why is it difficult to classify hydrogen was a metal or non metal

Answer:

90^0.

Explanation:

The bond angle in H2O is 105^0 and in H2S it is 90^0.

Answer:

Explanation:

what?

Like charges repel each other, while opposite charges attract each other. This principle is one of the fundamental aspects of electrostatics. According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

As the distance between two charged particles decreases, the force between them increases. This is because the closer the particles are, the stronger the electric field they create, leading to a stronger force of interaction.

On the other hand, as the magnitude of the charges decreases, the force between the particles also decreases. This is because the force is directly proportional to the product of the charges. If one or both of the charges are smaller, the force they exert on each other will be weaker.

In summary, according to Coulomb's law, decreasing the distance between charged particles increases the force between them, while decreasing the magnitude of the charges decreases the force. This understanding of the relationship between charge, distance, and force is crucial in explaining the behavior of charged particles and the interactions between them.

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To plot the calibration curve, you need to prepare iron solutions with known concentrations and measure their absorbance. You need to pipet 0 mL of the diluted solution to have 0.00 mg of iron.

In spectrophotometry, to plot the calibration curve, you need to prepare solutions with known concentrations and measure their absorbance.

We have a standard iron solution with a concentration of 0.2500g/L of pure iron (C₁). We pipet 25.00mL (V₁) of this standard iron solution into a 500mL (V₂) volumetric flask and dilute up to the mark with distilled water.

We can calculate the concentration of the diluted solution (C₂) using the dilution rule.

\(C_1 \times V_1 = C_2 \times V_2\\\\C_2 = \frac{C_1 \times V_1}{V_2} = \frac{0.2500 g/L \times 25.00 mL}{500 mL} = 0.0125 g/L\)

Then, if we wanted to prepare the blank, that is, the solution that contains the same matrix but not the analyte, and whose concentration in iron is 0.00 mg/L, we wouldn't pipet any of the diluted solution.

To plot the calibration curve, you need to prepare iron solutions with known concentrations and measure their absorbance. You need to pipet 0 mL of the diluted solution to have 0.00 mg of iron.

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Ionic and Covalent Bonds- The materials utilized during the experiment, the steps taken, and the techniques used to analyze the results should all be described in the section titled "Materials and Methods."

A lab report is broken down into eight sections: title, abstract, introduction, techniques and materials, results, discussion, conclusion, and references. The title of the lab document must be descriptive of the scan and replicate what the scan analyzed.

Ionic bonds require an electron donor, the metal, and an electron accepter, the non-metal. Covalent bonding is the sharing of electrons between atoms. This kind of bonding happens between two of the equal element or elements shut to each other in the periodic table.

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The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

pollution causes smog

Smoke fog, or smog for short, is a type of intense air pollution.

it makes GHG wich is greenhouse gas and it makes the smog to stay inside the earth wich heats the Earth and it causes flood, storm, tornadoes, ect.

Answer:

24 g of carbon

Explanation:

Methane is produced by this reaction:

C(s) + 2H₂(g) →  CH₄ (g)

At STP 1 mol of any gas is contained at 22.4L. Let's see how many moles are contained at 44.8L

(1L = 1dm³)

44.8 L . 1mol / 22.4L = 2 moles

Stoichiometry at reaction is 1:1.

1 mol of methane is produced by 1 mol of carbon.

In conclussion, 2 moles of gas may come from 2 moles of C.

We determine the mass:

2 mol . 12 g /mol = 24 g

Answer:

Power plants are not located in cities. Power has to travel a long distance over power lines to reach cities.

Explanation:

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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Yes, that statement is generally correct. A scientific law is a statement that describes a phenomenon or pattern in nature, often expressed mathematically, without attempting to explain why it occurs. A scientific theory, on the other hand, is a well-substantiated explanation for a set of phenomena, based on empirical evidence and scientific reasoning.

A scientific law summarizes what happens in a particular situation, often in the form of an equation or formula, whereas a scientific theory attempts to explain why it happens.

For example, the law of gravity describes the attraction between masses, but it does not explain why this attraction occurs. In contrast, the theory of general relativity attempts to explain the underlying principles of gravity, including its effects on the curvature of space-time.

It's worth noting that both scientific laws and scientific theories are based on empirical evidence, but they serve different purposes in scientific inquiry. Laws describe what happens in a particular situation, while theories attempt to explain why it happens.

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Answer:

unbalanced forces can cause an object to move.

Explanation:

Answer:

The change in enthalpy when one mole of a material is created from its pure components under the same conditions—1 atm of pressure and 298.15 K—is known as the standard enthalpy of formation.

Explanation:

The energy released or absorbed when one mole of a material is formed under typical circumstances from its pure constituents is measured by the standard enthalpy of formation.

The following equation represents the typical use of the standard enthalpy change of formation (originating from the fact that enthalpy is a state function):

\(\Delta H_{reaction}^o = \sum {\Delta H_{f}^o(products)} - \sum {\Delta H_{f}^o(Reactants)}\)

The standard enthalpy shift of formation is determined by subtracting the total of the conventional enthalpies of formation of the reagents from the total of the normal enthalpies of formation of the constituents.

The standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.

Enthalpy is the heat energy that is being absorbed or evolved during the progression of a chemical reaction.

The enthalpy is given the symbol H. H indicates the amount of energy. The change of enthalpy is given as ∆H, and the symbol ∆ indicates the change of enthalpy.

The heat of formation is a form of enthalpy. heat of formation is the amount of energy either absorbed or released during the formation of a compound

The mass of 3.45 moles of NH₄NO₃ is 276.14g.

The mass of a substance can be calculated by multiplying the number of moles in that substance by its molar mass as follows:

mass = no of moles × molar mass

Moles is the amount of substance of a system which contains exactly 6.02214076 × 10²³ elementary entities such as atoms, ions, molecules, etc.

The molar mass of NH₄NO₃ = 80.043 g/mol

mass = 3.45 mol × 80.043 g/mol

mass = 276.14g

Therefore, 276.14g is the mass contained in 3.45 moles of ammonium nitrate.

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Answer:

2 moles

Explanation:

In this reaction, the stoichiometry (mole ratio) is 1 mole of sulfuric acid reacting with 2 moles of sodium hydroxide (1:2 ratio)

Answer:

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Explanation:

Hopefully this is what you needed

Answer:

Universal indicator can show us how strongly acidic or alkaline a solution is, not just that the solution is acidic or alkaline. This is measured using the pH scale , which runs from pH 0 to pH 14.

Explanation:

~Hope this helps

Answer:

C. A tablet contains different chemical compounds

Explanation:

The dietary supplement in this question depicts a kind of matter. Matter, in chemistry, can either be a pure substance or a mixture. Unlike elements and compounds (pure substances) which cannot be separated by physical means, mixtures can be separated using physical method.

A mixture is a combination of different substances with varying physical properties, which serves as basis of their physical separation. According to the image in the question, the Calcium citrate dietary supplement contains different chemical compounds like polyethylene glycol, sodium, methyl cellulose, magnesium silicate etc.

These chemical compounds retain their individual properties and can be separated easily via physical techniques, hence, the dietary supplement is a MIXTURE.

First, we need to write out the balanced chemical equation for the reaction: 4 KO2 + 2 CO2 → 2 K2CO3 + 3 O2

From the equation, we can see that 4 moles of KO2 react with 2 moles of CO2 to produce 3 moles of O2. Therefore, we need to convert the given masses of KO2 and CO2 into moles:

moles of KO2 = 2.61 g / molar mass of KO2 = 2.61 g / 71.10 g/mol = 0.0367 mol
moles of CO2 = 4.46 g / molar mass of CO2 = 4.46 g / 44.01 g/mol = 0.1013 mol

Next, we need to determine the limiting reagent (the reactant that will be completely consumed in the reaction) by comparing the mole ratios of KO2 and CO2 in the balanced equation. The ratio of moles of KO2 to moles of CO2 is:
0.0367 mol KO2 / 4 mol KO2 per 2 mol CO2 = 0.0184 mol CO2

Since this ratio is less than the actual number of moles of CO2 we have (0.1013 mol), CO2 is in excess and KO2 is the limiting reagent.

Using the mole ratio from the balanced equation, we can calculate the number of moles of O2 produced:

moles of O2 = 3 mol O2 per 4 mol KO2 × 0.0367 mol KO2 = 0.0275 mol O2

Finally, we can convert the moles of O2 to grams:

mass of O2 = moles of O2 × molar mass of O2 = 0.0275 mol × 32.00 g/mol = 0.88 g
Therefore, 2.61 g of KO2 and 4.46 g of CO2 would produce 0.88 g of O2.

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Answer:

0.5 g  or D

Explanation:

what is the mass of solute dissolved in 10.0 g of 5.00% Sugar solution?

A. 0.900 g

B. 0.180 g

C. 10.0 g

D. 0.500 g

E. 9.50 g

5% of the solution is sugar

o 10 g of the solution will have 9.5 g H2O and  0.5 g of sugar

0.5 /(9.5 +0.5) = 0.5/10 = 0.05 = 5 PER HUNDRED = 5%

so 0.5 g  or D

This means that the ratio of anhydrous compound to water in the hydrate is 1:2. Therefore, the value of "n" in the hydrate formula is 2.

To determine the value of "n" in the hydrate formula, we need to use the given information to calculate the number of moles of anhydrous compound and water in the sample, and then use the mole ratio between them to determine the value of "n".

First, we can calculate the number of moles of anhydrous compound:

moles of anhydrous compound = mass / molar mass

moles of anhydrous compound = 85.25 g / 208 g/mol

moles of anhydrous compound = 0.4091 mol

Next, we can calculate the number of moles of water:

moles of water = mass / molar mass

moles of water = 14.75 g / 18.015 g/mol

moles of water = 0.8180 mol

Anhydrous Compound - nH₂O

The mole ratio between the anhydrous compound and water is:

moles of anhydrous compound : moles of water

0.4091 mol : 0.8180 mol

We can simplify this ratio by dividing both sides by the smaller value:

0.4091 mol / 0.4091 mol : 0.8180 mol / 0.4091 mol

1 : 2

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Answer:

See below, please.

Explanation:

a. 1 mol H₂O has more representative particles than 1 mol OCl₂. This is because 1 mol of a substance contains Avogadro's number of particles (6.02 x 10²³), and H₂O has two atoms per molecule while OCl₂ has three atoms per molecule. Therefore, 1 mol of H₂O has twice as many particles as 1 mol of OCl₂.

b. 0.5 mol O₂ has more representative particles than 0.75 mol H₂. This is because O₂ is a diatomic molecule, meaning it contains two atoms per molecule, while H₂ only has one atom per molecule. Therefore, even though the quantity of H₂ is greater, O₂ has more particles overall.

c. 3.0 mol SnO₂ has more representative particles than 1.5 mol SnO. This is because SnO₂ has two atoms of oxygen per molecule, while SnO only has one atom of oxygen per molecule. Therefore, for the same number of moles, SnO₂ has twice as many oxygen atoms and thus more representative particles.

d. 0.66 mol FeO has more representative particles than 0.33 mol Fe₂O₃. This is because FeO has one atom of iron per molecule, while Fe₂O₃ has two atoms of iron per molecule. Therefore, for the same number of moles, FeO has twice as many iron atoms and thus more representative particles.

The percentage of ethylenediamine in the predominant form (H+3NCH2CH2NH+3) is 127.36%.

To determine the percentage of ethylenediamine in the predominant form at pH 6.184, we need to compare the pH with the pKa values of ethylenediamine (pb1 and pb2). The pKa values indicate the acidity or basicity of a molecule.

In this case, the predominant form of ethylenediamine at pH 6.184 is the protonated form (H+3NCH2CH2NH+3). To calculate the percentage, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

Since the predominant form is the protonated form, the concentration of the deprotonated form ([A-]) is negligible. Therefore, we can ignore it in the equation. The concentration of the protonated form ([HA]) is the percentage we are trying to calculate.

Let's calculate the percentage of ethylenediamine in the protonated form at pH 6.184 using the pKa value pb1 (4.072):

6.184 = 4.072 + log([A-]/[HA])

2.112 = log([A-]/[HA])

Now, we can convert this equation into the exponential form:

\(10^{2.112\) = [A-]/[HA]

Approximately,

127.36 = [A-]/[HA]

Since [A-] is negligible, we can assume it to be zero. Therefore, the concentration of [HA] is approximately 127.36.

To calculate the percentage, we need to divide the concentration of [HA] by the total concentration of ethylenediamine:

Percentage = ([HA] / Total concentration) * 100

Assuming the total concentration of ethylenediamine is 1 M,

Percentage = (127.36 / 1) * 100 = 127.36%

Therefore, at pH 6.184, the percentage of ethylenediamine in the predominant form (H+3NCH2CH2NH+3) is approximately 127.36%.

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Answer:

one to two inches (three to five centimeters) per year.

Explanation:

Answer:

1 to 2 inches (3 to 5 centimeters) per year

Explanation:

It depends on what plates your talking about, but in general, they move apart anywhere from 1 to 2 inches (3 to 5 centimeters) per year.

Specifically, though, The Arctic Ridge has the slowest rate (less than 2.5 cm/yr), and the East Pacific Rise near Easter Island, in the South Pacific about 3,400 km west of Chile, has the fastest rate (more than 15 cm/yr).

According to Newton's second law, force equals mass multiplied by acceleration. As a result, in a car accident, the force exerted by the vehicle and its occupants decreases as the time required for the vehicle to stop increases.

We clearly observed in the Exploration that when two cars collide, each feels a force from the other.

According to Newton's third law, when one object exerts a force on another, the second object feels an equal and opposite force exerted by the first object. This is very clear in the two-object collision.

The force with which your body is struck in a collision is referred to as crash force. Crash force is equal to your body weight multiplied by the vehicle's speed.

Newton's second law states that force equals mass multiplied by acceleration. As a result, the force exerted by the vehicle and its occupants in a car accident decreases as the time required for the vehicle to stop increases.

Thus, this way it hits the car.

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Answer:

Explanation:

he pH of the water will determine the toxic effects, if any, of these substances.

Pure water is neutral with the pH of 7. But when water combines with other substance the pH varies as per the acidity of the combining substance.

pH is the measure of acidity of a solution and mathematically it is the negative logarithm of hydrogen ion concentration. Acidic substance have a pH of less than 7 whereas, basic substance have higher pH value.

Water when combines with some acids, its acidity increases. For example acid rain resulting from the reaction of rain water with oxides of nitrogen and Sulphur forming nitric acid and sulphuric acid.

pH of water have a role in the toxic effects of components in water pH and alkalinity of water determines the coagulation of other substances in water.

Hence, the properties of other substance in water is pH dependent and might effect the alkalinity or acidity of water as well the properties of substances in water such as toxicity.

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Answer:

0.8878 mol KClO4

Explanation:

Molar mass of KClO4 = 39.0983 + 35.453 + ( 15.9994 x 4 ) = 39.0983 + 35.453 + 63.9976 = 138.5489g/mol

but,

number of moles = mass in grams / molar mass where mass in grams = 123g, molar mass = 138.5489g/mol

number of moles = 123g / 138.5489g/mol = 0.8878mol

Therefore the number of moles present in 123 g of \( KClO_4\) is 0.888 moles.

Given,

The weight of the \( KClO_4\) is 123. grams

molecular weight of \( KClO_4\) is \(39+35.5+16\times4=138.5 g\)

138.5 g of \(KclO_4\) is equal to one mole

Gram molecular wt. of a substance is equal to one mole

No. of moles = \(\frac{Wt}{GMW} \)

123 g of \(KClO_4\) is equal to \(\frac{123}{138.5}=0.888 moles \)

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