1. To begin, check that this question is shown: The tallest building in the world, the Burj Khalifa
in Dubai, is 0.828 kilometers high. What is the building's height in centimeters? (If this is not
the question you see, click Next until it appears.)
A. What unit is given in the question?
B. What unit is asked for?

It is impossible for an element to have an atomic number of 110.5 because atoms of an element all have the same whole number of protons. Thus, option C is correct.

The atomic number is the number of protons in the nucleus of an atom. The number of protons defines the identity of an element. The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom.

For example, in a sodium atom, there are 11 electrons and 11 protons.

Thus, the atomic number of Na atom = number of electrons = number of protons is equal to 11.

The atomic number is based only on the number of protons in the nucleus of an atom. Since this is a count of whole numbers, it cannot be a decimal. It's either element 110 or 111, not 110.5.

There is no half proton in the atom, hence we can not have an atomic number of 110.5.

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Dilute 500 ml of 0.5 m kcl to a final volume of 3.5l resulting molarity is 0.1428

Molarity is the amount of a substance in a certain volume of solution. molarity is also defined as the moles of a solute per liters of a solution. molarity is calculated as M = no of moles of solute/volume of solution in liter

here, kcl is diluted as 0.5m and final volume is 3.5l so,

M = 0.5/3.5 = 0.1428

So molarity is 0.1428

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4 liters of the 10% solution are needed.

ω₁ = 4% ÷ 100% = 0.04; mass percentage of 8 liters solution

V₁ = 8 L; volume of 4% solution

ω₂ = 10% ÷ 100% = 0.1; mass percentage of solution

ω₃ = 6% ÷ 100% = 0.06; mass percentage of the final 6% solution

V₂ = ?; volume of 10% solution

V₃ = V₁ + V₂; volume of the final 6% solution

ω₁ · V₁ + ω₂ ·V₂ = ω₃ · V₃; formula to calculate volume of the solution

0.04 · 8 L + 0.1 · V₂ = 0.06 · (8 L + V₂)

0.32 L +  0.1 · V₂ = 0.48 L + 0.06 · V₂

0.04 · V₂ = 0.16 L

V₂ = 0.16 L ÷ 0.04

V₂ = 4 L; volume of the 10% solution

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The ratio of the mass in grams of fluorine to the mass in grams of iodine in the three compounds is 13.49

Fluorine mass in grams is 134.9 g and  iodine mass in grams is 10.0 g so here the ratio of this two in the three compound is 134.9/10.0=13.49

The mass of ratio of florine and iodine is 13.49

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The mass of fuel has the airplane taken on is 201145g.

Use the formula [tex]mass = density \times volume[/tex]. And since we are given the value of density, we just substitute it to the formula since the density of a compound is constant at a given temperature. So we have:

mass = [tex]0.821 \dfrac{g}{mL}\times(245 L\times\dfrac{1000mL}{1L}) =201145g[/tex]

Density is the dimension of how tightly a cloth is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

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The objective lens that would you use to reach 100x magnification is known as the Oil immersion objective lens.

Magnification may be defined as the process of making enlarged views of smaller objects like cell specimens with the help of tools and devices.

The Oil immersion objective lens is known to have the most powerful magnification with a whooping magnification range of approximately 1000x when significantly combined with a 10x eyepiece.

Therefore, the Oil immersion objective lens is the objective lens that would you use to reach 100x magnification.

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OCFCs were found in the atmosphere at high levels.

Ozone absorbs the maximum of the ultraviolet radiation from the sun. faraway sensing is the technology of obtaining statistics about gadgets or regions from a distance, usually from aircraft or satellites. A Lidar mild Detection and the ranging image were created with data accrued by NOAA's country-wide Geodetic Survey. In 1985 Jonathan Shanklin turned into a junior researcher at BAS while he determined a hole in the invisible defense that protects us from solar radiation.

The ozone layer, which lies high within the ecosystem, shields us from harmful ultraviolet UV rays that come from the sun. Human activities successfully punched a hollow in it, through the use of gases like chlorofluorocarbons CFCs in spray cans and refrigerants, which wreck down ozone molecules in the top environment. Depletion of the ozone layer has outcomes on humans, animals, and plant life. This is typically a consequence of higher UV degrees achieving us on earth. The chlorofluorocarbons act like ultraviolet radiation inflicting a big amount of ozone to be produced.

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the acronym PASS involves  the steps needed for the operation of the fire extinguisher which are Pull, Aim, Squeeze, and Sweep.

P- Pull the pin, this step will allow you to discharge the extinguisher.

A- Aim the nozzle at the base of the fire, If aim at the flames, which is most frequently the temptation, the agent in the extinguisher will fly right through and will do no good,  You had to hit the fuel.

S- Squeeze the lever slowly, In this step depresses the button that releases the pressurized extinguishing agent in the extinguisher.

S- Sweep the spray from side to side over the fire,  Start using the extinguisher from a safe distance away, then move forward to the reduced flame, until the fire is completely out, but keep an eye,  on the area it may re-ignites.  

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Answer:

Bohr's model of hydrogen is based on the nonclassical assumption that electrons travel in specific shells, or orbits, around the nucleus.

Explanation:

hope this helps and have a great day

The correct answer is 14.8%.

The given reaction,

C_6H_12O_6 ----> 2CO₂ + 2C₂H₂OH

A key idea in chemistry is stoichiometry, which determines the quantity of reactants or products in a chemical reaction and aids in understanding different reactions and the proportions in which they might take place. A combination of two Greek terms is stoichiometry. Stoicheion, which denotes an element, and metron, which denotes a unit of measurement

mole= mass/mole mass

=90g/180g/mol

=0.5mol

According to stoichiometry

1 mol glucose = 2 mol ethanol

0.5 mol C_6H_12O_6 = 1 mole ethanol

mass of ethanol = 1 mole ×46 g/ mol

Theoretical yield = 46 g

percentage = actual yield / theoretical yield × 100

=6.8 g / 46 g × 100 = 14.78% =14.8%

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When drawing conclusions from the data in a scientific claim , the person making the claim should be trained in that field in which he or she is making claim.

Claim made by scientists in there research or theory is known as Scientific claim. It is based generally on evidences and systematic observation . These claims should be supported by proofs and pre existing theories so that this can be relied on.

But every scientific claim is not true and thus is non reliable because of faults and flaws made during the experiment  and investigation .

Therefore to make a claim reliable , the person making the claim should have abundance knowledge of it and have done sufficient background search of the topic on which he or she is making the claim. Also he or she should be trained in the field in which they are making the claim then only the claim can be trusted and the theories and conclusion can be made out of it.

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Chemical bonds that join the amino acids together to form polypeptide chains are peptide bonds. Chemical bonds are formed when two or more atoms, molecules, or ions come together to form a compound. Atoms in the resultant molecule are held together by these chemical bonds.

Bonds can be classified as ionic, covalent, or metallic in general. When a valence electron transfers from one atom to another to finish the outer electron shell chains, an ionic bond is created. Ionic bonds, covalent bonds, hydrogen bonds, and van der Waals interactions are the four categories of chemical bonds that are necessary for life.

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Taking into account definition of percent yield, 15 grams of HF are produced if 3.00 g of hydrogen react with excess fluorine with a 25 percent yield.

In first place, the balanced reaction is:

H₂ + F₂ → 2 HF

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 2 grams of H₂ form 40 grams of HF, 3 grams of H₂ form how much mass of HF?

mass of HF= (3 grams of H₂× 40 grams of HF)÷ 2 grams of H₂

mass of HF= 60 grams

Then, 3.00 g of hydrogen react with excess fluorine and it forms 60 grams of HF.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield=(actual yield÷ theorical yield)×100%

where the theoretical yield is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, you know:

Replacing in the definition of percent yields:

25%=(actual yield÷ 60 grams)×100%

Solving:

25%÷100%= actual yield÷ 60 grams

0.25= actual yield÷ 60 grams

0.25× 60 grams= actual yield

15 grams= actual yield

Finally, 15 grams of HF are produced if 3.00 g of hydrogen react with excess fluorine with a 25 percent yield.

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The percentage abundance of isotopes of gallium is 61.56% is Ga-70.92 & 38.44% is Ga-68.93.

Gallium (31Ga) is composed of two stable isotopes: gallium-69 and gallium-71. Gallium-67 and gallium-68 are the most commercially important radioisotopes.

Gallium-67 (half-life: 3.3 days) is a gamma-emitting isotope (the gamma ray emitted immediately after electron capture) that is used in standard nuclear medical imaging procedures known as gallium scans. It is most commonly used as the free ion, Ga3+. It is the gallium radioisotope with the longest half-life.

Gallium has two naturally occurring isotopes: Ga-69 (mass 68.9256 amu, natural abundance 60.11%), and Ga-71 (mass 70.9247 amu, natural abundance 39.89%).

Gallium's average atomic mass =[tex]\frac{68.9257 +70.9249}{2}[/tex]

=69.9253

Let x equal the percentage abundance of the first isotope.

by utilizing

AAM=[tex]\frac{W_{1}X_{1} * W_{2} X_{2} }{100}[/tex]

[tex]69.70 = \frac{70.925 *X +68.926 * (1-X)}{100}[/tex]

[tex]69.70 = 70.925X + 68.926 - 68.926 X[/tex]

x = 61.56%

61.56% is Ga-70.92. (100-61.56)

& 38.44% is Ga-68.93.

The percentage abundance of isotopes of gallium is 61.56% is Ga-70.92 & 38.44% is Ga-68.93.

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Although the valence electron structures of the atoms of each element in a vertical column are often the same, the number of energy levels in the atoms increases as the elements descend the column.

Because of their comparable chemical behavior, the vertical columns of the periodic table are referred to as groups or families. A family of elements' members share the same valence electron count and chemically similar characteristics.

Periods and groups are the names of the horizontal rows and vertical columns, respectively. Chemical characteristics of elements within the same group are comparable. Due to the fact that they have an equal number of outside

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Answer:

sight, taste, touch, hearing and smell

Explanation:

Anything detected with the five senses is considered a sensory perception or sensory experience

Our five senses are sight (vision), hearing (audition), taste (gustation), touch (tactile perception), and smell (olfaction). These senses allow us to perceive and interpret information from the external environment.

When stated as "detected with the five senses," which means gather information about the world around us through these sensory experiences.

For example:

1. Sight (Vision): We perceive visual information through our eyes, allowing us to see colors, shapes, and movements.

2. Hearing (Audition): We perceive auditory information through our ears, allowing us to hear sounds and distinguish between different tones and pitches.

3. Taste (Gustation): We perceive taste sensations through our taste buds on the tongue, allowing us to distinguish between sweet, sour, salty, bitter, and umami flavors.

4. Touch (Tactile Perception): We perceive tactile sensations through our skin, allowing us to feel textures, pressure, temperature, and pain.

5. Smell (Olfaction): We perceive smells through our olfactory system, located in our nose, allowing us to detect and identify various scents and odors.

All the sensory experiences , whether through sight, hearing, taste, touch, or smell, contribute to our understanding of the world and our surroundings.

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Answer:

Explanation:

All of the following are duties of United States citizens EXCEPT:

A.

understanding their rights

B.

taking education seriously

C.

understanding what it means to be an active citizen

D.

learning about and understanding foreign governments and laws

Please select the best answer from the choices provided

A

B

C

D

Answer:

The kilogram, meter, and second are the fundamental base units upon which the metric system is built, but seven units of measure are defined from which all the other units are derived: Kilogram: The kilogram (kg) is the base unit of mass. Meter or Metre: The meter (m) is the unit of length or distance.

Explanation:

The two main sets of English units were the Winchester Units, used from 1495 to 1587, as affirmed by King Henry VII, and the Exchequer Standards, in use from 1588 to 1825, as defined by Queen Elizabeth I.

The density of lead is 11.4 g/cm³. The mass of a lead ball with a radius of 0.50mm is  5.9714226 x 10⁻² g.

The density of a substance is defined as the mass of substance per unit of its volume. Density is represented by the symbol, ρ.

The formula for density is -

 Density (ρ) = mass (m)                    

                       volume (v)

Given :

Density of lead = 11.4 g/cm³

Radius of lead ball = 0.50 mm = 0.05 cm

Since,

         Vsphere = 4/3 π r³

                     v = 4 × 3.14 × (0.05)³

                           3

                     v = 4.18 x (1.25 x 10⁻³)

                     v = 5.225 x 10⁻³  

Since,

           Density =  mass  

                            volume

       11.4 g/cm³ =    mass  

                            5.225 x 10⁻³

              mass = 11.4 x (5.225 x 10⁻³)

              mass = 5.9565 x 10⁻² or 0.05955 g

So,  the mass of a lead ball with a radius of 0.50mm is  5.9565 x 10⁻² g

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It expected to assume tetrahedral in shape.

Tetrahedral molecules are those in which the central atom has four bonds and no lone pairs. The atoms bonded to the central atom are located at the four corners of a tetrahedron, and there are 109.5° angles between them.

A common example of a tetrahedral structure is methane, which contains four hydrogen atoms around the carbon atom. The nitrogen atom at the centre of the ammonium ion is surrounded by four hydrogen atoms.

The carbon atoms are organised tetrahedrally in a diamond. With a C-C-C bond angle of 109.5 degrees, each carbon atom is joined to four more carbon atoms at a distance of 1.544 x 10⁻¹⁰metres. It produces an endless network of atoms and has a robust, hard three-dimensional structure.

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The molecule of the sort ML₄ consists of four single bonds and no lone pairs.The structure is it expected to assume is  tetrahedral

What is meant by tetrahedral structure?

Tetrahedral may be a molecular shape that occurs when there are four bonds and no lone pairs in the molecule's central atom. The atoms bonded to the central atom are located at the four corners of a tetrahedron, with 109.5° angles between them.

What is a Molecule?

A molecule may be a particle made up of two or more atoms that are chemically bonded together; the number of atomic nuclei making up a molecule is a determinate number. for instance , HCl(g) may be a molecule made of one hydrogen atom bonded to one chlorine atom.

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When phosphate is added to ADP to form the energy-storing molecule ATP, this is often often known as phosphorylation and, since water is additionally produced, this reaction is additionally considered a condensation reaction.

What are phosphorylation and condensation?

Phosphorylation could also be a condensation reaction that is important for the functioning of sugars, lipids, and proteins and is critical when it involves regulating the function of enzymes. one among the simplest phosphorylation reactions in nature is the phosphorylation of glucose which is the first step in glycolysis.

What happens when a phosphate molecule is added to ADP?

When the cell has extra energy (gained from breaking down food that has been consumed or, within the case of plants, made via photosynthesis), it stores that energy by reattaching a free phosphate molecule to ADP, turning it back to ATP. The ATP molecule is simply like a rechargeable battery.

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The potency of acetylcholine after replacing the acetyl group with propionyl or butyrly group decreases.

Its is a organic chemical that function in the brain and body fofmany types of animal ,and humans also as neurotransmitter.

It act as a messenger , that plays a very important role in the central and peripheral nervous system.

The acetylcholine is important for autonomic body functions, muscle control and memory , learning and attention.

Lack of acetycholine cause no contraction in muscles.

Excess of acetylcholine causes cramps , muscular weakness blurry vision, diarrhea etc.

Propionyl or butyryl  is higher homologus group than acetyl , this is the reason the potency will decreases or reduces its activity.

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Sucrase is the enzyme in the given reaction.

Enzymes help proceed with chemical reactions faster in the body. They play a key role in digesting food, respiration, and other chemical processes happening in the body.

Sucrase is an enzyme that helps with digestion by the hydrolysis of sucrose into glucose and fructose. They are localized in the brush holder for the absorption of food. The body won't absorb sucrose in the absence of sucrase.

Sucrase is also known as invertase and it also occurs in plants for the hydrolysis of sucrose.

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Answer:

D.

Explanation:

The rms speed of the molecule is 200 m/s at a temperature of 300K. Then, the mass of the individual molecule is 3.11 ×10⁻²⁵ Kg.

Given,

The rms speed of the molecule (Vrms) = 200 m/s

The temperature of the molecule (T) = 300K

We have to find the mass (M) of individual molecules.

The expression for root mean square speed measures the speed of particles in a gas is given by:-

Vrms = √3KT/M

By squaring both sides we get,

(Vrms)² = 3KT/M

(200)² = 3 × 1.33 × 10 ⁻²³ × 300 / M

Or, M = 3.105 × 10⁻²⁵ Kg

Hence, the mass of the individual molecule is 3.105 × 10⁻²⁵ Kg.

The root mean square (R.M.S) speed V of the molecules of an ideal gas is given by the expression, v=sqrt(3RTM) and v=sqrt(3KTm) where R is universal gas constant, T is the absolute (Kelvin) temperature, m is the molar mass, K is Boltzmann's constant and M is the molecular mass.

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B) 2.72 * 10^13 oxygen atoms are there in phosphoric acid.

The most significant phosphorus oxygen acid, also known as orthophosphoric acid (H3PO4), is used to create phosphate salts for fertilizers. Additionally, it is utilized in the production of albumin derivatives, dental cement, sugar, and textile manufacturing. It is used in food goods as an acidic, fruity flavoring.

A less concentrated version of phosphoric acid is a colorless syrupy liquid, while pure phosphoric acid is a crystalline solid with a melting point of 42.35° C (or 108.2° F). While white phosphorus is used to create acid with a higher purity, phosphate rock is used to create crude acid. Three classes of salts are produced by phosphoric acid depending on whether one, two, or three hydrogen atoms are substituted.

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The reaction that demonstrates a chemical change is iron (Fe) reacting to water((H,O)) and oxygen(O) to form iron oxide(Fe2Og). That is option B.

A chemical change is defined as the change that occurs when two substances reacts or combines to form an entirely new product.

The following are the features that shows that a chemical change has taken place. They include:

When the above signs are seems there is every reason to accept the fact that a chemical change has occurred in the chemical reaction that took place.

From the chosen option, the reactants and product of the chemical reaction are:

Iron (Fe) + water (H2O) --> iron oxide(Fe2Og)

This reaction is a chemical reaction as the product formed leads to a colour change known as rust.

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An unknown substance has a density of 2.5g/ml. Density is a physical property because we can find it for a substance without changing the identity of the substance. The correct option is B.

Physical properties are those properties that can be seen by seeing the matter of the object. Density is a physical property. It does not depend upon the chemical composition of the object.

Thus, the correct option is B. Density is a physical property because we can find it for a substance without changing the identity of the substance.

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The required force is 280 N.

We must subtract our individual forces in order to calculate the net force.

In general, whenever forces act on an object in opposite directions-the net force is equal to the difference between the two forces.

To calculate the net force, one force is subtracted from the other. therefore, here

325 N is force 1 to the right.

45 N is force 2 to the left.

Force 1 - Force 2 is the net force.

net force= 325N - 45N

net force= 280 N

So the required force is 280 N.

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The net force of the runner would be 280 N.

Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!

Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"

h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w

The percent yield of reaction of tungsten (vi) oxide with excess hydrogen gas to produce metallic tungsten and 9.60 mL of water is 101.25%

The balanced chemical equation of reaction is -

          WO₃ + 3H₂ → W + 3H₂O

Given :

Mass of WO₃ = 43.9 g

Molar mass of WO₃ = 231.8 g/mol

Molar mass of H₂O = 18 g/mol

So,

Number of moles of WO₃ = Given mass

                                              Molar mass

                moles of WO₃ = 43.9 g         = 0.18 mol

                                           231.8 g/mol

Now, to calculate number of moles of H₂O, we use the balanced equation. From the equation,

1 mole of WO₃ reacts to give 3 moles of H₂O

So, 0.18 mole of WO₃ reacts to give 3 x 0.18 = 0.54 moles of H₂O

To calculate mass of H₂O,

Mass of H₂O = Moles x molar mass

                     = 0.54 mol x 18 g/mol

                     = 9.72 g

Therefore, the theoretical yield is = 9.72g

For actual yield,

 Actual mass = density x volume                             (density =mass/volume)

                       = 1.00 g/mL x 9.60 mL

                       = 9.6 g

Therefore, the actual yield is 9.6 g

Now, for percent yield of reaction,

        % yield =     actual yield     x 100

                         theoretical yield

                      = 9.72 x 100

                           9.6

                      = 101.25 %

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The absolute pressure in a compressed air tank is 180 kpa. pressure in psia  is 26.10 psia

The pressure of having no matter inside a space, or a perfect vacuum called absolute pressure. it indicates how much higher your process pressure is than that of a process in vacuum, so measurements are always positive. for calculate pressure

P=(180kPa)(1 psia/6.895 kPa) = 26.10 psia

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