The half-life of Sample A is 80 days. The original Sample A has 20 grams of radioactive material, how much radioactive material will be left in 80 days

Answer:

3 Pb(NO3)2 + Al2(SO4)3 = 2 Al(NO3)3 + 3 PbSO4

Explanation:

I think your equation is incorrect? This is balanced and the sum of coefficients is 9.

substance should be added to the untreated water, according to reactions 1 and 2, if researchers want to improve the effectiveness of the chromium(vi) elimination procedure

A crucial trace mineral called chromium can increase insulin sensitivity and improve protein, glucose, and lipid metabolism. It is a lustrous metal that people only require incredibly little amounts of.

Some reports have linked chromium to sporadic irregular heartbeats, sleep issues, migraines, mood swings, and allergic reactions. Damage to the kidneys or liver may be made more likely by chromium. Never use chromium without first consulting your doctor if you suffer from kidney or liver illness.

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there is nothing with which it can react

Explanation:

The limiting reactant(s) prevents a reaction from continuing because there is none left.

Identification of the limiting reactant makes it possible to calculate the theoretical yield of a reaction. The reason there is a limiting reactant is that elements and compounds react according to the mole ratio between them in a balanced chemical equation.

The reactant that is consumed first and limits the amount of product(s) that can be obtained is the limiting reactant. To identify the limiting reactant, calculate the number of moles of each reactant present and compare this ratio to the mole ratio of the reactants in the balanced chemical equation.

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Drugs that block MAO-B are dopaminergic agonists, whereas MAO-A blockers are noradrenergic and serotonergic agents.

Any molecule that, when consumed, alters the physiology or psychology of an organism qualifies as a drug.Usually, foods and other substances that help nutrition are segregated from drugs. Drugs can be ingested, inhaled, injected, smoked, absorbed via the skin using a patch, suppository, or dissolved under the tongue.

In pharmacology, a drug is a chemical compound, usually one with a well-known structure, that, when given to a living thing, has a biological impact.A pharmaceutical drug is a chemical compound that is used to treat, cure, prevent, or diagnose an illness, as well as to improve wellbeing. It is also known as a medication or medicine.

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The given element in the third row of the periodic table is Phosphorus P.

Ionization energy, ionization strength is the minimum strength required to take away the maximum loosely bound electron of an isolated gaseous atom, fantastic ion, or molecule.

Given,

The first ionization energy is 578 KJ/mol,

2nd ie is 1820 KJ/mol,

the 3rd ie is 2750 KJ/mol,

the 4th ie is 11600 KJ/mol,

and the 5th ie is 14842 KJ/mol.

From the given data it is clearly observed that there is a large energy difference between 3rd to 4th ionization energy. It means that it must have 3 valance electrons.

So, the element is phosphorus.

The ionization energy of atoms denoted Ei, is measured with the aid of locating the minimum power of light quanta (photons) or electrons expanded to recognized electricity so one can kick out the least certain atomic electrons. The dimension is finished in the gas segment on single atoms.

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Answer:

Hydrogen Chloride is 74.64 grams.

Explanation:

Using the given information, we can find the amount of grams of hydrogen chloride that take place in the reaction.

Due to the Law of Conservation of Mass, the mass of the system must remain constant. To find the value of x, make the equation below.

\(24.30 + x=2.04 + 96.90\)

The left side represent the reactant side of the chemical reaction and the right side represents the product side.

\(2.04 + 96.90= 98.94\)

\(24.30+x=98.94\)

\(24.30 - 24.30 + x= 98.94 - 24.30\)

\(x=74.64\)

Answer:

51

Explanation:

Range= the difference between highest number and lowest number in a data set. For this, range =62-11 = 51

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Answer:

The concentration of the drug in the bloodstream 125 minutes later would be approximately 0.2840 ug/ml.

Explanation:

What is first order kinetics?

First-order kinetics is a mathematical model used to describe the rate of a chemical reaction or a process in which the rate of change of a substance is directly proportional to its concentration. It is often used to describe the elimination or decay of drugs or other substances from the body.

The mathematical expression for first-order kinetics is represented as:

Rate = k × [A]

In which:

R= Rate is the rate of change of the substance (e.g., concentration decrease per unit time)

K = rate constant

[A] = concentration of the substance

According to the given question;

Initial concentration (C0) = 0.79 ug/ml

Half-life (t1/2) = 83 minutes

Time elapsed (t) = 125 minutes

To calculate the concentration after a certain time, we will use the formula:

C = C0 × (1/2)^(t/t1/2)

Substituting the given values:

C = 0.79 ug/ml × (1/2)^(125/83)

C ≈ 0.79 ug/ml × 0.5^(1.506)

C ≈ 0.79 ug/ml × 0.3604

C ≈ 0.2840 ug/ml

Therefore, the concentration of the drug in the bloodstream 125 minutes later would be approximately 0.2840 ug/ml.

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Answer:

Explanation:

A physical change can't reverse a chemical change. This is because a chemical change results in a new substance being formed. Chemical bonds are broken and and new bonds are formed between different atoms. Another chemical change would be needed to break the new bonds and reform the original bonds.

Answer:

False

Explanation:

from gas such as vaporization

Explanation:

6, -5, -1, 1/2 is wrong because the angular momentum quantum number cannot be negative.

Answer:

a.the air has less thermal energy so that the temperature increases

Answer:

A magnet attracting metal

Answer:

A velocity-time graph shows how velocity changes over time. The sprinter's velocity increases for the first 4 seconds of the race, it remains constant for the next 3 seconds, and it decreases during the last 3 seconds after she crosses the finish line.

1. The equation is not balanced. The balanced equation is \(4NH_3 + 5O_2 --- > 4NO +6 H_2O\)

2. The equation is balanced.

3. The equation is not balanced. The balanced version is \(2H_2O --- > 2H_2 + O_2\)

A balanced chemical equation usually has the same number of atoms of different elements in the reactants and the products, even though the forms of the atoms might have changed.

Consider the first equation: \(NH_3 + O_2 --- > NO + H_2O\)

The number of hydrogen atoms is not balanced. Thus, the equation that shows balanced atoms of different elements would be: \(4NH_3 + 5O_2 --- > 4NO +6 H_2O\)

Consider the second equation: \(N_2 + 3H_2 -- > 2NH_3\)

There are 2 atoms of nitrogen in the reactants and there are also 2 in the product. The number of hydrogen atoms is 6 in the reactants and 6 in the products. Thus, it is a balanced equation.

Consider the third equation: \(2H_2O --- > H_2 + O_2\)

There are 4 hydrogen atoms in the reactant and only 2 in the products. The balanced equation would be: \(2H_2O --- > 2H_2 + O_2\)

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Answer:

a snowflake

Explanation:

Snowflake Symmetry. All ice crystals (of ordinary 'Ice 1h' that is) have the same basic hexagonal symmetry. The fundamental building block is a unit cell containing four water molecules. Ice crystals can be thought of as made of untold stacks of these unit cells.

The mass percentage of carbon in the compound is approximately 56.8%.

To get the mass percentage of carbon in the compound, we need to determine the mass of carbon and then calculate what percentage of the total mass is carbon.

As We know that 16.9 mg of CO2 is produced from 8.10 mg of the compound, which means that all of the carbon in the original sample has been converted to CO2.

The molar mass of CO2 is 44.01 g/mol, which means that 1 mole of CO2 has a mass of 44.01 grams.

From this, we can calculate the number of moles of CO2 produced:

16.9 mg CO2 * (1 g / 1000 mg) * (1 mol CO2 / 44.01 g) = 0.000383 mol CO2

As each mole of CO2 contains one mole of carbon, we know that the number of moles of carbon in the original sample is also 0.000383. The molar mass of carbon is 12.01 g/mol, so we can calculate the mass of carbon in the original sample:

0.000383 mol C * 12.01 g/mol = 0.0046 g C

Now, we can calculate the mass percentage of carbon in the original sample:

(mass of carbon / total mass of sample) * 100% = (0.0046 g / 0.00810 g) * 100% = 56.8%

hence, the mass percentage of carbon in the compound is approximately 56.8%.

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Answer:

c ) 8

Explanation:

Given data:

Number of moles of water produced = ?

Moles of hydrogen react = 8 mol

Solution:

Chemical equation:

2H₂ + O₂     →     2H₂O

Now we will compare the moles of hydrogen and water.

         H₂          :         H₂O

          2          :            2

         8           :           8

Thus, 8 moles of water will produced.

In an ecosystem, based on the data in the graph the current carbon

dioxide levels are  far higher than the highest natural levels..

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system.

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Answer:

Charged objects have an imbalance of charge - either more negative electrons than positive protons or vice versa. And neutral objects have a balance of charge - equal numbers of protons and electrons. ... Their presence (or absence) will have no direct bearing upon whether an object is charged or uncharged.

Answer:

3. Triple Beam Balance

Explanation:

A triple beam will be most suitable for measuring the mass of a small stone because it is very accurate, and has a reading error of +/- 0.05 gram.

From the parameters that are given, the number of moles of ammonia is 1 mole.

We know that the number of moles tells us the amount of the substance that is present in the system. We have to know the concentration as well as the volume of the solution and these are the things that we can use to be able to determine the number of moles of the solution.

Here;

Concentration of the solution = 1.25 M

Volume of the solution = 800. mL

Number of moles = concentration * volume

= 1.25 M  * 800/1000 L

= 1 mole

The chemical formula of ammonia can be written as \(NH_{3}\). The formula for molarity is the ratio of the number of moles to the volume of the solution and it should be given to at least two significant figures.

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Answer:

Don't use this because your chemistry teacher knows you are cheating on your online quiz.

Explanation:

From said teacher

Answer:

40km/hr

Explanation:

Speed = Distance ÷ Time and since they both have different units we have to change one of them. Therefore if we change 30 minutes to half an hour we say 20km ÷ ¹/2

The loss of mass in a nuclear reaction is due to the conversion of some of the mass into energy, as described by Einstein's famous equation, E=mc^2. This equation states that energy (E) and mass (m) are interchangeable, and the conversion of mass into energy releases a tremendous amount of energy.

In a nuclear reaction, the nuclei of atoms are transformed into different nuclei, releasing or absorbing energy. This energy is in the form of gamma radiation, which carries away some of the mass of the system in the form of energy. The loss of mass, also known as mass defect, is the difference between the actual mass of an atomic nucleus and its expected mass based on the individual masses of its constituent protons and neutrons.

This mass defect is the result of the strong nuclear force that holds the nucleus together, and it is this energy that is released during a nuclear reaction. The energy released during a nuclear reaction can be harnessed to generate electricity in nuclear power plants, or to propel a rocket in a nuclear weapon.

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Assuming there are no other changes to the system, the change in internal energy is 0 joules.

This is because the internal energy of a system is a measure of the total amount of energy stored within the system. If there are no changes to the system, then the amount of energy stored in the system remains the same and thus the change in internal energy is 0 joules.

Is a unit of measurement used to determine the total amount of energy stored within a system. This amount of energy varies depending on the work done in the system, as well as the transferred between the system and its environment. When dealing with a closed system, i.e., a system that is not affected by any external change, the change in internal energy is zero.

This is because in a closed system, there is no work done and no heat transferred to the system. This means that the total amount of energy stored within the system does not change, so the change in internal energy is zero.

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Answer:

B. Large atoms tend to have a low ionization energy and a low electron affinity.

Explanation:

Atomic radii can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. The atomic radius of a chemical element decreases across the periodic table, typically from alkali metals (group one elements such as hydrogen, lithium and sodium) to noble gases (group eight elements such as argon, helium and neon). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

Generally, atoms with relatively large atomic radii tend to have a low ionization energy and a low electron affinity. Ionization energy can be defined as the minimum energy required to remove or detach an electron from a neutral atom in a gaseous state. Electron affinity can be defined as the ability of an atom of a chemical element to accept or accommodate an electron.

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 4500 g

density = 20.5 g/cm³

We have

\(volume = \frac{4500 }{20.5} \\ = 219.51219...\)

We have the final answer as

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