Write the symbol for every chemical element that has atomic number greater than 70 and atomic mass less than 181.2 u.

Electronegativity

The tendency of an atom to pull electrons towards itself is called electronegativity.

It is the tendency of an atom to attract bonding pair of electrons towards itself. These atoms which are more electronegative are able to bear a negative charge and be stable.

Unlike electropositive elements which tend to lose electrons , electronegative elements hold on tightly to the electrons.

The electronegativity is measured using the Pauling Scale where the most electronegative element of the periodic table, Fluorine , is given a value of 4 and the rest of the elements have values lower than 4 according to the trends followed by their groups and periods.

The least electronegative element of the periodic table , Cesium has a value of 0.7 on the Pauling Scale.

Electronegativity increases when we move from left to right in the periodic table and it decreases (in general) when we move down the group.

(To know more about Electronegativity: https://brainly.in/question/5742635 )

It is a good idea to put input values and output values into separate sheets when solving a complex problem if it improves readability and usability. this statement is false.

The definition of a problem is something that needs to be resolved or an unpleasant or undesirable condition that needs to be corrected. An example problem is an algebraic equation. An example problem is when it's raining and you don't have an umbrella.

The most common meaning is a diplomatic alternative to "problem". The word "problem" can be too negative, especially in the world of politics and business. It focuses on the bad side of things and suggests that someone made a mistake. The main difference between a task and a problem is that a task is a difficult task that a person wishes to complete, whereas a problem is difficult to manage, understand, and impedes an individual's progress.

Learn more about the problem  here

https://brainly.com/question/23945932

#SPJ4

10 mL of 0.1 M NaOH  is equal to 1 equivalent of base, if titrating 10.00 mL of 0.1 M amino acid.

Given :

0.1 M NaOH

0.1 M Amino acid

10.00 mL volume of Amino acid

            R-CH(NH₂)-COOH + NaOH → R-CHNH₂Na + H₂O

In this case, end factor = 1 and It is 1 mole / 1 mole ratio

Since, the concentration of amino acid and NaOH are same, that is 0.1 M.

   Concentration of amino acid = concentration of NaOH

                                          0.1 M = 0.1 M

Therefore, 10 mL of NaOH is required to neutralize 10 mL of amino acid and the end factor is equivalent to 1.

Hence, The volume of 0.1 M NaOH is equal to 1 equivalent of base.

To learn more about titration,

brainly.com/question/14151679

#SPJ4

Answer:

Correct answer is “a reaction occurs” because in the readings it says specifically chemical changes can be reversed but it’s not easy.

Explanation:

The mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.

The law of conservation of mass states that the mass of a substance can neither be created nor destroyed.

This law further explains that in a chemical reaction, the mass of the reactants must equal the mass of the products.

According to this question, sulfide is formed when copper and sulfur are heated together. In a reaction, 130 g of copper reacts with 45 g of sulfur.

However, after the reaction is complete, 8.0 g of unreacted sulfur remain. This suggests that the mass of sulfide produced is as follows:

(130g + 45g) - 8g = 167g

Therefore, the mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.

Learn more about law of conservation of mass at: https://brainly.com/question/13383562

#SPJ1

Response: 26.3 nm

A proton is moving at a speed of 0.30 mm s-1.

if the uncertainty in its momentum is to be reduced to 0.0400 per cent

0.04% of 0.3 Mms-1 = delta v.

= 1.2*10^-4 Mm/s

= 1.2*10^-4*10^6 m/s

delta v= 120 m/s

delta x *m*delta v=h/4pi

delta x*(1.67*10^-27)*120 = 6.626*10^-34/ 4pi

delta x = 2.63 *10^-10

delta x = 26.3 nm

if the uncertainty in its momentum is to be reduced to 0.0400 per cent, 26.3 nm will be the uncertainty.

Learn more about proton here:

https://brainly.com/question/1252435

#SPJ4

In the complete combustion of 1.60 moles of benzene, C6H6, 12 moles of oxygen, O2, is consumed.

Combustion is defined as the process of burning something. In chemistry, combustion refers to the chemical process between a fuel and an oxidant, usually oxygen to produce heat and light in the form of flame.

In a complete combustion, oxygen is sufficient to react with any hydrocarbons to produce carbon dioxide and water.

Balancing the combustion reaction of benzene, we have:

2C6H6 + 15 O2 = 12CO2 + 6H2O

Based on the balanced combustion reaction above, 2 moles of benzene requires 15 moles of oxygen to have a complete combustion.

If we have 1.60 moles C6H6,

moles O2 = mole ratio x mole of benzene

moles O2 = (15 moles O2/2 moles C6H6) x 1.60 moles C6H6

moles O2 = 12

To learn more about combustion: https://brainly.com/question/9913173

#SPJ4

The frequency of a radio wave with an energy of 8.3 x 10-24 J is 1.257 ×10¹⁰ Hz

For the calculation of energy, we know that

E = h[tex]v[/tex]

where. E is energy

h is planks constant

and [tex]v[/tex] is the frequency.

thus, E = 8.3× 10⁻²⁴ J

and h = 6.6 × 10⁻³⁴ Js.

Now, putting values in the formula we get,

8.3× 10 ⁻²⁴ = 6.6×10 ⁻³⁴ × [tex]v[/tex]

thus, [tex]v[/tex] = 8.3 × 10⁻²⁴ / 6.6 ×10⁻³⁴

[tex]v[/tex] = 1.257 ×10¹⁰ Hz

To know more about frequency visit the link:

https://brainly.com/question/14316711?referrer=searchResults

#SPJ1

One of the basic building blocks of matter, which cannot be broken down by chemical means is an element.

The first chemical element is hydrogen (atomic number is 1) and the last is oganesson (atomic number is 118).

Elements are scheduled in Periodic table, ordered by their atomic number.

Other example, krypton is a chemical element with symbol Kr and atomic number 36.

Krypton has 36 electron and 36. It is noble gas (group 18).

Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.

More about chemical element: brainly.com/question/28376204

#SPJ4

Calcium ions=0.502 mol, nitrate ions= 1.004 mol,oxygen atoms =3.012 mol.

Calcium nitrate Ca(NO3)2 = 0.502 mol

the required equation for the given question is below:

Ca(NO3)2 —-> 2N03-  + Ca2+

contains :2 nitrate ions per mole of Ca(NO3)2.,

1 calcium ion per mole of Ca(NO3)2.,

6 oxygen atoms per mole of Ca(NO3)2.

Calcium ions therefore equal 0.502 mol,

nitrate ions equal 2 x 0.502 mol

                    = 1.004 mol

oxygen atoms equal 6 x 0.502 mol

                     = 3.012 mol .

Learn more about oxygen here:

https://brainly.com/question/13905823

#SPJ4

Answer:

Sun

Explanation:

he sun is a big ball of burning plasma it cuases light the sun is the seco d hottest object in the universe the sun another fact is we learned the sun isn't even a solid it's bassiclly a ball of energy or a constant flaming ball of plasma hydrogen and heluim if the sun went out we would live in darkness forever not to mention we would frezze to death

The specific gravity of the solution is 1.07, which contains 5.34g for a 5.00ml sample.

Density of a substance is

Density = Mass / Volume

             = 5.34/5

             = 1.07

Density of water = 1

Specific gravity = Density of substance/density of solvent

Specific gravity = 1.07 / 1

Specific gravity = 1.07

Specific gravity, often known as relative density, is the ratio of a substance's density to that of an industry standard.

If a material has a relative density that is less than 1 compared to the reference, it is less dense than the reference; if it is larger than 1, it is denser. Identical volumes of the two substances have the same mass if the relative densities are equal, or exactly 1.

To learn more about specific gravity click the given link

https://brainly.com/question/543765

#SPJ4

Three things wrong with reporting this number are fractional atom, scientific notation and unit of measurement .

1) Decimal fraction of 0.61 is wrong for number of atoms. For number of atoms, whole numbers must be used, not fractional. For example 1, 25 or 565

2) In example like this, large number should be displayed in scientific notation. It depands on the number of significant figures, but this number can be reported as 1.826x10⁸.

3) Number of atoms is not standard for measurement of thickness of the layer. It is better to us nm (nanometers) or some other unit for the lenght.

More about scientific notation: brainly.com/question/10401258

#SPJ4

It is true that methane, which is a greenhouse gas and contributes to global warming.

A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range.

Global warming is rise in the average temperature of the Earth's climate system.

Most often greenhouse gases are carbon dioxide (CO₂) and methane (molecular formula CH₄). These gases come from burning multiple substances: coal, petroleum, plastic and natural gas.

Balanced chemical reaction of combustion of methane:

CH₄ + 2O₂ → CO₂ + 2H₂O

Greenhouse gases are so difficult to measure, because carbone dioxide, methane, chlorofluorocarbons comes from multiple sources, some of which are relatively hard to measure.

More about global warming: brainly.com/question/26402403

#SPJ4

Answer:

It's true

Explanation:

Took the test

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.

If you need to learn more about cycloalkanes, click here

https://brainly.com/question/11085557?referrer=searchResults

#SPJ4

Polypeptides : Peptides are tiny chains of amino acids connected by the peptide bonds.

Function of polypeptides : Polypeptides aid make up proteins by bonding many amino acids conjointly.

Amino acids are organic components that comprises both amino and carboxylic acid functional groups.

Sequence of amino acids are known as polypeptides. The covalent bonds that hold on to amino acids conjointly are known as peptide bonds.

Types of amino acids : nonpolar, polar, negatively charged, and positively charged.

According to question

Linking amino acid monomers together to form a polymer requires the formation of peptide bonds.

To know more about Polypeptides here :

https://brainly.com/question/28270191?referrer=searchResults

#SPJ4

Explanation:

The graphite anodes are suspended into the brine. During electrolysis, Cl ions are oxidized at the anode and chlorine gas goes out of the cell, while sodium ions are reduced at the mercury cathode forming sodium amalgam. ... Hydrogen gas is obtained as a by–product at the cathode.

Answer:

Mass.

Si Unit Measurement.

volume.

milliliters.

When the renal tubules secrete hydrogen ions into the tubular fluid, they reabsorb sodium at the same time.

What are renal tubules?

The tiny or microscopic structural and functional component of the kidney called a nephron. A renal corpuscle and a renal tubule make up its structure. From the capsule protrudes the renal tubule.

One of the many microscopic tubes in the kidneys that replenishes the blood with nutrients, fluids, and other substances that have been removed from it but are still required by the organism. Urine is created in the renal tubules from any leftover fluid and trash.

To learn more about renal tubule click the given link

https://brainly.com/question/20694510

#SPJ4

Bile suspends lipids in the watery chyme in the small intestine so that lipids can be more easily digested by lipase enzymes.

Enzymes are proteins that accelerate metabolism and chemical reactions in the body. Build some substances and break down others. All living things have enzymes. Our bodies naturally produce enzymes. However, enzymes are also found in finished products and foods.

According to the International Union of Biochemists (I U B), enzymes are divided into six functional classes, classified according to the types of reactions used to catalyze them. The six enzymes are hydrolases, oxidoreductases, lyases, transferases, ligases, and isomerases.

Learn more about   enzymes here

https://brainly.com/question/14577353

#SPJ4

Answer:

Number of protons - number of electrons = charge on ion.

Explanation:

If a chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions then the best approximate value of new pH is 5.

When only pure water is there.

H₂O ⇌ H⁺ + OH⁻

pKw = pH + pOH

14 = pH + pH ( This is because the value of pH and pOH is same in water and we need to consider pH here.)

14 = 2pH

pH= 14/2 = 7

So, pH of pure water is 7.

Concentration of hydrogen ions in pure water can be calculated using the equation

pH = -log[H⁺]

7 = -log[H⁺]

[H+] = 10⁻⁷ M

So, the concentration of hydrogen ions in pure water is 10⁻⁷ M.

Now, the chemist added a chemical to this pure water such that there is   100- fold increase in concentration of hydrogen ions.

So, the new concentration of hydrogen ions is calculated as shown below.

[H⁺] = 100 ×10⁻⁷ M

      = 10⁻⁵ M

The new concentration of hydrogen ions is 10⁻⁵ M.

Now, the new pH can be calculated using the formula

pH  = -log[H⁺]

      = -log[10⁻⁵]

      = -×-5log[10]        

       = 5×1

       = 5

So, the new pH value = 5.

To know more about pH here

https://brainly.com/question/2288405?referre

#SPJ4

Answer:

GOLDEN TRICK

Explanation:

GO TO ND ASK.

MARK 5 STAR FOR THIS BRILLIANT ADVICE.

The Haber process is typically carried out at a temperature of approximately [tex]500^{0}C[/tex]. The rate of the forward reaction would be decreased if the temperature were lowered to [tex]100^{0}C[/tex].

For every [tex]10^{0} C[/tex] increase in temperature, most reactions double in rate. On the other hand, a temperature that is too low cannot be used because the rate of the reaction will be significantly slowed. As a result, a compromise temperature  [tex]450^{0}C[/tex] is used, which is high enough for the rate to be quite fast but low enough to yield a relatively high ammonia yield. This reaction takes place at a pressure of 200 atm. 

Higher temperatures accelerate the rate of reaction. We've seen that when reactions are carried out at a higher temperature, the rate of reaction increases. A higher temperature would allow the Haber process to occur more quickly.

Temperature increases typically increase the rate of reaction. The average kinetic energy of the reactant molecules increases as the temperature rises. As a result, a larger proportion of molecules will have the minimum energy required for an effective collision.

Learn to know more about the Haber process at

https://brainly.com/question/21867752

#SPJ4

Rutherford proposed the atomic model nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant.

The atomic nucleus is the tiny center of an atom that contains practically all its mass. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay. Complete step by step answer we must know that the nuclear theory of the atom was put forward by Rutherford. the law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.

Know more about nuclear theory

https://brainly.com/question/28500137

#SPJ4

Water is most  polar solvent that is used for the process of re-crystallization and Ethanol is less polar than water .  Ethanol is miscible with both water and hexane.

Water acts as a polar solvent because it can attracted to either the positive or negative electrical charge on the solute .Hence, water is most polar solvent. Ethanol is less polar to water but  very polar molecule due hydroxy group, which forms hydrogen bond with other molecules.Hexane is a non polar compound.

The two liquids that mix completely together are called as miscible liquids.Ethanol is miscible with water and hexane both.water and ethanol both are the pair of miscible liquids because ethanol and water can mix together completely and we get a clear colorless liquid.ethanol can mixed in water in any proportion without any limit.

To learn more about Miscible liquids here

https://brainly.com/question/2193479

#SPJ4

Dendrites -> Soma -> Axon -> Terminal buttons

is the actual order that information follows as it travels through a neuron

Neurons are messengers of information. Between various brain regions and between the brain and the rest of the nervous system, information is transmitted using electrical impulses and chemical signals. Without the action of neurons and their supporting cells, the glial cells known as oligodendrocytes and astrocytes, humans would not be able to think, feel, or act.

A cell body, an axon, and two extensions called a dendrite make up the three basic components of a neuron. There is a nucleus inside the cell body that regulates the cell's functions and houses its genetic material. The axon, which resembles a long tail, delivers signals from the cell. Dendrites serve as the cell's messengers and resemble the tree's branches.

Learn more about Neurons

https://brainly.com/question/11538106

#SPJ4

An isotope of sodium (Na) has a mass number of 22 it have 11 neutrons

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. protons are the positively charged particles which are present in the nucleus of an atom. a neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. here sodium (Na) has a mass number of 22 so, in that sodium 11 proton are present and 11 neutron are present.

Know more about isotope of sodium

https://brainly.com/question/28500102

#SPJ4

In the bottle active ingredient are 1.9mL

The concentration in percent by volume can be expressed in the volume of the solute in mL per 100 mL of the solution. as such for a cough syrup with a concentration of 5.00 percent by volume, for every 100 mL of the solution, there are 5.00 mL of the active ingredient. from this the volume of the active ingredient in 38.0 mL of the cough syrup will be calculated as:

Volume of active ingredient = 38.0 mL × 5.00mL / 100mL = 1.9ml

Know more about volume

https://brainly.com/question/28500141

#SPJ4