The Al2O3 crystal structure (corundum) consists of an HCP arrangement of O2- ions; the Al3 ions occupy octahedral positions. What fraction of the available octahedral positions are filled with Al3 ions

Answer:

7° it's that cause the crylatise

The temperature at which 4.62 g of KCl begins to crystallize in 10 mL of water is 62° Celsius.

Temperature is the measurement of the hotness or coldness of the body. It is denoted by Kelvin.

Given, m=4.62 g of KCl, V= 10 ml of water

ro = 1 g/ml for water, so m(water)

V x ro = 10ml x 1(g/ml) = 10 g.

Solubility (for water as solvent) is defined as grams of solute dissolved per 100g of water.

So solubility for this case = m(KCl)/m(water) =

4.62g of KCl/10g of water = 46.2 g of KCl/100 g of water.

According to the graph below, KCl's solubility reached 46.2 g/100 g at a temperature of about 62 degrees Celsius.

KCl/10 g of water or 46.2 g of KCl/100 g of water.

Therefore, cooling the solution is necessary for crystallization. Crystallization will occur in this situation as soon as the temperature falls below 62 degrees Celsius (about).

The ultimate conclusion is that this KCl solution in water will begin to crystallize at 62 degrees Celsius (about).

Therefore, the temperature is 62° Celsius.

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What is meant that mass cannot be created nor destroyed in the law of conservation of mass is that, matter can take part in a chemical reaction, but the initial mass of the matter (reactants) will be equal to the final mass of the matter (products formed).

The law of conservation of mass states that the mass can neither be created nor destroyed but it can be transformed from one form to another.

Examples of law of conservation of mass;

So, in the law of conservation of mass, the sum of the masses of the reactants in a chemical reaction and products formed in the process remains unchanged.

Thus, what is meant that mass cannot be created nor destroyed in the law of conservation of mass is that, matter can take part in a chemical reaction, but the initial mass of the matter (reactants) will be equal to the final mass of the matter (products formed).

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Answer:

The law of conservation of mass states that the mass can neither be created nor destroyed but it can be transformed from one form to another.

Explanation:

Do 19565 ft × 3.28084 ft ...than

answer will come in meter than convert it into kilo meter

The concentration will be 156 minutes later when the rate at which a certain drug is eliminated by the body follows first-order kinetics, with a half life of 78 minutes is 0.275 ug/mL

Half life: It is known as the time needed to minimize the initial concentration to half. It is denoted by the symbol t1/2

For a first order reaction,

t1/2=0.693/k1

The half-life time for a first order reaction is unaffected by the substrate's starting concentration.

Half life of the given drug is 78 min

Total time is 156 min

Number of half lives corresponding to 156 min is 156/78=2

Therefore, the concentration of drug reduced in 156 min =2^2=4 times

Therefore, the number of half-life is present in the given total time is determined by dividing the total time with half-life of the drug.

The initial concentration is 1.1 ug/mL

Final concentration is 1.1/4=0.275 ug/mL

The concentration of drug after 156 min is 0.275 ug/mL

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The density  of the rectangular  solid is 0.378 g/ [tex]cm^3}[/tex] .

Density of rectangular solid is calculated by ratio of mass by volume of the of rectangular solid .

Density = mass / volume

mass = 74.319 g ( given )

length of the rectangular solid =  9.14 cm

wide of the rectangular solid = 3.82 cm

height of the rectangular solid  = 5.63 cm

volume = length × width × height  =  9.14 cm  × 3.82 cm × 5.63 cm

volume = 196.57 [tex]cm^3}[/tex]

putting the value of mass and volume in equation ( i ) we get ,

Density = mass / volume

Density = 74.319 g / 196.57 [tex]cm^3}[/tex]  = 0.378 g/ [tex]cm^3}[/tex]

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Answer:

D

Explanation:

most reasonable answer

The correct interpretation of Friar Lawrence's statement in Act III of Romeo and Juliet is: A. Angry people will not listen to reason.

In this scene, Friar Lawrence is expressing his frustration and realization that rational arguments and advice are ineffective when dealing with people who are consumed by anger or driven by their emotions. He sees that Romeo, who is filled with grief and rage after being banished, is not receptive to his reasoning and is acting impulsively.

The line suggests that when people are in a state of madness or extreme emotional turmoil, they become deaf to rational counsel and are unlikely to heed any advice or guidance.

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Answer:

Cell are too small to see without a micrscope

Explanation:

Cuz I learned in school

The following which is not one of the basic points of Cell Theory is cells are too small to see without a microscope. Hence option c is correct.

Microscope is defined as a lab tool for inspecting things that are too small to be seen with the eye. The study of small objects and structures under a microscope is known as microscopy. Being microscopic means being difficult to see without a microscope. A specimen that has been placed on a slide is seen, magnified, and imaged using the microscope's optical components.

Cell theory is defined as a cells are believed to be the primary building blocks of all living tissues according to a basic biological scientific hypothesis. The essential unit of structure and function in living things is the cell, according to the current Cell Theory, which is widely recognized. One or more cells make up every living thing. Cellular division creates new cells from existing ones.

Thus, the following which is not one of the basic points of Cell Theory is cells are too small to see without a microscope. Hence option c is correct.

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Answer:They occur when the Earth, the Sun, and the Moon are in a line. The gravitational forces of the Moon and the Sun both contribute to the tides.Spring tides occur during the full moon and the new moon. During the moon's quarter phases the sun and moon work at right angles, causing the bulges to cancel each other.

Neap tides occur during the first and third quarter moon, when the moon appears "half full." NOAA's tide and tidal current predictions take into account astronomical considerations due to the position of the moon and the sun.

Explanation:

Answer: As the water molecules gain energy, they can escape from the attractions of their neighbors and change into a more fluid state.

Explanation: have a wonderul day !

Answer:

Cu3(PO4)2

The mass of the snow flakes that accumulates in one hour is 15552 Kg.

We know that area is the product of the length and the breadth of the lawn. We have to first obtain the area of the lawn as;

Length = 20.0 feet  

Width =  18.0 feet

Area =  20.0 feet   *  18.0 feet  = 360 square feet

If 1 square feet accumulates 450 new snowflakes every minute

360 square feet accumulates 360 square feet *  450 new snowflakes every minute/ 1 square feet

= 162000 new snowflakes every minute

If 162000 new snowflakes accumulates in one minute

x snow flakes accumulates in 60 minutes

x = 9720000new snowflakes

If 1 snow flake has a mass of 1.60 mg

9720000 new snowflakes has a mass of  9720000 snowflakes *  1.60mg/ 1 snow flake

= 15552000 mg or 15552 Kg

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Answer:

40 km in a hour?

Explanation:

The empirical formula of the given ions and name of their compounds are given below:

Empirical formula is the simplest formula of a compound where the elements in the compounds are shown in their simplest combining ratios.

The empirical formula of some compound are equal to the molecular formula of the compound whereas in some other, compounds, the empirical formulas are multiples of the molecular formula.

The empirical formula of the given ions and name of their compounds are given below:

Cation: Co³⁺; Anion; PO³⁻ ; Empirical formula : CoPO₄; Name : Cobalt (iii) phosphate

Cation: Fe²⁺  Anion; CrO₄²⁻  Empirical formula : FeCrO₄ ; Name : Iron (ii) tetraoxochromate (vi)

Cation: Cu²⁺  Anion; OH⁻  Empirical formula : Cu(OH)₂ ; Name : Copper (ii) hydroxide

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The atoms of covalent compounds are connected by covalent bonds. Sharing one or more pairs of valence electrons results in the formation of a covalent bond.

How to name covalent compound-

1. Give the elemental name of the non-metal that is on the periodic table that is farthest to the left.

2. Give the other non-metal's name and a suffix ending, such as -ide.

3. To denote the quantity of an element in a molecule, use the prefixes mono-, di-, tri-, etc.

4. Mono is understood and not written if it is the initial prefix.

Names of covalent compounds according to the question-

1. CO₂ - Carbon Dioxide

2. CO - Carbon Monoxide

3. N₂O₄ - Dinitrogen tetraoxide

4. PCl₃ - Phosphorus trichloride

5. CBr₄ - Tetra bromomethane

6. P₂O₅ - Phosphorus pentoxide

7. PCl₅ - Phosphorus pentachloride

8. NF₃ - Nitrogen Trifluoride

9. SO₂ - Sulfur dioxide

10. SO₃ - Sulfur trioxide

11. SCl₆ - sulfur hexachloride

12. SiCl₄ - Silicon tetrachloride

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The spontaneous fission reaction is:  

₉₈ Cf ²⁵² → ₅₄ Xe ¹⁵⁰+ ₄₄ Ru ¹⁰⁸ +4 ₀n¹

Given,

Californium-252 undergoes spontaneous fission to produce xenon-140, ruthenium-108, and an unknown number of neutrons.

The Nuclear reaction is

₉₈ Cf ²⁵² → ₅₄ Xe ¹⁵⁰+ ₄₄ Ru ¹⁰⁸ +4 ₀n¹

Spontaneous fission reaction always happens in heavier elements, that is the element with atomic numbers more than 89 and mass numbers greater than 230.

The nuclei of these elements are unstable and decay by radioactive decay in different forms like beta decay, positron, etc. At some percentage of the time, they decay by spontaneous fission.

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Answer:

C

Explanation:

C is the right answer for this question.

Gold has a density of 19.2 gm/cm.

The necklace weighs 19.21 g.

Water was initially present in 20.8 ml.

22 ml is the total amount of water.

Due to its great density, which results from the fact that each of gold's atoms is individually highly heavy, gold is referred to as a heavy metal.

(a) The necklace's volume is 22 - 20.8 ml.

- The density of a necklace is determined by its mass and volume.

The necklace's density is 19.21 divided by 1.2.

Necklace has a density of 16 gm/ml.

(b) The necklace is constructed of alloy rather than pure gold.

This is due to the necklace's varied density from that of pure gold.

It follows that the necklace contains something else in addition to the gold.

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Answer:

Methanol

Explanation:

Methanol is a compound and compounds are pure substances formed by the combination of elements; they can be decomposed by ordinary chemical means. The other answers are incorrect because they are elements and elements consists of only one kind of atom and they cannot be broken down into a simpler type of matter by either physical or chemical means.

A metal (M) forms a compound with formula MCl₂. The compound contains 57.69% Cl by mass and the metal is Chromium. Symbol of Chromium metal is Cr.

Given :

57.69 % Cl by mass means that 57.69 grams of chlorine present in 100 grams of compound.

Mass of compound = 100 g

Mass of chlorine = 57.69 g

Mass of metal = 100 - 57.69= 42.31 g

First, we will calculate the moles of chlorine, using formula

Moles = Given mass

              molar mass

Moles = 57.69

              35.45

Moles = 1.627 moles

The given formula of compound is, MCl₂

Therefore, ratio of M : Cl = 1 : 2

We will calculate the moles of metal,

2 moles of Cl combines with 1 mole of metal

1.627 mole of Cl combines with 1.627 = 0.813 mole of metal

                                                        2

calculate the molar mass of metal -

Molar mass of metal =   Given mass  

                                           moles

Molar mass = 42.31  g     = 52.04 g/mol

                       0.813 mol

The molar mass of metal is 52.04 g/mole.

From this, we can conclude that the metal is Chromium (Cr)  

So, the formula will be, CrCl₂

Hence, the identity of the metal is Chromium (Cr)

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The severity of a tropical storm is related to the depressed atmospheric pressure at its center, then the volume of the balloon is 4.164 L.

Pressure is defined as the force applied perpendicular to the surface of an object per unit area over which the force is distributed.

Volume is defined as the space occupied by the boundary of the object in 3D space.

For ideal gas the equation is P1V1 = P2V2

The pressure of center of Odessa storm is

P(in) = P(atm) - 40mbar = 1.0325 - 40.0 x 10⁻³bar = 0.97325 bar

On applying ideal gas equation

P(in)V(in) = P(out)V(out)

V(in) = P(out)V(out) / P(in)

       = 1.01325 bar x 40.0 L / 0.97325

       = 4.164 L.

Thus, the severity of a tropical storm is related to the depressed atmospheric pressure at its center, then the volume of the balloon is 4.164 L.

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Answer:

Explanation:

[tex]{ \rm{MCO_{3(s)} + HX _{(aq)} \: \rightarrow \: MX_{(s)} + CO _{2(g)} + H _{2}O _{(l)} }}[/tex]

- MCO_3; Can be any metal carbonate such as Magnesium carbonate, Aluminum carbonate.....

- HX; can be any acid such as sulphuric acid, hydrochloric acid, nitric acid.....

- MX; is a metal acidic salt such as magnesium sulphate from magnesium carbonate and sulphuric acid, Aluminum chloride from Aluminum carbonate and hydrochloric acid.

Fluorine has a smaller ionic radius than oxygen, because the attraction between protons and valence electrons is stronger; option B

Ionic radius is the radius of an ion of an element given by the distance from the nucleus up to where the nucleus has an influence on the ion's electron cloud.

The ionic radius of ions of elements depends on;

The greater the nuclear charge, the smaller the ionic radius.

The greater the electron shielding effect, the greater the ionic radius.

For non-metallic  ions just as in metallic ions, the ionic radius decreases from left to right across the period table as a result of the increase in the nuclear charge of the ions.

Also, the ionic radius of nonmetals increase on going down the same group in the periodic table due to to increase in electron shielding as well as addition of an extra electron shell.

Therefore, the ionic radius of fluorine will be smaller than that of oxygen because of a greater nuclear charge.

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The beryl species includes such well-known gemstones as aquamarines, emeralds, and morganites.

Gemstones are synthetic mineral crystals that have been cut and polished for use in jewelry or other adornments. It is also referred to as a superb gem, jewel, expensive stone, and semiprecious stone.

But even though they are not minerals, other rocks like lapis lazuli, opal, and obsidian, as well as occasionally biological materials like amber, jet, and pearl, are regularly used to make jewelry and are frequently regarded as gemstones.

Although soft minerals are more uncommon than hard gemstones, some of them are utilized in jewelry because of their brilliance or other aesthetically pleasing physical properties. Another quality that raises the value of diamonds is rarity. Another factor is reputation.

Along with jewelry, the two main categories of luxury art in early antiquity were hardstone sculptures and engraved jewels.

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H₃PO₄ is a Phosphoric acid and its Basicity is 3.

The basicity of a molecule is determined by the number of acidic hydrogen atoms present. The quantity of acidic hydrogen atoms in a substance is what determines its basicity.

To become acidic, a hydrogen atom must establish a very strong electronegative bond with an oxygen or fluorine atom. H₃PO₄ is acidic because the hydrogen atoms are bonded to or united to three oxygen atoms as a result. H₃PO₄ thus has a basicity of 3. Due to the fact that H₃PO₄ has a basicity value of 3, it is a tribasic acid. The ability of a base to replace a number of hydrogen atoms in a certain acid is known as the basicity process. In H₃PO₄, there are three atoms therefore, the basicity is 3.

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Answer:

Studies have revealed that evaporation—the process by which water changes from a liquid to a gas—from oceans, seas, and other bodies of water (lakes, rivers, streams) provides nearly 90% of the moisture in our atmosphere. Most of the remaining 10% found in the atmosphere is released by plants through transpiration.

Explanation:

On converting 23.4 kilojoules of energy into calories we get 5.6 calories of energy.

We have energy in kilojoules.

We have to convert it into calories.

In 1 kilojoules there are 0.239 calories.

According to the question -

Energy in kilojoules = 23.4 kJ

In order to find the equivalent energy in calories, multiply 23.4 by 0.239 -

23.4 x 0.239 = 5.6 calories.

Hence, in 23.4 KJ there are 5.6 calories.

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