl⁻

The reaction can be broken down into two half-reactions as follows:

Mg → Mg²⁺ + 2e⁻  ------(1)

Cl₂ + 2e⁻ → 2Cl⁻   ------(2)

Reaction (1) is an oxidation reaction as it involves loss of electrons.

Reaction (2) is reduction reaction as it involves gain of electrons.

The oxidation state of Mg changes from 0 (Mg) to +2 (Mg2+). Hence, Mg is the oxidized substance

Answer:

Mg

Explanation:

Edge

Answer:

The entropy change for combining the two temperatures of water is 2.9 J/K.  

Hope I helped!!! :)

B. is indeed correct

If 2.34 g of NaCl was formed, the number of moles of NaHCO3 must have been used in the reaction is 0.0800 mol

To determine the number of moles of NaHCO3 that must have been used in the reaction, we need to use the balanced chemical equation and the given mass of NaCl.

The balanced chemical equation for the reaction is: 2 NaHCO3 + H2SO4 → 2 CO2 + Na2SO4 + 2H2O

From the balanced chemical equation, we can see that there is a one-to-one ratio between NaCl and NaHCO3.

Therefore, the number of moles of NaHCO3 used in the reaction is the same as the number of moles of NaCl formed.

To find the number of moles of NaHCO3, we need to convert the mass of NaCl to moles using the molar mass of NaCl.

The molar mass of NaCl is 58.44 g/mol (22.99 g/mol for Na + 35.45 g/mol for Cl).

Let's assume that x moles of NaHCO3 were used in the reaction.

From the balanced chemical equation, we know that 2 moles of NaHCO3 react to form 2 moles of CO2.

Therefore, the molar ratio between NaHCO3 and CO2 is 2:2.

Since we have found that there are 2.34 g of NaCl formed, we can now set up the following equation:

x moles NaHCO3 = 2.34 g NaCl × (1 mol NaCl/58.44 g NaCl) × (2 mol NaHCO3/2 mol NaCl)

Calculating this, we get:

x = 0.0800 mol

So therefore the number of moles of NaHCO3  is 0.0800 mol