the half-life of radioactive chemical 'x' is 10 minutes. if you initially had 200 grams of the substance, how many grams of the substance would you have after 30 minutes?

Answer:

The Temperature will Increase, and the fire will Blow

Explanation:

I hope I could help

Answer:

Lu

Hf

Ta

Explanation:

Lu- Lutecium
Atomic Number- 71
Atomic Mass-174.967

Hf- Hafnium
Atomic Number-72
Atomic Mass178.492

Ta- Tantalum
Atomic Number-73
Atomic Mass-180.948

The chemical elements that meet the criteria are Hafnium (Hf) and Tantalum (Ta).

The atomic number represents the number of protons in the nucleus of an atom, while the atomic mass represents the total mass of protons and neutrons in the nucleus of an atom.

Elements with atomic numbers greater than 70 are located in the bottom rows of the periodic table, known as the "lanthanides" and "actinides."

So, Atomic Number > 70 and Atomic Mass < 181.2 u

1. Hafnium (Hf) - Atomic Number: 72, Atomic Mass: 178.49 u

2. Tantalum (Ta) - Atomic Number: 73, Atomic Mass: 180.95 u

3. Tungsten (W) - Atomic Number: 74, Atomic Mass: 183.84 u

4. Rhenium (Re) - Atomic Number: 75, Atomic Mass: 186.21 u

Therefore, the chemical elements are Hafnium (Hf) and Tantalum (Ta).

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2gcm³ is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL.

The term density is define as the ratio of mass and volume. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimeter.

Density = mass / volume

Given:

Density = ?

Mass = 1.5 gram

Volume = 0.75 ml

By substituting this values in give equation we get,

Density = 1.5 / 0.75

= 2 gcm³

Thus, 2 gcm³ is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL.

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Answer:

36.8%

Explanation:

Ferrous sulfate has the composition 36.8% Fe, 21.1% S and 42.1% O.

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Lead (II) acetate and sodium iodide do interact. In an oral solution in water, each of these salts mix to produce acid solution plus lead (II) iodide.

Baking soda, often known as sodium bicarbonate, is a food additive. It is also applied as both an organic deodorant to get rid of chemicals that make things smell bad in carpets and refrigerators. Calcium chloride, also known as "road salt," is a salt-like substance used to de-ice sidewalks and roads.

The analysis concluded there's no cause for worry regarding carcinogenicity. This information leads to the conclusion that the drug is not dangerous and that a calcium chloride carcinogenicity research was not performed.

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Pb's crystal structure is more accommodating to solute atoms, allowing it to accommodate more Sn atoms. Sn atoms tend to cluster together and form distinct regions in a Pb-Sn alloy.

The ability of a solid solution to accommodate atoms of another element depends on the atomic size, crystal structure, and electronic configuration of both the solvent (major component) and the solute (minor component) atoms.

In the case of lead (Pb) and tin (Sn), they are both metallic elements with similar crystal structures and atomic radii. However, Pb has a more complex crystal structure than Sn, which allows for more spaces (interstices) for solute atoms to occupy. Additionally, Sn atoms have a greater atomic mass than Pb atoms, which means they have a stronger tendency to cluster together and form distinct regions within the microstructure.

Therefore, a sample of Pb can accommodate more Sn atoms in its microstructure compared to how many atoms of Pb a sample of Sn of the same size can accommodate because the crystal structure of Pb is more accommodating to solute atoms and the Sn atoms are more likely to cluster together and form distinct regions within the microstructure of a Pb-Sn alloy.

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Due to the hydrogen bonding between the molecules of ethanol and water, it is True.

Water and ethanol form weak hydrogen bonds with aromatic hydrogen atoms and strong hydrogen bonds with the hydroxyl, carbonyl, and ether groups in chrysin/galangin. Although less frequently than in water, ethanol molecules can form hydrogen bonds with one another. The fact that there is only one hydrogen with a significant Positive charge in each ethanol molecule limits the hydrogen bonding. Between adjoining hydrogen and oxygen atoms of nearby water molecules, hydrogen bonds are formed. A bond called a hydrogen bond is produced by the attraction between individual water molecules.

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Answer:

Prokaryotic cells contain DNA, contain ribosomes, and lack a nucleus.

Answer:

Contains DNA

Contains Ribosomes

lacks a nucleus

Explanation: I took the quiz on edge

The Lewis structure for the iodate ion (IO3-) consists of a central iodine atom bonded to three oxygen atoms. There are no possible resonance structures for the iodate ion.

In the Lewis structure of the iodate ion, the iodine atom (I) is located at the center and is surrounded by three oxygen atoms (O). The iodine atom forms single bonds with each oxygen atom, and each oxygen atom has a lone pair of electrons. The structure can be represented as follows:

O - I - O

Each oxygen atom has a formal charge of -1, while the iodine atom has a formal charge of +1 to maintain the overall charge of the ion at -1.

In the case of the iodate ion, there are no possible resonance structures because the iodine atom cannot form multiple bonds or distribute its electrons in different ways. Therefore, the Lewis structure provided represents the most accurate representation of the iodate ion.

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Answer:

A mole in chemistry is defined as the number or quantity of a chemical substance that consists of as many fundamental entities such as atoms, molecules, and ions. Therefore, the statement that best describes a mole is that, it is used for directly comparing the amounts of substances.

Explanation:

I found this hope it helps!! (read and try your best)

Th statement which describes a way in which moles is useful is that it can be used to keep track of chemical amounts.

Mole is unit to calculate the amount of chemical substances and it is represented as:
n = W/M, where

W = given mass

M = molar mass

It can be useful in chemical reactions to calculate the relative amount of species present before and after the reaction. In one mole of substance 6.022 × 10²³ atoms of that substance is present.

Hence, option (A) is correct.

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Answer:

1.8 * 10^24 atoms

Explanation:

n = M(B) / m = 10.8 / 3.60 = 3 mol

N = n * Na = 3 * 6*10^23 = 1.8 * 10^24 atoms

Answer:

Difusión

Explanation:

La difusión es el movimiento de las partículas de una sustancia desde una región de mayor concentración a una región de menor concentración.

La difusión es una evidencia de que la materia está compuesta de partículas.

Si abro un perfume en un extremo de una habitación, la fragancia se percibe en el otro extremo de la habitación después de unos segundos debido a la difusión

A 0.9% normal saline solution is often administered with intravenous medication because it is compatible with the bloodstream.

The reason why a 0.9% normal saline solution is used is because it closely resembles the electrolyte balance of our body fluids. This makes it compatible with the bloodstream and helps prevent any adverse reactions when the medication is introduced into the body through the intravenous route.

By using a solution that is similar to the body's fluids, it ensures that the medication can be effectively and safely delivered into the bloodstream. This allows for the medication to be quickly distributed throughout the body and reach its target site of action. Additionally, the normal saline solution also helps to maintain the hydration and electrolyte balance of the patient, which is crucial for their overall well-being during the administration of intravenous medication.

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The kinetic energy is 3e7 eV

The structure of alpha particles, also known as alpha rays or alpha radiation, is similar to that of the helium-4 nucleus and is made up of two protons and two neutrons bonded together. They can also be created in various ways, although typically they are created during the alpha decay process.

The Greek letter "alpha" serves as the inspiration for the naming of these particles. The alpha particle is represented by the symbols or 2+. They are also sometimes written as He2+ or 4 2He2+, denoting a helium ion with a +2 charge, because they are similar to helium nuclei (missing its two electrons). The alpha particle transforms into a typical (electrically neutral) helium atom 4 2He after the ion absorbs electrons from its surroundings.

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Based on the rate constant of the reaction, the reaction rate, r 4.8 * 10⁻⁷ mol/L.s

The rate of a reaction is the number of moles of reactant molecules converted or the number of moles of product molecules formed per unit time.

It is the rate at which product molecules are formed or reactant molecules disappear.

The rate equation of a chemical reaction is an expression that describes the relationship between the rate of the chemical reaction and the concentration of the reactants in the chemical reaction.

The rate equation includes a rate constant which is a constant that is unique for a given reaction. The rate constant numerically describes the rate and direction of a chemical reaction.

Considering the given rate equation:

reaction rate = k [NH4 + (aq) ] [NO2(aq) ]

the data provided is as follows;

k =  3.20 x 10⁴ L/(mol⋅s)

[NH4+ ] = 0.100 mol/L and,

[NO2] = 0.0150 mol/L

The reaction rate, r will be:

r = 3.20 x 10⁻⁴ L/(mol⋅s) * 0.100 mol/L *  0.0150 mol/L

r = 4.8 * 10⁻⁷ mol/L.s

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

An example of where dry deposition would be higher than wet deposition is Mediterranean regions like Greece, Malta, Cyprus.

An example of where wet deposition would be higher than dry deposition are rainforest areas.

Dry deposition is described as the free fall to Earth directly from the atmosphere of atmospheric trace gases and particulate matter.

Wet deposition is the process whereby atmospheric gases mix with suspended water in the atmosphere and are then washed out through rain, snow or fog.

Wet deposition includes rain, sleet, snow, or fog that has become more acidic than normal while dry deposition is known as another form of acid deposition, and this is when gases and dust particles become acidic.

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Answer: The boys nervous system played a role by stimulating mechanism for regulation of food intake.

Explanation:

The nervous system is the system that detects and responds to changes both inside and outside the body. This system consists of the following parts:

--> The Central Nervous System: This is composed of the BRAIN and the SPINAL CORD.

--> The Peripheral Nervous System: This is the rest of the nervous tissues that is found through the body that is outside the brain and the spinal cord. It consists of the SENSORY SYSTEM and the MOTOR SYSTEMS.

The centers that regulate food intake is the hypothalamus which is located immediately above the pituitary gland of the human brain. The sensation of hunger is associated with a craving for food, rhythmical contraction of the stomach and restlessness which cause the person to search for food. This is because the lateral nuclei of the hypothalamus which serves as the feeding center has been stimulated.

After the boy has eaten a piece of burger, the ventromedial nuclei of the hypothalamus receives neural signals from the gastrointestinal tract that provides sensory information about stomach filling and chemical signals from nutrients in the blood that signify satiety (fullness).

If the handle of a faucet is 10 cm long then diameter of the shaft of the faucet is 20mm

Faucet handle is the control for water supply and it is the device to delivering water from plumbing system called as faucet handle

And here given data is

handle of a faucet = 10 cm long

We have to find diameter of the shaft of the faucet =?

Diameter = distance × 2

Diameter = 10 × 2

Diameter = 20mm

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Explanation:

C- Na Al wouldnt make sense so it would be either mg or Na but Na has only one electron

Nihonium (Nh) mass is 285.7 u, a synthetic element with atomic number 113, was the first synthesized chemical elements that do not exist in nature but can be created in laboratory.

Particle accelerators produce synthetic elements. Two tiny elements are propelled at breakneck velocities and crash with one another. Their nuclei combine to form one bigger element. Before it degrades, the element is examined using lab equipment.

Mass of Nb from the figure:

 => 10% x 284.2 + 30% 285.2 + 60% x 286.2

=> 285.7 u (atomic mass unit)

Transuranium elements and the actinoid series are typically found in period 7, along with occasionally created artificially. These elements can be utilised for detectors and spectrophotometers in addition to being the typical fuel for chemical reactors. Some are applied in the pharmaceutical sector.

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Chemical elements known as synthetic that do not exist in nature but = was elements_ Nihonium can be created in the laboratory are the first synthesized in 2004. (Nh), synthetic element with atomic number 113, hypothetical mass spectrum for sample of Nh containing 10 atoms shown in the picture. Using this spectrum information, calculate the mass of Nh in this sample

Answer:

285.7 u.

Explanation:

1 / 4

The equation for average atomic mass is

average atomic mass

=

∑

�

=

1

�

(

relative abundance

×

atomic mass

)

�

average atomic mass=

i=1

∑

n

​

(relative abundance×atomic mass)

i

​

start text, a, v, e, r, a, g, e, space, a, t, o, m, i, c, space, m, a, s, s, end text, equals, sum, start subscript, i, equals, 1, end subscript, start superscript, n, end superscript, left parenthesis, start text, r, e, l, a, t, i, v, e, space, a, b, u, n, d, a, n, c, e, end text, times, start text, a, t, o, m, i, c, space, m, a, s, s, end text, right parenthesis, start subscript, i, end subscript

We can use this equation, along with the relative abundances and atomic masses of each isotope in the mass spectrum, to calculate the average atomic mass of

N

h

Nh in the sample.

Hint #22 / 4

The mass spectrum shows three peaks, each corresponding to a different isotope of

N

h

Nh. We can determine the relative abundance of each isotope by dividing the number of atoms of that isotope present in the sample by the total number of atoms in the sample:

Isotope

N

h

-

284

Nh-284

N

h

-

285

Nh-285

N

h

-

286

Nh-286

Atomic mass (

u

u)

284.2

284.2284, point, 2

285.2

285.2285, point, 2

286.2

286.2286, point, 2

Relative abundance

1

a

t

o

m

10

a

t

o

m

s

=

.

1

10 atoms

1 atom

​

=.1

3

a

t

o

m

s

10

a

t

o

m

s

=

.

3

10 atoms

3 atoms

​

=.3

6

a

t

o

m

s

10

a

t

o

m

s

=

.

6

10 atoms

6 atoms

​

=.6

Hint #33 / 4

Plugging the relative abundances and atomic masses into the equation for average atomic mass, we get:

average atomic mass

=

∑

�

=

1

�

(

relative abundance

×

atomic mass

)

�

=

(

.

1

×

284.2

u

)

+

(

.

3

×

285.2

u

)

+

(

.

6

×

286.2

u

)

=

28.42

u

+

85.56

u

+

171.7

u

=

285.7

u

average atomic mass

​

=

i=1

∑

n

​

(relative abundance×atomic mass)

i

​

=(.1×284.2 u)+(.3×285.2 u)+(.6×286.2 u)

=28.42 u+85.56 u+171.7 u

=285.7 u

​

Hint #44 / 4

So, based on the mass spectrum, the average atomic mass of

N

h

Nh in the sample is

285.7

u

285.7 u.

The degrees of the vibrational freedom does Al₂Cl₆ is 18.

For the vibrational degrees of freedom of the molecule is as :

f = 3N - 6 - L

Where

f  = the number of vibrational degrees of the freedom,

N = the total number of the atoms in the molecule,

L = the number of the constraints or the restrictions

For the aluminum chloride,

N = 2 ( the two aluminum atoms) + 6 ( the six chlorine atoms) = 8.

The molecule has the  D3h symmetry, which will imposes some of the constraints in the vibrational motion of the molecule.

f = 3N - 6 - L

f = 3(8) - 6 - 5

f  = 18

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When a student accidentally adds 2.0g of Mg metal instead of Zn to react with 5.0g of \(CuSO_4\), the copper (II) sulfate solution would react with the Mg, because Cu is less active than Mg. However, not all the copper (II) sulfate reacted to form Cu. Therefore, option C is the correct answer

\(CuSO_4 + Mg \rightarrow Cu + MgSO_4\)

Copper (II) sulfate reacts with magnesium to form copper and magnesium sulfate, and the reaction is exothermic. As a result, the temperature of the solution increases.

When magnesium is added to a copper (II) sulfate solution, the magnesium displaces copper from copper (II) sulfate, forming magnesium sulfate and copper.

The addition of magnesium instead of zinc means that the copper (II) sulfate solution would react with magnesium rather than zinc. Magnesium has a lower reactivity than zinc, which means that it will displace copper from copper (II) sulfate instead of zinc.

However, not all the copper (II) sulfate will be reacted to form copper, since only a portion of the copper (II) sulfate is consumed by the reaction with magnesium.

Therefore correct option is c " the copper (II) sulfate solution would react with the Mg, because Cu is less active than Mg. However, not all the copper (II) sulfate was reacted to form Cu."

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If we add 25.6 g of an unknown molecular compound to the 0.250 kg of benzene, the molar mass of the unknown compound is 148.8 g/mol.

The Molality of the compound is given as :

ΔT = i Kf m

Where,

ΔT = freezing point depression = 3.54 °C

i =  Van't Hoff factor of the Benzene = 1

Kf =  constant of the freezing = 5.12 °C/m

m = molality = ?

m = ΔT / i Kf

m = 3.54 / 1 × 5.12

m = 0.69 mol

molality = moles / mass of benzene

moles = 0.172

The molar mass = mass / moles

The molar mass = 25.6 / 0.172

The molar mass = 148.8 g/mol

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At 37°C, the osmotic pressure of a 5.5% (mass/vol) aqueous solution of glucose (C6H12O6) is approximately 11.3 atm.

Osmosis is an important process in living organisms as it allows water and nutrients to move across the membrane and into cells. Osmosis also helps regulate the pH balance in cells and helps maintain the cell’s hydration. Osmosis is also an important process in industry as it is used in reverse osmosis to purify and desalinate water.

Assuming a density of 1 g/mL for the solution, we can calculate the molarity (M) as follows:

5.5 g of glucose / 100 mL of solution = 0.055 g/mL

0.055 g/mL / 180.16 g/mol (molar mass of glucose) = 0.000305 mol/mL

37 °C + 273.15 = 310.15 K

Now we can plug in the values into the equation to calculate the osmotic pressure \((\pi):\pi\) = (0.000305 mol/mL) × (0.0821 Latm/molK) × (310.15 K)

Simplifying the equation, we find:

\(\pi \approx 8.11 atm\)

Therefore, the osmotic pressure of the 5.5% glucose solution at 37 °C is approximately 8.11 atm.

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Science could be used either for good or for bad depending on the user. This can be observed from the life of Fritz Haber described below.

Fritz Haber was a German chemist who made significant contributions to the fields of chemistry and agriculture, and he is known for developing the process of synthesizing ammonia, which is used in fertilizer production. However, he is also known for his involvement in the development and use of chemical weapons during World War I.

Overall, it is difficult to make a definitive statement about whether the world is better off with or without Fritz Haber. His contributions to science and agriculture have been important, but the development and use of chemical weapons are atrocities that cannot be ignored. It is important to acknowledge and learn from both aspects of his legacy.

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The right response is C. because gas particles are closer together than solid or liquid particles. Because gas particles are constantly moving, there is less room between them than there is in solids or liquids.

In other words, when a gas is compressed, its particles become smaller and closer together, decreasing the distance between them and raising the pressure. This is the reason why a gas may be compressed.

When a gas is compressed, its particles are compelled closer together, which reduces the gas's volume and raises its pressure. This is because gas particles may move more freely and occupy more space since they are always moving and have more kinetic energy than solid or liquid particles.

There is an increase in pressure when a gas is compressed because the particles are confined to a smaller space and collide more often with one another and the container walls. Boyle's law, which states that at a fixed temperature, a gas's pressure is inversely proportionate to its volume, describes this phenomena.

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