22. The metal roof of a building has turned a light green colour. The metal roof is most likely

Answer:B

Explanation:

Answer:

............

Explanation:

Explanation:

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The three mixtures can be separated by using magnets, by the process of evaporation and by sublimation.

Generally, mixtures can be physically separated by using methods that uses the differences in physical properties in order to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography. Separation techniques are defined as those techniques that can be used to separate two different states of matter such as liquid and solid.

Mixture of iron fillings and sand can be easily separated by magnets.

Mixture of salt and water can be separated by evaporation.

Mixture of nickel-dust, ammonium chloride and stone-dust can be easily separated nickel by magnet and the ammonium chloride by sublimation.

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Answer:

Ketones and ketoacids are alternative fuels for the body that are made when glucose is in short supply. They are made in the liver from the breakdown of fats. Ketones are formed when there is not enough sugar or glucose to supply the body's fuel needs. This occurs overnight, and during dieting or fasting.

Explanation:

The bond between hydrogen (H) and oxygen (O) (option 3: H-O) has the highest electronegativity difference (1.24). Therefore, the H-O bond is the most polar among the given choices.

The polarity of a chemical bond depends on the electronegativity difference between the two atoms involved. The greater the electronegativity difference, the more polar the bond.

Let's compare the given bond options:

(1) C-O: The electronegativity of carbon (C) is approximately 2.55, and the electronegativity of oxygen (O) is approximately 3.44. The electronegativity difference is 0.89.

(3) H-O: The electronegativity of hydrogen (H) is approximately 2.20, and the electronegativity of oxygen (O) is approximately 3.44. The electronegativity difference is 1.24.

(2) F-F: Fluorine (F) is the most electronegative element with an electronegativity of 3.98. Since both atoms in this case are fluorine, the electronegativity difference is 0.

(4) N-H: The electronegativity of nitrogen (N) is approximately 3.04, and the electronegativity of hydrogen (H) is approximately 2.20. The electronegativity difference is 0.84.

From the options provided, the bond between hydrogen (H) and oxygen (O) (option 3: H-O) has the highest electronegativity difference (1.24). Therefore, the H-O bond is the most polar among the given choices.

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The structural formula of butanol is C4H9OH. It consists of a chain of four carbon atoms, with a hydroxyl (-OH) group attached to one of the carbon atoms. Butanol has several structural isomers, which have the same molecular formula but different structural formulas.

A structural isomer is a compound that has the same molecular formula as another compound but has a different arrangement of its atoms. A string of 4 C atoms are bonded above, below, left, and right to H, except the second C, which is bonded below to O, which is bonded below to H is a structural isomer of butanol.

This is called butan-2-ol. The structural formula of butan-2-ol is CH3CH(OH)CH2CH3. In this isomer, the hydroxyl group is attached to the second carbon atom in the chain, whereas in butanol, the hydroxyl group is attached to the first carbon atom in the chain.

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According to the forces of attraction, water has highest boiling point as it possesses hydrogen bonding.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Mount Etna I believe

Explanation:

Answer:

People get minerals out of the ground by digging it. They use machines to also help them dig faster.

Answer:

The primary method used to extract minerals from the ground are:

Underground mining, surface (open pit) mining. Placer mining...

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Answer:

A. The actual number of atoms in a molecule

Explanation:

Molecular formula is simply defined as a type of chemical formula that describes the type and number of atoms present in a single molecule of a compound.

Looking at the options, the correct answer is option A.

Answer:

a

Explanation:

The mass of nitroglycerin : 34.52 g

Reaction

4C₃H₅N₃O₉ ⇒ 12 CO₂ + 10H₂O + 6N₂ +O₂

Volume = 10 L

Temperature = -5°C=268 °K

Pressure = 1 atm

mol of CO₂ (ideal gas) :

\(\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1\times 10}{0.082\times 268}\\\\n=0.455\)

mol ratio C₃H₅N₃O₉ : mol CO₂= 4 : 12, so mol C₃H₅N₃O₉ :

\(\tt \dfrac{4}{12}\times 0.455=0.152\)

mass C₃H₅N₃O₉ (MW=227,0865 g/mol):

\(\tt 0.152\times 227.0865=\boxed{\bold{34.52~g}}\)

Answer:

See answer below

Explanation:

In order to do this, we need to use the following expression:

N'Au = C'Au * NAu  (1)

Where:

N'Au: number of gold atoms per cubic centimeter.

C'Au = Atomic percentage of the Gold in the gold silver alloy.

NAu = Number of gold atoms

However, we do not have C'Au and neither NAu. We need to calculate those first.

To get the percentage of the gold we use the following expression:

C'Au = (CAu * MMAg) / (CAu * MMAg + CAg * MMAu)   (2)

Where:

CAu and CAg: Weight percentage of the gold and the silve

MMAu and MMag: Atomic weights of the gold and the silver

We already have that data, so, replacing all the given data into (2) we have:

C'Au = (0.10 * 107.87) / (0.10 * 107.87 + 0.90 * 196.97)

C'Au = 10.787 / 188.06

C'Au = 0.0574  (or 5.74%)

We have C'Au, now we need to find the number of atoms of gold in the gold silver alloy. In order to do that, we use the following expression:

NAu = N * ρ / MMAu    (3)

N is the avogadro's number which is 6.02x10²³ atoms. So replacing this value, the density and molecular weight of gold, the atoms are:

NAu = 6.02x10²³ * 19.32 / 196.97

NAu = 5.9x10²² atoms/cm³

Now that we have all the required data from (1), we just need to replace the obtained values:

N'Au = 5.9x10²² * 0.0574

N'Au = 3.39x10²¹ atoms/cm³

Hope this helps

The blood pH would turn more alkaline

There is more bicarbonate ions in the blood

The equilibrium would have to shift to the left

Hyperventilation is a condition in which a person breathes rapidly and deeply, leading to a decrease in the concentration of carbon dioxide (CO2) in the blood. This causes a shift in the balance of the carbonic acid-bicarbonate buffer system in the blood, which can affect the pH of the blood.

The carbonic acid-bicarbonate buffer system is an important mechanism that helps regulate the pH of the blood. It involves the equilibrium between carbonic acid (H2CO3) and bicarbonate ions (HCO3-) in the blood:

H2CO3 ⇌ H+ + HCO3-

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Answer

What happens is that the iron will displace the Cu²⁺ from the copper sulfate solution. The following is the chemical equation for the reaction.

Fe + CuSO₄ → FeSO₄ + Cu

(i) This reactivity series helps us understand this displacement reaction taking place. The reactivity series is a series of metals, in order of reactivity from highest to lowest. It is used to determine the products of single displacement reactions, whereby a metal e.g Fe will replace another metal e.g Cu in a solution if the former is higher in the series than the latter.

Hence, the surface of the iron nail will have a brown coating of copper formed on it, and the color of the copper sulfate solution which was initially blue changes to light green.

The reactivity series is otherwise called the activity series. The figure is the reactivity series of metals.

Answer:

a

Explanation:

Because they have a limited of thing so they have to reuse resources

Because people have unlimited wants and limited resources, they must recycle and reuse resources. The correct options are a.

Resources are things that can be used by an individual or organization to carry out plans and projects. Resources can be natural things and artificial things, like money, raw material, and vehicles. Resources help people to run their life with all peace and ease.

Recycling is the process of gathering and converting resources into new goods that would otherwise be thrown away as waste. Your community and the environment may both benefit from recycling.

The resources are limited on earth and human consumption is increasing day by day. So to proper use of resources, we must reuse and recycle the resources.

Thus, the correct options are a. recycle and reuse resources.

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Answer:

The correct answer is - exothermic reaction.

Explanation:

Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.

In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.

The balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

A redox reaction is a type of chemical reaction in which some of the atoms have their oxidation number changed.

According to this question, the redox reaction between zinc and hydrochloric acid (HCl) forms zinc(II) ions and hydrogen gas. The balanced equation is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

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The Ksp of SrCO3 is obtained as 1.6 * 10^-9.

The kind of salt used and the temperature of the solution both affect Ksp's value. It offers details on the maximum quantity of salt that can dissolve in the solvent under a specific set of circumstances.

A solution is referred to as supersaturated and the excess ions may precipitate out of solution if the concentration of the ions in it exceeds the value of Ksp.

We know that the Ksp for the SrCO3(s) can be obtained from;

Ksp = [Sr^2+] [CO3^2-]

Ksp = x^2

But  [Sr^2+] = [CO3^2-] = 4 * 10^-5 M = x

Thus;

Ksp = (4 * 10^-5)^2

= 1.6 * 10^-9

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Answer:

4.2 mL

Explanation:

To make the problem more interesting, let's assume that you don't know the formula for dilution calculations.

The idea with diluting a solution is that the number of moles of solute will remain constant after the initial solution is diluted. The only thing that changes in such cases is the volume of the solution.

2. The pH is 4.22 × 10⁸. 3. pH is 7, 4. pOH is 9.7, 5. diprotic is explained below, 6. Amphoteric is explained below, 7. pH meter, 8. A buffer solution is explained below, 9. Titration is explained below, 10. Difference between strong and weak acids is explained below.

2. pH = -log[H⁺]

pH = -log(4.22 x 10⁻⁸)

pH ≈ 7.375

3. pH + pOH = 14

pH + 7 = 14

pH = 14 - 7

pH = 7

4. pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 4.3

pOH ≈ 9.7

Now,

[H⁺] × [OH⁻] = 1.0 x 10⁻¹⁴

[OH⁻] = 1.0 x 10⁻¹⁴ / [H⁺]

[OH⁻] = 1.0 x 10¹⁴ / 10^(-pOH)

[OH⁻] = 1.0 x 10⁻¹⁴ / 10^(-9.7)

[OH⁻] ≈ 1.99 x 10⁻⁶ M

5. Being diprotic means that a molecule or ion can donate or release two protons (H⁺ ions) in an acid-base reaction.

6. Amphoteric refers to a substance that can act as both an acid and a base.

7. The pH can be measured using a pH meter or a pH indicator.

8. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it.

9. Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration (titrant) of another substance.

10. A strong acid is an acid that completely ionizes in water, releasing all of its hydrogen ions. A weak acid is an acid that does not completely dissociate into ions when dissolved in water.

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try and find a better answer or ask ur teacher please

Answer:

c

Explanation:

By focusing on certain fields, precision management can assist farmers in using less fertiliser. Option D is the right choice as a result.

In 1994, Precision Management was founded with the express purpose of offering customers comprehensive, effective, and personalised property management services while concentrating on and achieving their goals and objectives. Precision has developed friendships as well as commercial ties during the past 25 years. Our clients value Precision's distinctive, hands-on management approach and the company's overall commitment to their assets. By focusing on certain fields, precision management can assist farmers in using less fertiliser.

Therefore, the correct option is option D.

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

C. Speed

Explanation:

Density differences in different materials are able to change the speed of a wave.

Answer:

Speed

Explanation:

The speed or mass of something can totally change the direction of the wave

1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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C. 51.5%  is the percent yield for the reaction below when 364 g SO2 and 42.0 g O2 produce 408 g SO3

The actual yield is determined by calculating the quantity of the product created. We can estimate the percentage yield by dividing the actual yield by the theoretical value. The percentage yield is the difference between the quantity of product that was actually created and the maximum calculated yield.

2SO₂(g) + O₂(g) → 2SO3(g)

SO₂ mass => 364g

O₂ mass => 42g

SO3 mass => 408g

Theoretical yield of SO3:

mole of  O₂ => 42g/32g => 1.31

according to the chemical equation:

1 mole of oxygen => 2 moles of SO3

1.31 mole O2 => x moles of SO3

x=> 2 x 1.31 => 2.62

Hence, the mass of SO3 => 2.62 x 80.06 => 209.75g

The percentage of yield => Actual yield / theoretical yield x 100

                                  => 209.75/408 x 100 => 51.45 => 51.5%

The theoretical yield is the yield that is derived using a balanced chemical reaction. What you actually acquire from a chemical reaction is the actual yield.

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The best explanation for the increase in the number of plants with long, narrow flowers over time is option D: Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.

In this population, short, wide flowers are better suited for bee pollination, while long, narrow flowers are more suitable for hummingbird pollination. Over time, the plants with long, narrow flowers produce more seeds compared to those with short, wide flowers.

This happens because the hummingbirds, which are the main pollinators for long, narrow flowers, are more effective in transferring pollen between these flowers. As a result, the long, narrow flower individuals have a higher reproductive success and pass on their traits to the next generation

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Answer:

Neutrons and protons

Explanation:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).