what causes the lines in these spectra? why are the colors of the lines different? suggest a reason for the observation that the spectrum of calcium is more complicated than the spectrum of hydrogen.

The  5  major parts of the long bone are :

.The  Proximal epiphysis

. The distal ephiphysis

.The compact bone

.The Diphysis

.The metaphysis.

What are long bones?

They are long, wide, and cylindrical in shape. They act as levers. e.gFemur, tibia, fibula, metatarsals, humerus, ulna, radius, metacarpals, and phalanges.

The five major parts of a long bone

.The  Proximal epiphysis: This is made up of the spongy bone and articular cartilage.

.The distal epiphysis: This is enclosed by a membrane of connective tissue called the periosteum.

.The metaphysis: This is made up of an epiphyseal line and red bone marrow.

.The Diphysis: This is found in the medullary cavity which has an inner core of bone marrow. It contains nutrients and helps in the formation of cells, made up of yellow marrow in the adult and red marrow in the child.

.The compact bone: This is the outer shell of the long bone is made of cortical bone called compact bone.

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0.78 m³ is the volume of the same sample at standard temperature and pressure(stp) will be closest to the volume at 350 k and 1 atm.

The ideal gas law (PV = nRT) explains how the macroscopic properties of ideal gases are connected. The particles in an ideal gas are those that: (a) do not interact with one another; and (b) take up no space (have no volume). The ideal gas law does provide a good approximation of real gas behavior in many circumstances, but no gas is truly ideal.

PV = (nRT)

Where;

P₁ = initial pressure = 1 atm

V₁ = initial volume = 1 m³

T₁ = initial temperature = 350 k

P₂ = final pressure = 1 atm

V₂ = final volume = ?

T₂ = final temperature = 273 k

P₁V₁ / T₁ = P₂V₂ / T₂

Solving for V₂;

V₂ = P₁V₁T₂ / P₂T₁

V₂ = 1 × 1 × 273/350

V₂ = 273/350 m³

V₂ = 0.78 m³

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The continuous annual decay rate of carbon-14 is k = ln (0.5)/5730.

The 1/2-life of a radioactive isotope is the quantity of time it takes for one-1/2 of the radioactive isotope to decay. The half of-existence of a selected radioactive isotope is consistent; it's miles unaffected by using situations and is independent of the initial quantity of that isotope.

1/2-life (symbol t1⁄2) is the time required for an amount (of substance) to reduce to half of its initial price. The time period is commonly utilized in nuclear physics to explain how speedy volatile atoms undergo radioactive decay or how long strong atoms survive.

Calculation:-

The functions as an exponential decay function as

P(t)=P₀e^{kt}

given the half-life as 5730 years, that is the time taken to reduce the mass to half

P₀/2 =P₀e^{5730k}

1/2=e^{5730k}

taking the natural log,

5730k=ln (0.5)

we get the exact continuous decay rate as

k = ln (0.5)/5730

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Reduction in tourism and Groundwater recharge are possible environmental impacts of flooding  .

What are floods ?

During floods, people need to quickly move themselves and their most valuable possessions to higher ground. Leaving home in search of a safer place is called evacuation. Floods occur at irregular intervals and vary in magnitude, duration and areas affected.

Water flows naturally from high ground to low ground. This means that low-lying areas can flood quickly before they start reaching higher elevations. In rivers, flooding can occur, especially at bends and meanders in the channel, when flow exceeds the bed's capacity. Floods often damage homes and businesses when they are in the natural floodplains of rivers.

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The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.

The equation for the reaction is :

KHP   +   NaOH   ----->  KNaP     +    H₂O

number of moles of NaOH = volume in L × molarity

                                             = 0.0360 × 0.100

                                             = 0.0036 mol

moles of KHP = moles of NaOH = 0.0036 mol

mass of KHP = molar mass × moles

                     = 204.2 × 0.0036

                     = 0.735 g

percentage of purity KHP =( mass of pure KHP / mass of impure ) × 100 %

                                          = (0.735 / 0.758 ) × 100 %

                                          = 96.9 %

Thus, The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.

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Answer:

It's a chemical change.

Explanation:

The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change. The wax molecules are undergoing a chemical change; they are changing into different molecules by reacting with a substance in the air.

The final temperature after mixing these solutions will be 311K.

This can be calculated using formula:

q = m⋅c⋅(change in temperature)

−q (lost) = q (gained)

This is equivalent to

−50.0g⋅ (T−330)K = 30.0g⋅ (T-280)K

−50⋅T+16500 =30⋅T−8400

80.0⋅T = 24900

T = 311.25 K

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The normal combustion of 8.76 g of glycine produces 28.1 kcal while the combustion in the body produces  18.96 kcal.

We know that a combustion reaction is one in which an object is burnt in oxygen. In this case, we have the reaction in which the amino acid is burnt both in oxygen (normal combustion) and the burning of glycine in the body also occurs.

In this case, we have the number of moles of the glycine that has participated in the reaction is; 8.76 g/75 g/mol = 0.12 moles

In the reaction that occurs  by normal combustion;

4 moles of glycine produces 936 kcal of energy

0.12 moles of glycine produces 0.12 moles * 936 kcal/4 moles

= 28.1 kcal

In the reaction that occurs in the body';

2 moles of glycine produces 316 kcal

0.12 moles of glycine produces 0.12 moles * 316 kcal/2 moles

= 18.96 kcal

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The compound: d) all of the above are correct ( considered a d sugar, has 3 chiral carbons, is considered an aldose )

As a general rule, chiral carbon centres are carbon atoms positioned at the four corners of a tetrahedron and attached to four distinct substituents. Steeogenic carbons and asymmetrical carbon atoms are other names for chiral carbon atoms. The definition of an aldose is a monosaccharide (simple sugar) with a carbon backbone chain, an aldehyde group on the carbon atom at the end, and hydroxyl groups connected to all of the other carbon atoms. Aldoses differ from ketoses, which are considered ketones because they have the carbonyl group away from the end of the molecule. The Lobry-de Bruyn-van Ekenstein transition can isomerize aldoses into ketoses.

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Answer:

1) endothermic reaction - melting of ice to water

2) exothermic reactions - burning of candles

Explanation:

Endothermic reaction:

endothermic reactions are chemical reactions that absorb heat from the environment.

In this case, when ice is melting to turn into water it absorbs heat from its surroundings and melts.

Exothermic reaction:

exothermic reactions are chemical reactions that release heat as a form of energy when a reaction takes place.

In the case of burning a candle, the heat is released into the environment.

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1. The bacterial cell shown is a prokaryotic cell.

2a. The similarities between prokaryotic and eukaryotic cells include:

2b. The differences between prokaryotic and eukaryotic cells include:

Eukaryotic cells are cells that possess a membrane-bound nucleus as well as membrane-bound cell organelles.

Eukaryotic cells are cells of higher organisms such as animals and plants.

Prokaryotic cells are cells that lack a membrane-bound nucleus as well as membrane-bound cell organelles.

Prokaryotic cells are cells of lower organisms such as bacteria.

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Shaped volumes around the nucleus which are occupied by electrons are called Atomic Orbitals.

The quantum mechanical refinement of Bohr's orbit is an orbital. In contrast to his idea of a straightforward circular orbit with a constant radius, orbitals are regions of space that were calculated analytically and have varying possibilities of hosting an electron. A Quantum Mechanical Description of Electrons Around the Nucleus

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Iron(II) oxide ions are contain that lost 2 electron in the oxidation process and iron(III) oxide contain iron that lost 3 electron

Ferrous oxide is commonly known as iron(II) oxide contain iron that lost 2 electron in the oxidation process and so it is able to bond with other atom that have an extra 2 electron and ferric oxide is commonly known as iron(III) oxide and it contain iron that lost 3 electron and iron(II) and iron(II) oxide is the chemical compound with formula Fe₃O₄ and it occur in nature as the mineral magnetite and it is one of the number of iron oxide and the other being iron(II) oxide FeO which is rare and iron(III) oxide Fe₂O₃ which also occur naturally as the mineral hematite

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Answer:

The answer is Inference.

The elements that has the quantum numbers shown are;

The quantum number is used to be able to identify the electron in an atom. We know that the orbital is a region in space where electrons could be fond and electrons are identified in the orbitals where they are found by the use of quantum numbers.

Now we have to use the quantum numbers as shown to be able to identify the elements that have them. This is so because the kind of element can be known from the quantum numbers that its electrons posses.

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The concentration of H₃PO₄ that is needed to neutralize 17.61 ml of 2.869 m NaOH when 31.16 ml of H₃PO₄ is used is 0.540 M.

The balanced equation is given as :

H₃PO₄    +   3NaOH    ------>  Na₃PO₄   +   3H₂O

number of  moles of  NaOH = 0.0176 × 2.869

                                  = 0.050 mol

moles of moles of  H₃PO₄  needed = 0.050 / 3 =0.0168 mol

molarity of  H₃PO₄  = moles / volume in L

                                = 0.0168 / 0.0311

                                = 0.540 M

Thus,  The concentration of H₃PO₄ that is needed to neutralize 17.61 ml of 2.869 m NaOH when 31.16 ml of H₃PO₄ is used is 0.540 M.

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Answer: 10

A cup of coffee has a hydroxide ion concentration of 1. 0 × 10−10 m. The pH of this coffee will be 10

pH = - log [H+]

    = - log [1. 0 × ]

    = - log 1 - ( -10 log 10 )

    = 0 + 10  = 10

The pH of this coffee will be 10

Explanation:

pH after adding 10.0 ml of acid = 9.81, pH after adding 20.0 ml of acid = 5.31.pH after adding 30.0 ml of acid = 1.20

In chemistry, the pH scale is used to define the acidity or alkalinity of an aqueous solution. Historically, pH stood for "hydrogen potential". The pH values ​​of acidic solutions are usually lower than those of basic or alkaline solutions.

An acid (acid catalysis) is any substance that tastes unpleasant in aqueous solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to form salts, and stimulates chemical processes. A Brnsted-Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or form a covalent bond with an electron pair. Proton donors, also known as Brnsted-Lowry acids, are the first class of acids.

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4.609 grams of water will be produced from the combustion of 3.36 g of ethane gas with 9.56 g of oxygen gas. The chemical element with the atomic number 8 and symbol O is called oxygen.

Oxygen belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.

The chemical formula for ethane, a paraffin series hydrocarbon with the properties of being colourless, odorless, and gaseous, is C2H6. The only hydrocarbon with a single carbon-carbon bond has the simplest structural makeup, and that is ethane. The primary use of ethylene, a feedstock for making plastics, is ethane.

A variety of intermediate products, the majority of which are transformed into plastics, are produced by the petrochemical industry using ethylene, which is primarily produced from ethane.

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the rate at which the entropy of the two reservoirs changes is 0.00390837931 kw/k .

What is entropy ?

Entropy, a measure of a system's thermal energy per unit temperature not available for useful work. Work is obtained from molecular motion, the amount of entropy is a measure of the molecular disorder or randomness of a system. The concept of entropy gives us deep insight into the direction of spontaneous change in many everyday phenomena. Introduced in 1850 by German physicist Rudolf Clausius, it is the pinnacle of 19th-century physics.

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Answer:

nothing common dude

Answer:

there are used to where large volumes are needed to be transferred and coloured graduated marks make it easier to measure the volumes. the disadvantage isthat they are not so precise and there are greater changes of human error

Using the ideal gas equation, the volume of the gas is  0.84 L.

We know that an antacid does react with the acid in the stomach and that one of the products of the reaction is the carbon dioxide gas as we can see from the reaction equation; CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g).

If 1 mole antacid molecule produces one mole of carbon dioxide;

Number of moles of antacid = 3.32 g/100 g/mol = 0.0332 moles

Volume of the gas = ?

Number of moles of the gas =  0.0332 moles

Temperature of the gas = 37.0 °C + 273 = 310 K

Pressure of the gas =  1.00 atm

Given that;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

V= nRT/P

V =  0.0332  * 0.082 * 310/1.00 atm

V = 0.84/1

V =  0.84 L

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Polyvinyl chloride (PVC) is mostly used for cable jackets.

PVC cable jackets can withstand heat, sunlight, weathering, oils, acid, and physical abrasion, making them an excellent choice for outdoor cable jackets. It is a thermoplastic material.

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One of the first ten compounds, carbon tetrachloride, is used in a variety of industrial manufacturing processes as well as in consumer products such as paints, adhesives, degreasers, and other things.

An organic molecule called carbon tetrachloride is made up of a core carbon atom that is encircled by four chlorine atoms arranged in a tetrahedron. Because of its extremely low melting point, it is found as a colorless liquid at ambient temperature. It has a wide range of uses, including in cleaning supplies, fire extinguishers, and fumigants. It has been discovered that large amounts of it can have negative health effects.

A substance's solubility refers to its capacity to dissolve in a certain solvent. The fundamental solubility rule tells us whether a given item dissolves in

It is a clear liquid that has a faintly perceptible sweet odor. It is also known as benziform, perchloromethane, methane tetrachloride, carbon chloride, and methane tetrachloride. The most common way to encounter carbon tetrachloride is as a colorless gas in the air. Both its inflammability and ease of dissolution in water are nonexistent.

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Answer: 2

Explanation: For the equation to be balanced, the elements or compounds from the reactant and product sides must be equal.

Everything else was equal except the Na and Cl which on the reactant side it had 2 molecules each and on the product side 1 molecule.  

All you have to do is add 2 Infront of NaCl on the product side to make the reaction balance.

Answer:

5.0 L

Explanation:

Sample of an element. At room temperature, it is a lightweight, brittle solid with a metallic luster. It has fair conductivity that increases with increased temperature the material is is metalloid

An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method and element are further classified into metal, nonmetal and metalloid and metalloid are all solid at room temprature and it appear lustrous but is not malleable or ductile and it is much poorer conductor of heat than the metal and the material has properties of both metal and non metal that means the material is probably metalloid

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