A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 417 pm. The diameter of the metal atom is:_______a. 417 pmb. 295 pmc. 209 pmd. 147 pme. none of these

Answer:

Explanation:

A?

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The Correct statement is ~

As we can observe, there's heat in product side of the given equation that shows - In the given reaction heat is released making it an exothermic reaction ~

I hope it helps ¡

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Ques.1: Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?

Ans:- It is because, I the onion peel is thick layered, then it will be hard or impossible to see through the microscope.

Ques.2: When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?

Ans: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.

This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.

Due to this, we can see the structure better.

Ques.3: From low power to high power, what structures became clearer in the stained onion tissue?

Ans: From lower to higher power, we can see:-

-- Large, rectangular interlocking cells,

-- Clearly visible distinct cell walls surrounding the cells,

-- Dark stained nucleus,

-- Large vacuoles at the center,

-- Small granules may be observed inside the cells (within the cytoplasm)

Ques.4: What is the shape of an onion cell?

Ans: The shape of an onion cell is rectangular or square in shape.

Enzyme saturation with the substrate occurs in Region C.

The enzyme is a compound that serves as a catalyst in living things and controls the rate at which chemical processes take place without changing itself in the process.

All biological activities in living things involve chemical reactions, and most of them are controlled by enzymes. Many of these reactions wouldn't occur at an observable rate without the help of enzymes. All facets of cellular metabolism are catalyzed by enzymes. This involves the breakdown of major nutritional molecules (such as proteins, carbs, and lipids) during digestion; the storage and transformation of chemical energy; and the synthesis of cellular macromolecules from smaller precursor molecules. A lack of a specific enzyme is the cause of many inherited human disorders, including albinism and phenylketonuria.

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The volume of the solution after solving is 0.67 liters.

To find the volume of the solution, we need to use the formula:

Molarity = moles of solute / volume of solution in liters

We are given that the molarity of the solution is  0.30 M. We also know the mass of the solute (KCl) is 15 g. To find the moles of KCl, we need to divide the mass by its molar mass:

Moles of KCl = 15 g / 74.55 g/mol = 0.201 moles

Now we can rearrange the formula to solve for the volume of the solution:

Volume = moles of solute / molarity

Volume = 0.201 moles / 0.30 M = 0.67 L

Therefore, the volume of the solution is 0.67 liters.

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The following changes would be expected in the pond over the same time period include increased levels of heavy metals and increased number of fish species. Thus, the correct options are II and III.

pH is an essential factor in pond ecosystems. Any change in pH has a substantial effect on aquatic life. The pH of a pond is affected by a variety of factors. Acid rain, industrial contamination, and sewage pollution are just a few examples. The following changes would be expected in the pond over the same time period:

Increased levels of heavy metals, which are caused by pollution. This increased levels of heavy metals would result in the loss of several fish species from the pond.

Therefore, the correct option will be D.

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To determine the mass of NaCl you would recover when evaporating 722 mL of a 7.8 M solution, you need to use the formula:

Mass = Volume x Concentration x Molar Mass


1. Start by converting the volume from milliliters to liters. Since there are 1000 mL in 1 L, divide 722 mL by 1000 to get 0.722 L.

2. Next, calculate the number of moles of NaCl in the solution. Multiply the volume (0.722 L) by the concentration (7.8 M) to get the number of moles.

  Moles = Volume x Concentration
        = 0.722 L x 7.8 mol/L

3. Determine the molar mass of NaCl. NaCl has a molar mass of approximately 58.44 g/mol.

4. Finally, calculate the mass of NaCl by multiplying the number of moles by the molar mass.

  Mass = Moles x Molar Mass
       = (0.722 L x 7.8 mol/L) x 58.44 g/mol

Therefore, the mass of NaCl that you would recover when evaporating 722 mL of a 7.8 M solution is approximately (0.722 L x 7.8 mol/L) x 58.44 g/mol.

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Answer:

60 ml

Explanation:

Now, we know that density = mass/volume

Mass of aluminium = 67.5 g

volume of aluminium =?

density of aluminium = 2.70 g/mL

volume of aluminium = mass/density = 67.5/2.70 = 25 ml

Since volume of water in the cylinder = 35 ml

The water rises to ; 35 ml + 25 ml = 60 ml

Answer: Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

Explanation:

Answer:

Explanation:

Answer:

An ionic bond is a chemical bonding involving the attraction between oppositely charged ions

Explanation:

On the periodic table, elements from group 1 and 7 are attracted to each other and when they bond, it's called ionic bonding. This is because of their valence electrons and ions.

Answer:

Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds. It is one of the main types of bonding along with covalent bonding.

Answer:

Chloroplasts?

Explanation:

The scientist would use the number of protons in each element to best determine if two observed atoms are of the same element. Option C is Correct.

The number of protons is also known as the atomic number, which uniquely identifies an element. If two atoms have the same number of protons, they are of the same element, regardless of the number of electrons or neutrons.

In other terms, we may state that all the atoms of a certain element have the same number of atoms. An element is a material whose atoms all have the same number of protons.

Features of an element include:

The fact that an element is a pure substance is its primary property. This indicates that it cannot be transformed into any other substance or broken down any more. Elements discusses how the elements interact with their surroundings, particularly temperatures and what happens when they are combined with other things. Since the statement that no two elements have the same sort of atom is accurate.

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The Complete question is

A scientist wants to know if two observed atoms are of the same element. Which of the following information about atomic particles would scientists use to best determine if they are the same element?

A. The number of electrons in each element

B. The number of neutrons in each element

C. The number of protons in each element

D. The number of atoms in each element

Answer: với những bài không biết bảo toàn e thì bạn có thể dùng bảo toàn nguyên tố cũng được, với pt hữu cơ thì ưu tiên cân bằng C, H trước rồi tới O

Explanation:

The correct answer is: D. All of the above.

In the chemical reaction 2Al(s) + 3Pt(NO3)2(aq) -> 3Pt(s) + 2Al(NO3)3(aq), we can determine the role of Al(s) by examining the changes in oxidation states.

The reducing agent: A reducing agent is a substance that undergoes oxidation, meaning it loses electrons, and causes the reduction of another species by donating electrons. In this reaction, Al(s) is oxidized from an oxidation state of 0 to +3 in Al(NO3)3(aq). Therefore, Al(s) is not the reducing agent.

The electron donor: An electron donor is a substance that donates electrons to another species. In this reaction, Al(s) donates electrons to Pt(NO3)2(aq), resulting in the reduction of Pt(II) ions to Pt(s). Therefore, Al(s) acts as the electron donor.

Being oxidized: When a substance undergoes oxidation, it loses electrons and increases its oxidation state. In this reaction, Al(s) is oxidized from an oxidation state of 0 to +3 in Al(NO3)3(aq). Therefore, Al(s) is being oxidized.

From the analysis above, we can conclude that the correct answer is:

D. All of the above

Al(s) is the electron donor, it undergoes oxidation and loses electrons, and therefore acts as the reducing agent in this chemical reaction. It is important to note that in redox reactions, the species that is oxidized is the reducing agent, and the species that is reduced is the oxidizing agent.

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Answer:

yes, enthalpy of neutralization is always constant for a strong acid and a strong base: this is because all strong acids and strong bases are completely ionized in dilute solution. Enthalpy changes in neutralization are always negative-when an acid and alkali react, heat is given out.

Explanation:

Answer:

they all have the same amount of kinetic energy

The kinetic molecular theory of matter explains the physical properties of matter and how they relate to their molecular structures. This theory states that matter is made up of tiny particles, called molecules, that are always in constant motion, even when in a solid state.

The kinetic molecular theory of matter helps in explaining the properties of matter and how it relates to the molecular structures of matter. According to this theory, the particles that make up matter are in constant motion regardless of their state of matter, and their motion is related to the state of matter they exist in. The theory is divided into three main postulates as follows:1. Matter is made up of tiny particles called molecules that are in constant motion, even when in a solid state.2. The movement of these particles increases with an increase in temperature, resulting in an increase in the kinetic energy of the particles.3.

The collisions between these particles and the walls of the container they are in result in the pressure exerted by the gas. The relationship between heat, energy, and temperature as part of the kinetic molecular theory is as follows:Heat is the transfer of energy between different systems, whereas temperature is the measure of the average kinetic energy of the particles in a system. This means that as heat is transferred into a system, the particles in that system will gain kinetic energy, which will lead to an increase in temperature.

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Answer:

Explanation:

Divide each weight by their respective element weights.

Na\(_2\)S\(_2\)O\(_3\) is the empirical formula for the compound that has 46 grams of sodium, 64 grams of sulfur, and 48 grams of oxygen.

In chemistry, the equation of maybe a chemical compound is the simplest complete number percentage of atoms that make up a molecule. The empirical formulas for sulfur monoxide, SO, and disulfur dioxide, S2O2, are two simple instances of this concept.

They do not, nonetheless, share comparable molecular formulas, which indicate how many elements are contained in each chemical compound's molecules. An empirical formula does not specify the arrangement or number of atoms. Several polymers, including such silicon dioxide, nor ionic compounds, including such calcium chloride (CaCl2), have this property (SiO2).

moles of sodium = 46/23=2

moles of sulfur = 64 / 32=2

moles of oxygen =48 / 16 =3

Na\(_2\)S\(_2\)O\(_3\)  is the empirical formula

Therefore, Na\(_2\)S\(_2\)O\(_3\) is the empirical formula.

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The average kinetic energy of a gas's molecules is influenced by its temperature and molar mass. However, all gases have the same average kinetic energy when the temperature is the same.

Which energy do you mean by kinetic?

Describe kinetic energy. A particle or an item that is in motion has a sort of energy called kinetic energy. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.

What is the energy equation?

Albert Einstein created the equation E = mc2, which typically states that when a body's energy changes by an amount E (no matter what form the energy takes),

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During an asthma attack temperature can be decreased to increase the volume of the airway.

This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume.

\(\rm \dfrac{V'}{T'} = \dfrac{V}{T}\)

which means volume is inversely proportional to temperature so the temperature can be decreased in the atmosphere to increase volume of the airway.

This means that, when you inhale cold air, it will change volume as it warms in passing through the sinuses.

As the air warms it expands to a larger volume.

Therefore during an asthma attack temperature can be decreased to increase the volume of the airway.

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The General Hazardous Materials Behavior Model event that involves the material being free to travel or disperse, allowing it to move outward from the source is known as dispersion.

This is the third event in the model and occurs after the release and contact events. During dispersion, the material is no longer contained and can spread through the air, water, or ground.

This can potentially cause harm to people, animals, and the environment. It is important to understand and predict the dispersion of hazardous materials in order to prevent or minimize the impact of an incident.

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Answer:

See explanation

Explanation:

Even though the image is missing here but i believe that the other pancakes are at different temperatures. If this is the case, the pancake at the highest temperature will make the bottom pancake the warmest due to transfer of thermal energy.

The transfer of thermal energy between the hotter pancake and the bottom pancake occurs by conduction. Conduction is a mode of transfer of thermal energy that occurs when the two bodies are in close contact with each other.

After they have been touching for a while, the temperature of the bottom pancake increases while the temperature of the top pancake decreases since thermal energy is being transferred from the top pancake to the bottom pancake.

The information regarding the energy and the temperature should be explained below:

The following information should be considered:

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might be gas change or colour change

Answer:

A. pairs of dots

Explanation:

To determine the molarity of a CH3COOH solution, we can use the concept of stoichiometry and the volume and molarity information given for the neutralization reaction.

The balanced chemical equation for the reaction between CH3COOH (acetic acid) and NaHCO3 (sodium bicarbonate) is:

CH3COOH + NaHCO3 → CH3COONa + H2O + CO2

From the equation, we can see that the ratio between CH3COOH and NaHCO3 is 1:1. This means that one mole of CH3COOH reacts with one mole of NaHCO3.

First, let's calculate the number of moles of NaHCO3 used in the reaction:

moles of NaHCO3 = volume (in L) × molarity

= 7.12 ml × 0.00114 mol/ml

= 0.0081168 mol

Since the ratio of CH3COOH to NaHCO3 is 1:1, the number of moles of CH3COOH used in the reaction is also 0.0081168 mol.

Next, we can calculate the molarity of the CH3COOH solution:

molarity = moles/volume (in L)

= 0.0081168 mol / 0.00986 L

= 0.824 M

Therefore, the molarity of the CH3COOH solution is 0.824 M.

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Answer:

\(2H_2 + O_2 -> 2 H_2 O\)

Answer:

800 N

Explanation:

It is 800 N because it's going in the same direction just like the 1200 N.

Answer:

B

Explanation:

If the crate is stationary that means that the sum of forces is 0

both 1200 N alredy cancel themselves because they are opposite

so we need to cancel the 800N

800 -x =0

x=800 N

Answer:

The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people. The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum).

Explanation:

The pH of H2SO4 is 1.20×10–2.

We need to determine the pH of a 0.310 M solution of H2SO4.In order to find pH, we'll need to find the [H+] of the solution.

At equilibrium, the concentration of H+ will be twice that of the initial concentration of H2SO4.

Thus, [H+] = 2 × 0.310 = 0.620 M

The concentration of [SO42-] will also be 0.310 M.

Using the Ka2 expression for H2SO4 gives:

Ka2 = ([H+][SO42-])/[H2SO4]1.20 × 10-2 = (0.620 x 0.310)/[H2SO4][H2SO4] = 0.12 M

The [H+] in the solution is 2 × 0.310 = 0.620 M,

so:

pH = -log([H+]) = -log(0.620) = 0.2064 (rounded to four significant figures)pH = 0.21 (rounded to two significant figures)

Therefore, the pH of a 0.310 M solution of H2SO4 is 0.21.

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