Counting atoms !!! Science help please

Answer:

Are native to the reefs and rocky crevices of the Indo-Pacific, although they've found their way to warm ocean habitats worldwide.

Explanation:

A common industrial use for a mineral is in water purification and as an ingredient in antacids. Minerals like fluorite (calcium fluoride) are extensively used in various industries.

A common industrial use for a mineral is in water purification and as an ingredient in antacids. Minerals like fluorite (calcium fluoride) can be used extensively in various industries. For example, it can be prepared by the reaction of aqueous solutions of calcium chloride and sodium fluoride to yield solid calcium fluoride, which has several industrial applications.

Answer:

Nuclear fusion

Explanation:

Nuclear fusion is the source of Sun's energy.. At the core where temperature and pressure are very high hydrogen atoms fuse into helium atom and release energy in the form of Gama rays.

We can see here that the elements from the Periodic Table are:

1. Chlorine (Cl)

2. Manganese (Mn)

3. Argon (Ar)

4. Sodium (Na)

5. Phosphorus (P)

6. Iron (Fe)

7. Boron (B)

8. Copper (Cu)

9. Neon (Ne)

10. Tungsten (W)

11. Mercury (Hg)

12. Potassium (K)

13.  Calcium (Ca)

14. Radon (Rn)

15.  Beryllium (Be)

16. Cobalt (Co)

17. Barium (Ba)

18. Oxygen (O)

19. Helium (He)

20. Vanadium (V)

The periodic table is a tabular arrangement of the chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. Elements are presented in order of increasing atomic number, which corresponds to the number of protons in the nucleus of an atom.

The periodic table is divided into periods (rows) and groups (columns), and it provides a systematic way to understand and categorize the elements. It's an essential tool in chemistry for understanding the relationships between different elements and their properties.

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Answer:

Number of moles = 0.003 mol

Explanation:

Given data:

Molarity of HCl = 0.300 M

Volume = 10.0 mL (0.01 L)

Number of moles of HCl added = ?

Solution:

Formula:

Molarity = number of moles / volume in litter

Number of moles = Molarity ×  volume in litter

Number of moles =  0.300 mol/L × 0.01 L

Number of moles = 0.003 mol

Answer:

The acceleration of the ball is 200 m/s².

Explanation:

Force:

Force is the push or pull on an object with mass that causes it to change velocity or to accelerate.

Force represents as a vector, which means it has both magnitude and direction.

Given:

Mass of metal ball = 0.025 kg

Force           = 5 N

To Find:

Acceleration, = ?

Solution:

Formula:

[tex]Force = Mass\times Acceleration\\F= ma\\5 = 0.025\times Acceleration\\Acceleration = \frac{5}{0.025} \\Acceleration = 200\ m/s^{2}[/tex]

The acceleration of the ball is 200 m/s².

Answer:

B

Explanation:

She stopped for 4 minutes

She was decreasing in speed

Answer:

The correct answer it 8 m/s north

Explanation:

My test answers

Answer:

3 electrons is contributed from each Nitrogen atom.

Total 6 electrons are shared in N₂.

Explanation:

The electronic configuration of Nitrogen is as:

1s², 2s², 2p³

it exist in diatomic form standard temperature and pressure.

Nitrogen form covalent bond and share 3 electron from each side.

total 6 electron are shared between 2 nitrogen atom.

For Covalent bonding it can share its 3 electrons.  

The diagrammatic representation is in attachment.

Answer:

3!!!!

Explanation:

i have the same assignment for chem, lol

Answer:

Atoms of every element are shown in a skeletal model of an organic molecule.

Explanation:

Skeletal model of an organic molecule consists of various skeletal atoms that are used in making up of the molecule. Various conventions of  hydrogen and  carbon  atoms are employed in it. The molecules bonding and certain representation of molecular geometry are shown in the structural formula.

Use of skeletal formula is ubiquitous in organic chemistry. Thus, in organic chemistry atoms of every element are shown in the skeletal model of an organic molecule

Answer:

3,3-dimethylhexane

why did you set the limit to 20 characters?

Answer:

away from; away from

Explanation:

A divergent boundary occurs when two tectonic plates move away from each other. Here two plates are moving away from each other along this boundary. The result of this motion is that North America is moving away from Europe.

The Mid-Atlantic Ridge is defined as the mid-ocean ridge which is located at the bottom of the Atlantic ocean which stretches approximately 16,000 kilometers from north to south. Mid ocean ridges are large central rift valleys which is surrounded by the mountain ranges created by tectonic forces along divergent plate boundary lines.

The divergent plate boundaries exist between the plates which are spreading apart from each other. This occurs due to the convection currents in the mantle rising and impacting beneath the lithosphere before spreading out and dragging plates along with them.

The mid Atlantic range ridge separates the Eurasian, north American and african plates.

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Answer:

There are two subshells for n=2.

Explanation:

Principal quantum number (n)

It tell about the energy levels. It is designated by n.

For example,

If n =2  

It means there are two energy level present.

Azimuthal quantum number (l)

The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3.

(n-1)

2-1 = 1

thus possible values of l = 0,1

it means principle quantum is 2 and subshells are s and p..

Answer: Why do all the members of a group have similar properties? They have similar properties, because they share similar amounts of electrons in their outer shell, valence electrons! This means they will only be able to interact with other elements with those electrons so they often show similar properties.

Explanation:

Answer:

[tex]\large \boxed{\text{0.0038 mol/L}}[/tex]

Explanation:

1. Calculate the initial moles of acid and base

[tex]\text{moles of acid} = \text{0.0250 L} \times \dfrac{\text{0.200 mol}}{\text{1 L}} = \text{0.005 00 mol}\\\\\text{moles of base} = \text{0.053 L} \times \dfrac{\text{0.100 mol}}{\text{1 L}} = \text{0.0053 mol}[/tex]

2. Calculate the moles remaining after the reaction

                   OH⁻     +     H₃O⁺ ⟶ 2H₂O

I/mol:      0.0053       0.005 00

C/mol:    -0.00500   -0.005 00

E/mol:      0.0003              0

We have an excess of 0.0003 mol of base.

3. Calculate the concentration of OH⁻

Total volume = 53 mL + 25.0 mL = 78 mL = 0.078 L

[tex]\text{[OH}^{-}] = \dfrac{\text{0.0003 mol}}{\text{0.078 L}} = \textbf{0.0038 mol/L}\\\\\text{The final concentration of OH$^{-}$ is $\large \boxed{\textbf{0.0038 mol/L}}$}[/tex]

The half-life of a radioactive isotope is the time it takes for half of the original sample to decay. This can be calculated by measuring how much of the sample remains after a certain period of time. Multiple measurements confirming the same decay period correlate to the half-life of the isotope.

Your question relates to the concept of radioactive decay and the calculation of half-life. The specifics in your question seem a bit off; a heavier mass cannot result from decay, as decay processes result in a decrease of mass. However, let's focus on the main part of your question - how to determine the half-life of a radioactive isotope.

The half-life of a radioactive isotope is the amount of time it takes for half of the sample to decay. Given a particular amount of a radioactive substance (expressed in grams, milligrams, or other units), you can determine the number of half-lives by noting how much of the substance remains after a certain period of time.

For example, if you start with 10 grams of a radioactive isotope and after some time you measure and find you only have 5 grams remaining, that period of time would be one half-life for the isotope. If you then waited the same amount of time and found that you had 2.5 grams left, this would confirm the half-life, as again, half the previous amount had decayed. The actual numerical value of the half-life is dependent on the specific isotope and its decay characteristics.

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Hello. This question is incomplete. The full question is:

"Which chemical equation represents a redox reaction? A. Mg(ClO3)2 + 2HCl → MgCl2 + 2HClO3   B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu(NO3)2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3 "

Answer:

B. CO + H2O → H2 + CO2

Explanation:

The reactions that involve loss and gain of electrons are called oxide-reduction reactions. In the oxidation reaction, electrons are lost, while the reduction reaction consists of gaining electrons.

Oxidation can occur in three circumstances: when oxygen is added to the substance, when a substance loses hydrogen or when the substance loses electrons. Example: fruit salads tend to darken when they come into contact with air, this is because oxygen acts to promote fruit oxidation. A tip to avoid this is to add lemon or orange juice, as the vitamin C present in citrus fruits prevents the oxidizing action of oxygen on the salad.

Reduction, in turn, is the reverse and also occurs in three ways: when a substance loses oxygen, when it gains hydrogen or when it gains electrons. Example: when the copper oxide (black) is placed in an appropriate apparatus (chamber) for its reduction to occur, the hydrogen gas comes in contact with the super heated copper oxide and, as a result, it loses oxygen and gradually goes away. turning pink as it is being reduced to copper.

An example of a redox reaction is CO + H2O → H2 + CO2

A redox reaction is a reaction that involves the transfer of electrons. An example is the reaction between hydrogen and fluorine, where hydrogen is oxidized and fluorine is reduced.

A redox reaction, or reduction-oxidation reaction, involves a transfer of electrons between two species. An example of a redox reaction is the reaction between hydrogen and fluorine:

H2 + F2 → 2HF

In this reaction, hydrogen is oxidized (loses electrons) and fluorine is reduced (gains electrons). Hence this is a redox reaction. You can often identify redox reactions by looking for changes in oxidation states of elements in a reaction.

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Answer:

3

Explanation:

The constant is 3 because it has no variable attached to it. It is constantly 3 despite any change in variables' values.

Answer:

Explanation:

Data Given:

Predict place of element in the periodic Table having following properties

mass number = 304 amu

Ionization energy = very low

bonds = easily bond with other elements

melting point = 50.1° C

electronegativity = smallest    

Atomic radius = largest

metallic character = great

color =  silver  

Periodic Table is the table where elements were placed based on their atomic number.

In 1913 Mosley construct the periodic table according to their atomic number.

Modern Periodic Law :

the physical and chemical Properties of the elements are the periodic functions of their atomic number.

Atomic Number:

Atomic number is the number of electron or proton, denoted by Z

                Z = e or P

Atomic Mass:

Atomic mass is the number of proton plus neutron in the nucleus. it is denoted by A.

              A = P + N

Atomic number is almost half of the atomic mass for majority of the element.

Periodicity of periodic Table:

properties of the element repeat itself at certain interval.

Periodicity of Properties is as follow

1. Ionization energy:

The Ionization energy increase from left to right and decreases down the group.

2. Electronegativity:

E.N increase from left to right and decreases down the group.

3. metallic character:

Metallic character increase down the group and decrease from left to right. metals have metallic color, bristle and shiny surface.

4. non-metallic character

Non-metallic character decreases down the group and increases from left to right.

5. Melting point and boiling Point:

Melting point and boiling Point increases when the metallic character increase and decreases when the metallic character decreases.

6. Atomic radius :

Atomic Radius decrease from left to right and increases from top to bottom as shells are added.

Now keeping in mind all above points, to predict the place of the atom whose properties are given.

Answer:

chlorine has higher ionization than carbon

Explanation:

Chlorine is only one row below carbon, but it is three columns to the right in this case the IP of chlorine would be predicted to be greater than the IP of carbon.

Answer:

Na, valency 1.

Explanation:

Na -sodium.

This element is in the 1A group, so it has 1 electron on the last (valent) level.

So, only 1 electron can participate in forming chemical bond, and therefore the valency of Na is 1.

Final answer:

Sodium (Na) is the element in group IA and the 3rd period, and it has a valency of 1 because it has one valence electron that it can lose to form a +1 cation.

Explanation:

The element that lies in group IA and the 3rd period of the periodic table is Sodium (Na). The valency of sodium is 1, which refers to its ability to combine with other atoms and ions. This valency is because sodium falls in group IA, where the elements have one valence electron that they can lose to form a cation with a +1 charge. The group number for elements in groups 1 and 2 directly correspond to their valences, which is why sodium has a valency of 1.

Answer:

1 atm  

Explanation:

The normal boiling point of a liquid is temperature at which the vapour pressure of the liquid equals 1 atm.  

If the normal boiling point of cyclohexane is 81.0 °C, the vapour pressure of the liquid is 1 atm.

The graph below shows that the vapour pressure of cyclohexane reaches 1 atm at about 81 °C.

Answer:

temperature 3000 km below the surface of earth is varied, it's harder to know the actual temperature, it can be found around 3,000 - 3,500 degrees Celsius

The actual temperature 3000 km below the surface of the Earth is around 3,000-3,500 degrees in the lower mantle.

The mantle of the earth is the mostly-solid bulk of Earth’s interior. The mantle of the earth is that layer that lies between the thin outer layer, the crust, and Earth’s dense, super-heated core.

The mantle of the earth is about 3000 Km thick and creates a whopping 84% of Earth’s total volume. The early mantle is the molten material that surrounded the core.

The rocks that make up the mantle are mostly silicates which are compounds that share a silicon and oxygen structure. The other major kind of rock is magnesium oxide and other mantle elements are calcium, iron, aluminum, sodium, and potassium.

The temperature of the mantle varies from 1000° Celsius near its boundary with the crust to 3500° Celsius near its boundary with the core.

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Answer:

O atom requires 2 electrons to achieve octet structure and in this structure, it is only bonded to one H atom hence only obtaining an additional valence electron. Without a octet structure, the molecule is unstable hence this structure is incorrect. The correct structure should be H-O-H.

Explanation:

Answer:

basic in nature

Explanation:

Litmus Test -

It is the very basic test , used to determine if the solution is acidic in nature or is basic in nature .

There are two type of litmus paper available , i.e. , blue and red .

putting a blue litmus paper turns red ,

and putting a red litmus paper would not show any change .

And , hence it can be concluded that the solution is acidic in nature .

Similarly ,

putting a red litmus paper turn blue ,

and putting a blue litmus paper would not show any change .

And , hence it can be concluded that the solution is basic in nature .

Answer:

1.3005 M

Explanation:

Given that,

Mass of NaCl = [tex]76 \ g[/tex]

Molar mass of NaCl= [tex]22.99+35.45=58.44\ g/mol[/tex]

The formula for calculation of moles,

Moles,

[tex]n=\frac{given \ mass}{molar\ mass}\\n=\frac{76}{58.44} \ g/mol\\n=1.3005\ g/mol[/tex]

Given that volume [tex]=1\ ltr[/tex]

Molarity,

[tex]=\frac{moles\ of\ solute}{litre\ of\ solution} \\=\frac{1.3005}{1}\\ =1.3005\ M[/tex]

Therefore the molarity is 1.3005 M.

Answer:

The atomic mass of Potassium is 39.09 u+-0.0001u and molar mass is  39.09 g,s/mole

Explanation:

Potassium is a metal belongs to group 1 and period 4 whose atomic number is 19 and electron configuration is 2,8,8,1.

The molar mass of Potassium or K is 39.09 g,s/mole and the atomic mass is 39.09 u+-0.0001u. Potassium was first discovered by Humphrey Davey and was first found in the ashes of plants. It also occurs in the mineral sylvite or KCL and is mined as such.

Answer:

Atomic Mass: 39.0983 u.

Molar mass: 39.0983 g/mol

Enzymes are proteins that can change structure under different conditions, assist in body regulation through feedback mechanisms, bind to specific substrates in specific ways, and increase the rate of reactions. However, they are specific to one reaction, found in living organisms, and represent lower activation energy on diagrams.

The following characteristics are true of enzymes:

However, some points are incorrect. An enzyme cannot catalyze a wide variety of reactions - it is specific to one type of reaction. Also, enzymes are not found only in nonliving systems; they are a crucial part of all living organisms. Finally, in energy-reaction diagrams, enzymes represent the lower, not higher, activation energy.

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Answer:

If the electronegativity difference between bonded atoms are too much high ionic bonds are formed if the electronegativity diference is 0.4 or less than 0.4 non polar covalnet bond formed the difference greater than 0.4 polar covalent bond formed.

Explanation:

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.  

Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.

For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion.

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.  

The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive.

30.41 × 10²³ atoms

Explanation:

First we calculate the number of moles of carbon tetrachloride (CCl₄):

number of moles = mass / molar weight

number of moles of CCl₄ = 155.4 / 153.8 = 1.01 moles

Now to find the number of atoms in 155.4 grams of carbon tetrachloride we use Avogadro's number:

if in         1 mole of CCl₄ there are 5 × 6.022 × 10²³ atoms

then in   1.01 moles of CCl₄ there are X atoms

X = (1.01 × 5 × 6.022 × 10²³) / 1

X = 30.41 × 10²³ atoms

Learn more about:

Avogadro's number

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Answer:

87.08 W

Explanation:

Power expended by the boy is power needed/ power experienced to/by the wagon throughout this process of pulling.

When the force F is constant and the angle between the force and the displacement s is θ, then the work done is given by W = Fs cos θ.

Assuming that the force and displacement of the wagon are in the same direction cos(θ)= cos(0)= 1

So, W= 38 * 550 (SI units)

W=20,900 J

[tex]Power = \frac{Work done}{Time taken}[/tex]

Power = [tex]\frac{20,900}{240}[/tex]

87.08 W

Answer:

The whole answer is 87.08 but rounding to 2 number its 87

Explanation: