Which best sequences the organization of the Universe from LARGEST to SMALLEST? *

Asteroids, Moons, Planets, Stars, Star Systems, Galaxies, Galaxy Clusters, Universe

Galaxy Clusters, Galaxies, Stars, Planets, Moons, Comets

Universe, Stars, Planets, Asteroids

Universe, Galaxies Clusters, Galaxies, Star Systems, Stars, Planets, Moons, Asteroids

Answer: An experimental group, also known as a treatment group, receives the treatment whose effect researchers wish to study, whereas a control group does not

Explanation:

The control group and experimental group are compared against each other in an experiment. The only difference between the two groups is that the independent variable is changed in the experimental group. The independent variable is "controlled" or held constant in the control group

Answer:

All of these stoichiometry problems are worked alike. Here is the 4 step process.

4Na + O2 → 2Na2O

Step 1. Write and balance the equation. You have that.

Step 2. Convert whatever you have to mols. If a solid then mols = grams/molar mass = ?. If a solution then mols = M x L = ? In this case, the molar mass of Na2O is approx 62 so mols = 2/62 = approx 0.03 but that's just a close guess. You should do it more accurately.

Step 3. Using the coefficients in the balanced equation, convert mols of what you have to mols of what you want. You have mols Na2O and you want to convert that to mols Na.

0.03 mols Na2O x (4 mols Na/2 mols Na2O) = about 0.06. Note that mols Na2O in the numeratorof the first term cancels with mols Na2O in the denominator of the second term which leaves mols Na which is what you want. In practice you ALWAYS know that the coefficient of the unit you are converting to goes on top and the coefficient of mols you have goes on the bottom.

4. Now convert mols of what you want to grams. grams = molsl x molar mass - about 0.06 x 23 = about ?

Copy this. It can come in handy for every chemistry course you take.

Explanation:

According to the stoichiometry of the given chemical equation, 1.703 g of sodium is needed to make 2 g sodium oxide.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is used in balancing chemical equations and preparation of solutions.From the given chemical equation, 92 g sodium gives 108 g sodium oxide, thus, 2 g is prepared by 92×2/108=1.703 g of sodium.

Thus, according to the stoichiometry of the given chemical equation, 1.703 g of sodium is needed to make 2 g sodium oxide.

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Answer:

it is very easy why you can't know it

Answer:

two hydroxide ions

Explanation:

Ba(OH)2 in aqueous solution can provide two hydroxide ions per molecule.

There are 1.392 x \(10^{24\) hydroxide ions in 198g of barium hydroxide.

Step 1: Calculate the molar mass of \(Ba(OH)_2\).

Ba (barium) has a molar mass of 137.33 g/mol.

O (oxygen) has a molar mass of 16.00 g/mol.

H (hydrogen) has a molar mass of 1.01 g/mol.

Molar mass of \(Ba(OH)_2\) = (137.33 g/mol) + 2 * (1.01 g/mol) + 2 * (16.00 g/mol)

= 171.33 g/mol

Step 2: Calculate the number of moles of \({\text}Ba(OH)_2\).

Number of moles = Mass (in grams) / Molar mass

                             = 198 g / 171.33 g/mol

                             = 1.157 moles

Step 3: Consider the stoichiometry of \({\text}Ba(OH)_2\).

The chemical formula of barium hydroxide is \({\text}Ba(OH)_2\), which means that for each mole of \({\text}Ba(OH)_2\), there are two moles of hydroxide ions (OH^-).

Step 4: Calculate the number of hydroxide ions.

Number of hydroxide ions = Number of moles of \({\text}Ba(OH)_2\) * 2

                                            = 1.157 moles * 2

                                            = 2.314 moles

Now, Actual number of hydroxide ions

= 2.314 moles * 6.022 x \(10^{23\) ions/mol

= 1.392 x \(10^{24\) hydroxide ions

So, 1.392 x \(10^{24\) hydroxide ions in 198g of barium hydroxide.

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The traits that the offspring got were taken from the parents.

Offspring get traits from their parents through the process of inheritance. Traits are determined by genes, which are segments of DNA that contain the instructions for building and maintaining an organism's body and traits.

Each parent contributes half of their genes to their offspring through their gametes, which are reproductive cells such as sperm and eggs. When a sperm fertilizes an egg, the resulting zygote has a complete set of genes from both parents.

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Answer:

C Ammonia

Pure water is neutral, so pH is about 7

Vinegar is acidic, pH is around 2-3

Ammonia is alkaline, pH around 11.6

Vitamin C is also acidic, pH is around 3.5 to 6

As pH increases with how alkaline the substance is, substances with a lower pH is more acidic, while substances with a higher pH is more alkaline

the question is asking for the highest pH, so you should choose the most alkaline substance

therefore the ans is C, which is ammonia

The rate law for the reaction is Rate = \(k[NO2]^1[F2]^1\), and the rate constant is k = 25.0 L/(mol·s).

We must analyse the data to find the reaction's rate law and rate constant. Examine the data table:

Trial 1: [NO2] = 1.0×10^(-3) mol/L
[F2] = 2.0×10^(-3)

Initial rate: 5.0×10^(-2) mol/(L·s).

Trial 2: [NO2] = 1.0×10^(-3) mol/L [F2] = 4.0×10^(-3)

Initial rate: 1.0×10^(-1) mol/(L·s).

Trial 3: [NO2] and [F2] = 2.0×10^(-3) mol/L.

Initial rate: 1.0×10^(-1) mol/(L·s).

Trial 4: [NO2] = 3.0×10^(-3) mol/L [F2] = 6.0×10^(-3)

Initial rate: 4.5×10^(-1) mol/(L·s)

From trial 1 to trial 3, doubling the [NO2] concentration while maintaining [F2] doubles the initial rate. This suggests a first-order reaction with respect to [NO2].

Keeping the [NO2] constant, doubling the [F2] concentration from trial 1 to trial 2 doubles the original rate. The response is first-order with regard to [F2].

After determining the reaction sequence for each reactant, we can formulate the rate law expression:

\(Rate = k[NO2]^1[F2]^1\)

1+1=2 since both reactants are first order.

We can use any trial to get the rate constant (k). Trial 1:

5.0×10^(-2) mol/(L·s)=k(1.0×10^(-3) mol/L)(2.0×10^(-3) mol/L)

Simplifying, k = 25.0 L/(mol·s)/(5.0×10^(-2))/(1.0×10^(-3)×2.0×10^(-3)).

Thus, the reaction rate rule is Rate = \(k[NO2]^1[F2]^1\) with k = 25.0 L/(mol·s).

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Enantiomers are pairs of compounds with exactly the same connectivity but opposite three-dimensional shapes.

What is a enantiomer?

In chemistry, an enantiomer (also called an optical isomer, enantiomer, or optical antipode) is one of two stereoisomers that are not superimposable on their own mirror image. Enantiomers are similar to the right and left hands and cannot be superimposed when looking at the same face. No amount of reorientation will align the four unique groups (see Chirality (Chemistry)) on the chiral carbons exactly. The number of stereoisomers a molecule has can be determined by the number of chiral carbons it has. Stereoisomers include both enantiomers and diastereomers.

Like enantiomers, diastereomers have the same molecular formula and are not superimposable, but they are not mirror images of each other.

Therefore, Enantiomers are pairs of compounds with exactly the same connectivity but opposite three-dimensional shapes.

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Answer:

B has highest stability

Explanation:

as its octet is complete

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To find the mass of copper oxide that reacted, the student could follow these steps given in the explanations.

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We have that the bond angles that are closest to the actual values for the h-n-c and o-c-o bond angles are

Generally, In H-N-C bond nitrogen has Sp3 hybridization, it will have the angle 109.5 degrees.

In O-C-O bond C atom has sp^2 Hybridization so it will have the angle by 120 degrees.

Therefore,bond angles that are closest to the actual values for the h-n-c and o-c-o bond angles are

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H3PO4 is the molecular formula (hill method) of phosphoric acid.

Phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid with the chemical formula H3PO4 that contains phosphorus. It is frequently found as an 85% aqueous solution, which is a syrupy liquid that is colorless, odorless, and non-volatile. It is a significant industrial chemical that is used in numerous fertilizers.

This substance is an acid. The phosphate ion PO3^4- is produced when all three H+ ions are removed. Dihydrogen phosphate ion H2PO 4 and hydrogen phosphate ion HPO2^4- are produced, respectively, by removing one or two protons. Organophosphates are esters created by phosphoric acid.

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Answer:

6.02E23Na

Explanation:

you just convert the element to a decimal form

When two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting, then their kinetic energy keeps increasing, acceleration keeps decreasing, kinetic energy keeps decreasing, electric potential energy keeps decreasing.

The electrostatic force is a force that arises between electrically charged objects. It is the force exerted on a charged particle by other charged particles or electromagnetic fields. It is a fundamental force in nature that has an infinite range and can be either attractive or repulsive. The strength of the electrostatic force is proportional to the inverse square of the distance between the charged particles. As two charged particles move closer together, the force between them increases. Therefore, as the two protons move closer together, their kinetic energy and electric potential energy will increase.

According to Coulomb's law, the electrostatic force is inversely proportional to the square of the distance between the two charges. Therefore, as the distance between the two protons decreases, the electrostatic force acting between them will increase. As a result, their acceleration will keep decreasing. At the same time, as the protons move closer together, their kinetic energy will keep increasing while their electric potential energy will keep decreasing.

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Answer:

on what

Explanation:

First we need to find the wavelength from the frequency using \(C = \lambda V\)

so \(3.0e8 = \lambda * 2.2e16 Hz\) which equals 1.36e-8 m then we use the formula \(E =h \frac{C}{\lambda}\) we plug in \(E = 6.63e-34 * (3.0e8/1.36e-8)\) and we get \(E = 1.46e-17\)

so the energy is 1.46 x 10^-17 J.

Answer:

A, 1.5 × 10 ^–17 J

Explanation:

edge

Explanation:

eam=%abudance×mass+%abudance×mass

eam=19.8%×10.013/100+80.2%×11.009/100

eam=198.2574/100+882.9218/100

eam=1081.1792/100

eam=10.811792

eam=10.812

Answer:

yes jrs true

Explanation:

In some ways, sparks are harmful. So, the statement e is not true.

When an ionized, electrically conductive channel is formed through a typically insulating substance by a sufficiently strong electric field, it results in a sudden electrical discharge known as an electric spark.

Here,

Sparks are the sudden electric discharges; therefore, we can say that they are capable of causing damage to the sensitive electronic devices.

Also, a small, sudden ignition spark created in grain elevators can eventually cause mild explosions.

In an operating room, sparks can start an explosion of anesthetic gas.

Heart pacemakers can be harmed by sparks.

So we can say that sparks are capable of causing many types of damages. So, it is dangerous in someway.

Hence,

In some ways, sparks are harmful. So, the statement e is not true.

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Answer:3

Explanation:

The volume of water in the container is 292.2 mL.

The molecules in water must be able to move more quickly in order for the temperature to rise, and in order to do this, the hydrogen bonds that bind them must be severed. These intermolecular interactions must be broken by the heat that water absorbs. Before the temperature of the water can rise.

We can used the formula:

Q = m * c * ΔT

Q = amount of heat absorbed by the water

m = mass of water

c = specific heat capacity of water

ΔT = change in temperature of the water

Given;

Q = 64.4 kJ

ΔT = (73.4 - 22.0) °C = 51.4 °C

c = 4.18 J/(g·°C)

Converting the units of Q to Joules:

Q = 64.4 kJ * 1000 J/kJ = 64400 J

Now:

m = Q / (c * ΔT)

m = 64400 J / (4.18 J/(g·°C) * 51.4 °C)

m = 292.2 g

The density of water:

Density = mass / volume

volume = mass / density

volume = 292.2 g / 1 g/mL = 292.2 mL

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thermal energy leads to an increase in the kinetic energy also increasing in temperature hope this helped!

Answer:

thermal energy leads to an increase in the kinetic energy also increasing in temperature This is known because temperature is in fact the measure of the average kinetic energy of the molecules.

Explanation:

hope this helps❤️

Answer: The answer is 1/4

Explanation:

Therefore, the fraction of an original sample of tritium that remains unchanged after 24.62 years will be 1/4.

A fraction denotes a portion of something larger or, more broadly, any quantity of equal pieces.

Calculation of fraction

Given data:

t = 24.62 years = 25 years.

T = 12.5 years

Fraction can be calculated by using the formula:

N / \(N_{0}\) = (1/2) power n..................(i)

n = t / T,......(ii)

Put the value of t and T in fraction equation.

n = 25 / 12.5

n = approx = 2.

Now, using equation (ii).

N / \(N_{0}\) = (1/2) power 2

N / \(N_{0}\)  = 1/4.

Therefore, the fraction of an original sample of tritium that remains unchanged after 24.62 years will be 1/4.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

C. representative elements.

Explanation:

Families 1 - 2 and 13 - 18 are called representative elements or often times, main group elements.

The reasonable transmittance values when a white light shines through \(CuSO_{4}\) solution is A. Red light: %T = 10% Green light: %T = 90%

If a solution appears purple then, B. It is transmitting purple light.

For a solution of CuSO_{4}, reasonable transmittance values would be:

A. Red light: %T = 10% Green light: %T = 90%

This is because the solution absorbs most of the red light and transmits most of the green light. Also, higher the absorbance of light, lower will be the % transmittance.

If a solution appears purple: B. It is transmitting purple light.

This is because the solution is reflecting and transmitting the purple light, which is why we perceive it as purple.

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The statement that is true about alloy is that; they can only be composed of metals.

An alloy is a substance that is obtained by the combination of two or more metals. Alloys are produced owing to the fact that they may be stronger or more durable or resistant to corrosion than the individual metals.

There are many allows that find very good use such as the alloy of copper and zinc which we call bronze that could be used as an ornamental. The statement that is true about alloy is that; they can only be composed of metals.

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Answer:

Dalton's 5 postulates

All matter consists of indivisible particles called atoms.

Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.

Atoms cannot be created or destroyed.

Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.

Explanation:

Answer:

Barium is lower in group 2 than magnesium, so number of shells increase. The valence electron is further from the nucleus making it easier to lose electrons.

Explanation:

Barium has more electrons shells than calcium, so the nuclear shielding is stronger, and the outmost electrons are further away from the nucleus. This results in a weaker attractive force between the electron and the nucleus, so a smaller energy is required to remove it.

Answer:

Barium has a greater radius than magnesium

Explanation:

Barium and magnesium are two elements which belong to the same group, group 2A. This means that the two elements have two valence electrons in their outer shell.

The difference is, however, since barium

is lower in group than magnesium, it has

more electron shells than magnesium and,

therefore, its radlus is greater. The attraction

force between the nucleus and the valence

electrons in barium is lower as a result, as force

is inversely proportional to distance. Hence, a

lower amount of energy is required to remove

the valence electrons from barium.

Explanation:

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