what is the kentic energy of a 2 kg ball as it falls half way from a 40 meter tall building

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:

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: 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: 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 clouds

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

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

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

Answer:

GAS

Explanation:

The movement of the particles is fast in increasing order of Solid< Liquid< Gas. The particles move faster in fluids which are liquids and gases. The movement of the particles of a substance depends on many factors like temperature, pressure, viscosity of the fluid, density, surface or environment in/on which its flowing.

The rise in temperature of the substance increases the kinetic energy of its particles which makes them to move faster. The increase in temperature of the solids up to a certain point melts them which allows them to flow, causing the particles to move faster than before, also on increasing the temperature of the liquids converts them to gas which makes their particles to move more rapidly and freely.

Particles move the fastest in substances with the least viscosity, meaning they have lower resistance to flow. Gaseous substances, which have weaker intermolecular forces, allow particles to move rapidly, thus, in gas particles move the fastest compared to liquids and solids.

The question asks about the movement speed of particles in different substances. In general, particles move the fastest in substances with the least resistance to flow, which indicates that these substances have the least viscosity. Conversely, particles move slowly in substances with higher resistance to flow, meaning they are more viscous. As particles move faster, there is less curvature in their trajectory. For instance, particles that move at speeds close to the speed of light, such as beta particles emitted by radioactive substances, will exhibit almost straight trajectories.

Substances with stronger intermolecular forces tend to be more viscous and have slower-moving particles, while substances with weaker intermolecular forces have faster-moving particles and lower viscosity.

Within the states of matter, solid particles are mostly rigid with only vibrations, liquid particles are more mobile, and gas particles are the most mobile, moving at high speeds and frequently colliding with each other. Therefore, in the context of states of matter, gas particles move the fastest.

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:

carbon dioxide

Explanation:

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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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 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:

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:

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:

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

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

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: 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

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: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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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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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:

                     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:

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:

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:

Moles of TNT = 2.38 moles

Explanation:

First , calculate the molar mass of the compound TNT

The formula is : C7H5N3O6

How to calculate molar mass?

Molar mass : It is the mass of substance in grams which is present in 1 mole of the compound.It is calculated by:

Molar mass = Number of atoms x the atomic mass of the element

Atomic mass of the elements are given below :

C = 12.0107

H = 1.0079

N = 14.0067

O = 15.9994

Molar mass of C7H5N3O6 =

= (7 x C) + (5 x H) + (3 x N) + (6 x O)

= 7(12.0107) +5(1.0079) + 3(14.0067) + 6(15.9994)

Molar mass = 227 .13 gram/mole

Mole are calculated using the formula:

[tex]Moles =\frac{given\ mass}{Molar\ mass}[/tex]

Given mass = 539.88 grams

Molar mass = 227.13 g/mole

[tex]Moles =\frac{539.88}{227.13}[/tex]

= 2.3769

Moles = 2.38 moles

The number of moles of TNT in 539.88 g is 2.38. This is found by dividing the mass of TNT by its molar mass.

To solve this problem, we need to first calculate the molar mass of TNT (C7H5N3O6). The molar masses of Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O) are roughly 12.01 g/mol, 1.01 g/mol, 14.01 g/mol, and 16.00 g/mol respectively. Thus, the molar mass of TNT is:

(7*12.01 g/mol) + (5*1.01 g/mol) + (3*14.01 g/mol) + (6*16.00 g/mol) = 227.13 g/mol

Then, use the formula to calculate the moles:

moles of TNT = mass(g) / molar mass(g/mol)

Substitute the values:

moles of TNT = 539.88g / 227.13 g/mol = 2.38 mol

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Answer:Sodium chloride solid is not a mixture. ... It cannot be physically separated into its components, Na+ and Cl−

Explanation:Sodium chloride is formed when sodium atoms interact with chlorine atoms. When this occurs, sodium will donate an electron (which is a negatively-charged particle) to chlorine. This makes sodium slightly positive and chlorine slightly negative.

Opposite charges attract, right? So then, sodium ions will attract chloride ions and form an ionic bond. By the way, chloride is the term used to designate the anion form of chlorine. The result is a crystallized salt that has properties that are different from the two parent elements (sodium and chlorine). The chemical formula for sodium chloride is NaCl, which means that for every sodium atom present, there is exactly one chloride atom.

Sodium chloride is a compound rather than a mixture because it consists of sodium and chlorine bonded together in a fixed ratio, forming a substance with unique properties different from those of the individual elements.

Sodium chloride (NaCl) is not a mixture but a compound because it is formed by a chemical reaction between the metal sodium and the nonmetal chlorine. In compounds, the components combine in a fixed ratio, exhibiting properties entirely different from the individual elements.

The formation of ionic compounds like sodium chloride involves the transfer of electrons from the metal to the nonmetal, resulting in a compound with a crystal lattice structure,  Sodium chloride is composed of sodium cations and chloride anions, and the strong ionic bonds in its structure require significant energy to break, which is not the case with mixtures.

Mixtures, unlike compounds, can vary in composition and the components maintain their own properties. In mixtures, substances like elements or compounds are just physically intermingled without chemical bonding, such as salt dissolved in water.

In contrast, every sample of sodium chloride has a uniform and definite composition and all are chemically identical, as sodium and chlorine react in a 1:1 ratio to form this vital ingredient of all animal diets.