Which of the following is a property of atoms?

A. They are very small.

B. They do not take up space.

C .They have no mass.

D. They have a large volume.

Answer:

The change in smell

Explanation:

chemical reactions ccan lead to change in temperature, change in color and also change in smell

The moles of water that are produced from 373 moles of ammonia present in any chemical reaction is 746 moles.

Stoichiometry of the reaction gives idea about the amount of entities present in any chemical reaction before and after the reaction.

Given chemical reaction is:

3Al + 3NH₄ClO₄ → Al₂O₃ + AlCl₃ + 3NO + 6H₂O

From the stoichiometry of the reaction it is clear that:

3 moles of Al = produces 6 moles of H₂O

373 moles of Al = produces 6/3×373 = 746 moles of H₂O

Hence required moles of water is 746 moles.

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T-butyl bromide alkyl halide would result in the formation of the most stable carbocation. The quantity of methyl groups bonded to the core carbon is often associated with carbocation stability.

Halogens are a class of chemical compounds known as halides. There are halides in the natural world, and some of them, like salts and acids, are essential to sustaining life. Halides can be found in minerals, organisms, and plants. NaCl, or table salt, is the most widely used halide.

The class of minerals known as halides includes the sodium, salt, and salts of hydrochloric acid. The crystals halite, sylvite, and carnallite are part of this group of minerals, and they exclusively include chloride that has petrogenic significance. Halite, another name for rock salt (NaCl).

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The specific heat capacity of water is 4.18 J/(g K) and the given amount of water is more than 100 grams. We need to calculate the energy absorbed by the water to reach boiling point when 5.39 × 10^5 J of heat is supplied.

The amount of water used is not provided in the question, therefore, let's first calculate the energy required to raise the temperature of 100g of water from room temperature (25°C) to its boiling point (100°C) using the formula,Q = m × c × ΔTwhere,Q = energy absorbedm = mass of waterc = specific heat capacity of waterΔT = change in temperature of water= 100 - 25 = 75°C (since the water is heated until it just begins to boil)Thus,Q = \(100 g × 4.18 J/(g K) × 75°C= 31350 J= 31.35 kJ\) of energy is required to heat 100g of water from 25°C to 100°C.

Now, let's determine the mass of water using the amount of heat energy supplied:Q =\(m × c × ΔT, where Q = 5.39 × 10^5 Jm = Q / (c × ΔT)= 5.39 × 10^5 J / (4.18 J/(g K) × 75°C)= 204.55 g\)(approx.)Therefore, more than 100 g of water is required to absorb 5.39 × 10^5 J of heat to reach its boiling point.

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Answer:

Proportion : The Equality of two ratios

Equation:  Values of two mathematical expressions are equal.

Formula: Mathematical relationship or rule expressed in symbols.

Explanation:

Answer:

protostar: (c) Begins to have carbon build-up in the core

main sequence star: (b) Burns hydrogen as its primary fuel

white dwarf: (e) Is no longer undergoing fusion

red giant: (d) Is near its final stage of evolution

Explanation:

Answer:

No,it is not possible to jump directly because the upper body parts are In motion but legparts directly comes in rest due to unbalanced inertia he may get hurt so..

Starting with a 0. 1525 m HCL stock solution, For first  concentration solution n2 = 0.007625 M, for second solution n2 = 0.0003813 M, for third solution n2 = 0.00001906 M.

For first solution

Initial concentration = n1 = 0.1525 M

Volume taken = v1 = 5 ml

Final concentration = n2 = ?

Final volume = v2 = 100 ml

We know,

n1 v1 = n2 v2

n2 = n1v1/ v2 = ( 0.1525 M × 5ml) / 100 ml

n2 = 0.007625 M

Concentration of first solution = 0.007625 M

For 2nd solution

Initial concentration = n1 = 0.007625 M

Volume taken = v2 = 5 ml

Final concentration = n2 = ?

Final volume = v2 = 100 ml

We know,

n1 v1 = n2 v2

n2 = n1v1/ v2 = ( 0. 007625 M × 5ml) / 100 ml

n2 = 0.0003813 M

Concentration of second solution = 0.0003813 M

Fir third solution

Initial concentration = n1 = 0.0003813 M

Volume taken = v1 = 5 ml

Final concentration = n2 = ?

Final volume = v2 = 100 ml

We know,

n1 v1 = n2 v2

n2 = n1v1/ v2 = ( 0.0003813 M × 5ml) / 100 ml

n2 = 0.00001906 M

Concentration of first solution = 0.00001906 M

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

pH = 6.20

Explanation:

The pKa of cacodylic acid is 6.

To solve this question we must use Henderson-Hasselbalch equation:

pH = pKa +log [A⁻] / [HA]

Where pKa is the pKa of the weak acid = 6

And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.

The moles of the NaOH added to the solution of the weak acid are = Moles A⁻

And moles HA = Initial moles HA - Moles NaOH added

Initial moles HA:

0.0200L * (0.130mol / L) = 0.00260 moles

Moles NaOH:

0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]

Moles HA =

0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]

pH = 6 +log [0.00160 moles] / [0.00100 moles]

The pH of the resulting solution is 1.6.

Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;

HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)

Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles

Number of moles of HA = 20.0/1000  × 0.130 = 0.0026 moles

We can see that the HA is in excess, Number of moles of excess acid =

0.0026 - 0.0016 = 0.001 moles

Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L

Molarity of excess acid =  0.001 moles/0.004 L = 0.025 M

pH = -log[H^+]

pH = -log[0.025 M]

pH = 1.6

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Answer:

1. Chief executive officer = Nucleus.

2. Power house = Mitochondrion.

3. Maintenance team = Lysosomes.

4. Functional managers = Chromosomes.

5. Assembly line workers = Ribosomes.

6. Assembly line = Endoplasmic Reticulum.

7. Security and support = Cytoskeleton.

8. Drivers or messengers = Vesicles.

9. Packaging unit = Golgi apparatus.

10. Gate man/procurement unit = Cell membrane.

Explanation:

A cell can be defined as the structural, fundamental, biological and functional unit of life. Cells are found in all living organisms because they are the basic unit of life.

Generally, cells have the ability to independently replicate themselves. These cells can be compared to the kind of structures found in a business or factory, where you have different workers performing different functions.

In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles.

Factory worker = Cell organelle.

1. Chief executive officer = Nucleus.

2. Power house = Mitochondrion.

3. Maintenance team = Lysosomes.

4. Functional managers = Chromosomes.

5. Assembly line workers = Ribosomes.

6. Assembly line = Endoplasmic Reticulum.

7. Security and support = Cytoskeleton.

8. Drivers or messengers = Vesicles.

9. Packaging unit = Golgi apparatus.

10. Gate man/procurement unit = Cell membrane.

Answer:

C

Explanation:

because it is the only one that will give you an accurate answer.

The Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.

As given in the problem we have to find out how much PE would a 100 kg man have on a sled at the top of the hill.

The potential energy of the man = 100 × 9.8 × H

                                                      = 980H

Both mass and acceleration due to the gravity of the earth are constant and the only variable is the height of the inclined surface.

Thus, a ball rolling down an incline has its maximum potential energy at the top, therefore the correct answer is option D.

Thus, the Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.

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We know that 1 mole of sodium contains Avogadro number of atoms. - But we have to find the number of atoms in 0.2 mole of sodium. - Therefore 0.2 moles of sodium (Na) contains 12.046×1023atoms in it.

Answer:

0.073 g

here is to keep in mind that you need 2 moles of hydrochloric acid in order to neutralize 1 mole of magnesium hydroxide.

Explanation:

When studying the effect of temperature on the volume of a gas by heating a gas in a cylinder and measuring the resulting changes in volume, the following assumptions need to be made: Pressure remains constant.

To analyze the effect of temperature on the volume of gas, the pressure of the gas should remain constant. Volume of the cylinder. To calculate the effect of temperature on the gas, the volume of the cylinder must remain constant. In no way does the gas leak out. The gas cylinder's seals should be tight enough so that the gas doesn't leak out.

                     Furthermore, there should be no leaks in the gas cylinder's walls. The experiment will not produce the desired results if there is a gas leak.The gas behaves ideally. The gas is assumed to be an ideal gas with no intermolecular forces or collisions. The ideal gas law should be used to determine the behavior of the gas.The thermometer used is accurate and precise. The temperature of the gas must be measured precisely and accurately. A high-quality thermometer should be used to achieve this.

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Answer:

Oxidation  half  reaction  is  written   as    follows when  using  using  reduction potential  chart

example  when  using  copper  it is  written  as  follows

CU2+   +2e-  --> c(s)  +0.34v

oxidasation  is the  loos  of  electron  hence copper oxidation  potential  is  as  follows

cu (s)  -->  CU2+   +2e    -0.34v

Explanation:

Answer:

The potential difference is caused by the ability of electrons to flow from one half cell to the other. Electrons are able to move between electrodes because the chemical reaction is a redox reaction. ... The cell potential (Ecell) is measured in voltage (V), which allows us to give a certain value to the cell potential.

Explanation:

F-1 would have a larger radius because it has one less electron than F, reducing the electrostatic attraction between the nucleus and electrons, making the atom larger.

The radius of an atom is determined by the distance between the nucleus and the outermost electron shell. The number of electrons in the outermost shell, or valence electrons, determines the size of the atom. In this case, F has 9 electrons in its outermost shell, while F-1 has 8 electrons. With one fewer electron, F-1 has less electrostatic attraction between the nucleus and electrons, and thus a larger radius.Valence electrons are the electrons in the outermost shell of an atom that participate in chemical reactions. The number of valence electrons an atom has determines its reactivity and how it will bond with other atoms

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All of the following compounds are molecular: PbF2, FeS, P4O6, and CBr4.

Molecules are composed of two or more atoms that are held together by chemical bonds. The atoms in a molecule are arranged in a specific pattern and the bonding between them determines the structure of the molecule.

Compounds, on the other hand, consist of two or more atoms that are not held together by chemical bonds.

The atoms in a compound may not be arranged in any specific pattern, and the bonding between them is generally weaker than that in a molecule.

PbF2, FeS, P4O6, and CBr4 are all compounds because they are not held together by chemical bonds. PbF2 is composed of one lead atom and two fluorine atoms.

FeS is composed of one iron atom and one sulfur atom. P4O6 is composed of four phosphorus atoms and six oxygen atoms.

Finally, CBr4 is composed of one carbon atom and four bromine atoms. All of these compounds are molecular because they are composed of two or more atoms held together by chemical bonds.



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Answer:

162.4

Explanation:

Because yea thats the answer no need to tell you why ok bye

The pH of a solution that is made by combining 15.0 mL of 18.0 M acetic acid with 5.60 g of sodium acetate and diluting to a total volume of 1.50 L is 3.45

To calculate the pH of the solution, we need to first determine the concentrations of acetic acid (CH₃COOH) and sodium acetate (CH₃COONa) in the solution.

1. Calculate the moles of acetic acid:
moles of CH₃COOH = volume (L) x concentration (M)
moles of CH₃COOH = 0.015 L x 18.0 M = 0.27 mol

2. Calculate the moles of sodium acetate:
moles of CH₃COONa = mass (g) / molar mass (g/mol)
moles of CH₃COONa = 5.60 g / (82.03 g/mol) = 0.0683 mol

3. Calculate the concentrations in the final solution:
[CH₃COOH] = moles of CH₃COOH / total volume (L) = 0.27 mol / 1.50 L = 0.18 M
[CH₃COONa] = moles of CH₃COONa / total volume (L) = 0.0683 mol / 1.50 L = 0.0455 M

4. Now, we can use the Henderson-Hasselbalch equation to find the pH:
pH = pKa + log ([A-] / [HA])
The pKa of acetic acid is 4.74. Substituting the values into the equation:
pH = 4.74 + log (0.0455 / 0.18)

5. Solve for pH:
pH ≈ 4.74 - 1.29 = 3.45

The pH of the solution is approximately 3.45.

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At equilibrium, the formation of products from reactants or reactants from products occur at the same rate.

Reaction goes in both direction, both reactants and product are present.

The amount of substance of reactants and products of reaction do not change when chemical reaction is in chemical equilibrium.

In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which not change with time.

Speed of direct and irreversible chemical reaction are equal.

For example, balanced chemical reaction in equilibrium:

3H₂ + N₂ ⇄ 2NH₃

Hydrogen (H₂ ) and nitrogen (N₂) are reactants.

Ammonia (NH₃) is product of the reaction.

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Answer:

sodium

Explanation:

The ionic compound's metal will be replaced with AI. True for Fe2O3

Atomic bonds can be covalent or ionic in nature. The structures and characteristics of these bonds vary. Pairs of electrons are included in covalent bonds through the binding of two atoms in a specific orientation. Ionic bonds, on the other hand, are bonds that connect two ions.

Ionic bonding will typically be present in compounds where a metal is bound to either a quasi or a semi-metal. Molecular compounds are those that contain only non-metals or quasi combined with non-metals and exhibit covalent bonding.

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Answer:

A) Ca(s) + C(s) + 3/2 O₂(g) → CaCO₃(s)

Explanation:

Standard enthalpy of formation of a chemical is defined as the change in enthalpy durin the formation of 1 mole of the substance from its constituent elements in their standard states.

The consituent elements of calcium carbonate, CaCO₃, in their standard states (States you will find this pure elements in nature), are:

Ca(s), C(s) and O₂(g)

That means, the equation that represents standard enthalpy of CaCO₃ is:

Is the equation that has ΔH° = -1207kJ/mol

Answer:

The answer is sodium which is the element is the most reactive.

Answer:

The chemistry will need 2*10⁶ moles of antimony trifluoride.

Explanation:

The balanced reaction is:

3 CCl₄ (g) + 2 SbF₃ (s) → 3 CCl₂F₂(g) + 2 SbCl₃ (s)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

You can apply the following rule of three: if by reaction stoichiometry 3 moles of freon are produced by 2 moles of antimony trifluoride, 3*10⁶ moles of Freon are produced from how many moles of antimony trifluoride?

\(moles of antimony trifluoride=\frac{3*10^{6} moles of freon*2 moles of antimony trifluoride}{3 moles of freon}\)

moles of antimony trifluoride= 2*10⁶

The chemistry will need 2*10⁶ moles of antimony trifluoride.