What is the name for a material with a free electron in its valence ring that allows electricity to flow freely?

The number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

Atomic number of an element is the number of protons in an atom of the element while the atomic mass is the sum of the protons and neutrons in the atom.

The electron number is equal to the number of protons in a neutral atom.

According to this question, the isotope of an element has an atomic number of 79 and a mass number of 200.

Therefore, the number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

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The feature of object-oriented computing is an encapsulation of states. The correct option is b.

Object-oriented computing, the short form, is OOP. A computer programming paradigm known as object-oriented programming (OOP) arranges the architecture of software around data or objects rather than functions and logic.

An object is a data field with particular characteristics and behavior. It contains data and codes. It is stored in the form of a procedure. Furthermore, it is a programming paradigm.

Thus, the correct option is b. encapsulation of states.

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In 1904, J.J. Thomson published the Thomson model of the atom. The plum pudding model is often referred to as Thomson's model.

In 1897, he also made the electron discovery. Scientists Rutherford and Bohr subsequently refuted this theory. According to J.J. Thomson, an atom is a positively charged sphere with embedded negatively charged electrons.

Neils Bohr disproved it by demonstrating that any atom's mass is centred in its positively charged centre, while negatively charged electrons orbit the positive centre. In highly quantized energy levels, according to Bohr's theory, electrons orbit an atom's nucleus rather than being incorporated into it.

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Answer: because acid and water react in a vigorous exothermic reaction, releasing heat, sometimes boiling the liquid.

The general molecular formula for alkanes is cnh2n 2. The general molecular formula for cycloalkanes with two rings CnH2n−2.

Cycloalkanes are hydrocarbons with a ring type structure. The reason of ring formation is because they are saturated compounds. The general formula of the cycloalkanes is CnH2n where n is the number of carbon atoms.

cyclopentane, Cyclobutane, cyclohexane, and cycloheptane, cyclooctane are some example of cycloalkanes and Cyclopropane is considered one of the smallest cycloalkanes.

Cycloalkanes have a lot of uses. They are used in the medical industry for the production of drugs. These compounds are also used in hair and food industries.

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Answer:

C. to the left of the arrow

Explanation:

The reactants (the chemicals that initiate the chemical reaction) are represented on the left, while the products (the substances that result from the reaction) are represented on the right. An arrow sign ("→" commonly read aloud as "yields") separates the two.

Sorry if I'm wrong

Answer: C

Explanation:

C

There are thousands of hydrogen atoms so together they can let off or group up to form all four colors.

Hydrogen is a chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. Under standard conditions, hydrogen is a diatomic molecular gas of the formula H2. It is colorless, odorless, tasteless, non-toxic, and highly flammable.

Hydrogen is an energy carrier that can be used to store, transfer, and deliver energy generated from other energy sources. Hydrogen fuel can be produced today by several processes. The most commonly used methods today are natural gas reforming (a thermal process) and electrolysis. It is found in the Sun and most stars, and the planet Jupiter is composed primarily of hydrogen. On Earth, hydrogen is most abundant as water. As a gas in the atmosphere, it is present in trace amounts, less than 1 ppm by volume.

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The mass of Calcium required to complete this reaction is 4.008 g.

In the given reaction mass of product after completion of reaction is 13.614 g that means total mass of constituents before reaction should also be 13.614.

So,

mass of Ca + mass of O₂ + mass of S = mass of CaSO4

Ca + 6.400 g + 3.206 g = 13.614 g

mass of Ca = 13.614 - 9.606 = 4.008 g

Therefore, by law of conservation of mass 4.008 g of Ca is required for the completion of the reaction.

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The reactant in excess is Al (s)

The mass of remaining surplus reactant is 8.76 g

According to question

4 moles of aluminium reacts with 3 moles of oxygen, to make 2 moles of alumina.

Molar mass Al: 26.98 g/m

Molar mass O2: 32.00 g/m

Mass / Molar mass: Moles

20 g Al / 26.98 g/m = 0.741 moles 10 g O2/32.00 g/m 0.312 moles =

Let's find out the limiting reactant and reactant in surplus by rules of three: the 4 moles of Al reacts with 3 moles of O2

0.741 moles of Al reacts with (0.741.3)/4 = 0.555 moles

Now we know that are needed 0.555 moles of O2 to consume all the Al but we only have 0.312 moles of O2.

The O2 is the limiting reactant, so the Al is the reactant in excess.

Let's make another rule of three

3 moles of O2 reacts with 4 moles of Al

0.312 of O2 reacts with (0.312 .4)/3 = 0.416

We need 0.416 moles to consume all the O2 and we have 0.741 moles of Al.

When we use 0.416 moles from 0.741 it remains 0.325

0.325 moles . 26.98 g/m = 8.76 grams

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Suppose we heat a 4. 31 g sample of a Na2Co3 hydrate. after thorough heating, the mass of the compound is 3. 22 g based on the data, Na₂CO₃ • 2H₂O for the hydrate we start with this formula.

Here compound are Na₂Co₃ then mass of compound is 3.22g and molar mass is 105.98g/mol

Moles of compound (anhydrate Na₂CO₃) = mass / molar mass = 3.22 g / 105.98 g mol = 0.0304 mol mass

So here compound Na₂Co₃ are given and we start with formula Na₂CO₃ • 2H₂O  for the hydrate.

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The most appropriate answer among the option is a polypeptide with a primary sequence it contains four nonpolar neutral residues.

What is polypeptide?

A longer, unbroken, continuous peptide chain is known as a polypeptide. Peptides therefore belong to the wide chemical families of biological polymers and oligomers, along with nucleic acids, oligosaccharides, polysaccharides, and others.

A polypeptide with typically more than 50 amino acids is referred to as a protein. One or more polypeptides with a physiologically functional structure make up a protein. Proteins commonly interact with other proteins, other macromolecules like DNA or RNA, or intricate macromolecular complexes.

Amino acids that have been incorporated into peptides are called residues. A water molecule is released as a result of every amide connection.

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The independent variable is the type of liquid and the dependent variable growth of the plants.

An experiment is used to establish the relationship between causes and effect in each of the following cases, let us determine the dependent and independent variable.

1) The independent variable is the type of liquid and the dependent variable growth of the plants. The constants are the plants and the land. A valid hypothesis is; "The growth of the plants depends on the type of liquid used to water the plants"

2) The independent variable is the mode of transport and the dependent variable is the time taken to reach the market. The constant is the distance covered. A valid hypothesis is; "The time taken to arrive at the grocery store depends on the mode of transport used"

3) The independent variable is the kind of app and the dependent variable is the  battery life. The constant is the phone used while the hypothesis is; "Certain apps delete the battery faster than others"

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Answer:

h20

Explanation:

science, 3 hydrogen and one oxygen make h2o

[tex]H_3O^+[/tex], hydronium ion is the name given to this molecule. Therefore, the correct option is option B among all the given options.

The smallest recognisable unit which which a pure material may be split while retaining its composition and chemical characteristics is a molecule, which is a collection of two or more atoms. Until portions consisting of tiny molecules are reached, the division of a sample for a substance onto progressively smaller parts does not result in a change with respect to its composition as well as its chemical characteristics. [tex]H_3O^+[/tex], hydronium ion is the name given to this molecule.

Therefore, the correct option is option B among all the given options.

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Answer:

Explanation: Solid to Solid mixtures

1. Iron+Sulphur

2. Pottasium Nitrate+Potassium Chlorate

3. Ammonium Chloride+Sodium Chloride

Solid to Liquid Mixtures

1. Salt+Water

2. Sand+Water

3. Calcium Carbonate+Water

Liquid to Liquid Mixtures

1. Alcohol+Water

2. Oil+Water

3. Kerosene+Water

Liquid to Gas Mixtures

1. Hydrogen+Oxygen

2. Hydrogen Chloride+Nitogen

3.Air (Air is a mixture of many gases)

Answer:

Lu

Hf

Ta

Explanation:

Lu- Lutecium
Atomic Number- 71
Atomic Mass-174.967

Hf- Hafnium
Atomic Number-72
Atomic Mass178.492

Ta- Tantalum
Atomic Number-73
Atomic Mass-180.948

The chemical elements that meet the criteria are Hafnium (Hf) and Tantalum (Ta).

The atomic number represents the number of protons in the nucleus of an atom, while the atomic mass represents the total mass of protons and neutrons in the nucleus of an atom.

Elements with atomic numbers greater than 70 are located in the bottom rows of the periodic table, known as the "lanthanides" and "actinides."

So, Atomic Number > 70 and Atomic Mass < 181.2 u

1. Hafnium (Hf) - Atomic Number: 72, Atomic Mass: 178.49 u

2. Tantalum (Ta) - Atomic Number: 73, Atomic Mass: 180.95 u

3. Tungsten (W) - Atomic Number: 74, Atomic Mass: 183.84 u

4. Rhenium (Re) - Atomic Number: 75, Atomic Mass: 186.21 u

Therefore, the chemical elements are Hafnium (Hf) and Tantalum (Ta).

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If a capacitor is overcharged, the electrons from the terrible plate may be pulled through the insulation to the high-quality plate. the capacitor is stated to be shorted.

while you join a capacitor to DC voltage, the capacitor will price to this voltage, and the charging current will drop to zero.

You need to make certain the voltage isn't better than the capacitor’s  Shorting.

On AC, the capacitor will comply with the voltage, w/a put off. again, you need to make sure the voltage rating of the capacitor fits the voltage(In this situation peak voltage).

If the voltage is higher in either case-the capacitor may short.

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The electrons in the atom's third energy level that are involved in chemical reaction are six in number.

Sulfur is an element that can be found in group sixteen of the periodic table. It has a valency of two because it has six electrons in the outermost shell and shares two more electrons with another element in order to form a covalent bond.

There are three electron shells that could be found in sulfur. The first shell has two electrons, the second shell has eight electrons while the last shell has six electrons.

As such, the electrons in the atom's third energy level that are involved in chemical reaction are six in number.

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yes ions add another atom

ions are electrically charged particles that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.

Ionic bonds are defined as connections between atoms in which electrons are primarily transported from one atom to another. Since there is always some electron sharing between atoms, we say largely because the sharing in ionic bonds is relatively uneven. The bond has a stronger ionic character the more unequally the electrons are shared.

Between a metal and a non-metal, ionic bonding form. Ionic bonds, as opposed to covalent ones, involve the transfer of valence electrons between atoms.

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yes Ions can be combined with other atoms to create new elements or compounds.

However not all ions are atoms, an atom can be an ion.

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Answer:

27.2 kg

Explanation:

13.6 * 2 L of commercial flask of mercury = 27.2 kg.

Hope this helps! Have a good day! :D

The complete hydrolysis of a protein produces a mixture of free amino acids.

Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.

No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether. Whole eggs are relatively pH neutral, but egg whites are one of the few foods that are naturally alkaline, with an initial pH of as high as 7.6 when eggs are laid, but the alkalinity increases as eggs age and reach increases. the pH of 9.2.

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2 linear positional isomers of nonene are there

Nonene have molecular formula is C₉H₁₈ called nonene no of possible isomers are 35 but including branched there are 35 isomers of nonene while linear compound mean only straight chain compound here straight chain compound are only 2 common name for nonene is non-1 ene there are so many isomers are seen in nonene Straight chain, Octanes, Heptanes,3,1 Dimethylheptanes,3,2 Ethylheptanes, Hexane, 4.1 Trimethyl. 4.2 Methyl+Ethyl, Pentane. in nonene class of organic compounds known as unsaturated aliphatic hydrocarbons. these are aliphatic hydrocarbons that contains one or more unsaturated carbon atoms. These compounds contain one or more double or triple bonds.

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In the experiment performed on the compost:

Variables in an experiment are factors that are under the control of the researcher and which brings about changes in the result of the experiment.

There are three types of variables in an experiment, they are;

The independent variable is the variable which affects the result of the experiment by controlling the dependent variable.

The dependent variable changes as a result of changes in the independent variable.

The constant variable is kept constant or unchanged by the researcher.

Considering the experiment performed on the compost:

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To prepare 128.2ml of a 0.364 M aqueous solution of NaCl.the mass in grams, of NaCl need to use to make the solution is 2.723 gm.

Molarity is defined as the no. of moles of solute per liter of solution.

Here,

Molarity =  moles of solute / Liter of solution

0.36 M solution will contains 0.364 moles of NaCl.

therefore, volume of solution in L =  ( 128.2 / 1000 ) L × 1 L

                                                 = 0.1282 L

that means, it will contain, no. of moles of NaCl

= (0.1282 L of solution × 0.364 ) / 1 L of solution      

= 0.0466 moles of NaCl

now, molar mass of NaCl  = 58.44 g/mol    

so, 1 mol of NaCl has a mass of  58.44 g/mol

therefore, 0.0466 moles of NaCl will have mass of

= ( 0.0466 moles of NaCl × 58.44 g ) / 1 mole of NaCl

= 2.723 g

Thus,To prepare 128.2ml of a 0.364 M aqueous solution of NaCl .the mass in grams, of NaCl need to use to make the solution is 2.723 gm.

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2.50 x 10⁻³ mol naoh are present in 25.0 ml of a 0.1000 m naoh solution

Here Molarity formula is used to find moles in solution

Molarity = no of moles of solute/volume of solution

M= molarity, V = volume , n= no of moles

M=0.1000m , V=25.0ml  , n=?

M=n/v(ml)×1000

n=MV/10³ = 0.1000×25.0/10³ = 2.50 x 10⁻³ mol

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One type of chemical reaction is combustion. Carbon dioxide is produced when carbon combines with oxygen in the combustion of charcoal, for example. Carbon and oxygen are reactants, or the chemicals that initiate a chemical reaction. The process produces carbon dioxide. However, this change is just physical.

As the constituent molecules' composition remains unchanged: 11.19% hydrogen and 88.81% oxygen by mass. Physical change can be classed as either reversible or irreversible. When we burn coal, a chemical reaction occurs, and new substances such as carbon dioxide and water are formed. Burning coal is considered as a chemical change since it results in the production of new compounds.

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Ionization energy : the minimum amount of energy demands to detach an electron from an isolated atom.

Ionization energy also known as potential energy.

The charge of the nucleus increases from side to side in a row and so there is an increase in the attraction in the middle of the nucleus and the surrounding electrons.  As we move from side to side in a periodic table from left to right, the nuclear charge increases. This is because of increasing nuclear charge, which concludes in the topmost electron being more strongly leap to the nucleus.

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The molar mass of compound tells you the mass of 1 mole of that substance. The percent by mass of y in x₂y₂ is 57.14%

Molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×1023 molecules

In compound x₂y, the percentage mass of x is 60%. The percentage mass of y is 40 %. Let the compound  weighs M , 2 units of x weigh 0.6M, 1 unit of x weighs 0.3* M and one unit of y weight 0.4*M.

In the compound x2y2, the percentage mass of y is

0.4*2 ÷ (0.4*2 + 0.3* 2 ) = 8 ÷ (.8+.6) = 0.8 ÷ 1.4 = 57.14 %

The percent by mass of y in x₂y₂ is 57.14%.

Thus, the percentage by mass of y in x₂y₂ is 57.14.

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The mass of liquid mercury that can fill glass tube is 680.365 gm.

We know that ,

Volume of cylinder = π[tex]r^{2} h[/tex]

where r is the radius of cylinder and h is the height

Here diameter of glass tube is 16mm

Thus the radius r = 8 mm

                           = 0.8 cm

Volume of glass tube = π [tex]0.8^{2}[/tex][tex]*25[/tex] [tex]cm^{3}[/tex]

Density of mercury given is [tex]13.53gm/cm^{3}[/tex]

We know that

Density =  Mass / Volume

∴ [tex]13.53gm/cm^{3}[/tex]  =  Mass/ π[tex]0.8*0.8 * 25[/tex]

Mass =  13.53 *π0.8*0.8*25

         = 680.36 gm

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