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Which element has the largest atomic radius?

Answers options are in the photo attached...

Answer:

Explanation:

The Octane rating is the % Octane in the grade that you are buying. In the United States, the octane rating of the cheapest gas is around 85%. In Canada, it is about 87% which in the states is the mid grade.

As soon as you take out the nozzle from its container, you have to press a large colored button to pick the octane rating. The button is so large and the writing is so limited, that you cannot miss the grade. Usually they are put together on the pump like this

87  89  91

I've given you the Canadian numbers; I'm not sure what they are in the US, but the numbers I've used are pretty close.

Answer:

Deposition

Explanation:

Answer:

Deposition...

Explanation:

Deposition is a process in which the water, ice and wind for layers of sediments when the fluid flow loses it's kinetic energy. After losing energy, the flow of soil in restricted and a layer over layer of soil is formed by deposition called sediments.

Answer:

4.88 x 10²⁴atoms

Explanation:

Given parameters:

Number of moles of oxygen = 8.1moles

Problem:

To find the number of atoms in 8.1moles of oxygen.

Method in solving the problem:

We know that a mole of a substance contains Avogadro’s number of particles which is 6.02 x 10²³

The particles can be molecules, atoms, etc.

Solution:

From the concept of mole,

Number of atoms =

number of moles x 6.02 x 10²³

Number of atoms = 8.1 x 6.02 x 10²³

Number of

atoms of oxygen = 48.8 x 10²³ atoms

= 4.88 x 10²⁴atoms

Answer:

The statement which defines activation energy is that it is the difference between reactant energy and maximum energy.J

Explanation:

A reaction that does not have activation energy will not take place at all.

Answer:

c

Explanation:

Answer:

31.7 °C

Explanation:

Charles law states that for volume of a gas is directly proportional to the absolute temperature for a fixed amount of gas at constant pressure

we can use the following equation

V1/T1 = V2/T2

where V1 is volume and T1 is temperature at first instance

V2 is volume and T2 is temperature at second instance

temperature should be in kelvin scale

T1 - 0 °C + 273 = 273 K

substituting the values in the equation

22.4 L / 273 K = 25.0 L / T2

T2 = 304.7 K

temperature in celcius is - 304.7 K - 273 = 31.7 °C

the gas must be 31.7 °C to reach a volume of 25.0 L

Answer & Explanation:

Similarities:

Difference:

Answer:

there are 9.9957 mol O2 in 340 g H2O2

Explanation:

reaction:

⇒ mol H2O2 = 340 g H2O2 * ( mol H2O2 / 34.0147 g H2O2 ) = 9.9957 mol

⇒ mol O2 = 9.9957 mol H2O2 * ( mol O2 / mol H2O2 ) = 9.9957 mol

Answer:

0.448 atm

Explanation:

we can use the ideal gas law equation to find the pressure of nitrogen gas

PV = nRT

where

P - pressure

V - volume

n - number of moles of gas

R - universal gas constant - 0.08206 L.atm/mol.K

T- temperature in kelvin -   -25.0 °C + 273 = 248 K

substituting the values in the equation

P x 15.0 L = 0.33 mol x 0.08206 L.atm/mol.K x 248 K

P = 0.448 atm

the pressure of gas is 0.448 atm

The study of chemicals and bonds is called chemistry. According to the law of thermodynamics, the temperature is the move from the high system to the low system.

The correct answer is 0.448 atm.

The formula used to solve the question is as follows:-

where,

Placing all the values in the equation.

[tex]P * 15.0 L = 0.33 mol * 0.08206 * 248 K P = 0.448 atm [/tex]

Hence, the pressure of a gas is 0.448 atm

For more information about the ideal gas law, refer to the link:-

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Answer: silicate

Explanation:

Answer:

Silicates

Explanation:

About 90 percent of the earth's crust is composed from silicate class of minerals. They are the various compounds of silicon and other chemical elements. Quartz and feldspar are the two most common types of silicate types that are found in Earth’s crust. Mica and olivine, which are the lesser concentrates of silicates are also found abundantly in the earth's crust.

Answer:

5.66 %.

Explanation:

mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.

mass % = (mass of solute/mass of solution) x 100.

mass of potassium nitrite = 30.0 g,

mass of the solution = mass of water + mass of potassium nitrite = 500.0 g + 30.0 g = 530.0 g.

∴ mass % = (mass of solute/mass of solution) x 100 = (30.0 g/530.0 g) x 100 = 5.66 %.

Answer: b. Clear cutting

Explanation:

Clear cutting is the correct option. Clear cutting involves the clearing up of entire vegetation cover of the region or cutting up of trees. This will lead to loss of canopy cover from a region. This will cause loss of biodiversity of a region as the animals, birds and insects will loose their habitat. Such faunal species may translocate to new region, decrease in number or may extinct.

Answer:

It is clear cutting

Explanation:

Clearcutting, clearfelling or clearcut logging is a forestry/logging practice in which most or all trees in an area are uniformly cut down.Clearcutting has been a controversial subject because of its environmental impact. While those who favour this method argue that it allows regenerating trees to have more access to sunlight while it reduces the risk of forest fires in some high-risk areas, opponents point out that in many cases, mass tree removal has caused soil erosion and the destruction of natural habitats for some animals.

Answer:c a mutation

Explanation:

Final answer:

In sexual reproduction, a new genetic variation in offspring that did not come from either parent is called a mutation. Mutations are a key source of genetic diversity and contribute to the evolution of new characteristics within a population.  So the correct option is C.

Explanation:

In sexual reproduction, when an offspring exhibits a new genetic variation not found in either parent, this is known as a mutation. Mutations are changes in DNA that serve as the ultimate source of new alleles or new genetic variation within a population. This genetic diversity is essential for the evolution of species, as it allows for adaptations to changing environments and the development of new traits.

Harmless mutations and sexual recombination play a crucial role in the evolution of new characteristics by contributing to genetic diversity. While sexual reproduction can introduce unique combinations of existing genes, it is through mutations that entirely new genetic variations can arise, potentially influencing an organism's phenotype—the observable characteristics of an individual.

Answer:

The right answer is V = 17.2 mL

Explanation:

No. of moles = C * V

where,

C is the concentration in morality and

V is the volume in liter

so you can calculate the volume using:

V = (No. of moles / C) = (0.0131 mol / 0.763 mol/L)

V = 0.0172 L

 V = 0.0172 L * (1000 mL / 1 L)

  V = 17.2 mL

So, the right answer is V = 17.2 mL

Answer:

Mg --> Mg²⁺ + 2e

Explanation:

Redox reactions consists of both reduction and oxidation reactions.

one species gets oxidised and other species gets reduced, both reactions happen simultaneously giving rise to a redox reaction.

Oxidation reactions could be either loss of electrons or gain of oxygen.

in oxidation the oxidation number of the species will increase

reduction on the other hand is either gain of electrons or gain of hydrogen.

in reduction the oxidation number of the species will reduce

in this reaction the oxidation half reaction is

Mg --> Mg²⁺ + 2e

Mg is losing electrons therefore its being oxidised

Answer:

[He]: 2s² 2p⁵.

[Ne]: 3s².

[Ar]: 4s² 3d¹⁰ 4p².

[Kr]: 5s² 4d¹⁰ 5p⁵.

[Xe]: 6s² 4f¹⁴ 5d¹⁰ 6p².

Explanation:

He contains 2 electrons fill 1s (1s²).

So, [He] can be written before the electronic configuration of 2s² 2p⁵.

Ne contains 10 electrons fill (1s² 2s² 2p⁶).

So, [Ne] can be written before the electronic configuration of 3s².

Ar contains 18 electrons is configured as ([Ne] 3s² 3p⁶).

So, [Ar] can be written before the electronic configuration of 4s² 3d¹⁰ 4p².

Kr contains 36 electrons is configured as ([Ar] 4s² 3d¹⁰ 4p⁶).

So, [Kr] can be written before the electronic configuration of 5s² 4d¹⁰ 5p⁵.

Xe contains 54 electrons is configured as ([Kr] 5s² 4d¹⁰ 5p⁶).

So, [Xe] can be written before the electronic configuration of 6s² 4f¹⁴ 5d¹⁰ 6p².

Answer:

This is the Order :)

For Plato

Answer:

1.52 g NaOH

Explanation:

The molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance.

Molar mass of NaOH is 40.0 g/mol

40.0 g/mol contains 6.022 × 10²³ molecules

∴ 2.30 × 10²² molecules will contain (2.30 × 10²²) * (40.0)/6.022× 10²³

                                                             = 1.52 g NaOH

Answer:

The student did not work with absolute temperatures, and the answer should be 85 kPa.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

P₁T₂ = P₂T₁

P₁ = 100.0 kPa, T₁ = 60.0°C + 273 = 333.0 K.

P₂ = ??? kPa, T₂ = 10.0°C + 273 = 283.0 K.

∴ P₂ = P₁T₂/T₁ = (100.0 kPa)(283.0 K)/(333.0 K) = 84.98 kPa ≅ 85.0 kPa.

The student did not work with absolute temperatures, and the answer should be 85 kPa.

The student did not work with absolute temperatures, and the answer should be 85 kPa.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and V are constant, and have two different values of P and T:

P₁T₂ = P₂T₁

P₁ = 100.0 kPa, T₁ = 60.0°C + 273 = 333.0 K.

P₂ = ??? kPa, T₂ = 10.0°C + 273 = 283.0 K.

∴ P₂ = P₁T₂/T₁ = (100.0 kPa)(283.0 K)/(333.0 K) = 84.98 kPa ≅ 85.0 kPa.

So, the right choice is:

The student did not work with absolute temperatures, and the answer should be 85 kPa.

Answer:

The right answer is:

Replacing the powdered lead oxide with its large crystals

Removing lead (IV) oxide from the reaction mixture

Using 1.0 gram of lead (IV) oxide

Explanation:

Based on the given information this reaction is the catalytic decomposition of H₂O₂ into water and oxygen  using Lead (IV) oxide as a catalyst.

     2. Also, Removing lead (IV) oxide from the reaction mixture  the reaction rate decreased because as the catalyst is removed.

     3.  Using 50 cm³ of hydrogen peroxide  doesn't affect the rate because the concentration of the reactant doesn't change.

     4. Using 1.0 gram of lead (IV) oxide would decrease the reaction rate because the amount of catalyst decreased

So, The right answer is:

Replacing the powdered lead oxide with its large crystals

Removing lead (IV) oxide from the reaction mixture

Using 1.0 gram of lead (IV) oxide

Answer:

is relatively unreactive except for combustion

Explanation:

Answer:

Option 3

Explanation:

Did the odyssey and it's the right answer

B. Potential energy being converted into kinetic energy.    Hope this helps!

The second answer choice

An excess of copper may dissolve in a solution during a redox reaction with, for example, a silver nitrate solution where copper wire oxidizes to form copper(II) ions, imbuing the solution with a blue color. Similar conditions can occur in the decomposition of copper from copper ore, chalcocite.

Too much copper might go into solution under certain conditions, most commonly in the presence of a chemical reaction where copper is oxidized. For example, when copper wire is placed in a solution containing dissolved silver salt, it undergoes a redox reaction. During this reaction, copper oxidizes to form copper(II) ions, Cu²+ (aq), resulting in a characteristic blue color in the solution due to the dissolved copper ions.

This is the case when the silver nitrate solution reacts with the copper wire. The silver ions are reduced to elemental silver which deposits on the copper wire while copper ions dissolve in the solution. This process spontaneously occurs making the solution more and more blue in color.

An important source of copper is from copper ore, chalcocite, which upon heating decomposes to form copper and sulfur. This is another scenario when copper might dissolve in a solution if the surrounding conditions favor this particular reaction.

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Answer: hey plato buddie, the answer is A! zero

Explanation:

Answer : The overall order of reaction is, (A) zero order reaction.

Explanation :

Rate of reaction : It is defined as the rate of change in concentration of reactant or product with respect to time.

Order of reaction : It is defined as the sum of the exponents or powers to which the molar concentration in the rate law equation are raised to express the observed rate of reaction.  It depends on the power of concentration of reactant.

As per question, the given rate expression is,

[tex]Rate=k[/tex]

From this expression we conclude that there is no power of concentration of reactant. That means, it is a zero order reaction.

Hence, the rate order of reaction is, zero order reaction.

MnO4- (aq) + 8H+ (aq) + 5e− → Mn2+ (aq) + 4H2O (l)

According to the ionic equation, the half reaction which occurs at cathode is MnO₄[tex]^-[/tex] (aq) + 8H [tex]^+[/tex](aq) + 5e− → Mn²[tex]^+[/tex](aq) + 4 H₂O (l).

Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are present.

An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.

Strong acids and bases exist as dissociated ions present in the solution and are written in forms of ions in ionic equation.Weak acids and bases do not dissociate completely and hence are written in the form of molecular formula.

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Answer:

[tex]\boxed{\text{B and C }}[/tex]

Explanation:

In a single-displacement reaction, one element exchanges partners with another element in a compound.

[tex]\textbf{A. } \rm Fe + 2HCl \longrightarrow FeCl_2 + H_2[/tex]

This is a single-displacement reaction, because the element Fe exchanges partners with H in HCl.

[tex]\textbf{B. } \rm KOH + HNO_3 \longrightarrow H_2O + KNO_3[/tex]

This is not a single-displacement reaction, because it is a reaction between two compounds.

This is a double displacement reaction in which the K⁺ and H⁺ cations change partners with the anions.

[tex]\textbf{C. } \rm Na_2S + 2HCl \longrightarrow 2NaCl + H_2S[/tex]

This is not a single-displacement reaction. It is another double displacement reaction, in which the Na⁺ and H⁺ cations change partners with the anions.

[tex]\textbf{D. } \rm Ca + 2HOH \longrightarrow Ca(OH)_2 + H_2[/tex]

This is a single-displacement reaction, because the element Ca exchanges partners with H in H₂O.

[tex]\boxed{\textbf{B and C }}[/tex] are not single-displacement reactions.

The controversy over lunar craters involves two main theories: volcanic activity and meteoric impacts.

The controversy surrounding lunar craters primarily focuses on their origin. One theory suggests volcanic activity akin to terrestrial calderas, such as Crater Lake in Oregon. However, this theory has largely been abandoned due to the lack of lava flows and insufficient debris around lunar craters to suggest volcanic origins. Instead, many scientists now support the impact theory, which proposes that these craters were formed by the collision of meteorites with the moon's surface. Significant objections arise from the observation that most lunar craters appear round, as if struck by objects falling directly towards the moon. Critics argue that meteorites, which typically travel at high velocities, would more likely strike at oblique angles, creating elongated gouges rather than round craters.

Despite these objections, the impact theory is supported by the presence of features such as rays extending from the craters, indicative of high-energy impacts that pulverize rock into powder and eject it across the moon's surface. Large craters, such as the Aitken Basin, and maria on the Moon further challenge both volcanic and impact theories. The Aitken Basin for example, is vast, and maria demonstrate how large impacts can penetrate deep enough to allow lava flow from the lunar interior to fill basins. Additionally, when comparing Earth to other celestial bodies, we see fewer craters on our planet due to atmospheric and geological activity. This difference helps in understanding Earth's unique history.

Answer:

The answer is C. AB is an intermediate; therefore the rate law is determined from the reactants in the previous step.

I just took the test and C. was correct. Please mark me as brainliest!

Answer:  C: AB is an intermediate; therefore the rate law is determined from the reactants in the previous step.

Explanation:  :  Rate law is usually determined from the slowest step of the reaction mechanism.

Thus as we can see that the reaction which is slow has AB as its intermediate, rate law can be determined from the same.

Moreover , we can see that the overall rate law is very different from the rat law determined from the slowest step.

Answer:

1- Option A = Sink

2- Option B = Float

Explanation:

1- If an object’s density is greater than 1.00 g/mL, it will sink in water.

For example, the density of aluminum is 2.7g/cm³. That is why it will sink in water.

2- If an object’s density is less than 1.00 g/mL, it will float in water.

For example, the density of oak is 0.7 g/cm³. That is why oak will float in water.

3-  Given data:

Mass, m = 50 g  

Volume, v = 10 cm3 ( 1ml = 1cm3)

Formula of density :          

Density = mass/ volume

          d = m/v

          d = 50g/10cm3

          d = 5 g/cm3

It’s C. One or more substances with different chemical properties will form.

Answer:

Independed Variable:

food, water, container

dependent variable:

temperature

Hypothesis:

That there are less chirps if temperature is lower

constants:

food, water, container

repeated trials:

10 crickets and 10 containers, 10x accurate than using 1 and 1

control:

Crickets and containers

Answer:Dynamic Equilibrium Examples. Any reaction will be in dynamic equilibrium if it's reversible and the rates of the forward and reverse reactions are equal. For example, say that you prepare a solution that is saturated with an aqueous solution of NaCl.

Explanation:

Answer:

2,4,5

Explanation:

on edg