please answer holy its been an hour

Answer:

378.196

Explanation:

Multiply the length value by 1.609.

235 miles = 378.196 kilometers

Answer:

378.196 Kilometers

Explanation:

For an approximate result, multiply the length value by 1.609.

235*1.609 = about 378.2

4.80 grams of oxygen will be release.

When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:

2KClO3(s) → 2KCl(s)+ 3O2(g)

mass of potassium chlorate   = 12.25g

mole of KClO3 = 12.25/122.5 = 0.1 mol

2 mole KClO3 (consumed) = 3 mole O2 (produced)

1 mole KClO3 = 3/2 mole O2

0.1 mole KClO3 = 0.1*1.5 mole O2

                          = 0.15 mole O2

mass of O2 = 0.15 * 32 = 4.80 grams

4.80 grams of oxygen will be release.

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If the density of the object is 1.65 g/mL. The object's weight in pounds m = 483.32 pounds.

The density can be defined as the mass per unit volume which can be described it is the ratio between mass and volume.

Density is a measurement of matter, where it determine how tightly the matter is bond together, discovered by the Greek scientist Archimedes.

To calculate the density of an object, Density = Mass/Volume

The density of the object is 1.65 g/mL, Volume of the water is 35.1 gallons

1 gallon = 3785.41 mL

35.1 gallons = 132868 mL

1 pound = 453.592 grams

So, 219232.2 grams = 483.32 pounds weight.

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1. The empirical formula of the weak acid is H₂PO₃

2. The molecular formula of the weak acid is H₄P₂O₆

The empirical formula of the compound can be obtained as follow:

Divide by their molar mass

H = 0.0220 / 1 = 0.022

P = 0.3374 / 31 = 0.01

O = 0.5227 / 16 = 0.03

Divide by the smallest

H = 0.022 / 0.01 = 2

P = 0.01 / 0.01 = 1

O = 0.03 / 0.01 = 3

Thus, the empirical formula of the compound is H₂PO₃

Molecular formula = empirical × n = mass number

[H₂PO₃]n = 162

[(1×2) + 31 + (16×3)]n = 162

81n = 162

n = 162 / 81

n = 2

Molecular formula = [H₂PO₃]n

Molecular formula = [H₂PO₃]₂

Molecular formula = H₄P₂O₆

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Light travels as a "wave" and interacts with matter as a "particle".

Electromagnetic radiation that the human eye can detect as light. From radio waves with wavelengths measured in metres to gamma rays with wavelengths shorter than roughly 1 1011 metres, electromagnetic radiation occurs throughout a very broad range of wavelengths. The wavelengths of light that are visible to humans fall into a very small range within that wide spectrum, ranging from about 700 nanometers (nm; billionths of a metre) for the red light to roughly 400 nm for violet light.

Infrared and ultraviolet are two spectral bands that are close to the visible band and are frequently referred to as light as well. A fundamental physics constant, the speed of light in a vacuum is currently accepted to be 299,792,458 metres per second.

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The rock would weigh 2.89 grams per milliliter.

It is the mass of anything or body per unit volume of that specific object or body.

Equals volume / mass

A graduated cylinder has a mass of 50g when empty, as stated in the problem. The graduated cylinder has a mass of 120g after 30 mL of water have been added.

The rock weighs 250 grams, or 130 grams.

the rock's volume is equal to 75 milliliters minus 30 milliliters, or 45 milliliters.

Mass of the rock divided by volume equals 2.89 grams per milliliter, which is the density of the rock.

As a result, the rock has a density of 2.89 grams per milliliter.

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Answer:

Fn = m x g

Fn = normal force

m = mass of the stone

g = gravitational force acting on the stone.

therefore, fn=m x g = 10kg x 9.8m/s2 = 98 kgm/s2 or 98 N. Which is the same as 098 N.

Explanation:

A stone with a mass of 10 kg sits on the ground. The normal force acting on the stone, keeping it at rest, is 98 N. The correct option is D.

A force is a power that changes the position of an object. This results in the action or movement of any object. Force is calculated in Newton. The force can be calculated by multiplying the mass by acceleration.

Given, the mass of the stone is 10 kg

The gravitational force act at the rate of 9.8 m/s²

The formula is

Force  = mass x gravitational rate

Fn = normal force

m = mass of the stone

g = gravitational force acting on the stone

So, fn = m x g

10kg x 9.8 m/s²

98 kg m/s²or 98 N

Therefore, the normal force acting on the stone, keeping it at rest, is 98 N. The correct option is D.

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Answer:

The correct answer is 119.

Explanation:

We are given the bond length of XY is 212.

The covalent radius of Y = 93.

Now this means that the bond length(R) is sum of the radio of X and Y Atom.

So, R(XY)=r(X)+r(Y)

212 = r(X)+93

r(X)= 119.

Therefore, the covalent radius of X is 119.

I hope this helps, have a good day! :D

Bond length is the distance between two bonded atoms. The covalent radius of X in XY molecule with bond length 212 and Y with a covalent radius of 93, is 119.

Covalent radius is the measure of the atomic size bonded with another atom through covalent bond. Covalent bonds are formed between non-metals with comparable electronegativities.

Bond length of molecule is the distance between the two bonded atom. Mathematically bond length of a covalent compound is the sum of covalent radius of the two bonded atoms.

The bond length of the molecule XY is given as 212 and the covalent radius of Y atom is 93. The bond length 212 is the sum of covalent radius of Y and covalent radius of X.

Covalent radius of X =  212 - 93 = 119.

Therefore, covalent radius of X atom in the XY molecule with bond length 212 and Y atom with covalent radius of 93 is 119 thus, option a is correct.

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The lab procedure

The 150 mL beaker's contents should be emptied into the sink, followed by a thorough water rinse of the beaker and temperature probe sodium . Add 20 g of ice to the beaker after weighing it.

sufficient water to make the combined weight match the combined weight of the ice and water consumed above. Put the thermometer in the slush, press the green button, and agitate the mixture.

For two minutes, slush. sodium  Stir the slush while adding the 1.0 g of salt chloride. five minutes Simply press the red button. After saving the data, select Store Latest Run from the list.

The menu for experiments print the graph with both the sodium chloride and urea plots visible at once. sodium  Which plot corresponds to which solid should be noted on the printout.

The 150 mL beaker's contents should be emptied into the sink, followed by a thorough water rinse of the beaker and temperature sodium .

Simply select Show Data Set from the Data menu, followed by the Run # you want to display, to examine one of your earlier plots. It is possible to display multiple pieces of data at once.

The Latest Run is the most recent Run, and the Runs are numbered consecutively in the order in which they were acquired. To display the chosen plot or plots, just use the commands Hide Data Set and Show Data Set. The plot display settings (such as axes scaling, etc.) may need to be changed.

Display one or both students' temperature charts using the y-axis label, as desired. The Data menu also includes options for deleting individual data sets.

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Answer:

Explanation:

A) The thermal energy is spread out by the surrounding air would be the right answer  

hope you get it right :)

A protein is composed of a combination of amino acids.

A protein is composed of a combination of amino acids. The amino acids join together in a peptide bond. A number of peptide bonds give polypeptides which are the building blocks for proteins.

Now, we can see from the image that the polypeptide bond occurs between the carboxylic group of the glycine and the amine group of the alanine.

This leads to a loss of water molecule and a subsequent formation of the amide bond by condensation.

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There are eight moles of oxygen atoms  in 1 mole of [tex]Mn_{9}(ClO_{4}) _{2}[/tex].

We know that a compound is composed of atoms. The atoms that make up the molecule are chemically combined. It is usual that the number of atoms in the compound would correspond with the chemical formula.

Now we have the compound  [tex]Mn_{9}(ClO_{4}) _{2}[/tex]. In one mole of the compound we have;

Thus, there are eight moles of oxygen atoms  in 1 mole of [tex]Mn_{9}(ClO_{4}) _{2}[/tex].

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Increases in sewage waste were responsible for decreasing oxygen levels in the lake

Humans does have the impact on the environment in several ways. Common effects includes lowered water quality, elevated pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.

As global temperatures increasing , weather patterns on earth will dangererously change. While some areas will have longer growing seasons, others will become drought wastelands as water will decrease in vast areas, turning once floral regions into deserts. The elevation will impact weather patterns, provoking more intense hurricanes in both size and frequency, as well as intensifying and prolonging droughts and heat waves. But air pollution not only  just effect the environment . The evidence is increasing that poor air quality and rising temperatures are ruining delicate ecosystems, even led to increased asthma and cancer rates in humans.

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The correct answer is Test the hypothesis with an experiment.

The key goal of 4th step is to gather information and facts to test our idea.

Therefore, Rene is on the 4th step of scientific method.

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Answer: 94,608,000 seconds

Explanation:

365 days/1 yr=365

24 hours/1 day=24

60 min/1 hour=60

60 sec/1 min=60

365*24*60*60=

8760*3600=31536000 seconds in 1 year.

31536000*3=94608000 seconds

It cost $35.57 to drive the school bus for 94.00 miles.

Given:

Distance to drive (D) = 94.00 miles

Miles per gallon (MPG) = 6.500 miles/gallon

Cost of gas (C) = $2.459/gallon

Step 1: Calculate the amount of gas required for the trip.

Gas consumed = Distance / Miles per gallon

                          = 94.00 miles / 6.500 miles/gallon

                          = 14.4615 gallons

Step 2: Calculate the cost of gas for the trip.

Cost of gas = Gas consumed * Cost per gallon

                    = 14.4615 gallons * $2.459/gallon

                    = $35.57

Therefore, it will cost $35.57.

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The value of the rate constant at 820.0 K is 0.2 s^-1

Applying the Arrhenius equation, which is...

k = Ae-Ea/RT

Applying the formula, we get

lnk2 = lnk1 - (Ea/R)(1/T2 - 1/T1)

Applying the values, we get

ln k2 = ln 6.1x10^-8 - (2.62x10^3/8.314)(1/820 - 1/600)

Calculating the value, we get...

ln k2 = -0.31

Taking power e, we get

k2 = 0.2 s^-1

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The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer: true

Explanation:

The balanced redox reaction between acidified potassium and iron two chloride is given as ,

5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] ++ 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]

The reaction is spontaneous

Place these numbers as coefficients in front of the formulas containing those atoms.

[tex]Fe^{+2}[/tex] +  [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]

Balance all remaining atoms other than H and O

[tex]Fe^{+2}[/tex] +  [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]

Balance O.

Add enough H2O molecules to the deficient side to balance O.

We have 4O atoms on the left, so we need 4H2O

on the right.

5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] + 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]

The reaction is spontaneous when the value of E ° for the reaction is positive .

E ° for  [tex]MnO_{4} ^{- }[/tex]/   [tex]Mn^{+2 }[/tex] = 1.74 V

E ° = [tex]Fe^{+3}[/tex]/ [tex]Fe^{+2}[/tex] = 0.75 V

E ° for reaction = 1.74 V -  0.75 V = 0.99 V

Hence , E ° for reaction is positive .

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Gallium is the element that belongs to the group 3 and the fourth period. Ga is symbol of Gallium.

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The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is  1.29 kg

Humid air's density can be calculated by treating it as a mixture of ideal gases. The vapour pressure is the partial pressure of water vapour in this case. In the temperature range of 10 °C to 50 °C, the density calculation error is less than 0.2% using this method.

given that

Density =mass/ volume

1.29grams/ liter =[tex]\frac{mass}{m^{3} }[/tex]

1 liter = 0.001 [tex]m^{3}[/tex]   and 1 kilogram = 0.001grams

0.00129 kg/[tex]m^{3}[/tex] = mass / 0.001 [tex]m^{3}[/tex]

mass =0.00129 kg/[tex]m^{3}[/tex] /0.001 [tex]m^{3}[/tex]

which means,

mass= 1.29 kg

The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg

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When the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.

Electron transition can be defined as when an atoms or molecules absorbs radiation there electron get excited and jump from lower energy level to higher energy level and when an atom or molecule emit radiations energy it come back to its original place i.e. to the lower energy state.

Electron transition is based on Franck-Codon principle.

According to this principle electron transition occur without changes in position of there nuclei in the molecular entity and its environment.

Thus, when the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.

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To prepare 2.00 L of 0.250 M NaOH from solid NaOH, dissolve 20 g of NaOH in 2.00 L of water to form 0.250 M NaOH solution.

A stock solution is a solution with high concentration of any particular solute and it is used for obtaining moderate quantities of solute using small volumes.

Sodium hydroxide is a strong electrolyte with the molecular formula NaOH. Sodium hydroxide completely dissociates in aqueous solution to produce Na⁺ and OH⁻ ions. Hence, sodium hydroxide is considered to be a strong base. Sodium hydroxide, also called caustic soda, is highly hygroscopic in nature.

Firstly, we will prepare a stock solution, by placing n grams of NaOH in a liter volumetric flask. Then add 100 mL dilute water and make up the volume of solution to 1 liter.

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Answer:

Global warming potential (GWP) is the heat absorbed by any greenhouse gas in the atmosphere, as a multiple of the heat that would be absorbed by the same mass of carbon dioxide (CO 2).

Density of copper is 8.92 g/cm3.

The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol(p), although Latin letter D may also be used.

Given:

weight of copper = 12.11 g

Volume =  2.13 cm * 0.79 cm * 1.14 cm

            = 1.918 cm3

As we know that ,

Density = mass / volume

  d = m/v

 d  = 17.11 / 1.918

density = 8.92 g/cm3

Density of copper is 8.92 g/cm3.

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19 protons, 20 neutrons and 18 electrons.

The protons are determined by the atomic number (19).

therefore, number of proton = 19

The protons and neutrons together make up the atomic mass.

P + N = 39

19 + N = 39

number of neutrons = 39 - 19 = 20

A neutral atom has an equal number of protons and electrons. The negative charge is the same as the positive charge. The number of electrons represents the negative charge. The charge of this ion is +1. Therefore, find the negative charge.

= -19 + 1 = -18

therefore, number of electrons are 18.

Thus, no. of proton = 19

no. of neutrons = 20

no. of electrons = 18

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Answer: theoretical scientist

Explanation: