Maria wants to determine which type of disinfectant kills the most bacteria.

Which of the following is the best way for Maria to determine this

Answer:

R=0·083 J/mol·K

Explanation:

Ideal gas equation is

where,

P is the pressure of the gas

V is the volume of the gas

n is the number of moles of the gas

R is ideal gas constant

T is the temperature of the gas in Kelvin

In case of given problem

Temperature of the gas = 273+2·00=275·00K

P=259,392·00×[tex]10^{-5}[/tex] atm

(259,392·00×[tex]10^{-5}[/tex] )×8·8 = 1×R×275·00

∴R=0·0830 J/mol·K

But according to the rules of significant figures the value of R must be with least precision of all the values of the other parameters from which the value of R is calculated

Here the least precision is in the volume as it contains only 2 significant digits

∴ Value of R must contain 2 significant digits

∴ R=0·083 J/mol·K

Answer:

P = 28.2 Kpa

Explanation:

Given data:

Volume = 35.5 L

Temperature = 223 K

Number of moles = 0.540 mol

R = 8.314 Kpa. L/mol.K

Pressure = ?

Solution:

PV = nRT

P = nRT / V

P = 0.540 mol . 8.314 Kpa. L/mol.K .223 K / 35.5 L

P = 1001.2 Kpa . L /35.5 L

P = 28.2 Kpa

Answer:c

Explanation:

Answer:

x = 5.9

Explanation:

Using Charles' Law, the new volume of a 2.5 L sample of gas at STP when the temperature is raised to 273°C (546 K), keeping pressure constant, is found to be 5.0 L.

The subject of this question is Chemistry, specifically related to gases and their behavior under different conditions of temperature and pressure. The question is asking for the new volume of a gas when its temperature is raised from the standard temperature and pressure (STP), which is 0°C or 273 K and 1.00 atm, to 273°C, given that the pressure remains constant.

To solve this, we use the Charles' Law, which states that, assuming the amount of gas remains the same and the pressure is constant, the volume of the gas is directly proportional to its temperature in Kelvins. Mathematically, Charles' Law is expressed as:

V1/T1 = V2/T2

Here, V1 is the original volume, T1 is the original temperature, V2 is the new volume, and T2 is the new temperature. Substituting in the given values:

V1 = 2.5 L (original volume)

T1 = 273 K (original temperature in Kelvins, which is the same as 0°C)

T2 = 273°C + 273 = 546 K (we convert the new temperature to Kelvins by adding 273)

The pressure remains constant, so the only variable that changes is temperature. To find the new volume (V2), the equation is rearranged to solve for V2:

V2 = (V1 \\times T2) / T1

After calculating, we get:

V2 = (2.5 L \\times 546 K) / 273 K

V2 = 5.0 L

Thus, when the temperature of the gas is increased to 273°C at constant pressure, the new volume of the gas will be 5.0 liters.

C)

C)

D)...... ..........

Answer:

Explanation:

First one is C. It is not using chemicals to break in half, instead she is physically cutting the apple herself. Therefore , she is physically cutting the apple. Not sure on number two sorry. Hope this helps!

~ HAZEL360

The ground state electron configuration of a neutral atom of titanium (atomic number 22) is represented as 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d², where electrons are filling up the energy levels and sublevels in sequence from lowest to highest according to the Aufbau Principle.

The ground state electron configuration of a neutral atom of titanium, which is a transition metal with an atomic number of 22, can be determined using the principle that electrons fill the lowest energy levels first. This principle is expressed in the Aufbau Principle.

Commonly, we start with hydrogen, which has the electron configuration of 1s¹. We progress with the filling of each electron in succeeding energy levels and sublevels until we get to the number of electrons equal to the atomic number of titanium, which is 22.

In this case, the ground state electron configuration of titanium will be as follows: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d².

This means that the innermost shell (n=1) has 2 electrons in the 's' sublevel, the next shell (n=2) has 2 electrons in the 's' sublevel and 6 in the 'p' sublevel, and so on.

Crucially, you can note that the last shell in the configuration is the third shell where we find 'd' electrons. The fourth shell fills with 's' electrons, and then the 'd' sublevel in the third shell begins to fill - this is a special feature of transition metals.

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Answer:

B

Explanation:

Answer:

Air is a mixture of carbon dioxide, hydrogen and oxygen so it's a MIXTURE and NOT a COMPOUND.

Final answer:

The statement is false as water is the compound essential for all forms of life, not air.

Explanation:

The statement 'Air, not water, is the compound of life' is false. Water is a compound made up of hydrogen and oxygen and is essential for all forms of life on Earth. Water's unique properties, such as its polarity and its ability to stabilize temperature, make it indispensable for living organisms. For instance, it participates in chemical reactions within cells, helps with temperature regulation, and is a solvent for nutrients. While air is also important, providing oxygen for respiration, it is not considered a compound. Moreover, water, not air, is the most abundant molecule in Earth's atmosphere.

Answer:

5

Explanation:

The full electronic configuration of the element is

1s²2s²2p63s²3p³

The total number of electrons = addition of the index

That is number of electrons = 2+2+6+2+3 = 15

Therefore the atomic number of the element is 15.

Name of element with atomic number 15 is Phosphorus with symbol P

Number of electrons in the atom of the element is 15.

Using KLMN configuration = 2:8:5

Therefore number of valence electrons is 5

I hope this was helpful, please mark as brainliest

The atom has 5 valence electrons.

The electron configuration provided indicates the arrangement of electrons in the atom's energy levels and sublevels. The last two energy levels are 3s and 3p. In this case, the 3s2 represents the filled s sublevel, and 3p3 represents the partially filled p sublevel. The valence electrons are those in the outermost energy level, so the atom in question has 5 valence electrons.

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Answer:

Scientific theory- a proven and confirmed explanation of a certain feature of the natural world, based on facts that have been repeatedly confirmed via observation and experiment.

Scientific law- statements that are created from repetitive experimenting and observations and that describe or predict a series of natural events.

Answer:

I believe the correct answer is notify his teacher and classmates.

Explanation:

If he were to pick up or gather the broken glass, he could cut himself. By notifying a teacher, the situation could be dealt with in a safe manner.

Answer:

it is b

Explanation:

Answer:

0.5583  g/L[/tex]

Explanation:

Since boron trifluoride ( B[tex]F_{3}[/tex] ) Is an ideal gas , we can apply IDEAL GAS EQUATION which is ,

PV  = nRT

Where ,

P - the pressure at which it is present (20 atm)

V - volume of the gas (needed)

n - number of moles of the gas taken (1 mol)

R - universal gas constant which is 8.314 [tex]JK^{-1} mol^{-1}[/tex]

T - temperature of the gas ( 273 + 20 = 298 K )

thus ,

[tex]20*V = 1*8.314*293\\V= 121.8001 L[/tex]

density ρ = [tex]\frac{mass}{volume}[/tex]

mass of  B[tex]F_{3}[/tex] is :

B : 11

F : 19

therefore , mass = 11 + [tex]3*19[/tex]

=68 g

density = [tex]\frac{68}{121.8001}  = 0.5583  g/L[/tex]

Boron has a very high melting point of 4,000 degrees Fahrenheit and a very low density of 2.37 grams per cubic centimeter.

To Calculate Density using the Density Formula.

The density calculation formula is p = m/V,

= 0.5583 g/L

An ideal gas, boron trifluoride (B) can be estimated by utilizing the ideal gas equation, which exists,

PV = nRT

Where, P stands for the pressure at which it exists.

V exists the gas's volume.

N exists the quantity of moles of gas consumed.

R exists the 8.314 universal gas constant.

T exist the gas's temperature (273 + 20 = 298 K).

If density = mass of B, then:

B : 11 and F : 19

Consequently, mass = 11 + = 68 g.

Boron has a very high melting point of 4,000 degrees Fahrenheit and a very low density of 2.37 grams per cubic centimeter.

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Answer:

B.Number of waves that pass a given point in a given time.

Answer:

B

Explanation:

At moderate elevation most of  ecosystem supportive abiotic factors are present.

Answer:

After 5th half life the remaining mass is 31.25 g.

Explanation:

Given data:

Total mass of carbon-14 = 1000 g

Mass remain after 5 half lives = ?

Solution:

At time zero = 1000 g

At first half life = 1000 g/2 = 500 g

At second half life =  500 g/ 2= 250 g

At third half life = 250 g/ 2 = 125 g

At 4th half life = 125 g/2 = 62.5 g

At 5th half life = 62.5 g/2 = 31.25 g

Thus after 5th half life the remaining mass is 31.25 g.

Metals are identified using precipitation, visible-evidenced redox reactions, and complexation reactions.

Various tests, such as the spark test, flame test, chip test, fracture test, file test, hammer test, and plain observation, can be used to identify metals.

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Qualitative analysis of metals involves various methods such as flame tests, colorimetry, and chelation titration to identify metals.

Qualitative analysis: In addition to precipitatiokn, other means of qualitative analysis used to identify metals include flame tests, colorimetry, and chelation titration. Flame tests involve heating a sample of the metal and observing the characteristic color of the flame. Colorimetry uses the absorption or transmission of light by the metal ions to determine their concentration. Chelation titration involves the formation of a complex between the metal ion and a chelating agent, which can be detected using indicators or spectrophotometry.

69.918 g

We are given;

We are supposed to determine the maximum theoretical yield of Iron from the blast furnace;

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Moles = Mass ÷ Molar mass

Molar mass of Fe₂O₃ = 159.69 g/mol

Therefore;

Moles of Fe₂O₃ = 100 g ÷ 159.69 g/mol

                          = 0.626 moles

From the equation;

1 mole of Fe₂O₃ reacts to produce 2 moles of Fe

Therefore;

Moles of Fe = Moles of Fe₂O₃ × 2

                    = 0.626 moles × 2

                    = 1.252 moles

Mass = Moles × molar mass

Molar mass of Fe = 55.845 g/mol

Therefore;

Mass of Fe = 1.252 moles × 55.845 g/mol

                  = 69.918 g

Therefore, the maximum theoretical mass of Iron metal obtained is 69.918 g

Final answer:

The maximum theoretical mass of iron from 100g of iron oxide can be calculated using stoichiometry, converted to moles, applied ratios from the chemical reaction, and then converted back to grams to get the iron mass.

Explanation:

The maximum theoretical mass of iron that can be made from 100g of iron oxide can be calculated using stoichiometry based on the balanced chemical equation for the reduction of iron oxide with carbon:

2Fe2O3 + 3C → 4Fe + 3CO2

To perform this calculation, you need the molar masses of iron (Fe) and iron oxide (Fe2O3). One mole of iron oxide has a mass of approximately 159.69 g/mol, and one mole of iron has a mass of approximately 55.85 g/mol. Using the equation:

Apply the stoichiometry to calculate the moles of Fe that can be produced.

Convert the moles of Fe back to grams to get the mass of iron.

The stoichiometry shows that from one mole of Fe2O3, you get two moles of iron. Therefore, from 100 g of iron oxide, you can theoretically produce:

100g Fe2O3
-------------  x 2 mol Fe x 55.85 g/mol Fe
159.69 g/mol Fe2O3

This will give the maximum theoretical mass of iron that can be produced from 100g of iron oxide. Keep in mind that the actual yield may be lower due to practical losses and inefficiencies in the reaction process in the blast furnace.

Answer:true

Explanation:

it is c. ionic compound just because it says ionic. can't be a crystal since there's no links to an ionic bond connected to crystals (and if it were it'd depend on the elements and the thingy majig itself right) and a covalent bond is an entirely different bond which isn't related to ionic. hope this helped, and i hope you have a good day too! :D

Transistors

A(n) transistor can either amplify an electronic signal or switch a current on and off.

Explanation:

The main component of a transistor is a semiconductor. A transistor has at least three terminals. Voltage application through a pair of terminals affects the voltage of the other terminal. In addition, the controlling voltage can be lower than the controlled voltage, hence the amplification (gain) property of transistors. This same principle can be applied to switch on and off larger currents. If a controlling current surpasses a particular saturation point –specific to that transistor-, then it switches on the larger currents (controlled currents).

Transistors have much application in the world from being significant components in the electric circuits for speakers, hearing aids, calculators, computers, and most other digital gadgets.

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Answer:

The word equation is:  

[tex]\text { hydrogen peroxide } \rightarrow \text { oxygen gas + water }[/tex]

 This reaction happens when there is the decomposition of hydrogen peroxide into oxygen and water. Thus, the equation would be  

[tex]H_{2} O_{2} \rightarrow O_{2}+H_{2} O[/tex]

Balancing the equation requires to have the same number of atoms of each element on both the side. To balance this equation we need to add 2 water ([tex]H_2O[/tex]) molecules  and 2  hydrogen peroxide ([tex]H_2O_2[/tex]) molecules  . As we know, oxygen is naturally diatomic. Thus, the balancing equation would be:

[tex]2 H_{2} O_{2} \rightarrow O_{2}+2 H_{2} O[/tex]

Answer:

13 moles of KClO₃ will decompose to gives 13 moles of KCl.

Explanation:

Given data:

Moles of potassium chloride = 13.0 mol

Moles of KClO₃ = ?

Solution:

Chemical equation:

2KClO₃ → 2KCl + 3O₂

Now we will compare the moles of KCl  with KClO₃.

                     KCl         :           KClO₃

                      2            :             2

                      13           :            13

So 13 moles of KClO₃ will decompose to gives 13 moles of KCl.

Answer:

[tex]E=2052.8 kJ[/tex]

Explanation:

The energy absorbed by the water is the energy it requires to evaporate. So:

[tex] Heat of .vap= 40.65 kJ/mol[/tex]

The moles of water:

[tex]n_w=m_w *\frac{1000g}{2.2lbs}*\frac{1}{M}[/tex]

M is the water molecular weight

[tex]n_w=2 lbs *\frac{1000g}{2.2lbs}*\frac{1}{18g/mol}[/tex]

[tex]n_w=50.5mol[/tex]

The energy absorbed:

[tex]E=n_w*Heat of vap.=50.5mol *40.65 kJ/mol[/tex]

[tex]E=2052.8 kJ[/tex]

Answer:

The correct annswer is D)31p has 16 neutrons whereas 32p has 17 neutrons

Explanation:

An isotope is an atom of an element with the same atomic number (Z) but a different mass number (A). That is, one isotope differs from another by the number of neutrons

Z = number of protons

A = number of protons + number of neutrons.

For the phosphorus example (P), whose Z = 15:

31P -> A = 31 = number of protons + number of neutrons

Z = 15 = number of protons

A = 31 = number of protons + number of neutrons ->

31 = 15 + number of neutrons -> number of neutrons = 31-15 = 16

In the case of 32P:

A = 32 = number of protons + number of neutrons

32 = 15 + number of neutrons -> number of neutrons = 32-15 = 17

Answer:

D) 31p has 16 neutrons whereas 32p has 17

Explanation:

Apex Gang

Answer:

D. 182

Explanation:

right on e2020

Answer:

182 grams of oxygen gas must react to form 3.80 mol of aluminum oxide.

Explanation:

[tex]4Al + 3O_2\rightarrow 2Al_2O_3[/tex]

Moles of aluminum oxide = 3.80 mole

According to reaction, 2 moles of aluminum oxide is obtained from 3 moles of oxygen gas.

Then 3.80 moles of aluminum oxide will be obtained from:

[tex]\frac{3}{2}\times 3.80 mol=5.7 mol[/tex] of oxygen gas.

Mass of 3.80 moles of oxygen = 5.7 mol × 32 g/mol = 182.4 g ≈ 182 g

182 grams of oxygen gas must react to form 3.80 mol of aluminum oxide.

Answer:

i added this table for some help

Explanation:

here are some examples

metals:They are hard and shiny, strong, and easy to shape. They are used for many industrial purposes. This group includes iron, gold, silver, chromium, nickel, and copper, some of which are also noble metals.

non-metals:a chemical element (as boron, carbon, or nitrogen) that lacks the characteristics of a metal and that is able to form anions, acidic oxides, acids, and stable compounds with hydrogen.

metalloids:Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor. Metalloids have mixed properties which are difficult to characterize.

The sections of the periodic table are

Metals - are present at the center of the periodic table.

Non-metals - They are present on the right side of the periodic table.

Metalloids - They are present on the left side of the periodic table.

Metals are the elements which are present in the center of the periodic table. Metals are malleable, soft, and ductile, and they're used for causing many other matters.

Metals - They serve a variety of industrial functions. Iron, gold, silver, chromium, nickel, copper, and several other metals in this category are also noble metals.

Non-metals - Chemical elements that lack the properties of metals but may nevertheless produce anions, acidic oxides, acids, and stable compounds with hydrogen are referred to as non-metals. Examples include boron, carbon, and nitrogen.

Metalloids: Visually perceptible characteristics such as color, luster, melting temperature, freezing point, hardness, density, and odor are considered physical characteristics. Metalloids have complex features that make them challenging to categorize.

Thus, the position of metals, non-metal, and metalloids are given s the picture below.

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Answer:

i believe its A

Explanation:

Answer: reflected, clouds, greenhouse effect.

Explanation:

  Sunlight can be absorbed, reflected , or scattered before it reaches Earth’s surface. About 30 percent of sunlight hits Earth directly, and 22 percent is filtered through clouds . Dust particles scatter short wavelengths, which causes the sky to appear blue. Earth radiates heat into the atmosphere, which traps the heat in gases, causing the greenhouse effect.

According to the context, the missing words to correctly complete the paragraph are the following:

Sunlight can be reflected or scattered before it reaches Earth's surface. About 30 percent of sunlight hits Earth directly, and 22 percent is filtered through clouds. Dust particles scatter short wavelengths, which causes the sky to appear blue. Earth radiates heat into the atmosphere, which traps the heat in gases, causing the greenhouse effect.

The Sun is the main source of energy for all the processes that occur in the earth - atmosphere - ocean system.

Sunlight passing through the atmosphere undergoes a weakening process due to scattering (due to aerosols), reflection by clouds and absorption by gas molecules and suspended particles.

Consequently, gases in the atmosphere that absorb infrared radiation from the Earth or outgoing radiation are known as greenhouse gases.

Therefore, we can conclude that sunlight passing through the atmosphere undergoes a weakening process due to scattering, reflection by clouds and absorption.

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Answer:

Heat flows from the reactor to the water

Explanation:

The thermal energy mentioned in the description is another way to say heat. The energy that is produced by the nuclear reactions leaves the reactor and enters the water, warming it.

The passage does not say that heat flows in the form of electricity, but rather that the turbines turned by the steam produce electricity.

The passage does not say that the steam produces the heat, but rather that the boiling of the water (caused by the heat) produces steam.

Answer:

B

Explanation:

Answer:

Chemical formula is CoCl. 3H₂O

Explanation:

Data Given

Percentage of water = 45.43%

Percentage of CoCl. = 54.57%

Chemical Formula of the hydrates = ?

Solution:

First, find the mass of each of the part ( CoCl and water) in 100 g of the Compound.

Mass of CoCl = 28 + 35.5

Mass of CoCl = 63.5

Mass of H₂O = 18 g

Now find how many moles are there for each element in 100 g of compound

So,

The percentage will be count in grams for 100g in compound

Find the moles in total compounds

Formula Used for CoCl

mole of CoCl = mass of CoCl / Molar mass of CoCl

mole of CoCl = mole of  54.57 g / 63.5 g/mol

mole of CoCl = 0.859

Formula Used for H₂O

mole of H₂O = mass of H₂O/ Molar mass ofH₂O

mole of H₂O = 45.43 g / 18 g/mol

mole of  H₂O = 2.539

Now

To find the Chemical formula

Divide each one by the smallest number of moles

CoCl = 0.859 / 0.859

CoCl = 1

For H₂O

H₂O = 2.539  / 0.859

H₂O = 3

Multiply the mole fraction to a number to get the whole number.

CoCl =  1

H₂O  = 3

So,  

The Chemical formula is CoCl. 3H₂O

Final answer:

The chemical formula of the hydrate with 45.43% water and 54.57% CoCl is cobalt (II) chloride hexahydrate (CoCl₂·6H₂O).

Explanation:

The student is tasked with finding the chemical formula and name for a hydrate that is 45.43% water and 54.57% CoCl. Working with a sample size of 100 g is a common approach to simplify the calculations, as it allows us to directly convert percentage to mass.

First, calculate the mass of water in the sample by multiplying the total mass of the compound (100 g) by the percentage of water (0.4543), which equals 45.43 g. Then, calculate the mass of CoCl in the sample in the same way, leading to 54.57 g of CoCl.

Next, convert these masses to moles by using the molar mass of H₂O (approximately 18.015 g/mol) and the molar mass of CoCl₂ (approximately 129.839 g/mol). This results in about 2.522 moles of H₂O and about 0.420 moles of CoCl₂.

The mole ratio of water to CoCl₂ is then found by dividing the moles of each component by the smallest number of moles, yielding approximately 6 moles of H₂O for every mole of CoCl₂. This ratio suggests the chemical formula of the hydrate is CoCl₂·6H₂O, which means the hydrate is cobalt (II) chloride hexahydrate.

Answer:

c = 0.25 j/g.°C

Explanation:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Given data:

Mass of metal = 50.0 g

Heat needed = 314 j

Initial temperature = 25°C

Final temperature = 50 °C

Specific heat = ?

Solution:

ΔT  = 50 °C - 25°C = 25°C

Q = m.c. ΔT

c = Q / m. ΔT

c = 314 j /  50.0 g . 25°C

c = 314 j / 1250 g. °C

c = 0.25 j/g.°C

Final answer:

The specific heat of the metallic element is calculated using the formula q = m x c x ΔT and for the provided values, it is found to be 0.2512 J/g°C.

Explanation:

To calculate the specific heat of a metallic element, we use the formula q = m × c × ΔT, where q is the heat energy transferred, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature. Given 50.0 g of the metal, 314 joules of heat, and a temperature change from 25°C to 50°C, we can rearrange the formula to solve for c: c = q / (m × ΔT).

The change in temperature (ΔT) is 50°C - 25°C = 25°C. Thus, the specific heat (c) can be calculated as follows:

c = 314 J / (50.0 g × 25°C)
= 314 J / (1250 g°C)
= 0.2512 J/g°C

Therefore, the specific heat of the metallic element is 0.2512 J/g°C.