A typical deposit of cholesterol,C27H460,in an artery has a mass of 3.90mg.how many molecules of cholesterol are present in this deposit?

15.0 g

We are given;

We are required to calculate the remaining mass after three half lives

N = N₀ × 0.5^n

where, N is the remaining mass, N₀ is the original mass and n is the number of half lives.

Therefore;

N = 120.0 g × 0.5^3

  = 15.0 g

Thus, the remaining mass of Thallium-208 is 15.0 g

Alternatively;

120.0 g → 60.0 g (120 × 0.5) → 30.0 g (60 × 0.5) → 15.0 g (30 × 0.5)

For the Thallium-208 sample, after each half-life, the amount of the substance was reduced by half. After three half-lives, 15.0 g of the original 120.0g sample will remain.

In the concept of radioactive decay, each half-life is the period of time it takes for half of a substance to decay. We can determine how much of a radioactive isotope is left after a certain number of half-lives, such as the time span of three half-lives in this case, by reducing the original amount by half for each half-life period.

Let's apply this principle to your question. You start with a 120.0 g sample of Thallium-208. After the first half-life, half of the sample will have decayed, leaving 60.0 g. After the second half-life another 50% decays, leaving 30.0 g. Lastly, after the third half-life, the amount remaining is halved again, hence we have 15.0 g of Thallium-208 remaining.

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In a reaction between acetic acid (HC2H3O2) and calcium hydroxide (Ca(OH)2), the products are calcium acetate (Ca(C2H3O2)2) and water (H2O). This is a neutralization reaction resulting in the formation of a salt and water.

The reaction between acetic acid (HC2H3O2) and calcium hydroxide (Ca(OH)2) is an example of a neutralization reaction where an acid reacts with a base. In this case, acetic acid and calcium hydroxide react to form calcium acetate (Ca(C2H3O2)2) and water (H2O), which are the products of the reaction. This type of reaction involves the swap of cations and anions between the acid and the base to form the new products: water and a salt (calcium acetate in this case).

Once balanced, the chemical equation should look like this:
2 HC2H3O2(aq) + Ca(OH)2(aq) → Ca(C2H3O2)2(aq) + 2 H2O(l)

Answer:

A or first one

Explanation:

trust meeeeeee

Answer:

P = 8000 Kg m/s

When speed is increased to 50 m/s,

P = 40,000 kg. m/s

Explanation:

Given data:

Mass = 800 Kg

Velocity = 10 m/s

Momentum = ?

Speed increased = 50 m/s

Momentum = ?

Solution:

Formula:

P = mv

P = 800 kg× 10 m/s

P = 8000 Kg m/s

When speed is increased to 50 m/s.

P = mv

P = 800 kg× 50 m/s

P = 40,000 kg. m/s

The answer is D) "Genes usually have two alleles and carry instructions for proteins that express traits. Alleles are alternative forms of the instructions."

Hope this helped!

Answer:

c

Explanation:

The law of conservation clearly states that energy can neither be created nor destroyed

The answer is argon !

Explanation:

The answer is argon !

Answer:

Limestone is easily eroded from above and below.

Explanation:

The Florida bedrock is largely made of limestone. Because limestone is a rock that is easily eroded, the landscape of a great part of Florida is classified as karstic.

Karstic landscapes are dotted by sinkholes, underground rivers, caves, and springs. The more acidic the groundwater or rainwater, the faster and more easily the limestone will succumb to erosion.

In this way, underground rivers, streams, runoff, rain, and underground water pooled in caves have all carved out gaps and caverns in the weak limestone bedrock.

Groundwater weathering erosion chemically weathers limestone due to carbonic acid, leading to features such as caves, sinkholes, and Karst topography. This process is influential in Florida, affecting soil development, topography, and ecological systems.

Groundwater weathering erosion is a significant geologic process, particularly in areas with limestone bedrock, such as Florida. This process involves the chemical weathering of limestone primarily due to carbonic acid in groundwater. As rainwater permeates the ground, it combines with carbon dioxide to form carbonic acid. This mild acid can dissolve limestone, creating features such as caves, sinkholes, and Karst topography. Over time, water traveling along fractures and joints in the bedrock dissolves limestone, carrying it away and enlarging these openings. Eventually, massive underground voids can form which, when they collapse, lead to the formation of sinkholes on the surface. This process not only affects the physical landscape but also has implications for groundwater movement and ecology.

The physical disintegration and chemical decomposition of limestone not only shape the topography but also contribute to soil development. As limestone is weathered, the released minerals and altered rock particles mix with organic matter to form soil, with distinct horizons emerging over time. In Florida, this process is important for understanding the regional environment and guides in various land-use practices, such as cautious use of fertilizers to prevent groundwater contamination through sinkholes and other channels.

Answer: biotic factors or biotic factors

Explanation:

Color change is most indicative of acid-base type of chemical reaction.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.

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Answer:

Bombardment by asteroids

Explanation:

All of the other ones explain themselves

Answer:

c. differ in electronegativity

Explanation:

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.  

The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive . The bond is polar.

When the elctronegativity difference is 0.4 or less than 0.4 the bond is non polar.

if the electronegativity difference is greater than 0.4 the bond is polar.

A polar covalent bond is likely to form between two atoms that differ in electronegativity, resulting in an unequal sharing of electrons and a molecule with a partial negative and positive charge.

A polar covalent bond is likely to form between two atoms that c. differ in electronegativity. This is because, in a polar covalent bond, one atom has a greater attraction for the electrons than the other atom. If the relative attraction, or electronegativity, of an atom for electrons is significant enough to create an unequal sharing of electrons, the result is a polar covalent bond with one end of the bond having a slight negative charge and the other end having a slight positive charge.

For example, in a water molecule, the oxygen atom is more electronegative than the hydrogen atoms, resulting in a polar covalent bond where the shared electrons spend more time closer to the oxygen nucleus, giving it a slightly negative charge and leaving the hydrogen atoms with a slightly positive charge.

Answer:

chlorine (Cl), bromine (Br), fluorine (F)

Explanation:

as of writing this explanation, pokimane has been banned on twitch

87.75 g of fructose

Explanation:

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume

number of moles of fructose = 1.5 × 0.325

number of moles of fructose = 0.4875 moles

number of moles = mass / molar weight

mass =  number of moles × molar weight

mass of fructose = 0.4875 × 180

mass of fructose = 87.75 g

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Answer:

Synthesis

Explanation:

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

General equation;

A + B → AB

The given reaction is synthesis reaction.

Chemical equation:

2Al + Cl₂ → 2AlCl

it is also redox reaction because oxidation reduction take place.

The oxidation state of aluminium and chlorine is zero on left side while it on right side aluminium become cation with charge of +1 and chlorine become anion with a charge of -1.

Aluminium is reducing agent while chlorine is oxidizing agent.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized.

Answer:

D. Sound waves

Explanation:

The following options are missing:

A. radio wave

B. X-rays

C. Light waves

D. Sound waves

There are two kinds of waves: longitudinal and transverse.

In longitudinal waves, the vibrations are parallel to the direction of wave travel. Examples of longitudinal waves include: sound waves  and ultrasound waves.

In transverse waves, the vibrations are at right angles to the direction of wave travel. All electromagnetic waves (e.g. light waves, microwaves, radio waves and X-rays) are transverse waves.

A longitudinal wave is a type of wave in which the disturbance or movement of the particles is parallel to the direction of the wave propagation. Sound waves and seismic P-waves are examples of longitudinal waves. In contrast to transverse waves where the disturbance is perpendicular to the direction of wave propagation.

In physics, a common example of a longitudinal wave is a sound wave in air or water. In these waves, the periodic variations in pressure or disturbances are parallel to the direction of wave propagation. Other examples of longitudinal waves are seismic waves generated by earthquakes, specifically the compressional or P-waves, which move particles in the same direction as the wave itself.

In contrast, in transverse waves, such as those created on the strings of musical instruments, the disturbance or movement of the particles is perpendicular to the direction of wave propagation. It's important to note that some waves, like ocean waves and seismic waves, can consist of both transverse and longitudinal wave components.

To further clarify, consider a toy spring. If you create a disturbance by stretching and then compressing the spring in a horizontal direction, similar to how particles move in response to a sound wave, this represents a longitudinal wave.

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Answer:

Heated water is more dense than melted snow because water as liquid is denser than ice. Ice floats on water, which means that it has less density than water. Heated water is warmer and more dense than melted ice.

Explanation:

The intertidal zone  is not a zone in the three-layered structure of the ocean relating to density. Therefore, option B is correct.

The intertidal zone is the area between high and low tides where the ocean meets the land. The Monterey Bay National Marine Sanctuary's tide pool.

Intertidal zones can be found anywhere the ocean meets the land, ranging from steep, rocky ledges to long, sloping sandy beaches and mudflats that can stretch for hundreds of meters.

Population density is often measured in three different ways. There is arithmetic density, physiological density, and agricultural density.The intertidal zone is the area where the ocean and land meet. It is not a zone in the ocean's three-layered structure.

Thus, option B is correct.

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Answer:

C) nonmetal

Explanation:

Given;

The sample is in liquid state and do not conduct electricity.

We have given four types of classification.So for first,

A) Ionic

Ionic compounds are found in solid state at room temperature and it conducts electricity when dissolved in water. Hence the sample could not be ionic.

B)Metal

Metals are found in solid state at room temperature  except mercury and it conducts electricity very well. Mercury also conducts electricity.So the sample is not a metal.

C)Nonmetal

Non metals are found in solid state  except bromine which is in liquid state  at room temperature and it does not conducts electricity.

Here the property of nonmetal matches with the sample, so the sample is a nonmetal and it could be Bromine.

D)Salt

Salt is an ionic compound  found in solid state at room temperature and it conducts electricity when dissolved in water. Hence the sample could not be salt.

Answer:

C for k12

Explanation:

Positive.............

Answer:

If you place a positive charge into an electric field, it will move in the  direction indicated by the electric field lines.

Explanation:

The electric field is directed radially outward from a point charge in all directions. So when the charge is positive, the force it suffers will be parallel to, the electric field, and if it is negative the force will be opposite to the field.

Answer:

876.672 g

Explanation:

Data given:

moles of antimony (Sb) =7.20  mol

Molar mass of Sb= 121.76 g

Mass in grams of Sb

Formula to be used

                      no. of moles = mass in grams / molar mass

For antimony (Sb) we can write as

        no. of moles of Sb = mass in grams of Sb / molar mass of Sb

Rearrange above equation

    mass in grams of Sb = no. of moles of Sb x molar mass of Sb . . . . . . .(1)

Put values in above formula (1)

 mass in grams of Sb = 7.20 mol x 121.76 g/mol

mass in grams of Sb = 876.672 g

Final answer:

The mass of 7.20 mol of antimony, given its molar mass of 121.76 g/mol, is calculated to be 876.672 grams by multiplying the number of moles by the molar mass.

Explanation:

To determine the mass in grams of 7.20 mol of antimony, with a molar mass of 121.76 g/mol, you use the formula mass = moles × molar mass. Therefore, the calculation should be as follows:

Mass of antimony = 7.20 mol × 121.76 g/mol = 876.672 g

This calculation shows that 7.20 moles of antimony has a mass of 876.672 grams. To solve such problems, always ensure to multiply the number of moles given by the substance's molar mass, which in this case is derived from the periodic table for antimony (Sb).

Answer:

Explanation:

Given data:

1) How many particles of water are there in 14 moles?

Answer:

84.308 × 10²³ particles

Explanation:

Given data:

Number of moles = 14 mol

Number of particles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

One moles = 6.022 × 10²³ particles

14 mol × 6.022 × 10²³ particles / 1 mol

84.308 × 10²³ particles

2) How many moles of forks do you have if there are 1.4 x 1027 forks?

Answer:

0.23 × 10⁴ moles

Explanation:

Given data:

Moles of fork = ?

Number of moles of fork = 1.4 x 10²⁷forks

Solution:

one mole = 6.022 × 10²³ fork

1.4 x 10²⁷forks × 1 mol / 6.022 × 10²³ fork

0.23 × 10⁴ moles

3) How many molecules are in 23 moles of oxygen?

Answer:

138.506 × 10²³ molecules

Explanation:

Given data:

Number of moles = 23 moles

Number of molecules = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

one mole = 6.022 × 10²³ molecules

23 mol × 6.022 × 10²³ molecules / 1 mol

138.506 × 10²³ molecules

4) How many atoms in 3.00 moles of water?

Answer:

18.066 × 10²³ atoms

Explanation:

Given data:

Number of moles = 3.00 moles

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

one mole of water = 6.022 × 10²³ atoms of water

3 mol × 6.022 × 10²³ atoms / 1 mol

18.066 × 10²³ atoms

5) How many molecules of methane do you have in 0.99 moles of methane?​

Answer:

6 × 10²³ molecules

Explanation:

Given data:

Number of moles of methane  = 0.99 moles

Number of molecules = ?

Solution

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

one mole of methane = 6.022 × 10²³molecules of methane

0.99 mol × 6.022 × 10²³  molecules / 1 mol

6 × 10²³ molecules

Gold cyanidation ( which is also known as the cyanide process or the MacArthur-Forrest process) is a hydro-metallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction

The MacArthur Forrest process is used for the extraction of gold. It involves the use of a weak cyanide solution to dissolve the gold from its ore, which is then separated and refined to obtain pure gold.

The MacArthur Forrest process is used for the extraction of gold.

This process, also known as the cyanide process or cyanidation, involves the use of a weak cyanide solution to dissolve the gold from its ore.

Here are the steps:

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Answer:

The over all charge on atom will be +2.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example

X is the element having 12 protons  10 electrons and 14 neutrons.

The number of protons and electrons are not equal which means two electrons are lose by the given atom and it is present in the form of cation.

The over all charge on atom will be +2.

Answer:

2 loss of electrons.

Explanation:

An atom of any element either metal or nonmetal form ions by losing or gaining electron. This is because protons are embedded in the nucleus with neutrons and electrons are found in different orbits surround the nucleus.

Metals have 1 or 2 or 3 electrons in their outermost shell which is called valence shell and electrons in these shell is called valence electron.So they lose electrons to form ions.Metals lose electrons and positively charged ions called cations.

Whereas nonmetals have 5 or 6 or 7 electrons in their outermost shell so they gain electrons to form ions.

For example Aluminium is a metal having electronic configuration (2,8,3). That means aluminium have 3 electrons in its valance shell so it loses its electrons to become a positively charged ion.

Another one is Sodium a metal having electronic configuration (2,8,1). That means aluminium have 1 electrons in its valance shell so it loses its electrons to become a positively charged ion.

Metal atoms are most likely to form ions by losing electrons, which makes them cations. This process helps achieve a more stable electron configuration by having the same number of electrons as the previous noble gas.

Metals atoms are likely to form ions by losing electrons, so the correct answer is 2: loss of electrons. When metals lose electrons, they become cations, which are positively charged ions. This allows them to achieve a more stable electron configuration by having the same number of electrons as the previous noble gas. For example, a calcium atom loses two electrons and becomes a calcium ion with a 2+ charge.

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Final Answer:

Approximately [tex]\(9.18 \times 10^{23}\)[/tex]molecules of substance B are produced when 29.3g of substance A reacts.

Explanation:

To determine the number of molecules of substance B produced when 29.3g of substance A reacts, we follow these steps:

Step 1: Convert the mass of A to moles.

Given mass of A = 29.3g

Molar mass of A = 19.2g/mol

Number of moles of A = [tex]\( \frac{{\text{{Given mass}}}}{{\text{{Molar mass}}}} \)[/tex]

[tex]\[ \text{{Moles of A}} = \frac{{29.3 \, \text{{g}}}}{{19.2 \, \text{{g/mol}}}} \][/tex]

[tex]\[ \text{{Moles of A}} \approx 1.526 \, \text{{mol}} \][/tex]

Step 2: Convert the number of moles of A to the number of moles of B.

Given chemical reaction (assuming a 1:1 ratio for simplicity):

[tex]\[ \text{{A}} \rightarrow \text{{B}} \][/tex]

Since the ratio is 1:1, moles of A equals moles of B.

[tex]\[ \text{{Moles of B}} = \text{{Moles of A}} \][/tex]

[tex]\[ \text{{Moles of B}} \approx 1.526 \, \text{{mol}} \][/tex]

Step 3: Convert the number of moles of B to molecules of B.

Avogadro's number states that 1 mole of any substance contains [tex]\(6.022 \times 10^{23}\)[/tex]  molecules.

[tex]\[ \text{{Molecules of B}} = \text{{Moles of B}} \times (6.022 \times 10^{23} \, \text{{molecules/mol}}) \][/tex]

[tex]\[ \text{{Molecules of B}} \approx 1.526 \times (6.022 \times 10^{23}) \][/tex]

[tex]\[ \text{{Molecules of B}} \approx 9.18 \times 10^{23} \, \text{{molecules}} \][/tex]

Therefore, approximately [tex]\(9.18 \times 10^{23}\)[/tex]molecules of substance B are produced when 29.3g of substance A reacts.

The covalent bond between 2 atoms where each atom contribute 3  electrons is called a triple bond. In a triple bond, two are pi bonds and one is a sigma bond.

Covalent bonds are formed between  two non-metals  through sharing of electrons. Two electron deficient atoms shares their valence electrons each other to achieve octet and forms covalent bonds.

Covalent bonds can be single, double or triple bonds. Single bonds are sigma bonds. Double bonds are formed through one sigma bond and one pi bond formed through sideways overlapping.

In a single bond each atoms shares one electron. In double bond each atom shares two electrons and in triple bonds, 3 electrons are shared by each atom. Hence, option D is correct.

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Answer:perimiter

Explanation:

Answer:

0.241  × 10³⁰ molecules

Explanation:

Given data:

Mass of Cr(HCO₃)₃ = 9.273 × 10⁷ g

Number of molecules = ?

Solution:

Number of moles = 9.273 × 10⁷ g/ 235 g/mol

Number of moles = 0.04× 10⁷  mol

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 0.04× 10⁷  moles of Cr(HCO₃)₃:

0.04× 10⁷  moles × 6.022 × 10²³ molecules / 1 mol

0.241  × 10³⁰ molecules

Answer:

ZnCO3 + 2HClO4 = Zn(ClO4)2 + CO2 + H2O

Explanation:

ZnCO3 + 2HClO4 = Zn(ClO4)2 + H2CO3

ZnCO3 + 2HClO4 = Zn(ClO4)2 + CO2 + H2O

Final answer:

Zinc metal reacts with hydrochloric acid to produce zinc chloride and hydrogen gas, represented by the balanced equation Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g).

Explanation:

The reaction between zinc metal and hydrochloric acid (HCl) is a single-displacement reaction that produces zinc chloride (ZnCl2) and hydrogen gas (H2). The balanced chemical equation for this reaction is:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

This reaction is an example of the combination of stoichiometry and the ideal gas laws that can occur in chemical reactions.

The volume of the can of dog food is approximately 74.8 cubic inches.

To calculate the volume of the can of dog food, we use the formula for the volume of a cylinder, which is V = (pi x [tex]r^2[/tex] x h), where V is the volume, pi is approximately 3.14159, r is the radius of the base, and h is the height of the cylinder.

First, we need to find the radius of the base. We know the area (A) of the circular base is 12.5 in2, and the area of a circle is given by A = pi x [tex]r^2[/tex]. We can solve for r:

A = pi x [tex]r^2[/tex]

12.5 = 3.14159 x [tex]r^2[/tex]

[tex]r^2[/tex] = 12.5 / 3.14159

[tex]r^2[/tex] = 3.981

r = [tex]\sqrt{3.981}[/tex]

r = 1.994 inches approximately.

Now that we have the radius, we can calculate the volume of the can:

V = pi x [tex]r^2[/tex] x h

V = 3.14159 x [tex](1.994 in)^2[/tex] x 6 in

V = 74.8 in3 (rounded to one decimal place).

Thus, the volume of the can of dog food is approximately 74.8 cubic inches.