A. The atomic number (Z) of an element is the number of protons in the nucleus of atoms of that element. Because the net charge on an atom is zero, the number of protons is equal to the number of electrons. Thus, the atomic number also gives the number of electrons in a neutral atom. The mass number (A) of an atom is the total number of nucleons (protons plus neutrons). Therefore, the number of neutrons in an atom can be found by subtraction:

Mass number – atomic number = number of neutrons

Atomic Number Mass Number Number of protons Number of neutrons Number of electrons Element Symbol
6 6
39 19
77 Xe
64 29
35 45

1. 5005 ml blood is in the body. 2. On average, 68.9gram of blood does the heart pump with each heart beat.

The term density is defined as the ratio of mass and volume. It is represented by the formula density = mass / volume.

Given :

1. Density of blood = 1060 kg/m^3

At a resting pulse rate of 77 beats per minute, the human heart typically pumps about 65 mL of blood per beat. Circulating all the blood in the body through the heart takes about 1 min for a person at rest

Since we are given that heart beats per minute = 77

And Heart pumps about 65 mL of blood per beat

Therefore, blood in the body is 77 × 65 = 5005 ml

2. mass = volume × density

Then,  mass of blood does the heart pump with each heart beat

= volume × density

mass = 65ml × 1060 kg/m^3

mass = 68.9gram

Thus, 1. 5005 ml blood is in the body. 2. On average, 68.9gram of blood does the heart pump with each heart beat.

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Granite is formed from cooled molten rock, while gneiss is formed solid rock bedt compares the way that these rocks are formed.

What is molten rocks?

Molten rocks, also known as magma, is hot, liquid rock that is found beneath the Earth's surface. It is formed when heat and pressure cause rocks to melt, releasing gas and other materials. Molten rocks can contain crystals, gas bubbles, and other materials.    When molten rock reaches the Earth's surface, it is called lava. Molten rocks can be made of many different minerals, including basalt, andesite, and rhyolite.

Therefore, Granite is formed from cooled molten rock, while gneiss is formed solid rock bedt compares the way that these rocks are formed.

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A safety data sheet is a document which contains information regarding occupational safety and health hazards pertaining to a certain chemical product.

A variety of data is listed on the  safety data sheet which can be used as and when required. The data that can be read from the safety data sheet include Chemical Product and Company Identification, Composition, Information on Ingredients, Hazards Identification, First Aid Measures, Fire Fighting Measures, Accidental Release Measures, Handling and Storage, Exposure Controls, Personal Protection, Physical and Chemical Properties, Stability and Reactivity , Toxicological Information, Ecological Information, Disposal Considerations, Transport Information, Regulatory Information, etc. The more recent Safety Data Sheet format is internationally standardised, unlike the older MSDS formats, which might vary from source to source within a nation according on national restrictions.

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Answer:The Diels-Alder reaction is a conjugate addition reaction of a conjugated diene to an alkene or alkyne (the dienophile) to produce a cyclohexene.

Explanation:

Bromoethene, also known as 1,2-dibromoethene or ethylene dibromide, is an unsaturated compound with a double bond between the carbon atoms. Dienophiles are molecules that can react with a diene, which is a compound with two double bonds, to form a cyclic compound through a Diels-Alder reaction.

Bromoethene is not considered a dienophile in the Diels-Alder reaction. The Diels-Alder reaction is a type of pericyclic reaction that requires a high degree of orbital symmetry between the dienophile and diene, and the double bond in bromoethene does not possess the required symmetry for this reaction. Additionally, the bromine atoms in bromoethene are electron-withdrawing and decrease the reactivity of the double bond, making it less likely to act as a dienophile.

Therefore, it is unlikely that bromoethene would act as a dienophile under mild conditions.

Answer:

16y^4

Explanation:

(2y)^4 can be written as 2^4 * y^4, which simplifies to 16y^4.

Many covalent bonds boron will form is this the maximum number of bonds boron will form we can expect boron to form three bonds since it has three valence electrons.

Since it takes one electron from each atom to form a single bond, we can expect boron to form three bonds since it has three valence electrons. We can see this in the molecule borane BH3. Here, boron forms three covalent bonds, using all three of its valence electrons in single bonds to the hydrogens.the second electron shell has a maximum occupancy of eight electrons. This means that there’s a space for two more electrons in the second electron shell. Since boron only has three valence electrons, it can only form three covalent bonds maximum.

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The kind of bond at the arrow is peptide bond.

The carboxyl group of one amino acid is connected to the amino group of another amino acid by a chemical interaction known as a peptide bond. Two or more amino acids are joined together by peptide bonds to form the final molecule, known as a peptide.

A peptide bond is most likely shown by the arrow in the illustration. The amino acids in a protein or peptide chain are joined together by a sort of covalent connection known as a peptide bond, which develops between the carboxyl group of one amino acid and the amino group of another. The covalent link between the nitrogen and carbon atoms is an amide bond.

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When a current flows through a wire over an extended period of time, heating effect takes place, meaning the temperature of the wire rises, which causes the wire's resistance to rise.

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As per the given reaction, 2 moles or 46 g of LiOH is needed to completely react with CO₂. Then, 25.5 g of CO₂ requires 1.16 moles of LiOH.

Lithium hydroxide is an ionic compound formed by the combination of metallic lithium and water moiety. LiOH easily reacts with carbon dioxide forms an insoluble compound lithium carbonate and water.

As per the given balanced equation of the reaction between LiOH and carbon dioxide, one mole of CO₂ reacts with 2 moles of LiOH.

molar mass of CO₂ = 44 g/mol

molar mass of LiOH = 23 g/mol

mass of 2 LiOH = 46 g.

Then, mass of LiOH needed to react with 25 .5 g of CO₂ = (25.5 × 46) /44 = 26.13 g

Number of moles in 26.13 g of LiOH = 26.13/23 = 1.16 moles.

Therefore, the number of moles of LiOH are needed to react completely with 25.5 g of CO2 is 1.16 moles.

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Scientists have developed a theory of how the universe formed called the big bang (question a), which suggests the universe is expanding (question 2) and it is based on the relative temperature/light of far way celestial bodies (question 3).

The big bang theory is a theory used to explain the origin of the universe, which is based on data from nature and astronomical observations.

Therefore, with this data, we can see that the big bang theory is based on experimental and observational data and suggest the universe is continuously expanding.

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Answer:

Explanation:

1

 atom of

Cu

has a mass of

1.055

×

10

−

22

g

.

Explanation:

1 atom Cu

⋅

1 mol Cu

6.022

×

10

23

atoms Cu

⋅

63.546 g Cu

1 mol Cu

=

1.055

×

10

−

22

g Cu

1 atom of copper must be converted in moles to express it as a quantity that can be converted into grams (our second step).

Avogadro's Number

(

1 mole

=

6.022

×

10

23

particles

)

and the relative atomic mass of copper

(

1 mole of copper = 63.546 g

)

are the equalities required to make

Answer:

Explanation:

To be used by plants, the N2 must be transformed through a process called nitrogen fixation. Fixation converts nitrogen in the atmosphere into forms that plants can absorb through their root systems.

Producing energy and manfacturing of the following activities most Mass directly affect the water supply

An object's mass is determined by how much matter it has. Anything that has more substance will weigh heavier overall. For instance, because an elephant contains more stuff than a mouse does, it has a heavier mass. How much energy an object contains is not determined by its size.

The resistance of the body to acceleration (change in velocity) when ever a net force is employed can be measured experimentally as mass, which is equivalent to inertia. The gravitational pull of an object to other bodies is also dependent on its mass.

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The following experimental findings illustrate the mass laws:

1. The law of definite composition states that a compound has a definite composition if the same amounts of copper and bromine are used in both tests and the same amount of the white compound is generated.

2. Law of mass conservation: In both experiments, the amount of copper and bromine utilised is equal to the amount of white compound generated plus the amount of unreacted copper or bromine. This is known as the law of mass conservation. This demonstrates the law of mass conservation since it demonstrates that the mass of the reactants and products are equal.

3. Law of multiple proportions is not demonstrated in these experiments as only one compound is formed and the same proportion of elements is used in both experiments.

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The amount of electricity is required to deposit one mole of aluminium from a solution of [tex]$\mathrm{AlCl}_3$[/tex] exists Three Faradays.

The unit of measurement used by chemists known as a mole is very significant. In the same way that having a dozen eggs implies you have twelve eggs, having a mole of anything indicates you have 602,214,076,000,000,000,000,000 of that thing. When measuring very small objects like atoms, molecules, or other particles, chemists must use moles.

In the International System of Units, a substance's amount is measured in moles, which are denoted by the sign mol. The quantity of a substance is a measurement of the number of elementary entities of a specific substance present in an object or sample.

The quantity of atoms is measured in terms of moles. Mole conversion can be done for units like grams and milligrams.

[tex]$$A l^{3+}+3 e^{-} \rightarrow A l$$[/tex]

The amount of electricity required = 3 Faraday.

Therefore, the correct answer is option C. Three Faradays,

The complete questions:

What amount of electricity is required to deposit one mole of aluminium from a solution of [tex]$\mathrm{AlCl}_3$[/tex] ?

A. One Faraday

B. One ampere

C. Three Faradays

D. Three amperes

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Non metals react with oxygen to form non-metallic oxides. For example, SO2 , NO2 , etc. These are usually acidic in nature. This is the reason for acid rain.

Examples:

C ( s ) + O 2 ( g ) → CO 2 ( g )

H 2 ( g ) + O 2 ( g ) → 2 H 2 O ( l )

S + O2→ SO2

Answer:

A non-metal oxide is produced when a non-metal burns in oxygen.

Explanation:

The word equation for the overall reaction is as follows:

Oxygen with non-metal result in non-metal oxide.

Non-metal + oxygen → Non-metal oxide

Answer:

because of the balance in centripetal and centrifugal forces.

Answer:

The earth's momentum, its centripetal and centrifugal forces, prevent it from falling into the sun.

The statement is true that for a given reaction, kc is the equilibrium constant based on the molar of reactants and products while kp is the equilibrium constant based on the partial of reactants and products.

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The oxygen content of something like a metal oxide matching the composition MO is 19.66%. The element M is represented by the Zn symbol.

The elements with boiling and melting temperatures and glossy crystalline solids are known as metals. Metals are efficient heat and electrical conductors. Metals like iron, aluminium, nickel, silver, and tin, for instance, are utilized frequently in our daily lives.

Native Metals were originally discovered and used by ancient man around 5000 BC. In the following two thousand years, up until the beginning of the Bronze Age, humankind perfected the techniques for discovering, working with, and using these local metals. Gold nuggets were frequently the simplest to locate and utilize.

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H₂ gas  expected to behave most like an ideal gas in condition of temperature 500 K and pressure 0.1 atm.

When temperatures and pressures are extremely high and low, real gases will behave like ideal gases. Nevertheless, actual gases are less likely to behave optimally at lower temperatures and pressures.

PV=nRT is the ideal gas equation, where P is the gas pressure.

V = Gas Volume

Gas constant: R

T = gas temperature

n = the quantity of gas moles.

When the amount of gas molecules and the intermolecular interactions between them are minimal, the ideal gas functions properly. Low pressure and high temperature make this possible.

Hydrogen gas will therefore most likely possess/behave like an ideal gas at 500 K and 0.10 atm.

Consequently, we can say that the conditions under which a sample of neon gas behaves most like an ideal gas ; 500K and 0.1 atm

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The mechanism through which local anesthetics reduce pain is selective blockade of Sodium, or Na+, channels.

The subunit of voltage-gated Na+ channels is targeted by local anesthetics, which blocks the channels and stops nerve impulses from being generated or transmitted. As a result, the incoming pulse of depolarization along the nerve is stopped dead in its tracks because Na+ ions cannot enter the cell. proportion of ionized local anesthetic molecules. In a split second, ionization to unionization occurs in molecules of local anesthetic. It has been shown in several clinical investigations that the addition of sodium bicarbonate to a clinical nerve block can have a variable effect, however this does not always translate to a quicker start of anesthesia.

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In determining the reactivity of an electrophile in a nucleophilic substitution reaction, steric hindrance plays an important factor.

According to the concept of electrophilicity, an electron-deficient atom(electrophile) is attacked by electron-rich species (nucleophile).

The extent of steric hindrance determines the rate of a reaction.

SN2 reactions occur in primary, secondary  and methyl carbon electrophiles. Out of these, the unhindered methyl carbon electrophiles will react the fastest, and more hindered secondary carbon electrophiles will react the slowest. Assuming that, all the other reaction conditions used are identical in nature. SN2  reactions generally do not occur in tertiary carbon electrophiles.

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One mole of aluminum  contains 6.02 × 10²³ Al  atoms or formula units. Hence, 4.70 × 10²⁴ atoms  of Al  contains 7.8 moles of Al.

One mole of a substance is its amount containing 6.02 × 10²³  atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Similarly one mole of every compound contains 6.02 × 10²³  molecules. The mass of one mole of an element  is called its atomic mass.

Al is 13th element in periodic table. Zn is a transition metal.  One mole of Al  contains 6.02 × 10²³ Al atoms . Hence number of moles of  4.70 × 10²⁴atoms  is:

4.70 × 10²⁴ / 6.02 × 10²³  =7.8 moles  .

Hence, there will be 7.8 moles of  aluminum.

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The statements that are true regarding acids and bases are: Aqueous ammonia does not produce toxic vapors but ammonium hydroxide does. Hydrogen fluoride is the safest of all the hydrogen.

halides. Nitric acid causes yellowing of the skin by denaturing proteins. When preparing aqueous solutions of acid, it is important to add the acid to the water to dissipate heat. strong acids and bases, and some weak, cause irreversible damage to living tissue It is not always true that all concentrated acids require a special hood to deal with the vapors, it depends on the acid in question and the concentration. The statements that are true regarding acids and bases are: Aqueous ammonia does not produce toxic vapors but ammonium hydroxide does. Hydrogen fluoride is the safest of all the hydrogen. Preparing solutions of bases can cause the water to boil but also depends on the base and the concentration.

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Answer: Hormone

Explanation: Hormones are proteins hence being made from amino acids. They are stored in glands and regulates body functions. For example when you meet something you're scared of or something dangerous, your adrenal gland will secrete adrenaline which increases your heart rate putting you in a fight or flight situation.

They are positively charged and they are formed by removing electrons from a neutral atom.

A cation may be defined as an atom or molecule that is positively charged.

By shedding its single valence electron, a neutral sodium atom is likely to acquire an octet in its outermost shell.

                                       Na→Na++e−

To distinguish it from the element, the cation created in this manner, Na+, is known as the sodium ion. The second electron shell, which contains eight electrons, is the sodium ion's outermost shell. This satisfies the octet rule.

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The given statement, "When a system reaches equilibrium, the transition of individual molecules from reactants to products or products to reactants stops, and all molecules remain in the respective states they were in when equilibrium was reached" is true (T) because at chemical equilibrium, all molecules to remain in their respective states.

In a chemical reaction at equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction. As a result, the concentration of the reactants and products remains constant over time, meaning that the transition of individual molecules from reactants to products or vice versa stops. The state of all the molecules remains unchanged from when the system reached equilibrium, making it a state of balance between the forward and reverse reactions. The position of equilibrium can shift if the conditions of the reaction change (such as temperature, pressure or concentration), but the system will always strive to reach a new balance once again.

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A second is defined as the time taken by 9192631770 radiation cycles to shift the cesium-133 atom's fundamental state from one level to another (si unit of time).

Simply expressed, the study of the chemical compound that radiation, typically ionizing radiation, induces in matter is known as radiation chemistry. Common themes in the field include radiation-induced particle nucleation and growth, radiation-enhanced H 2 generation, A second is defined as the time taken by 9192631770 radiation cycles to shift the cesium-133 atom's fundamental state. And damaging effects on nuclear system chemistry. Due to its ground state electron state's [Xe] 6s1 configuration, the caesium atom's atomic term symbol is 2 S 1/2. This shows that the atom has a single unpaired electron and an overall electron spin of 1/2.

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a) The velocity x(t) = 8sint

The position x'(t) = 8cost

The acceleration x"(t) = -8sint

b) position, x(t) =  4√3 cm.

   velocity, x'(t) = 4 cm/s

   acceleration, x"(t) = -4cm/s²

a) The velocity, position and acceleration at the time t is as follows :

The velocity x(t) = 8sint

The position x'(t) = 8cost

The acceleration x"(t) = -8sint

b) The position, velocity and the acceleration of the mass at the time t = 2π / 3.

The position, x(t)=8sin(2π /3)

                            = 4√3 cm.

The velocity, x'(t) = 8cos(2π /3)

                             =  4 cm/s

The acceleration, x"(t) = 8sin(2π/3)

                                      = -4cm/s²

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