For the reaction HCl + NaOH ® NaCl + H2O, how many moles of hydrochloric acid are required to produce 180. g of water?

At high temperatures, a diatomic molecule possesses a total of six degrees of freedom.

Because a gas molecule may travel in any direction, it has three translational degrees of freedom. This is true for all gas molecules, whether monatomic, diatomic, or polyatomic, since every molecule in three-dimensional space may travel freely in all directions.

As a result, a diatomic molecule possesses five degrees of freedom: three translational and two translational.

As a result, a diatomic gas molecule possesses 6 degrees of freedom. This set may be divided into molecular translations, rotations, and vibrations. Three degrees of freedom are accounted for by the whole molecule's center of mass motion.

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Answer:

C.4

Explanation:

The arrow 4 represents the transition in which dew is formed.

This is formed as a result of condensation which takes place in the morning or evening and is usually seen on exposed surfaces as water droplets.

The air particles in the form of vapor under low temperatures results in the formation of the substance. The arrow 4 thereby depicts it and makes it the most appropriate choice.,

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7.66 x 10⁵ mmol of argon is equal to 7.66 x 10⁵ x 6.022 x 1023 argon atoms. That is the same as 4.62 x 1029 atoms of argon.

To put this in perspective, this is equivalent to the number of grains of sand that would fill more than 10,000 Olympic-sized swimming pools. Since argon is an inert gas, it can be found in the atmosphere, and is often used in a variety of industrial processes.

For example, argon is used to preserve food and to create a protective atmosphere for arc welding and other metalworking processes. It is also used in the production of light bulbs and for the purification of silicon wafers used in the manufacture of computer chips. The sheer amount of argon atoms contained in 7.66 x 10⁵ mmol of argon makes it an incredibly versatile and valuable element.

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Answer:

both are done due to the enviroment??

Answer:

So NH4Cl has ionic bond between NH4+ and Cl-, hydrogen bond (can be considered covalent bond too and N and H are both non metals and covalent bonds occur between non metals) between N and H in NH4 and covalent bond between NH4 and another NH4

The retention times of the compounds change if the solvent composition was changed from 55 vol% acetone and 45 vol% water to 85 vol% acetone and 15 vol% water is decreases..

The acetone and the water mixture is polar . this makes the example of reversed phase reaction. Acetone is the polar molecule and the water is also o polar molecule and there mixture is polar mixture.

For the polar solutes which are separated by the hydrophilic interaction chromatography. the the solvent composition changed from the 55 vol% of the acetone and the 45 vol% of the water to the 85 vol% of the acetone and the 15 vol% of the water , the retention times decreases.

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Answer:

OB

Explanation:

interview with many smokers ,in this way she would directly be able to tell the effects

It is the name given to the combination of strong and weak nuclear forces.

We know that the nucleus of the atom is the place that houses the greatest amount of energy. We could obtain the highest energy by ripping open the nucleus of an atom. There is a huge energy that holds the particles in the nucleus together and this called the nuclear binding energy.

This energy must also be required to break the nucleus as is the case in the operation of the atomic bond and in nuclear reactors. The true statement about the nuclear energy is that; It is the name given to the combination of strong and weak nuclear forces.

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Answer:

The mass of sodium hydroxide will result in the same mass of sodium chloride.

The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water

The mass of hydrochloric acid will result in the same mass of sodium chloride.

The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water

Explanation:

Answer:

The mass of sodium hydroxide will result in the same mass of sodium chloride.

The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water

The mass of hydrochloric acid will result in the same mass of sodium chloride.

The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water

Explanation:

Answer:

Homo means same

Hetero means different.

Homogeneous mixtures have one phase, it all looks the same, Fruit juice is homogeneous, solutions are homogeneous.

Heterogeneous mixtures have different phases, you can see the different parts, pepper is an example of a heterogeneous mixture.

In a homogeneous mixture the constituents are able to dissolve in each other due to their similar intermolecular forces, whereas in a heterogeneous mixture the constituents are not miscible- meaning they can't dissolve in each other.

To clarify: intermolecular forces describe the way that types of molecules will interact with each other. For instance, water (a polar molecule) and naphthalene (a non-polar molecule) are said to be "immiscible" because their intermolecular forces do not match. The saying goes: "like dissolves like". Meaning that molecules that have similar IFs will be mutually soluble (miscible, in other words).

a. The measurements on the target do not represent accuracy well.

b. The measurements on the target represent precision fairly well.

Accuracy refers to the closeness of a measurement to the true or accepted value. Since they are off target, the measurements are not accurate.

Precision refers to the consistency and reproducibility of measurements, and in this case, the shots are clustered around certain areas, with two points in the second circle and two points in the third circle. This indicates that the person taking the shots was able to consistently hit a certain area.

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Explanation:

bro this question looks like Astrophysics

By using the universal gravitational law, the gravitational force between the lander and the planet is 688.4 × 10³ N. The acceleration due to gravity of the lander is 6.25 m/s² . The slight changes in gravity may be due to the change with different latitudes of the planet.

Gravitational force is the force by which an object attracts other objects into its center of mass. According to universal gravitational law, the gravitational force can be calculated for two masses m1 and m2 at a distance of r with gravitational constant G as follows:

g = G m1m2/r²

Apply the given values of mass and orbital radius to the equation as follows:

g = (6.647 × 10⁻¹¹ N m² Kg⁻²) (1.1 × 10⁵ Kg × 7.6×10²⁴ Kg ) / (9 × 10⁶ m)²

  =  688.4 × 10³ N.

The acceleration due to gravity of the lander = force /mass

                                                                           =   688.4 × 10³ N /1.1 × 10⁵Kg

                                                                           = 6.25 m/s²

The actual force of gravity may change from the may slightly change from the calculated value because different latitudes will experience different gravity.

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a) Zinc blend crystal system: This type of structure has a face-centered cubic (FCC) lattice. Zinc blend structure contains two different atomic species, each of which occupies half of the octahedral holes.

The atoms in zinc blend structure are arranged in an ABAB sequence. The zinc blend crystal system belongs to the cubic crystal system.Wurtzite crystal system: This type of structure is a hexagonal close-packed (HCP) lattice. In a wurtzite structure, each species of atoms occupies a distinct lattice position. Wurtzite structure consists of two interpenetrating sub-lattices. The wurtzite crystal system belongs to the hexagonal crystal system.b) Fractio: The unit cell of ZnS structure has two ZnS molecules. The ZnS structure is a combination of the zinc blend and the wurtzite structures. In the ZnS structure, each Zn atom is tetrahedrally coordinated with four S atoms, while each S atom is coordinately bonded to four Zn atoms.

ZnS structure is an example of a compound that can exist in different structures. It can have a zinc blend structure in which Zn and S occupy alternate positions in a face-centered cubic (FCC) array. The second possible structure of ZnS is the wurtzite structure in which S and Zn atoms are arranged in a hexagonal close-packed lattice. Therefore, the fraction for the ZnS compound is {1/2, 1/2, 0}.

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Given :

A chemical equation :

H₂O₂ → H₂O + O₂

Solution :

We can see that there are 2 oxygen atoms in LHS and 3 on RHS .

So, we can reduce the oxygen atoms to two in THS by just dividing it by 2.

H₂O₂ → H₂O + \(\dfrac{1}{2}\)O₂

Now, multiplying both sides by 2, we get :

2H₂O₂ → 2H₂O + O₂

Therefore, the balanced chemical equation is 2H₂O₂ → 2H₂O + O₂ .

A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).

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To combine ions to form ionic compounds, we need the combine in such a way that it gets neutral charge.

We can combine each anion with each cation to get the 4 compounds we need.

To combine SO₄²⁻ with Pb⁴⁺ we first find the Least Common Multiple of their charges, 2 and 4.

They have the factor 2 in common, so the LCM is 4. This is the final charge of each that will cancel out.

To get 4+, we only need 1 Pb⁴⁺.

To get 4-, we need 2 SO₄²⁻.

So, the formula is:

Pb(SO₄)₂

To combine SO₄²⁻ with NH₄⁺ is easier because one of them has single charge. In this case, we can simply pick one of the multiple charge ion and the same amount that will cancel its charge of the single charged one.

So, we picke 1 SO₄²⁻, ending with 2-.

And we picke 2 NH₄⁺, ending with 2+.

The formula:

(NH₄)₂SO₄

To combine C₂H₃O₂⁻ with Pb⁴⁺ we do the same, because the anion is single charged.

Pick 1 Pb⁴⁺, ending with 4+.

Pick 4 C₂H₃O₂⁻, ending with 4-.

The formula:

Pb(C₂H₃O₂)₄

To combine C₂H₃O₂⁻ with NH₄⁺, both have same charge, so we just need one of each and their charges will cancel out.

The formula:

NH₄C₂H₃O₂

So, the formulas are:

Pb(SO₄)₂

(NH₄)₂SO₄

Pb(C₂H₃O₂)₄

NH₄C₂H₃O₂

Answer:

d. Oxygen

Explanation:

- Water is not an element but a compound made of hydrogen and oxygen elements

- Air is a compound made of gases such as oxygen, nitrogen, rare gases and carbondioxide...

- Sugar is an organic compound (sucrose) made of carbonyl carbons and hydrocarbons

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The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

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Answer:

a) Number of moles = 0.41 mol

b) Number of moles = 0.44 mol

c) Number of moles = 0.47 mol

Explanation:

a)

Given data:

Mass of copper sulfate = 65.5 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass of copper sulfate = 159.6 g/mol

Number of moles = 65.5 g/ 159.6 g/mol

Number of moles = 0.41 mol

b)

Given data:

Mass of magnesium nitrate  = 65.5 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass of magnesium nitrate = 148.3 g/mol

Number of moles = 65.5 g/148.3g/mol

Number of moles = 0.44 mol

c)

Given data:

Mass of potassium carbonate  = 65.5 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass of potassium carbonate = 138.2 g/mol

Number of moles = 65.5 g/138.2g/mol

Number of moles = 0.47 mol

Answer: 2 AgNO3(aq) + NiCl2(aq) ⇒ 2 AgCl(s) + Ni(NO3)2 (aq)

Explanation:

Iodine is the most likely candidate since, first of all, it is included in the list of halogens together with all of the other elements.

Iodine is used orally to prevent and cure iodine deficiency and also its effects, such as goiter but some thyroid problems. The US FDA has also approved potassium iodide, a particular kind of iodine, to protect thyroid damage following a radioactive mishap.

Inflammation of the thyroid gland and thyroid cancer can also result from high iodine consumption. A very high amount of iodine (several grams, for instance) can result in a coma, fever, stomach pain, nausea, vomiting, diarrhea, and burning in the mouth, throat, and stomach.

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Answer:

repel, if you stick them together as they are, because the north and south poles are next to each other

Explanation:

The continental plates on Earth's crust are moving (tectonic movement) because of a.) The mantle material, denser than the crust, is continually moving

The movement of the continental plates on Earth's crust is a result of tectonic movement. This movement is caused by convection currents in the mantle layer of the Earth.

The mantle is a layer of hot, dense material beneath the Earth's crust that is in constant motion. The mantle material is denser than the crust and is constantly rising and sinking in a process known as convection. The rising mantle material pushes the plates of the Earth's crust apart, while the sinking mantle material pulls the plates of the Earth's crust together.

This movement causes the plates to grind against each other, resulting in earthquakes and volcanic activity. The movements of these plates also cause mountains to rise and valleys to form. The forces of tectonic movement are so powerful that they can even cause entire continents to split apart.

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Answer:

Physical changes

Explanation:

Changes in the state of matter are physical changes.

First, the material is made up of the same components that is was before it changed states.

The physical properties of the material changed, but its chemical composition did not, meaning that is is a physical change.

Answer:

Physical change

Explanation:

Matter can change between phases, so they are reversible physical changes that do not change matter’s chemical composition.

Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. Water, for example, can be a solid (ice), a liquid (drinking water), or a gas (steam). Those are physical changes that don't change the fact that water is always chemically made up of H2O (two hydrogens and one oxygen).

Answer:

Gene - determines the trait (phenotype)

Answer:

PVC is a versatile material that offers many possible applications, these include; window frames, drainage pipe, water service pipe, medical devices, blood storage bags, cable and wire insulation, resilient flooring, roofing membranes, stationary, automotive interiors and seat coverings, fashion and footwear, packaging .

Explanation:

Answer:

Yes

Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. ... Notable gemstones high in beryllium include beryl (aquamarine, emerald) and chrysoberyl.

Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.

Answer:

Carbon atoms each form four strong bonds. The bonds are covalent (atoms share electrons). This gives graphite its characteristic properties such as high melting and boiling points, good electrical conductivity, and softness. Use as pencil 'lead', as a lubricant in oil, furnace linings, electrodes, neutron moderators in nuclear power stations.

Diamond atoms each form three strong covalent bonds in the same layer and one weak bond to an atom in another layer.  Diamonds have a high level of hardness, thermal conductivity, and optical dispersion. It is used for jewellery, oil-well drills, abrasives and cutting tools.

Explanation:

Structure of Graphite and Diamond (attached below):

Answer:

Biological Evidence

Explanation:

Both blood and sweat are fluids within the body, therefore, both are biological substances.