Introduction:

Define the following terms:

Chemical reaction,
reactant,
product,
precipitate,
Law of Conservation of Mass

Ne, Ar, and Kr share properties and the number of electrons in their outermost energy level because they belong to the same group (noble gases). Therefore, option A is correct.

Any of a class of rare gases with high stability and very low reaction rates, such as helium, neon, argon, krypton, xenon, and occasionally radon. also known as the inert gas.

Noble gases are low chemically reactive, odorless, colorless, nonflammable, and monotonic gases. Noble gases are exceedingly stable and unlikely to form chemical connections since they have the minimal inclination to receive or lose electrons. Hence, option A is correct.

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Explanation:

Refer to pic...........

Answer:

To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.

First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:

0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms

Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).

Explanation:

The total number of the ions in the 3.93 mol of the MgCl₂ is 7.09 × 10²⁴ ions .

The chemical equation is as follows :

MgCl₂ --->  Mg⁺  +  2Cl⁻

The total number of the ions of  MgCl₂ = 1  Mg⁺ + 2 Cl⁻

The total number of the ions of  MgCl₂ = 3 ions

The number of the moles of the MgCl₂ = 3.93 mol

1 mole of the substance = 6.022 × 10²³ ions

The total number of the moles of substance = 3 × 3.93 × 6.022 × 10²³ ions

The total number of the moles of ions = 7.09 × 10²⁴ ions

Thus, the  total number of  the ions of the  MgCl₂ is 7.09 × 10²⁴ ions .

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Answer:

D. The base isolation system prevents the building from coming into direct contact with the shaking ground.

Explanation:

During an earthquake, the ground moves rapidly and can cause significant damage to buildings and infrastructure. A base isolation system is a technique used to protect buildings and other structures from earthquake damage by reducing the amount of shaking they experience. The system involves isolating the building's foundation from the ground using flexible bearings, springs, or pads. This helps to decouple the building from the shaking ground and reduce the amount of energy that is transferred to the structure during an earthquake. By preventing direct contact between the building and the ground, the base isolation system can help to minimize damage to the building and improve its chances of survival during a seismic event.

Answer: D

Explanation: The base isolation system prevents the building from coming into direct contact with the shaking ground. RAHHHHHHHHH

The next full moon will occur around July 14, which is answer choice C.

The moon is a natural satellite of the Earth, meaning it is a celestial body that orbits the Earth. It is the fifth largest moon in the solar system and is the largest relative to the size of its host planet.

The moon is approximately one-quarter the size of the Earth and is the closest astronomical object to the Earth.

If the moon is half full on June 15, then we can determine the next full moon by adding approximately 29.5 days to June 15, which is the average length of time for the moon to complete a full cycle of phases.

So, the next full moon will occur around July 14, which is answer choice C.

Therefore, option C is the correct answer.

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The beta decay of potassium 40 produces a beta particle and an atom with an atomic number of 19.

So option C is correct answer.

What is Atomic Number?

The atomic number is the number of protons found in the nucleus of an atom of a chemical element. It is a fundamental property of an element, which determines its identity and its position in the periodic table.

Each element has a unique atomic number, which is represented by the symbol Z. For example, the element hydrogen has an atomic number of 1, which means that it has one proton in its nucleus. The element carbon has an atomic number of 6, indicating that it has six protons in its nucleus.

potassium that undergoes beta decay. During beta decay, a neutron in the nucleus of the potassium 40 atom is converted into a proton, and a beta particle (which is an electron) is emitted. The resulting atom has one more proton in its nucleus than the original atom, so its atomic number increases by one to 20.

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Using  hypothetical scenario, the Separation of  the Pennie’s are given below

Pennies dated after 1982 are lighter and thinner because zinc is less dense than copper. However, they have a similar diameter of 19.05mm to pennies dated before 1982. The difference in composition between the two groups is important because copper is a valuable metal, and the cost of producing a penny exceeded its value. By reducing the amount of copper in pennies, the U.S. Mint was able to save money on production costs.

Pennies dated before 1982 are made of 95% copper and 5% zinc and weigh 3.11 grams. They have a diameter of 19.05mm and a thickness of 1.55mm. Pennies dated after 1982 are made of 97.5% zinc and 2.5% copper and weigh 2.5 grams. They have a diameter of 19.05mm and a thickness of 1.52mm.

Therefore, the main difference between the two groups is their composition, weight, and thickness. The pennies dated before 1982 are larger, heavier, and thicker than those dated after 1982.

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the number of moles of EDTA required to titrate the water sample is 0.0000872 moles.

We can use the equation for molarity to calculate the number of moles of EDTA required to titrate the water sample:

Molarity = moles of solute / liters of solution

First, we need to calculate the number of liters of EDTA solution used in the titration:

19.840 mL = 19.840 mL x (1 L / 1000 mL) = 0.019840 L

Next, we can use the equation for molarity to solve for the number of moles of EDTA:

Molarity = 4.395x

[tex] {10}^{3} [/tex]

M

Liters of solution = 0.019840 L

moles of solute = Molarity x liters of solution

moles of EDTA = (4.395x

[tex] {10}^{ - 3} [/tex]

M) x (0.019840 L) = 8.720x

[tex] {10}^{ - 5} [/tex]

moles

Therefore, the number of moles of EDTA required to titrate the water sample is 8.720x

[tex] {10}^{ - 5} [/tex]

moles (or 0.0000872 moles) to three significant figures.

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Answer: b

Explanation:

20.0g AlCl3/133.5715 g Alcl3 = .149732540 moles AlCl3

M=mol/L  = 0.149732540/0.500=0.30

133.4515 (molar mass for AlCl3 from periodic table)

Answer:the second answer is boiling point elevation

the third answer is two sugar cubes

Explanation:

Answer:

As-81 undergoes radioactive decay with a half-life of 33 seconds. This means that after 33 seconds, half of the original sample would have decayed, and after another 33 seconds, half of the remaining sample would have decayed, and so on.

To find the percent of the sample that remains un-decayed after 43.2 seconds, we can use the following formula:

percent remaining = (1/2)^(t/h) x 100%

where t is the time elapsed and h is the half-life.

Substituting the given values, we get:

percent remaining = (1/2)^(43.2/33) x 100%

percent remaining ≈ 23.2%

Therefore, about 23.2% of the As-81 sample remains un-decayed after 43.2 seconds.

Explanation:

The condensed formula and IUPAC nomenclature for the chemical ethyl alcohol are [tex]C_{2} H_{6} O[/tex].

Condensed structural formulae, which conserve space and are easier and faster to type out, display the atoms' positions similarly to a structural formula but on a single line. When demonstrating how a group of atoms in a molecule are linked to a single atom, condensed structural formulae are also helpful.

The hydrogens (or other ions or groups) that are connected to the carbon atoms are immediately next to one another in condensed chemical formulations. The corners and endpoints of lines are assumed to have carbon atoms in line-angle formulae. As each carbon atom is connected to four hydrogen molecules in total, it is assumed that each one has four bonds.

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The number of moles of aluminum chloride that forms when 81g of aluminium reacts is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, aluminium reacts with chlorine to produce aluminum chloride.

Based on the balanced equation, 2 moles of aluminum produces 2 moles of aluminium chloride.

81 g of aluminium is equivalent to 3 moles of aluminum

This means that 3 moles of aluminum chloride will be produced if 3 moles of aluminum reacts.

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Answer:

A. sunlight

Explanation:

The source of nearly all of the energy for producers and consumers is sunlight

Answer: .38 atm

Explanation:

p2= p1 x t2 / t1

0.45 x 259.15 / 303.15

I feel confident about modeling how the energy in a reaction will change, because this unit provided me with the information necessary to determine the type. With this knowledge, I can now interrelate with other properties and believe that this new ability will assist in future units as well. This unit has encouraged a deeper understanding of the world and its guiding principles.

(HOPE THIS HELPS <3)

A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.

ANSWER:

[H+] = [H3O+] = 2.52 * 10^-7M

pH = -log [H+]

pH = -log [2.51*10^-7]

pH = -[-6.60]

pH = 6.60

Hope this helps :)

Answer:

1. 1 mole of Cu to 2 moles of AgNO3

2. 1 mole of Cu to 2 moles of Ag

Explanation:

Cu + 2AgNO3 —-> Cu(NO3)2 + 2Ag

Cu = 1

Ag = 2

NO3 = 2

1. 1 mole of Cu to 2 moles of AgNO3

2. 1 mole of Cu to 2 moles of Ag

If a person with type A blood (AO) is crossed with a person with type B blood (BO), the correct genotype percentage is 25% AB, 25% BO 25%AO, and 25% OO while the phenotypes are 25% A, 25% B, 25% AB and 25% O.

A punnet square in genetics is a useful diagram to estimate the phenotypes in offspring, in this case we have

      A    O

B   AB  BO

O  AO  OO

Therefore, with this data, we can see that the punnet square can be used to estimate phenotypes and thus determine the proportion of offspring.

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The IUPAC name of the compound NaB(OH)4 is sodium tetrahydroxyborate.

The compound NaB(OH)4 is made up of sodium ions (Na+) and tetrahydroxyborate anions (B(OH)4-).

According to IUPAC naming conventions, the name of an ionic compound is written by listing the cation first, followed by the anion. In this case, the cation is sodium (Na+) and the anion is tetrahydroxyborate (B(OH)4-).

To name the tetrahydroxyborate anion, we start by identifying the boron atom, which has a valency of three. The hydroxide ions (OH-) are then added to balance the charge, resulting in the formula B(OH)4-.

The prefix "tetra-" indicates that there are four hydroxide groups attached to the boron atom. The suffix "-ate" is used to indicate that this is an anion.

Finally, the name of the compound is written as "sodium tetrahydroxyborate" because it contains one sodium cation and one tetrahydroxyborate anion.

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Explanation:

Using mole-mole relationship

If 6 moles of HNO3 will give 2 moles of H20

That means,

1 mole of HNO3 will give 1/3 moles of H20

Therefore,

29 mole of HNO3 will give [(1/3) x 29] moles

= 29/3 moles

= 9.67 moles

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Answer: Lebron

Explanation: James was here

The volume that the oxygen gas will occupy at 32.2mL and 30°C is 21.57mL.

The volume of a gas can be calculated using the combined gas law as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, a sample of oxygen gas occupies 32.2 mL at 30 °C and 452 torr.

452 × 32.2/303 = 452 × V/203

48.03 = 2.226V

V = 21.57mL

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Title of your comic strip: Adventures of Ice Cube.

So, the title will be "Adventure of Ice Cube".

Define the term title.

The term title refers to the name or heading given to a book, article, movie, piece of music, or other creative work that identifies it and distinguishes it from other works. It can also refer to a position or designation given to a person, such as a job title or academic title.

Box 1:

Introduction of character: Meet Ice Cube, a small, square-shaped piece of ice made of water molecules. Ice Cube was comfortably sitting in a glass of water until he was exposed to thermal energy.

Caption: This is Ice Cube. He is made of water molecules.

Box 2:

Source of thermal energy: A warm hand holding the glass of water.

Caption: Suddenly, a warm hand holds the glass of water.

Box 3:

Solid to liquid phase: Ice Cube starts to melt and becomes a liquid as it absorbs thermal energy from the warm hand.

Caption: Ice Cube starts to melt as he absorbs thermal energy from the warm hand.

Box 4:

Liquid to gas phase: Ice Cube continues to absorb thermal energy, and as a result, it transforms into water vapor and evaporates into the air.

Caption: As Ice Cube continues to absorb thermal energy, it transforms into water vapor and evaporates into the air.

Box 5:

Conclusion: Ice Cube's adventure comes to an end, but he realizes that he is never really gone, as his water molecules will always be a part of the water cycle.

Caption: The end. Ice Cube is gone, but his water molecules will always be a part of the water cycle.

Box 6:

Additional Information: Show the water cycle and explain how Ice Cube's water molecules can be a part of it.

Caption: Ice Cube's water molecules will eventually come together with other water molecules to form clouds and rain. Then, they will flow into rivers and oceans, and the cycle starts again.

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According to the observations, work of scientist uses evidence while work of an engineer uses a practical approach.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

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A pure substance is made up of only one type of particle as this is the reason for the denomination 'pure'.

The relative chemical composition of a pure substance is based on only one type of compound or element, which is thus the major determinant of a substance to be considered pure for a given solution.

Therefore, with this data, we can see that the relative chemical composition of a pure substance is based on the presence of one class of element.

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Answer:

A pure substance is made up of only one type of particle. These particles can be atoms, ions, or molecules, depending on the nature of the substance. In other words, a pure substance is homogeneous, meaning that it has the same composition and properties throughout its entire volume.

Answer:Super-giants

Explanation:

Based on the photo provided, it appears to be a picture of the Earth as seen from space. Unfortunately, I cannot determine the phase of the Moon from this image alone as the Moon is not visible in the photo.

What are the phases of the moon ?

The phases of the Moon are the different appearances of the illuminated portion of the Moon as seen from Earth. There are eight commonly recognized phases of the Moon, which are:

New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon

Waning Gibbous, Third Quarter, Waning Crescent

The entire cycle of lunar phases takes approximately 29.5 days to complete, which is known as a lunar month.

Based on the photo provided, it appears to be a picture of the Earth as seen from space. Unfortunately, I cannot determine the phase of the Moon from this image alone as the Moon is not visible in the photo.

The phase of the Moon changes continuously over a period of approximately 29.5 days, so it would be necessary to have a separate photo of the Moon to determine its phase at the time the astronaut took this picture.

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Answer:

670,385k

Explanation:

Answer: As a result, when you add oil to a cup of water the two don't mix with each other. Because oil is less dense than water, it will always float on top of water, creating a surface layer of oil.