Single-crystal sapphire has a melting point of aorund 2323K what is the melting point in degrees Celsius?

The balanced molecular reaction is just made of the species as they appear in the chemical equation, with coefficient on the front so we can have the same number of atoms for each elements at the left and the right of the arrow:

2NaOH(aq) + MgCl₂(aq) → Mg(OH)₂(s) + 2NaCl(aq)

The total ionic equation is made by dissociating the ions of the aqueous species:

2Na⁺ + 2OH⁻ + Mg²⁺ + 2Cl⁻ → Mg(OH)₂(s) + 2Na⁺ + 2Cl⁻

The net ionic equation is made by cancelling out the ions that are found at the right and the left of the arrow:

Mg²⁺ + 2OH⁻ → Mg(OH)₂(s)

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Answer:

The mass of strontium iodate = 496.07 grams

Explanation:

The balanced equation for the reaction is :

[tex]2RbIO3+Sr(NO_{3})_{2}\rightarrow 2RbNO_{3}+Sr(IO_{3})_{2}[/tex]

Molar mass = mass of substance present in 1 mole of the compound , is called the molar mass.

Here RbIO3 = rubidium iodate

Sr(NO3)2 = strontium nitrate

Sr(IO3)2 = strontium iodate

Molar mass of Sr(NO3)2 = 211.63 g/mol

1 mole Sr(NO3)2 = 211.63 g

Molar mass of Sr(IO3)2 = 437.43 g/mol

1 mole of  Sr(IO3)2 = 437.43 g

According to the balanced equation ,

2 mole RbIO3 = 1 mole Sr(NO3)2 = 2 mole RbNO3 = 1 mole Sr(IO3)2

Hence

1 mole of Sr(NO3)2 is producing = 1  mole  Sr(IO3)2

211.63 gram of Sr(NO3)2 will produce =  437.43 gram Sr(IO3)2

1 gram of Sr(NO3)2 will produce:

[tex]=\frac{437.43}{211.63}[/tex]

240 grams of Sr(NO3)2 will produce:

[tex]=\frac{437.43}{211.63}\times 240[/tex] grams of  Sr(IO3)2

= 496.07 grams of  Sr(IO3)2

The mass of strontium iodate = 496.07 grams

Molar mass calculation :

Sr(NO3)2 = Mass of Sr + 2(Mass of N)+ 6(Mass of O)

= 87.62 +2(14)+6(16)

=211.63 gram/mole

Answer:loss of electrons bucause i dont think it would be the other one at all

Explanation:

If you are referring to a "net gain or loss of electrons" in the context of chemical reactions or electron transfer:

A net gain of electrons occurs when an atom, ion, or molecule receives one or more electrons during a chemical reaction. This is often associated with the reduction half-reaction in redox reactions, where a substance gains electrons and typically reduces in charge or oxidation state.

A net loss of electrons occurs when an atom, ion, or molecule loses one or more electrons during a chemical reaction. This is often associated with the oxidation half-reaction in redox reactions, where a substance loses electrons and typically oxidizes in charge or oxidation state.

In a redox reaction, one substance is oxidized (loses electrons), and another substance is reduced (gains electrons). The net gain or loss of electrons in such reactions depends on the specific substances involved.

If you are referring to a "net gain or loss of electrons" in a broader or more general sense:

A net gain of electrons implies that the total number of electrons in a system has increased, meaning that more electrons are present in the system than before.

A net loss of electrons implies that the total number of electrons in a system has decreased, meaning that fewer electrons are present in the system than before.

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In case of popsicle and alcohol, heat is absorbed from the surrounding.

In case of lava heat is emitted into the surrounding.

Melting of popsicle is just a change of state from solid to liquid. This is the phenomenon which occurs when the popsicle gets the heat from the surrounding and it absorbs the heat, thereby turning into liquid. So it absorbs heat from the surrounding.

The alcohol when spread on the skin evaporates into vapour. This is the phenomenon of evaporation which occurs when alcohol absorbs heat from the surrounding and thereby turning into vapour.

Similarly, when lava solidifies into solid, the change of state occurs. As lava emits heat into the surrounding, the temperature of the lava goes down, thereby changing it into solid. So it emits heat into surrounding.

Explanation:

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Answer: A

Explanation: Chemical bonds can form when there is a transfer or sharing of electrons since there are different kinds of chemical bonding and not all involve the sharing or transfer of electrons, as in interstitial bonding, and some coordination compounds.

Answer: The mixing of gas molecules due to random motion (a)

Explanation:

The molecules and the particles of the substances move due to diffusion. It involves the mixing of gas molecules due to random motion. Thus, option A is correct.

Diffusion is the process of spreading and mixing the particles of the matter from a region of high to lower concentration. The process of diffusion depends on pressure and concentration.

The molecule passes from a higher region of concentration by passing a membrane to a region that has a lower region of the gaseous particles.

The concentration gradient plays an important role in the diffusion and is a random movement that allows the net flow of the particles based on the concentration of the solute.

Therefore, option A. the mixing of molecules due to random motion is diffusion.

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Answer:

D.) The original components retain their individual properties

Explanation:

A pure substance is a substance of constant chemical composition throughout its mass some of the examples of the pure substances are iron, water, oxygen gas, nitrogen gas etc.

A pure substance can in the form of solid, liquid or gas which have constant property. Two or more pure substances combines together to from a mixture after which is not said to be pure substance

For example the one or more atom of the same element is said to be pure but the molecule of two different elements is not said to be a pure substance as they have different property of both of the elements like H2 and H2O where H2 is a pure substance and H2O is not a pure substance.

The pure shows their individual property if they are not combined with other elements or substance as it will not posses individual property.

Answer:

27 electrons

Explanation:

A copper ion with a charge of +2 has 29 protons and 27 electrons. The atomic number of an element is equal to the number of protons in the nucleus of each atom of that element.

Answer:

A Carbon atom has 29 electrons

Explanation: The number of protons of any given element is equal to the number of electrons. In this case there are 29 protons in the Carbon atom, so in return there are 29 electrons.

Answer:

Vegetable oil

Explanation:

because it is nonpolar object

Answer:

Volume of acid Va = 38.70cm3,

Concentration of acid Ca = 1.90M

Volume of Base Vb = 10.30cm3

Concentration of base Cb = ?

Equation of the reaction

H2SO4 + 2NaOH = Na2SO4 + 2H2O

No of mole of acid Na = 1

No of mole of base Nb = 2

CaVa/CbVb = Na/Nb

Cb = CaVaNb/VbNa

Cb = 1.9*38.7*2/10.30*1

Cb = 14.2777M

Explanation:

The molarity of H2SO4 in the question is calculated using the stoichiometry of the neutralization reaction and the definition of molarity, yielding a result of 3.57 M.

According to the neutralization reaction, one molecule of H2SO4 reacts with two molecules of NaOH. This gives us a stoichiometric ratio of mol NaOH: mol H2SO4 = 2:1.

The moles of NaOH used in the reaction can be calculated using its molarity and volume: 1.90 mol/L * 38.7*10- 3 L = 0.07353 mol.

This means there were 0.07353/2 = 0.036765 mol H2SO4 in the 10.30cm³ of solution.

The molarity of H2SO4 can then be calculated using its definition (mol/L) as 0.036765 mol / 10.3*10-3 L = 3.57 M

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Answer:

A change in speed and direction between atleast one of the objects

Explanation:

Final answer:

To find evidence of a stationary object's contact interaction, check for changes in motion, identify contact forces, use collision mechanics and momentum conservation laws to infer interactions, and examine the object's boundary for contact points.

Explanation:

To determine whether a stationary object is involved in a contact interaction, there are several pieces of evidence you can look for. Contact forces must touch or be in contact with an object to cause a change. Some signs of contact interactions include observing a change in an object's state of motion, such as a stationary object starting to move, or a moving object changing direction or speed after an interaction.

Examples of contact forces are normal reaction, friction, tension, and applied forces. For instance, during a collision, two objects exert forces upon each other, and these forces can affect their respective velocities. This interaction conserves momentum if no external forces are acting.

If you cannot directly observe an interaction, you can infer it has occurred by examining the evidence left behind. For example, if you have a scenario where an object of known mass m2 is initially stationary, and after an interaction with another mass m1, you see that m1 has been deflected at a certain angle with a specific speed, you can use conservation of momentum and kinematics to deduce the magnitude and direction of mass m2's velocity post-collision.

Another way to identify contact interactions is by making a drawing of the object and drawing a dashed boundary line around it that separates it from its environment. By examining points on this boundary line, you can identify where other objects might have come into contact with it, indicative of contact forces. Additionally, checking for the presence of a normal force or frictional force will also suggest a contact interaction has occurred.

Answer: The health code covers all issues except Exporting foods

Explanation: Health codes are a set of standards established and enforced by government for health requirements. It is a model for safeguarding public health and ensuring food is unadulterated and honestly presented when offered to the consumer.

Food and Drug Administration is the regulatory body in charge in the USA and their jurisdiction is only limited within the country.

The Code establishes definitions; sets standards for management and personnel, food operations, and equipment and facilities; and provides for food establishment plan review, permit issuance, inspection, employee restriction, and permit suspension.

Health codes address a plethora of public health issues, including measures for workers' health and safety, regulations for importing and exporting foods, and how to handle food service complaints.

Health codes cover a vast range of issues and regulations that relate to the health and safety of the public. This includes workers' health and safety, importing and exporting foods, and food service complaints. These codes aim to uphold hygiene, safety, and good practice in the food service industry, which includes ensuring safe practices are being followed by staff members (workers' health & safety), the quality and integrity of foods being exported/imported, as well as addressing customer complaints regarding the service of food.

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Answer:

                     2.288 Moles of NH₄NO₃

Explanation:

The Balance chemical equation is as follow:

                  (NH₄)₂CO₃ + 2 HNO₃  →  2 NH₄NO₃ + H₂O + CO₂

To solve this problem we will do following steps:

Finding moles of Ammonium Carbonate:

As we know,

                        Moles  =  Mass / M.Mass

So,

                        Moles  =  110 g  /  96.08 g/mol

                        Moles  =  1.144 moles

Calculating moles of Ammonium Nitrate:

According to balance chemical equation;

                      1 mole of (NH₄)₂CO₃ produces  =  2 moles of NH₄NO₃

So,

          1.144 moles of (NH₄)₂CO₃ will produce  =  X moles of NH₄NO₃

Solving for X,

                     X =  2 moles × 1.144 moles ÷ 1 mole

                     X  =  2.288 moles of NH₄NO₃

Answer:

Atoms with high electro negativity

Answer: Nonmetallic elements

Explanation: Covalent bonding happens on two nonmetallic elements in which they exhibit sharing of valence electrons to become octet or stabe

Answer:

22.11 L

Explanation:

Data Given:

no. of moles of Krypton  = 0.987

Liters of Krypton gas (volume) = ?

Solution:

we will volume of gas

Formula used

          no. of moles = Volume of gas / Molar volume

Rearrange the above equation to find volume

          Volume of gas = no. of moles x Molar Volume . . . . . . (1)

Where

Molar volume = 22.4 L /mol

Put values in above equation 1

          Volume of gas = 0.987 mols x 22.4 L /mol

          Volume of gas = 22.11 L

So,

 Volume of Krypton gas = 22.11 L

Explanation:

one molecule of H2 I think

Explanation:

Seems to me like you have 8H and 2N. You need 3H for every N so 6H total. 8H-6H=2H which is one molecule of H2.

Answer:

The time taken for the vehicle to pull a 500 N rock 100 meters is :

t = 5 sec

Explanation:

Work = The magnitude of work is given by the product of force and displacement .

W = F x s

F = Force in Newton"N"

s = displacement "s"

In the question : F = 500 N  and s = 100 m

W = F x s

W = 500 x 100

W = 50000 Nm

W = 50000 J

Power : It is the rate of doing work.The expression of power is given by :

[tex]Power=\frac{Work}{time}[/tex]

[tex]P = \frac{W}{t}[/tex]

W = Work = 50000 J

t = time

P = power = 10,000 Watt

Put the value in the formula:

[tex]P = \frac{W}{t}[/tex]

[tex]t = \frac{W}{P}[/tex]

[tex]t = \frac{50000}{10,000}[/tex]

t = 5 sec

Answer: 0.33M CaBr2

Explanation: Molarity is expressed in moles of solute over liter solution.

M= n solute / L solution

Solution:

First convert mass of CaBr2 to moles using its molar mass

Ca = 40

Br = 80 x 2 answer is 200 g CaBr2.

50.0g CaBr2 x 1 mole CaBr2 / 200 g CaBr2 = 0.25 moles CaBr2

Next convert mL to L

750.0 mL x 1L / 1000mL

= 0.75 L

Substitute the values for M.

M= 0.25 moles CaBr2/ 0.75 L

= 0.33 M CaBr2

The Giant Impact Hypothesis posits that the Moon was formed from the debris from a collision between Earth and a Mars-sized object 4.5 billion years ago, which impacted the Moon's orbit and tilt. This tilt affects the occurrence of eclipses because it prevents the Moon, Earth, and Sun from always aligning perfectly. Without the tilt, there would be an eclipse during every full and new moon phase.

The Giant Impact Hypothesis suggests that the Moon was formed from the debris resulting from a collision between the Earth and a Mars-sized object about 4.5 billion years ago. This event is thought to have caused significant effects on the Moon's orbit and its characteristics, including its tilt. This tilt affects the occurrence of eclipses.

During a solar eclipse, the Moon, Earth, and Sun align in a straight line. However, because the Moon's orbit is tilted at about 5 degrees to the Earth's orbit, it does not always cast a shadow on the Earth when it passes between the Earth and the Sun. This is also the case in a lunar eclipse where the Earth is between the Sun and the Moon.

Without this tilt, we would experience a solar and lunar eclipse with every full and new moon phase respectively. Therefore, the Moon's tilted orbit plays a crucial role in the formation of solar and lunar eclipses.

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To find the number of atoms in 3.45 g of CO2, we use the concept of moles and Avogadro's number. The number of atoms is approximately 4.71 x 10^22 atoms.

To determine the number of atoms in 3.45 g of CO2, we need to use the concept of moles. Firstly, we need to find the molar mass of CO2, which is approximately 44 g/mol. Next, we can use the formula:

No. of moles = mass / molar mass

Substituting the given values, we get:

No. of moles = 3.45 g / 44 g/mol ≈ 0.078 mol

Finally, we can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10^23 particles (atoms or molecules):

No. of atoms = No. of moles x Avogadro's number ≈ 0.078 mol x 6.022 x 10^23 atoms/mol ≈ 4.71 x 10^22 atoms

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Metals are located on the left of the periodic table, and nonmetals are located on the upper right.

Explanation: Metals: Lustrous (shiny)

Good conductors of heat and electricity.

High melting point.

High density (heavy for their size)

Malleable (can be hammered)

Ductile (can be drawn into wires)

Usually solid at room temperature (an exception is mercury)

Opaque as a thin sheet (can't see through metals)

Nonmetals: High ionization energies.

High electronegativities.

Poor thermal conductors.

Poor electrical conductors.

Brittle solids—not malleable or ductile.

Little or no metallic luster.

Gain electrons easily.

Dull, not metallic-shiny, although they may be colorful

Answer:

4 tabletes/dose

Explanation:

mass person = (90 Lb)×(Kg/2.20462 Lb) = 40.823 Kg body

amount of medicine = 50 mg/Kg body.day

frecuency = 2 dose/day

⇒ amount of medicine/day =  (50 mg/kg body.day)×(40.823 Kg body) = 2041.168 mg/day

⇒ mg medicine/dose = (20141.168 mg/day)×(day/ 2 dose) = 1020.584 mg medicine/dose

∴ mg medicine/tablet = 250 mg medicine/tablet

⇒ # tabletes/dose = (1020.584 mg medicine/dose)×(tablet/250 mg medicine) = 4.082 tabletes/dose

⇒ # tabletes/dose ≅ 4 tabletes/dose

The soup should be cooled down to 41°F or lower in the next four hours after being cooled to 70°F in the first two hours. This two-stage cooling method prevents bacterial growth and keeps food safe for consumption.

The question you've asked pertains to safe food storage guidelines, particularly cooling temperatures for prepared foods. After a large pot of soup has been cooled to 70°F within two hours, the U.S. Food and Drug Administration (FDA) recommends that the soup must reach a temperature of 41°F or lower within the next four hours. This second stage of cooling is crucial to prevent the growth of bacteria and to keep the food safe for consumption. This is part of the 'two-stage cooling method', which is recommended for foods like soup to go from their cooked temperature down to a safe refrigerator-storage temperature (40°F or below) within six hours.

This is important to prevent the growth of harmful bacteria such as C. botulinum, which can be present in foods that have not been cooled properly. Keep in mind that after cooling, proper reheating is required to kill any bacteria that may have grown. The minimum reheating temperature usually suggested is 165°F.

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To properly cool and prevent bacterial growth, the pot of soup must be cooled to below 4 degrees C (40 degrees F) within the next four hours after it has been cooled to 70 F (21 C) within two hours.

The temperature the soup must reach to be cooled properly is below 4 degrees C (40 degrees F). According to food safety guidelines, perishable foods should not be left at a temperature between 4 and 60 degrees C (40 and 140 degrees F) for more than two hours. Within four hours of beginning the cooling process, the soup should be cooled to refrigerator-safe temperatures to prevent the formation and multiplication of microorganisms, particularly bacteria that thrive in that mid-range temperature 'danger zone'.

Therefore, if the food worker has cooled the soup to 70 F (21 C) within two hours, they must ensure that it reaches the safe refrigeration temperature of 40 degrees F or lower within the next four hours to adhere to proper cooling practices and maintain food safety.

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Answer:

C it is increasing the amount of 400 to 300 by taking away 100

Final answer:

When the temperature of a gas decreases from 400 K to 300 K according to Charles's law, the volume would decrease proportionally to 3/4 of its original value.

Explanation:

According to Charles's law, which describes the relationship between the volume and temperature of a gas, the volume is directly proportional to its temperature on the Kelvin scale when pressure is constant. This means that if the temperature of the gas decreases, the volume will also decrease proportionally. Thus, if the temperature decreases from 400 K to 300 K, which is a reduction to ⅔ (or 3/4) of the original temperature, the volume will similarly decrease to 3/4 of its original value. Therefore, the correct answer to what would happen to the volume of the gas is:

D. The volume would be 3/4 of its original value.

Answer clouds

Explanation: because that’s a really common place where clouds are

Answer: Cu3PO4

Explanation: Copper has an oxidation of Cu+1 and Phosphate a polyatomic ion is PO4 -3

Do the criss cross rule on their charges as the charge of Copper will be the subscript pf PO4 and vice versa.

Answer:

I think it will be d 12% it will be true

Answer:

12%

Explanation:

Answer:

4

because

2*2

= 4

Essentially if each square is worth 1 unit then we can multiply to find how many square there will be in a 2 by 2 grid.

2 * 2 = 4

Best of Luck!

Answer:

Chemical equations need to be balanced so that they follow the law of conservation of mass.