Arrange the following in order of increasing density: B, Li, Rb, F

After 30.0 days, only 14.6% (or 0.146) of the initial sample of 13153I remains.

This is because the half-life of 13153I is relatively short, so a large portion of the material decays within a short amount of time. For radioactive decay: N(t) = N0 * (1/2)^(t/T1/2), where N(t) is the amount of radioactive material at time t, N0 is the initial amount of radioactive material, and T1/2 is the half-life of the material.

In this case, the initial amount of 13153I is 100% (or 1.00), since we are looking for the percentage that remains. We also know that the half-life of 13153I is 8.04 days. Therefore, we can plug in these values and solve for N(30):  N(30) = 1.00 * (1/2)^(30/8.04) = 0.146

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Answer:

11) gravity

12) grams

13)

14) fast

15)space

Answer:

11)To move a mass you need a force.

Force = mass x acceleration

12) An object at rest stays at rest and an object in motion stays in motion unless acted on by an outside force.

13)For every action there is an equal and opposite reaction.

14) fast

15)False

Explanation:

The amount of solid left after fully evaporating 1 kg (1000 g) of seawater depends on the salinity of the seawater. Seawater typically contains about 3.5% (35 grams per liter) dissolved salts, including various ions such as sodium, chloride, magnesium, and calcium.

Assuming that the seawater has a salinity of 3.5%, we can calculate the amount of solid left after evaporation as follows: 1000 g of seawater contains 35 g of dissolved salts (3.5% of 1000 g). When the seawater is fully evaporated, the dissolved salts will remain as solid residue.

Therefore, after fully evaporating 1 kg of seawater, you will be left with approximately 35 g of solid residue.

It's worth noting that the actual amount of solid residue left after evaporation may vary depending on factors such as the temperature and pressure at which the evaporation takes place and the specific composition of the seawater. However, the calculation above provides a rough estimate based on the typical salinity of seawater.

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20%

The codeine percentage strength of the solution is 20%

Mass of solute times strength of solution(g) Amount of the solution(L)

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Answer: The specific heat of the Al is \(1.008J/g^0C\).

Explanation:

\(Q_{absorbed}=Q_{released}\)

As we know that,  

\(Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})\)

\(m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)]\)      

where,

\(m_1\) = mass of water = 87.4 g

\(m_2\) = mass of Al metal = 6.7797 g

\(T_{final}\) = final temperature = \(28.67^0C\)

\(T_1\) = temperature of water = \(25.37^oC\)

\(T_2\) = temperature of Al metal = \(205.24^oC\)

\(c_1\) = specific heat of water = \(4.184J/g^0C\)

\(c_2\) = specific heat of Al metal = ?

Now put all the given values in equation (1), we get

\(m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]\)

\(87.4\times 4.184\times (28.67-25.37)^0C=-[6.7797\times c_2\times (28.67-205.24)]\)

\(c_2=1.008J/g^0C\)

Therefore, the specific heat of the Al is \(1.008J/g^0C\).

Despite having a scientific foundation, the bertillon method was recognised to have some shortcomings. For example, because it was primarily fingerprints created for men who had attained full physical maturity and had short hair.

It might not have been able to accurately apply to youngsters or women. The Bertillon System was used as the international standard for criminal identification until the 16th century, when the use of fingerprints to confirm identity took off. The Bertillon method was a huge success when it was used by Bertillon and a small group of close friends in its original form; but, when the system was implemented globally, the outcomes were much less encouraging.

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A combination of simple distillation and acid-base extraction is an effective method for purifying fluorene from ethyl 4-aminobenzoate.

The extraction method that effectively purified fluorene from ethyl 4-aminobenzoate is a combination of simple distillation and acid-base extraction.The purification of fluorene from ethyl 4-aminobenzoate by using a combination of simple distillation and acid-base extraction is an effective method. Simple distillation is an effective technique for separating and purifying organic compounds that have different boiling points, while acid-base extraction is used to extract a specific component from a mixture.The extraction process usually involves adding a suitable solvent, such as ether, to the mixture, followed by shaking. The solvent is then separated from the mixture, and the component of interest is extracted into the solvent.The mixture obtained from the simple distillation was then treated with NaOH solution to convert ethyl 4-aminobenzoate to its ionic form (anion), which was then separated using a separatory funnel. The fluorene was then obtained by evaporating the solvent after acidifying the separated portion with hydrochloric acid, which was extracted using a separatory funnel.

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silver density is 10.5 gm/cm3

Answer:

C) 219 cm^3

Explanation:

What volume of silver metal

will weigh exactly 2,300.0 g

if the density of silver is

10.5 g/cm3?

A) 2.42x10^4 cm^3

B)4.47x10^-3 cm^3

C) 219 cm^3

density D = M/V

so D X V=M

so V=M/D

mass is 2,300.0 gm

density is 10.5 gm/cm3

so V=2,300.0/10.5 =219cm3

so the answer is c

C) 219 cm^3

will weigh exactly 2,300.0 g

if the density of silver is

10.5 g/cm3?

A) 2.42x10^4 cm^3

B)4.47x10^-3 cm^3

C) 219 cm^3

density D=M/V

so M= DXV

so 2.3

Answer:

D Sunlight

Explanation:

Hoped that helped :)

Answer:

The patient requires a dose of 107.2 mg of gentamicin

Explanation:

A dosage of 1.75 mg per Kilogram body weight results in blood serum levels of 4.5 mcg/mL

This means that; 1.75 mg/ kg = 4.0 mcg/mL

Therefore, dosage of gentamicin in  mg/kg that will result in 4.5 mcg/mL blood serum level = (1.75 mg/Kg * 4.5 mcg/mL) / 4.0 mcg/mL

Dosageof gentamicin = 1.97 mg/Kg

1-lb = 0.453592 Kg

Weight of 120-lb patient in Kg = 120 * 0.453592 = 54.43 Kg

Dose in mg required by patient = 1.97 mg/Kg * 54.43 Kg = 107.2 mg

Therefore, the 120-lb patient requires a dose of 107.2 mg of gentamicin to result in a blood serum level of 4.5 mcg/mL

Answer:

A= Coconut oil, B= Water, C= Sea water

Explanation:

oil is dense, water will allow things to float, but not as well as sea water

Answer:

A

Explanation:

Answer:

The particals in a physical change alwayd stay the same, but for a chemical change that is the only time they will change. Not during a physical change

Explanation:

The excess soil that travels downstream will destroy the fish habitat thereby reducing the biodiversity.

Biodiversity can be defined as different forms of life found on earth.

The biodiversity of an ecosystem is very important because it shows the importance of different organisms, no matter how small, and the roles they play in the ecosystem.

The washing away of the soil into the stream will disrupt the aquatic ecosystem.

This can lead to increased pollution and sedimentation in the streams.

If the effects are not controlled, it would lead to depletion of fish species.

Therefore, the excess soil that travels downstream will destroy the fish habitat thereby reducing the biodiversity.

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Answer:

Um what

Explanation:

There is no danger

From the collected three samples from the coral reef we can conclude that:

SAMPLE A - pure substance.

SAMPLE B - homogeneous mixture.

SAMPLE C - heterogeneous mixture.

Pure substances and mixtures are the two broad categories into which matter can be divided.

A sort of matter known as a pure substance has qualities that are constant throughout the sample and a stable composition that makes it the same everywhere (meaning that there is only one set of properties such as melting point, color, boiling point, etc. throughout the matter).

A mixture is said to be homogenous if its composition is constant throughout. Because the dissolved salt is evenly distributed throughout the whole salt water sample, the salt water described above is homogenous.

A combination is said to be heterogeneous if its composition is not constant throughout. Vegetable soup is a complex concoction. Each mouthful of soup will have differing percentages of the various veggies and other ingredients.

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Taking into account the Newton's second law, the correct answer is option A. F = 9.68 N right

In first place, acceleration in a body occurs when a force acts on a body.

Newton's second law states that a force will change the speed of an object because the speed and/or direction will change. These changes in velocity are called acceleration.

So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object

Mathematically, Newton's second law is expressed as:

F= m×a

where:

In this case, you know:

Replacing in Newton's second law:

F= 2.2 kg× 4.4 m/s²

Solving:

F= 9.68 N

Finally, As the bowl of fruit accelerates to the right, the correct answer is option A. F = 9.68 N right

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Answer:

The Answer is a liquid.

Answer:

4th one

Explanation:

a physical change is something u can see, so if the substance changes its properties then thats a physical change.

Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

This reaction, H2O(l) => H+(aq) + 2OH-(aq), best exemplifies the autoionization or self-ionization of water. The process by which an atom or molecule receives or loses an ion is known as ionization.

A positive or negative charge that results from chemistry. An atom or molecule that has an electrical charge is called an ionization. An anion is the name given to an ion that has a negative charge, and a cation is the name given to an ion that has a positive charge. An ion or group of ions with a positive charge and the innate propensity to travel toward the negative electrode during electrolysis are called cations. Metals are dissolved into their corresponding ions during a corrosion reaction.

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Answer:

.0139

Explanation:

The number of moles of HCl would take to neutralize the sodium hydroxide produced is equal to 0.0139 moles.

A neutralization reaction can be defined as a chemical reaction in which an acid and base react with each other to prepare salt and water.

When HCl reacts with NaOH and the resulting salt is sodium chloride and water.

HCl    +  NaOH   \(\longrightarrow\)   NaCl   +   H₂O

The chemical reaction, chemical reaction of sodium metal and water gives hydrogen gas and sodium hydroxide:

\(2Na+ 2H_2O \longrightarrow 2NaOH + H_2\)

Given the amount of sodium metal = 0.32 g

The moles of sodium metal = 0.32/23 = 0.0139 moles

If the 2 moles of sodium produce sodium hydroxide = 2 mol

The 0.0139 moles of sodium will produce NaOH = 0.0139

Therefore, 0.0139 moles of HCl is required to neutralize 0.0139 moles of NaOH.

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Answer:

the answer would be D, snC03

Answer:

M₂  = 0.16 M

Explanation:

Given data:

Initial volume of solution = 20 mL

Initial concentration = 1.0 M

Final volume = 120 mL

Final/new concentration = ?

Solution:

Formula:

M₁V₁     =    M₂V₂

by putting values,

1.0 M × 20 mL = M₂ × 120 mL

M₂  = 1.0 M × 20 mL / 120 mL

M₂  = 20 M.mL /120 mL

M₂  = 0.16 M

pop by nayeon is the answer fs

Answer:

Chemical properties because if it was physical property then it will glow in dark

Answer:

Yes, energy can be released when matter changes. In physical changes, such as phase changes, energy is released when changing from a higher energy state to a lower energy state. An example of this is when gaseous water condenses into the liquid phase.

Yes, energy is always either released or absorbed during a chemical reaction. This is because all chemical reactions involve energy. In any chemical reaction, energy is required to break the bonds in reactions, and energy is released when new bonds form after the reaction.

And no energy cannot change in matter or take place in which energy is neither releasedreased nor absorbed.

Explanation:

The ion typically formed by fluorine is the fluoride ion (F-).

Fluorine, as an element, has a strong tendency to gain one electron to achieve a stable electron configuration, following the octet rule. By gaining an electron, fluorine achieves a full valence shell with eight electrons, resembling the electron configuration of a noble gas. As a result, fluorine forms the fluoride ion (F-) by gaining one electron. The fluoride ion carries a charge of -1 due to the additional electron, balancing the charge of the fluorine atom. This ion is highly stable and plays important roles in various chemical and biological processes.

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The two ions present in the solution are:

1. Sodium ion, Na⁺

2. Hydroxide ion, OH¯

The correct answer to the question is the 3rd option. The sodium ion is positive, and the hydroxide ion is negative.

Ions are atoms or group of atoms which possess an electric charge.

Aqueous Sodium hydroxide, NaOH contains sodium ion and hydroxide ion.

The sodium ion is positive while the hydroxide ion is negative as illustrated below:

NaOH(aq) —> Na⁺(aq) + OH¯(aq)

From the illustration above, we can conclude that the correct answer to the question is the 3rd option. The sodium ion is positive, and the hydroxide ion is negative.

Please see attached photo for further details

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A reaction mechanism for the destruction of ozone, O₃(g), in the overall reaction, NO(g) is best described as the catalyst.

The reaction for the destruction of the ozone  is given as follows:

NO  +   O₃    ---->   NO₂   +  O₂       SLOW STEP

NO₂   +  O     ---->  NO   +   O₂        FAST STEP

the overall reaction is expressed as follows :

O₃   +   O   ----->  2O₂

In the process of the destruction of ozone , the NO acts as a catalyst. A catalyst are the substance which used to reduce the activation energy of the chemical reaction. catalysis increase the rate of the chemical reaction.

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