Any change to an atom's
will change one atom into a completely different
one. *
•neutrons
•nucleus
•valence electrons
•protons

Answer:

Any two reasons will be :

1:- It is based on atomic number.

2:-Problem regarding Position of isotopes is resolved.

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Hope this helped ALL THE BEST !!

Answer:

The modern periodic table has more info and more elements

Explanation:

Answer:

It provides the energy for all life on Earth and thus all Earth's ecosystems. Plants convert sunlight to make their own food, which they use to support their own lives. When animals eat plants, they eat this "ready-made" food, formed from energy originally provided by the sun.

Explanation:

Answer:

Letter B.

Explanation:

Changing its direction and climbing a steep incline can't be proven only by the graph info. You can see that it's speed isn't constant in the graph.

We have letter B left.

The average temperature is 17.0 °C.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.

Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the International System of Units' (SI) seven base units is the kelvin law of cosines.

The lowest point on the thermodynamic temperature scale is absolute zero, or zero kelvin, or 273.15 °C.

To find the average temperature, we add up the individual temperatures and divide by the total number of measurements. Let's calculate:

Average temperature = (16.9 + 17.0 + 17.1) / 3 = 51.0 / 3 = 17.0

Therefore, the average temperature is 17.0 °C.

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The  type of bond connects the fatty acid will be " an ester bond".

Fatty acids could be joined to each of the three carbons of the glycerol molecule in a fat molecule by an ester bond that passes through into the oxygen atom. Three molecules are emitted during the establishment of the ester bond. Fats were also known as triacylglycerols as well as triglycerides because they are made consisting of three fatty acids and glycerol.

The three major nutrients in a diet may be carbohydrates, proteins, and fats. According to how many hydrogen bonds they contain, fats are classified as either saturated as well as unsaturated.

The  type of bond connects the fatty acid will be " an ester bond".

Hence, the correct answer will be option (c)

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Sugar is a simple carbohydrate consisting of carbon, oxygen, and hydrogen molecules which are linked by covalent bonds.

The chemical covalent bonds are a type of chemical bond in which atoms that differ in their electronegativity share electrons to maintain cohesion i.e., intramolecular cohesion, while sugar molecules may interact by glycosidic bonds.

Therefore, with this data, we can see covalent bonds bind atoms in the sugar molecule while glycosidic bonds are those required to connect different sugar and thus form a complex macromolecule or polysaccharide.

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Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

The question requires us to calculate the amount of a 0.250 M sucrose solution necessary to prepare 400.0 mL of a 0.0310 M solution.

The question provided the following information:

molarity of more concentrated solution = C(A) = 0.250 M = 0.250 mol/L

molarity of less concentrated solution = C(B) = 0.0310 M = 0.0310 mol/L

volume of less concentrated solution = V(B) = 400.0 mL

The question refers to a simple dilution process, where we use a more concentrated solution (A) to preare a less concentrated solution (B). The amount of sucrose in both solutions doesn't change, thus we can say that the number of moles of sucrose in A is the same as it is in B:

From the definition of molar concentration (also called molarity), we can say that the number of moles of a solution corresponds to its concentration (in mol/L) multiplied by its volume (in L):

Considering the two equations above, we can write:

We can also rearrange this equation in order to calculate the volume of more concentrated solution, V(A), necessary:

Now, we can use the values given by the question in the equation to calculate V(A):

Therefore, 49.6 mL of a 0.250 M sucrose solution are necessary to prepare 400.0 mL of a 0.0310 M solution. Note that, as 400.0 mL is the total volume of the solution B, this solution should be prepared with 49.6 mL of solution A + 350.4 mL of water.

Answer:

4 Ethanol has a boiling point of 89 C at standard pressure.

Answer:

The mass is 20, 89 grams of He.

Explanation:

We calculate the weight of 1 mol of He, from the atomic weight of each element obtained from the periodic table: Weight 1 mol He= 4, 0020602 g. 1 mol He-----4, 0020602 g. 5,22 mol He---x= (5,22 mol He x4, 0020602 g)/ 1 mol He= 20, 89 g

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The mass of 5.22 mol of He will be 20.84 grams.

We have 5.22 mol of He.

We have to calculate its Mass.

Helium is a chemical element with the symbol He and atomic number 2. It is a gas which is colorless, odorless, tasteless, non-toxic, inert and monatomic.

According to the question -

Number of moles of Helium = 5.22 mol

Now, I mole of Helium will have its mass equal to its Atomic weight. Therefore -

Mass of 1 mole of He = 4.002602 g

So, the mass of 5.2 mol of He will be = 5.2 x 4.002602 = 20.84 grams

Hence, the mass of 5.22 mol of He will be 20.84 grams.

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The diagram shows the arrangement of the outer electrons only in a molecule of ethanoic acid.

a) The different elements found in this compound is Carbon, Hydrogen and oxygen.

b)  The total number of atoms present in this molecule is 8.

c) Between which two atoms is there a double covalent bond is in the  between of one carbon atom and oxygen atom.

d)  number of the covalent bonds does each carbon atom make is 7.

e) this compound to be a liquid at room temperature

Thus, The diagram shows the arrangement of the outer electrons only in a molecule of ethanoic acid.

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Answer:

pH=14-pOH

1. B

pOH= 14- pH

2.B

Explanation:

Answer:

1. B

pH=14-pOH

2.B

pOH= 14- pH

Explanation:

According to the research, the correct answer is that inner core and the outer core are geological layers of the Earth, which are similar in composition and both are extremely hot.

It refers to the innermost sector of the planet, being the layer formed mainly by iron and nickel whose internal pressure is higher than the pressure of the earth's surface.

In this sense, the inner core and outer core of the Earth are composed of iron-nickel or alloys thereof, with some other elements exhibiting high temperatures but unlike the solid inner core of the Earth, the outer core is liquid since there is not enough pressure to keep it in a solid state.

Therefore, we can conclude that according to the research, a wide range of concentrations of iron and nickel is found in the outer and inner core of the Earth.

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The decay constant (k) is approximately -0.001729 and the half-life (T1/2) is approximately 401.3 days.

To determine the decay constant (k) and the half-life of a radioactive nucleus, we can use the information given in the question.

The decay constant (k) is a measure of how quickly the material decays. It is related to the half-life (T1/2) of the material through the equation:

k = ln(2) / T1/2

where ln(2) is the natural logarithm of 2, approximately 0.693.

In this case, we are told that 75% of the material has decayed in 400 days. To find the decay constant (k), we need to use the following equation:

N/N0 = e^(-kt)

where N is the amount of material remaining, N0 is the initial amount of material, e is the base of the natural logarithm, k is the decay constant, and t is the time.

Let's use this equation to find the decay constant (k):

75% of the material has decayed, so 25% of the material remains. This means that N/N0 = 0.25.

Plugging in these values into the equation:

0.25 = e^(-k * 400)

To solve for k, we can take the natural logarithm of both sides of the equation:

ln(0.25) = -k * 400

Dividing both sides of the equation by -400:

k = ln(0.25) / -400

Using a calculator, we find that k is approximately -0.001729.

Now, let's find the half-life (T1/2) using the equation:

k = ln(2) / T1/2

Plugging in the value of k:

-0.001729 = ln(2) / T1/2

To solve for T1/2, we can rearrange the equation:

T1/2 = ln(2) / -0.001729

Using a calculator, we find that the half-life (T1/2) is approximately 401.3 days.

In summary, the decay constant (k) is approximately -0.001729 and the half-life (T1/2) is approximately 401.3 days.

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The estimated age of the rock is approximately 1.58 x 10^10 years.

To estimate the age of the rock based on the mass ratio of 208Pb to 232Th, we can use the concept of radioactive decay and the half-life of 232Th.

The ratio of 208Pb to 232Th in the rock represents the amount of 208Pb that has been formed through the radioactive decay of 232Th over time. Since one 208Pb atom is the final decay product of one 232Th atom, the mass ratio can be used to determine the fraction of 232Th that has decayed.

Given that the mass ratio of 208Pb to 232Th is 0.28/1.00, we can calculate the fraction of 232Th that has decayed as follows:

Fraction of 232Th decayed = (1 - mass ratio of 208Pb/232Th) = (1 - 0.28/1.00) = 0.72

The fraction of 232Th that has decayed corresponds to the fraction of the original amount of 232Th present in the rock. Using the concept of half-life, we can relate this fraction to the age of the rock.

Since the half-life of 232Th is 1.39 x 10^10 years, we can calculate the number of half-lives that have passed using the fraction of 232Th decayed:

Number of half-lives = log(base 0.5) (fraction of 232Th decayed)

Number of half-lives = log(base 0.5) (0.72) ≈ 1.14

The number of half-lives represents the time elapsed, and each half-life is equal to 1.39 x 10^10 years.

Therefore, the age of the rock can be estimated as:

Age of the rock = Number of half-lives x Half-life of 232Th

= 1.14 x 1.39 x 10^10 years

≈ 1.58 x 10^10 years

The estimated age of the rock is approximately 1.58 x 10^10 years.

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A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.

Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.

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The mistake made by the student during the experiment was to assume that the solution was homogeneous, but it was a mixture. The given statement shows the mixture was made up of 15% NH4Cl, 18% NaCl, and 77% SiO2.

There are two types of materials: pure substances and mixtures. A pure substance has a consistent and definite composition. A mixture is a physical combination of two or more substances that can be separated using physical means. Liquid solutions are the most common mixtures.

The most well-known liquid solutions are soda and saltwater. Homogeneous mixtures are mixtures that are uniform throughout. In other words, the composition is the same everywhere. However, heterogeneous mixtures are mixtures that are not uniform throughout. They don't have the same composition in all places. Saltwater is an example of a homogeneous mixture.

Likewise, the student likely made a mistake in assuming that the mixture was homogeneous when calculating the percentages of NH4Cl, NaCl, and SiO2. However, it's clear that the mixture is heterogeneous based on the fact that it contains several components.

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Answer:

165.3 cm^3

Explanation: hope this is correct!!

P1 * V1 / T1 = P2 * V2 / T2

P1 = 84.6 kPa

V1 = 215 cm³

T1 = 23.5°C = 23.5 + 273 K = 296.5 K

At STP:

P2 = 101.3 kPa

V2 = ?

T2 = 273 K

Answer: yes the atomic number goes on top of the symbol or does the mass number go on top

Explanation: yes the atomic number goes on top of the symbol or does the mass number go on top

if you binding energy for thr nuclide 199F in Mev per nucleu the result is 7.78MeV.

What is energy?

energy is ability to do the work . Sicientist define energy as the ability to do the work. mordencivilizwtion is possible because people to learn how to energy form one form to another and then do the work.

Mass defect

=[{9×1.0078)+(10×1.0087)}−18.9984]mu

=0.1588mu

Binding energy per nucleon

=(0.1588×931)Mev/19

7.78 MeV`

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The moles of hno3 are present if 0.180 molmol of ba(oh)2 was needed to neutralize the acid solution is 0.36 mole of HNO₃.

Neutralization or neutralisation is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization outcomes in there being no excess of hydrogen or hydroxide ions gift inside the answer.

Calculation:-

Valance factor of HNO₃ is = 1

valance factor of Ba(OH)₂ is = 2

mole of Ba(OH)₂ is = 0.180

therefore mole oh HNO₃ neede is = 2 * 0.180

                                                         =  0.36 mole of HNO₃

Neutralisation is a chemical response wherein an acid and a base react with each different quantitatively. it's also written as Neutralisation. The acid electricity of the reactant gives the pH of the neutralised solution.

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Answer:

a. 550 dm

Explanation:

Answer:

Reaction between an oxygen and  a phosphorus will produce oxides of phosphorus.

Explanation:

Reaction between oxygen and phosphorus produces four atoms of phosphorus with five atoms of oxygen. Sometimes it produces two atoms of phosphorus and five atoms of oxygen and sometimes four atoms of phosphorus and six atoms of oxygen. It does so depending upon the availability of oxygen. The size of phosphorus atom  interferes with the ability to form a double bonds to the other elements, such as nitrogen, oxygen, etc.

Answer:

Formal

Explanation:

Answer:

I think its formal because the question looks a bit fancy by using all the present perfect tense..

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When the molarity of an acid is 5.5, the concentration of hydroxide ions (OH-) in the solution is approximately 1.82 * 10^{-15} mol/L.

To determine the concentration of hydroxide ions (OH-) in a solution when the molarity of an acid is 5.5, we need to use the concept of "molarity" and understand the relationship between an "acid" and its corresponding base.
Step 1: Determine the concentration of hydronium ions (H3O+)
Molarity of an acid represents the concentration of hydronium ions (H3O+) in the solution. In this case, the molarity of the acid is 5.5, which means the concentration of H3O+ ions is 5.5 mol/L.
Step 2: Use the ion product constant of water (Kw)
In any aqueous solution, there is a relationship between the concentration of hydronium ions (H3O+) and hydroxide ions (OH-). This relationship is described by the ion product constant of water (Kw), which is 1.0 *10^{-14}at 25°C.
Kw = [H3O+] [OH-]
Step 3: Calculate the concentration of hydroxide ions (OH-)
Now, we can use the Kw value and the concentration of H3O+ ions to find the concentration of OH- ions in the solution.
1.0 *10^{-14} = (5.5) [OH-]
Divide both sides of the equation by 5.5:
[OH-] =\frac{( 1.0 *10^{-14}) }{ 5.5}
Step 4: Solve for [OH-]
[OH-] ≈ 1.82 * 10^{-15} mol/L
So, when the molarity of an acid is 5.5, the concentration of hydroxide ions (OH-) in the solution is approximately 1.82 * 10^{-15} L.

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The pH strip is used to test the pH of a solution. The pH of water is neutral which is around 7.

The pH is known as the power of hydrogen. The pH is used to measure the  degree of basicity and acidity of a solution. The amount of hydrogen ion concentration in a solution determines the pH of the solution.  Mathematically, pH is given by the formula:

pH -= -log [H⁺]

The pH strip is a strip of litmus paper with which a person can measure the pH value of a liquid solution. The substance in the pH paper causes the paper to show a different color at different acidity values. The official pH scale is between the pH values of 0 to 14, where 0 is very acidic and 14 very alkaline and 7 is neutral pH.

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Answer:

The pH value of the water is 7. And I don't exactly know what would happen if you put a straw into it and blew into it, but if I had to make a guess then I would guess that the pH value would go down because the water is moving around.

The dosage of 26mg can be prepared using approximately 1.625 mL of the 40mg in 2.5 mL solution.

The dosage of 22mg can be prepared using approximately 1.222 mL of the 36mg per 2 mL strength solution.

To calculate the dosage using ratio and proportion, we can set up a proportion based on the strength of the solution.

40mg in 2.5 mL solution will be used to prepare a 26mg dosage.

Let X represent the mL of the solution needed to prepare the 26mg dosage.

We can set up the proportion as follows:

40mg/2.5mL = 26mg/X mL

Cross-multiplying and solving for X, we have:

40mg * X mL = 2.5mL * 26mg

40X = 65

X = 65/40

X ≈ 1.625 mL

For the second question:

36mg per 2 mL strength solution is used to prepare 22mg.

Let Y represent the mL of the solution needed to prepare the 22mg dosage.

We can set up the proportion as follows:

36mg/2mL = 22mg/Y mL

Cross-multiplying and solving for Y, we have:

36mg * Y mL = 2mL * 22mg

36Y = 44

Y = 44/36

Y ≈ 1.222 mL

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Ice continues to float on the surface of the lake because it resides in an open crystalline lattice with vast "gaps" that reduce its density compared to liquid water where the molecules are close together.

Ice has a crystalline composition. This crystalline structure is preserved via hydrogen bonds. The ice molecules are pushed further apart as a result of the hydrogen bonds' orientation. Large gaps are consequently made in this structure. As a result of the closer spacing between water molecules in liquid form, ice has a lower density than liquid water. Ice is hence less thick than water.

Water experiences the phenomenon when it becomes even colder. Water starts to expand at temperatures below 4° Celsius (39°F) and gets less dense as it gets colder. Because of this, when water is almost frozen, the colder water floats to the top and the warmer water sinks to the bottom. The coldest water eventually freezes to form an ice layer after floating to the top of the lake during winter. As soon as the water turns to ice, the ice loses a lot of its water-like density and continues to float on the lake's surface.

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Bruce needs to mix 20 ml of the 10% alcohol solution with 30 ml of the 15% alcohol solution to make 50 ml of a 12% alcohol solution.

To determine the quantities of the 10% and 15% alcohol solutions that Bruce needs to mix, we can set up an equation based on the concentration and volume.

Let's assume that Bruce needs to mix x ml of the 10% alcohol solution and (50 - x) ml of the 15% alcohol solution.

The concentration of the 10% alcohol solution can be represented as 0.10x (since 10% is equivalent to 0.10) and the concentration of the 15% alcohol solution can be represented as 0.15(50 - x).

To achieve a 12% concentration in the final solution, the equation can be set up as follows:

0.10x + 0.15(50 - x) = 0.12(50)

Simplifying the equation, we get:

0.10x + 7.5 - 0.15x = 6

Combining like terms, we have:

-0.05x = -1.5

Dividing both sides by -0.05, we find:

x = 30

Therefore, Bruce needs to mix 20 ml of the 10% alcohol solution with 30 ml of the 15% alcohol solution to make 50 ml of a 12% alcohol solution.

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Answer:

There are three isotopes of silicons. They have masses numbers of 28, 29 and 30. The average amount of silicons is 28.086alum

Explanation:

I learned this in class three days ago so I hope this is helpful i'm in high school  ask me for help when ever you want Iĺl help you