very small particles can be removed from drinking water by: a. sand filtering. b. use of activated charcoal. c. all of these are correct. d. both sand filtering and use of activated charcoal.

Heat is transferred from the sun to the sand by radiation, from the sand to the feet by conduction, and from the feet to the water by convection.

Heat is transferred by 3 methods depending on the molecule:

Heat waves travel through the air to heat up the sand, a radiational process. Walking across the hot sand on the beach, heat from the sand will get transferred to your feet by conduction because your feet are solid.

When you place your feet into the cold beach water, a convectional current helps transfer the heat from your feet to the water.

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If you use Copper (Cu) as the metal , Oxygen (O) and Carbon (C) as the c, then you can make 2 new compounds in five minutes.

The two possible compounds are:

Copper oxide (CuO) is a chemical compound composed of copper and oxygen. It is a black, solid material with a high melting point and is commonly referred to as cupric oxide or black oxide of copper.

CuO can be produced by heating copper in the presence of oxygen, or by reacting copper sulfate with sodium hydroxide. It is commonly used as a raw material in the production of copper salts, in the manufacturing of ceramics, as a pigment, and as a catalyst in various chemical reactions.

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Answer:

pressure of the gas in kPa = 133.75 Kpa

Explanation:

Given:

To find:

Pressure of gas in KPa = ?

Solution:

From ideal gas equation,

PV = nRT

P × 8 L = 0.5 mol × 0.082 L.atm/K.mol × 257.6 K

P = 1.32 Atm

We know that 1 atm = 101.32 K Pa

1.32 Atm = 1.32×101.32 Kpa = 133.75 Kpa

P = 133.75 Kpa

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Answer:

The correct answer is - D C2H4.

Explanation:

Saturated hydrocarbons are hydrocarbons with single covalent C-C bonds. They are known as alkanes. The general formula for these hydrocarbons is  CnH2n+2

Unsaturated hydrocarbons the hydrocarbons with double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is  CnH2n and CnHn-2

For the given options:

Option D: C2H4, is the simplest alkene with a double bond so it is an unsaturated hydrocarbon.

The chemical equation for the reaction is for preparation of barium sulfate is, Ba(NO₃)₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaNO₃(aq).

Barium sulfate can be prepared in the laboratory by mixing a solution of barium nitrate (Ba(NO₃)₂) with a solution of sodium sulfate (Na₂SO₄) to form a precipitate of barium sulfate (BaSO₄), which can then be filtered and dried. The balanced chemical equation for the reaction is:

Ba(NO₃)₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaNO₃(aq)

In this reaction, the barium and sodium ions switch partners to form insoluble barium sulfate and soluble sodium nitrate. The state of matter of each compound is indicated in parentheses: (aq) for aqueous (dissolved in water) and (s) for solid (precipitate).

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solids are similar to liquids in that both are condensed states, with particles that are far closer together than those of a gas. However, while liquids are fluid, solids are not. The particles of most solids are packed tightly together in an orderly arrangement. The motion of individual atoms, ions, or molecules in a solid is restricted to vibrational motion about a fixed point. Solids are almost completely incompressible and are the densest of the three states of matter.

When the mixture of water and rubbing alcohol are put in an open flask and the temperature is increased while keeping the pressure same the rubbing alcohol will vaporize at a faster rate.

The mixture of water and rubbing alcohol is a homogeneous mixture.

When the temperature of the flask is increased in which the mixture of water and rubbing alcohol is put the kinetic energy of the molecule associated with the mixture is increased at a very higher rate.

As we are keeping the flask in a place of the region of atmospheric pressure so we can assume that the pressure will always remain the same.

As a result the rubbing alcohol starts to evaporate at a much higher rate even before reaching the boiling point.

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 Given reaction emits heat since it is exothermic. We must examine the Le Chatelier principle in order to foretell the reaction's direction. Since they are present on the product side, adding NH3 or H2O to the reaction mixture will cause the equilibrium to move towards the products.

On the other hand, eliminating NO or O2 will tip the balance in favour of the reactants. As the temperature rises, the endothermic reaction is more likely to occur, shifting the equilibrium in favour of the products.

The equilibrium will shift towards the side containing fewer moles of gas, or the product side, when the pressure is reduced. Since a catalyst speeds up both the forward and backward processes equally, it has no effect on the equilibrium. Adding an inert gas would only result in an increase in pressure, not a decrease.

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Answer:

Hence

potassium (k) is 2,8,8,1

sodium (Na) is 2,8,1

potassium will have a higher Ionic radius than sodium

Explanation:

Ionic radius has a trend

it increases down the group

and decreases across the period

Answer:

A. The acid and base would neutralize to form an element.

Answer:

egc jnpz rof join it on google meet

Answer:

25.91 L

Explanation:

P1V1= P2V2

748 (26.5) =  765 ( V2)      V2 = 25.91 LITERS  

When the arrangement of atoms changes in a substance, the properties of the substance can change as well. The different arrangements of atoms can lead to different chemical and physical properties.

For example, if the atoms of a substance are rearranged to form a new compound, the new compound will have different chemical properties than the original substance. A new compound may have a different color, odor, reactivity, or melting point than the original substance.

Changing the arrangement of atoms without changing the chemical composition can change the physical properties. For example, a crystalline solid has atoms or molecules arranged in a regular, repeating pattern. This arrangement gives the material unique properties such as density, melting point, and hardness. If the arrangement of atoms and molecules changes, the properties of solids can also change.

In summary, when the arrangement of atoms in a substance changes, the properties of the substance can also change. Different arrangements of atoms have different chemical and physical properties.

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Abundant sunlight did not play a major role in the formation of fossil fuels from plant matter; instead, factors such as high temperatures, an absence of oxygen, and high pressures were key in their formation.

The factor that did not play a major role in the formation of fossil fuels from plant matter is B) abundant sunlight. Fossil fuels, such as coal, oil, and natural gas, are formed from the remains of ancient plants and organisms that were buried and subjected to intense heat and pressure over millions of years. During this process, organic material undergoes biochemical and geological changes, resulting in the formation of fossil fuels.

While abundant sunlight is essential for the growth of plants through photosynthesis, it does not directly contribute to the formation of fossil fuels. Instead, the key factors in their formation are high temperatures, an absence of oxygen (anaerobic conditions), and high pressures. These conditions are typically found deep underground, where plant matter gets buried and subjected to geological processes.

High temperatures facilitate the thermal decomposition of organic compounds, converting them into hydrocarbons. An absence of oxygen prevents complete combustion and allows the accumulation of carbon-rich materials. High pressures help compress the organic matter, promoting chemical reactions and transforming it into dense energy-rich substances like coal, oil, and natural gas.

In summary, while abundant sunlight is crucial for plant growth, it is not a direct factor in the formation of fossil fuels. The key factors involved are high temperatures, an absence of oxygen, and high pressures during the geological processes of burial and transformation.

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Answer:

The equilibrium constant (Keq) for a reaction is a measure of the relative concentrations of the products and reactants at equilibrium. The equation for the equilibrium constant (Keq) is:

Keq = [H2O(g)][CO(g)] / [H2(g)][CO2(g)]

In order to find the Keq, we need to substitute the equilibrium concentrations of the species into the equation.

At equilibrium, there are 0.106 moles of H2, 0.106 moles of CO2, 0.094 moles of water and 0.094 moles of CO.

Keq = [0.094 moles H2O][0.094 moles CO] / [0.106 moles H2][0.106 moles CO2]

By canceling out the moles unit and substituting the number we got the value of Keq as:

Keq = 0.0940.094 / 0.1060.106

Keq = 0.87

Therefore, the Keq for this reaction is 0.87.

It is worth to note that the temperature, pressure and volume don't affect the Keq value but they affect the position of equilibrium.

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Answer:

A: true.

B: true.

C: false

D: true.

Explanation:

Light is an electromagnetic wave which travels regardless of whether there is medium. sound is a wave disturbance in medium meaning it must have matter. Also light is much faster then sound.

Answer:

I'm terribly sorry but the download is not working for me! All it says is Download pdf, and when I click it, It does nothing except for refreshing the page!

Explanation:

Type of force would put the soccer ball in motion is unbalanced force.

Unbalanced force is  defined as when the net force acting on the object is not equal to zero. The unbalanced force brings an object in motion. while balanced force acting on any object does not change the state of rest or uniform motion. The soccer ball moves from one place to another because unbalanced forces are acting on the soccer ball. this means the resultant force acting on soccer ball is not equal to zero.

Thus, Type of force would put the soccer ball in motion is unbalanced force.

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Answer:

b) Unbalanced force

Explanation:

Unbalanced force is the type of force which puts the soccer ball in motion while kicking it. Hence, option (b) is the correct answer.

Answer:

2.34 x 10⁻⁹ m  

Explanation:

To find the wavelength, you need to use the following equation:

λ = c / f

In this equation,

-----> λ = wavelength (m)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> f = frequency (Hz or s⁻¹)

You can find the wavelength by plugging the given value and constant into the equation and solving for "λ". The final answer should have 3 sig figs like the given value (1.28 x 10¹⁷ = 3 sig figs).

λ = c / f                                                             <----- Given Equation

λ = (3.00 x 10⁸ m/s) / (1.28 x 10¹⁷ Hz)              <----- Insert variables

λ = 2.34 x 10⁻⁹ m                                            <----- Divide

Answer:  d. Cyolite

Explanation:

a.bauxite   - Aluminum ore ✅

b.haematite - Iron ore  ✅

c.calamine - an ore of zinc  ✅

d.cyolite​ -   ❌  the ore is cryolite

✅ - is an ore

❌ - not an ore

A piano contains both mechanical and acoustic energy. Mechanical energy is created when you press a key; as a result, the strings vibrate when the hammer strikes them, producing sound.

What converts thermal energy to electrical energy?

Using a thermoelectric generator, thermal energy can be transformed into electrical energy.

What is thermal energy?

The term "thermal energy" is used a lot of different ways in physics and engineering. It may be related to a number of different physical concepts.

What is electric energy?

Electrical energy is related to forces on electrically charged particles and the motion of electrically charged particles, frequently electrons in wires.

Hence mechanical and acoustic energy is a correct answer.

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A CRM system can help a building supply company manage their many high volume and low-volume customers more effectively.

By tracking customer interactions and purchases, a CRM system can help identify trends and opportunities for upselling or cross-selling to both types of customers.

Additionally, a CRM system can help a company provide more personalized and efficient customer service by allowing representatives to quickly access customer information and preferences.

This can lead to increased customer loyalty and satisfaction, as well as improved sales and profitability for the company.

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Increasing the concentration of Zn2+ will not directly affect the standard reduction potential, Increasing the concentration of Pb2+ will not directly affect the standard reduction potential, Increasing the mass of Zn will not affect the standard reduction potential, Decreasing the mass of Zn would reduce the amount of Zn available

To determine which change would cause the cell potential to increase, we need to consider the half-reactions occurring at each electrode and the standard reduction potentials.

In the given galvanic cell:

Anode (oxidation): Zn(s) → Zn2+(aq) + 2e-

Cathode (reduction): Pb2+(aq) + 2e- → Pb(s)

The standard reduction potentials for these half-reactions are as follows:

E°(Zn2+/Zn) = -0.76 V

E°(Pb2+/Pb) = -0.13 V

The overall cell potential (Ecell) is calculated by subtracting the anode potential from the cathode potential:

Ecell = E°cathode - E°anode

To increase the cell potential (Ecell), we need to make it more positive. This can be achieved by increasing the cathode potential or decreasing the anode potential.

Considering the given options:

a) Increasing the concentration of Zn2+ (increasing [Zn2+]) will not directly affect the standard reduction potential or the cell potential. It may affect the reaction rate, but it won't change the inherent potential difference between the half-reactions.

b) Increasing the concentration of Pb2+ (increasing [Pb2+]) will not directly affect the standard reduction potential or the cell potential. Similar to the previous option, it may affect the reaction rate but not the inherent potential difference.

c) Increasing the mass of Zn (increasing the amount of Zn) will not affect the standard reduction potential or the cell potential. The amount of Zn doesn't alter the inherent potential difference between the half-reactions.

d) Decreasing the mass of Zn (decreasing the amount of Zn) would reduce the amount of Zn available for the reaction. This change would not affect the standard reduction potential or the cell potential significantly.

Therefore, none of the given options would directly cause the cell potential to increase. The cell potential is determined by the standard reduction potentials of the half-reactions involved and is not significantly affected by changes in the concentration or mass of the species involved.

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Answer: D. An increase in entropy

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an disordered arrangement to an ordered arrangement, the entropy is said to increase and vice versa.

For a reaction to be spontaneous, the enthalpy of the solution must decrease and the entropy must increase.

To overcome a positive enthalpy of solution and allow a solid  solute to dissolve in water, an increase in entropy would make the reaction spontaneous as the system would move to a more disordered state.

The dissociation curve of hemoglobin is influenced by various factors, including the partial pressure of carbon dioxide, temperature, pH, and the presence of 2,3-DPG.

High partial pressure of carbon dioxide (CO2): An increase in the partial pressure of carbon dioxide shifts the dissociation curve to the right. This is known as the Bohr effect. Elevated CO2 levels indicate increased metabolic activity or higher levels of carbon dioxide produced during respiration. The shift to the right allows for more efficient release of oxygen from hemoglobin in tissues where oxygen demand is high.

Increasing temperature: An increase in temperature also shifts the dissociation curve to the right. Higher temperatures typically occur in metabolically active tissues, where oxygen demand is increased. The shift to the right enhances the unloading of oxygen from hemoglobin, facilitating oxygen delivery to the tissues.

Decreasing pH (acidic conditions): A decrease in pH, resulting in increased acidity (e.g., during exercise or in tissues with high metabolic rates), causes a rightward shift of the dissociation curve. This phenomenon is also known as the Bohr effect. The decrease in pH decreases the affinity of hemoglobin for oxygen, facilitating oxygen unloading in acidic environments.

Presence of 2,3-Diphosphoglycerate (2,3-DPG): 2,3-DPG is a molecule that is present in red blood cells and helps regulate the affinity of hemoglobin for oxygen. Higher levels of 2,3-DPG, which can occur in conditions such as chronic hypoxia or anemia, shift the dissociation curve to the right. This shift allows for more efficient unloading of oxygen from hemoglobin, ensuring that oxygen is delivered to tissues in need.

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Heat is chosen to be positive when it enters a system and negative when it exits, represented by the symbol Q and unit Joule. The temperature difference between two bodies causes heat flow.

The amount of heat per unit of temperatures in a system that cannot be used to carry out beneficial work is known as entropy. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.

All spontaneous shifts in an isolated system, according to the entropy principle, occur in the direction of growing entropy. These transformations can be seen in the dispersion of gradients or the evaporation of lots of energy into low-grade energy, which eventually turns into heat energy.

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Answer:

525.1 g of BaSO₄ are produced.

Explanation:

The reaction of precipitation is:

Na₂SO₄ (aq) + BaCl₂ (aq) →  BaSO₄ (s) ↓  +  2NaCl (aq)

Ratio is 1:1. So 1 mol of sodium sulfate can make precipitate 1 mol of barium sulfate.

The excersise determines that the excess is the  BaCl₂.

After the reaction goes complete and, at 100 % yield reaction, 2.25 moles of BaSO₄ are produced.

We convert the moles to mass: 2.25 mol . 233.38 g/mol = 525.1 g

The precipitation's equilibrium is:

SO₄⁻² (aq)  +  Ba²⁺ (aq)  ⇄  BaSO₄ (s) ↓       Kps

525.1 0 g of BaSO₄ are produced.  

The reaction of precipitation is:

Na₂SO₄ (aq) + BaCl₂ (aq) →  BaSO₄ (s) ↓  +  2NaCl (aq)

Ratio is 1:1. So 1 mol of sodium sulfate can make precipitate of 1 mol of barium sulfate.

Molar mass of \(BaSO_4\) is 233.38 g/mol

The formula for the number of moles is as follows:-

\(Number\ of\ moles=\frac{Mass}{Molar\ Mass}\)

\(Mass=2.25\ moles\times233.38\ g/mol\\=525.10\ g\)

So, 525.10 g of barium sulfate be precipitated.

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In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals