The pOH of a solution is 4.2. Which of the following is true about the solution?

It is acidic and has a pH of 6.8.
It is acidic and has a pH of 9.8.
It is basic and has a pH of 6.8.
It is basic and has a pH of 9.8.

Answer:

The answer is C. Species

Answer: Species

Explanation:

If two animals can reproduce and  the offspring that is produced is also fertile then it can be said that they are members of the same species.

The population of the same species live together in search of food, mate with each other to produce offspring, compete for food and compete for other resources.

It does not matters that the organism live in the same place or different, if they mate and produce a fertile offspring they belong to the same species.

Answer:

the answer is a

Explanation:

According to the pH scale, baking soda is a weak base while bleach is a strong base. Therefore, option (A) is correct.

An acid is any substance that is capable of donating a proton to another substance.  A base is a molecule or ion that is capable to accept a hydrogen ion from an acid.

Acidic substances are generally identified by their sour taste. An acid is commonly a molecule that can donate an H⁺ ion and can be energetically favorable after a loss of H⁺ ion. Acids are also known to turn blue litmus paper into the red.

Bases are characterized by a bitter taste and a slippery texture. A base t can dissolve in water is also referred as an alkali. When bases chemically react with acids, they yield salts and water as products. Bases are also known to turn red litmus paper into the blue.

The pH value of the acids lies between 0 to 7 and the pH value of the acids lies between 7 to 14. Baking soda is a weak base that has a pH value of around 8 to 9 and bleach is a strong base that has a pH value of around 13.

Learn more about acids and bases, here:

https://brainly.com/question/3941445

#SPJ5

Answer:

"A" Atomic number

Explanation:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number.

The modern periodic table is organized by the atomic number of each element.

The atomic number of an element represents the number of protons in the nucleus of its atoms. Each element has a unique atomic number, which determines its position in the periodic table. The periodic table is arranged in order of increasing atomic number from left to right and top to bottom.

The organization by atomic number is important because it reflects the fundamental property of an element. Elements with similar chemical behaviors are grouped together in the same columns, known as groups or families. These groups have similar valence electron configurations, which determine the chemical properties of the elements.

For example, all the elements in Group 1, also known as the alkali metals, have one valence electron and tend to be highly reactive. Elements in Group 18, known as the noble gases, have a full valence electron shell and are generally unreactive.

The periodic table also organizes elements based on their atomic weight, but this is not the primary factor in determining the arrangement. Atomic weight is the average mass of all the isotopes of an element, taking into account the relative abundance of each isotope. However, the atomic number provides a more precise and unique identifier for each element.

In summary, the modern periodic table is organized by the atomic number of each element, which reflects the number of protons in the nucleus. This arrangement helps group elements with similar chemical properties together, making it easier to study and understand the behavior of different elements.

To know more about atomic number:

https://brainly.com/question/16858932

#SPJ4

Fossils are most likely to be found in sedimentary rock because to become fossilized an organisms must be buried quickly before it is destroyed by erosion or eaten by other organisms.

Rocks are naturally formed consolidated material composed of grains of one or more minerals.

There are mainly three types of rocks.

Thus, fossils are most likely to be found in sedimentary rock.

To learn more about sedimentary rock, refer to the link below:

https://brainly.com/question/10709497

#SPJ2

Answer:

Explanation:

Ions:

When an atom lose or gain electron ions are formed.

There are two types of ions anion and cation.

Anion:

When an atom gain electron negative charge is created and anion is formed.

X + e⁻  → X⁻

Cation:

When an atom lose electron positive charge is created and cation is formed.

X   →  X⁺ + e⁻

Electron:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e-

Mass= 9.10938356×10-31 Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

He constructed the glass tube and create vacuum in it. He applied electric current between electrodes. He noticed that a ray of particles coming from cathode to wards positively charged anode. This ray was cathode ray.

Properties of cathode ray:

The ray is travel in straight line.

The cathode ray is independent of composition of cathode.

When electric field is applied cathode ray is deflected towards the positively charged plate.

Hence it was consist of negatively charged particles.

Neutron and proton:

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P+  

Symbol of neutron= n0  

Mass of proton=1.672623×10-27 Kg

Mass of neutron=1.674929×10-27 Kg

Answer:

SiO2 + 4HF = SiF4 + 2H2O

Explanation:

Answer:hf-4 and 2h20

Answer:

single displacement reaction

Explanation:

Cl2 + 2KI = I2 + 2KCl

This is single displacement reaction.

Answer:

Single displacement reaction

Explanation:

When Potassium Iodide reacts with chlorine, the following reaction occurs

2KI + Cl₂ ⇒ 2KCl + I₂

From the reaction above, it can be deduced that chlorine replaces iodine in potassium iodide to form potassium chloride. This type of reaction is called a single displacement reaction. And it usually occurs when a more reactive element displaces a less reactive element from it's compound.

Chlorine is more reactive than iodine and as such can displace iodine from a solution (just as it is in the equation above).

NOTE: A single displacement reaction is a reaction in which an element (just one) replaces another element in a compound during the course of a reaction.

Answer:

[tex]\rm Au^{3+}[/tex] would likely be the smallest.

Explanation:

In this question, [tex]\rm Au[/tex] likely represents a gold atom.

[tex]\rm Au^{+}[/tex], [tex]\rm Au^{2+}[/tex], and [tex]\rm Au^{3+}[/tex] are gold ions. The plus sign in the superscript shows that these ions are positive. In other words, each is formed when a [tex]\rm Au[/tex] atom loses one or more electrons. The number shows the charge on each of these ions. That's the same as the number of electrons that the [tex]\rm Au[/tex] atom needs to lose before forming this ion. The charge on [tex]\rm Au^{3+}[/tex] is more positive than that on the other two gold ions. As a result, each [tex]\rm Au^{3+}[/tex] ion contains fewer electrons than each of the other two ions.

Consider the electron-cloud model of an atom or an ion. The nucleus is very small and doesn't take up much space. The atom or ion takes space mainly because of the electron cloud that surrounds the nucleus. The nucleus attracts the valence electrons and pulls them inwards. At the same time, the electrons repel each other.

For the same [tex]\rm Au[/tex] nucleus (attractions on the electrons stay the same,) as the number of electrons decreases, the size of the repulsion decreases. As a result, for a series of ions or atoms with the same nucleus, the one with the smallest number of electrons will take up the least space. All four choices involve the [tex]\rm Au[/tex] nucleus. However, since each [tex]\rm Au^{3+}[/tex] particle contains the least number of electrons, it would also be the smallest.

Answer:

give me points ahahahh

Explanation:

Answer:

B. A chart of frequencies of light waves

Explanation:

Answer:

b

Explanation:

Answer:

Mass =  0.89 g

Explanation:

Given data:

Moles of diphenylmethanol = 4.82 mmol

Mass = ?

Solution:

we will convert the mmol into mols.

4.82 /1000 = 0.0048 mol

Molar mass of  diphenylmethanol  = 184.23 g/mol

Formula:

Mass = number of moles × molar mass

Mass =  0.0048 mol × 184.23 g/mol

Mass =  0.89 g

Final answer:

is not a measure of the amount of matter. Molar mass, mole, and molar volume are measures of the amount of matter.

Explanation:

STP

(standard temperature and pressure) is

NOT

a measure of the amount of matter. It refers to a specific set of conditions: a temperature of 0 degrees Celsius and a pressure of 1 atmosphere. It is used as a reference point for comparing and measuring other properties of gases.

Molar mass

is a measure of the mass of one mole of a substance, usually expressed in grams per mole. It provides information about the amount of matter present in a given sample of a substance.

Mole

is a unit of measurement used in chemistry to express the amount of a substance. It represents Avogadro's number (6.022 x 10^23) of particles (atoms, molecules, or ions) in a sample.

Molar volume

is the volume occupied by one mole of a substance at a specific temperature and pressure. It provides information about the amount of space a substance takes up.

Learn more about Measuring the amount of matter

https://brainly.com/question/39247466

#SPJ12

Final answer:

STP (standard temperature and pressure) is not a measure of the amount of matter; it is a set of conditions for standardizing measurements. Molar mass, mole, and molar volume all directly measure the amount of matter in different ways.

Explanation:

The measure that is NOT a measure of the amount of matter among the provided options is STP (standard temperature and pressure). STP is a condition used to standardize measurements, allowing comparisons between different sets of data. It defines a set of conditions (0 degrees Celsius and 1 atm pressure) but does not itself measure the amount of matter. In contrast, molar mass is the mass of one mole of a substance, and thus directly measures the amount of matter. A mole represents a specific number of particles, again a measure of matter. Lastly, the molar volume (22.4 L at STP for gases) gives the volume occupied by one mole of a gas and is also a measure of matter.

Answer:

True

Explanation:

When a base is dissolved in water, the balance between hydrogen ions and hydroxide ions shifts the opposite way. Because the base "soaks up" hydrogen ions, the result is a solution with more hydroxide ions than hydrogen ions. This kind of solution is alkaline.

The claim that an alkaline solution contains more hydrogen ions than hydroxide ions is false. Alkaline solutions actually have a greater concentration of hydroxide ions and a pH higher than 7.

An alkaline solution, also known as a basic solution, has a higher concentration of hydroxide ions (OH-) compared to hydrogen ions (H+) or hydronium ions (H3O+). This is positively correlated with a pH greater than 7, indicating a lower concentration of hydronium ions than pure water and a consequent increase in hydroxide ion concentration.

For instance, in a basic solution like baking soda, the concentration of hydroxide ions exceeds that of hydronium ions, making it capable of neutralizing acids and exhibiting characteristics such as a bitter taste. The molarity of hydronium ions in these solutions is less than 1.0× 10-7 M, and the molarity of hydroxide ions is greater than 1.0 ×10-7 M.

Answer:

Combustion and redox

Explanation:

Magnesium is burned in the presence of oxygen and form magnesium oxide.

The oxidation -reduction also take place that's why the given reaction is redox.

These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

2Mg + O₂  →   2MgO  

the oxidation state of magnesium is changed from 0 to +2 so it get oxidized.

The oxidation state of oxygen is changed from 0 to -2 so it get reduced.

The reaction between magnesium and oxygen is best described as a combustion and redox reaction, with magnesium being oxidized as it burns in the presence of oxygen to form magnesium oxide.

The reaction that best describes the interaction between magnesium and oxygen is a combustion and redox reaction. When magnesium reacts rapidly with oxygen upon ignition, it combines with oxygen from the air to form a fine powder of magnesium oxide, as represented by the chemical equation 2Mg (s) + O₂(g) → 2MgO (s). This process is considered a combustion reaction because magnesium is burning in the presence of oxygen, and it is also a redox reaction because there is a transfer of electrons, with magnesium being oxidized and oxygen being reduced.

Answer:metres

Explanation:It would be best to measure the length of an object in metric system such as millimeter, centimeter, mere etc..

The best unit to measure the length of an object is meters.

Answer: Option A

Explanation:

Length is defined as the distance covered by any object from one end to another end of the object. It can also be termed as single dimension of the object. It is a measuring variable and like all measuring variables, it also has SI unit. The SI unit to determine the length of any object is meter.

So among the given options, cubic meters can't be the correct unit for length because it has three dimensional variable while length is a single dimensional variable. Similarly, kilograms is the unit of weight or mass of any object and kilogram per cubic meter is for density of any object. Thus the best unit for measuring the object's length is meters.

Answer:

N₂ + 3H₂  →  2NH₃

2H₂O →  2H₂ + O₂

CH₄ + 2O₂  →  CO₂ + 2H₂O

Explanation:

A) Make ammonia:

Chemical equation:

N₂ + H₂  →  NH₃

Balanced chemical equation:

N₂ + 3H₂  →  2NH₃

Step one:

N₂   +   H₂      →     NH₃

N = 2                    N = 1

H = 2                    H = 3

Step 2:

N₂   +   3H₂      →          2NH₃

N = 2                              N = 1

H = 2×3 = 6                    H = 3×2 = 6

Step 3:

N₂   +   3H₂      →          2NH₃

N = 2                              N = 1×2 = 2

H = 2×3 = 6                    H = 3×2 = 6

B) separate water:

Chemical equation:

H₂O →  H₂ + O₂

Balanced chemical equation:

2H₂O →  2H₂ + O₂

Step one:

H₂O        →        H₂ + O₂

H = 2                    H = 2

O = 1                     O = 2

Step 2:

2H₂O                →        H₂ + O₂

H = 2×2 = 4                  H = 2

O = 1×2 =2                     O = 2

Step 3:

2H₂O                →        2H₂ + O₂

H = 2×2 = 4                  H = 2×2 = 4  

O = 1×2 =2                     O = 2

C) Combust methane

Chemical equation:

CH₄ + O₂  →  CO₂ + H₂O

Balanced chemical equation:

CH₄ + 2O₂  →  CO₂ + 2H₂O

Step one:

CH₄ + O₂  →  CO₂ + H₂O

C = 1                    C = 1

H = 4                   H = 2

O = 2                    O = 3

Step 2:

CH₄ + 2O₂  →  CO₂ + H₂O

C = 1                     C = 1

H = 4                    H = 2

O = 2×2 = 4          O = 3

Step 3:

CH₄ + 2O₂  →  CO₂ + 2H₂O

C = 1                    C = 1

H = 4                   H = 2×2 = 4  

O = 2×2 = 4         O = 2 + 2 = 4

Answer:

The reaction between zinc and acetic acid is a single-replacement reaction. During this type of reaction basically one element replaces one compound.

The balanced equation for the reaction between zinc and acetic acid is

Zn(OH)_2 +2CH_3 COOH ----> Zn(CH_3COO)_2+2H 2O

Or this might help too!

Balanced Chemical Equation

A balanced chemical equation is defined as the chemical equation which has an equal number of atoms on both sides of the reaction arrow. A balanced chemical equation is based on the law of conservation of mass.

Answer and Explanation:

Below is the reaction between acetic acid and Zinc:  

Z n  +  2 H C 2 H 3 O 2  →  Z n ( C H 3 C O O ) 2  +  H 2

This reaction is an example of a reaction between an acid and a metal. When an acid reacts with a metal, salt, and Hydrogen gas forms. The Hydrogen gas formed here can be tested as it burns with a POP sound.

The reaction between zinc and acetic acid is a single replacement reaction where zinc displaces hydrogen from acetic acid, forming zinc acetate and releasing hydrogen gas.

The reaction between zinc and acetic acid is a type of single replacement reaction, also known as a displacement reaction, a common type of reaction in chemistry. In a single replacement reaction, a more reactive metal displaces a less reactive metal from its compound. Here, zinc is more reactive than is the hydrogen in acetic acid.

During this reaction, zinc will displace the hydrogen atoms from acetic acid, forming zinc acetate and releasing hydrogen gas. The general chemical equation for this reaction is:

2 Zn ( s ) + 2 CH₃ COOH ( aq ) → 2 Zn ( CH₃ COO )₂ ( aq ) + H₂ ( g )

Since zinc is a very reactive metal, when it is placed in an acid like acetic acid or hydrochloric acid, it will undergo a redox reaction where zinc is oxidized, and hydrogen ions from the acid are reduced, resulting in the evolution of hydrogen gas which can be observed as bubbling. Hydrogen gas is a common product when metals react with acids.

Answer: Mg loses two electrons to have an octet. Oxygen gains two electrons to have an octet. The ionic bond between ions results from the electrostatic attraction of opposite charges. The final formula of magnesium oxide is MgO.

Explanation: I am like 97% sure it is correct

Answer: [tex]\Delta H=+127kJ[/tex]

Explanation:

[tex]2AgCl(s)+127kJ\rightarrow 2Ag(s)+Cl_2(g)[/tex]  

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be positive.

As the heat is absorbed the reactants , the reaction is endothermic and [tex]\Delta H[/tex] for the given endothermic reaction will be +127 KJ

The decomposition of silver chloride is an endothermic process that requires 127 kJ of energy, therefore, the ΔH value for this reaction is +127 kJ.

The reaction presented is the decomposition of silver chloride (AgCl) which is an endothermic process, as it requires energy (in this case, 127kJ) to proceed. This is represented by the positive sign in the energy value. The ΔH value or enthalpy change for this reaction can be calculated through some energy changes involved in the breaking and forming of bonds, similar to the example given with HCl. However, since the provided reference scenarios aren't directly relevant to the breakdown of AgCl, we wouldn't be able to ascertain the exact ΔH value for the decomposition of AgCl without further data. Nevertheless, based purely on the given reaction, the ΔH for the decomposition of AgCl is +127 kJ. This indicates that energy is absorbed during the reaction, thus making it an endothermic process.

https://brainly.com/question/20561029

#SPJ11

Answer:

you can divide 3/4 by 1/3

3/4 / 1/3 = 3/4 x 3/1= 6/4 = 3/2

There are 5/6 1/3 cups in 3/4 cup.

To find out how many 1/3 cups are in 3/4 cup, we can use the following formula:

number of 1/3 cups = (total volume)/(volume of 1/3 cup)

Total volume = 3/4 cup

Volume of 1/3 cup = 1/3 cup

Plugging these values into the formula, we get:

number of 1/3 cups = (3/4 cup)/(1/3 cup) = (3/4) / (1/3) = 9/4 / 1/3 = 9/4 * 3/1 = 27/4 = 5/6

Therefore, there are 5/6 1/3 cups in 3/4 cup.

To know more about Volume:

https://brainly.com/question/35468510

#SPJ3

Answer:

F has a larger nuclear charge than[tex]O_2[/tex] account for the fact that the F-ion is smaller than the [tex]O_2[/tex]-ion

Explanation:

The 'effective nuclear charge' of an  polyelectronic atom, denotes the net positive(+ve) charge that experienced by an electron. The "strength of the nuclear charge" can be determined based on the oxidation-number of an atom which determines the number of electron that is lost or gained by elements.

F-ion is smaller when compared with O2-ion because of the larger nucleus charge of the F-ion. This is because of the presence of more protons in F-ion that pulls the electrons on the shell’s outside, thus making it smaller.  

Answer:

x = 5.9

Explanation:

The volume of a gas sample at STP (2.5 L and 273 K) that is heated to 273 degrees Celsius at constant pressure will double to 5.0 L.

To solve this, we'll use Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in Kelvins) when pressure is held constant. The formula for Charles's Law is V1/T1 = V2/T2. The initial volume (V1) is 2.5 L and the initial temperature (T1) is 273 K (which is STP). The final temperature (T2) is 273 degrees Celsius, which needs to be converted to Kelvins by adding 273, resulting in T2 = 546 K.

Now, we can solve for the new volume (V2):

So, when the temperature is raised to 273 degrees Celsius and the pressure remains constant, the new volume of the gas will be 5.0 L.

Answer:

true

Explanation:

Nitrogen is essential to life on Earth. It is a component of all proteins, and it can be found in all living systems. Nitrogen compounds are present in organic materials, foods, fertilizers, explosives and poisons. Nitrogen is crucial to life, but in excess it can also be harmful to the environment.

Answer:

There will be more repulsive force between the electrons.

Explanation:

Electrons contain negative charge.As a result the electron will repulse another adjacent negatively charged electron.

   According to the given question addition of electrons to en energy level without adding more protons will increase the overall negative charge in the the energy level in which the electrons are added.

  This ultimately leads to generate more repulsive force between the electrons.

The water molecules are not completely removed so additional heating is required.

Explanation:

We have the copper (II) sulfate pentehydrate with the chemical formula CuSO₄ · 5H₂O.

molar mass of CuSO₄ · 5H₂O = 159.6 + 5 × 18 = 249.6 g/mole

Knowing this, we devise the following reasoning:

if in       249.6 g of CuSO₄ · 5H₂O there are 90 g of H₂O

then in         8 g of CuSO₄ · 5H₂O there are Y g of H₂O

Y = (8 × 90) / 249.6 = 2.88 g of water

mass of dried CuSO₄ = mass of CuSO₄ · 5H₂O -  mass of H₂O

mass of dried CuSO₄ = 8 - 2.88 = 5.12 g

5.12 g is less that the weighted mass of 6.50 g. We deduce from this that the sample needs additional heating in order to remove all the water (H₂O) molecules.

Learn more about:

hydrates

https://brainly.com/question/10232217

https://brainly.com/question/13450632

#learnwithBrainly

Answer:

2 moles

Explanation:

Let us first start by calculating the molecular mass of Al₂O₃.

The mass of a mole of any compound is called it's molar mass. 1 molar mass 6.02 X 10²³, or Avogadro's number, of compound entities.

Say, 1 mole of Al₂O₃ has 6.02 X 10²³ of Al₂O₃ molecules/atoms. It also has 2*6.02 X 10²³ number of Al atoms and 3*6.02 X 10²³ number of O atoms.

Molecular mass of Al : 26.981539 u

Molecular mass of O: 15.999 u

Therefore, molecular mass of Al₂O₃ is:

= [tex](2*26.981539) + (3*15.999)[/tex] u

= 101.960078 u

This can be approximated to 102 u.

1mole weighs 102 u

So, 2moles will weigh 2*102 = 204 u

Answer:

2 moles

Explanation

Molecular mass of Al : 26.981539 u

Molecular mass of O: 15.999 u

The molecular mass of Al₂O₃ is:

= 101.960078 u

This can be approximated to 102 u.

1mole weighs 102 u

So, 2moles will weigh 2*102 = 204 u

Final answer:

A compound that conducts electricity when dissolved in water is classified as an electrolyte. Strong electrolytes completely ionize and provide many ions, leading to better conductivity. Nonelectrolytes do not produce ions and therefore do not conduct electricity.

Explanation:

A compound that conducts electricity when dissolved in water would most likely be classified as an electrolyte. Electrolytes are substances that produce ions in solution, thereby allowing the solution to conduct electricity. When ionic compounds dissolve in water, they dissociate into cations and anions, which are mobile and can carry electrical charge through the solution. Strong electrolytes dissociate completely, providing a large number of ions, and include most soluble ionic compounds such as NaCl and strong acids like HCl. On the other hand, weak electrolytes only partially ionize in solution and do not conduct electricity as well, such as weak acids and weak bases. Solutions that do not conduct electricity are typically solutions of nonelectrolytes, which consist of molecules that do not produce ions when dissolved, like sugar or ethanol.

Answer:

Larger the size of atom lower will be ionization energy and it become easier to remove the electron.

Explanation:

Atomic radius

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.  Thus less energy is required to remove the electron from atom.

Final answer:

Ionization energy is the energy required to remove an electron from an atom and is related to the atom's ability to lose electrons. It increases across a period due to higher effective nuclear charge and decreases down a group as atomic size increases.

Explanation:

Ionization energy is directly related to how easily an electron can be lost from an atom. It is defined as the amount of energy needed to remove an electron from an atom. As you move across a row on the periodic table, the ionization energies generally tend to increase, which means it becomes more difficult to remove an electron because the effective nuclear charge on the valence electrons increases.

Trends Across the Periodic Table

Elements on the left side of the periodic table can lose electrons more easily, as they require less energy to remove an electron than those on the right side of the periodic table. This is because atoms on the left have fewer protons and a smaller nuclear charge, reducing their ability to hold onto their valence electrons tightly.

Trends Down the Groups

Within a group on the periodic table, the ionization energy decreases as you move down the group. This is due to the atomic radius increasing, which means the outermost electrons are farther from the nucleus and experience less electrostatic pull, making them easier to remove.

The energy required to remove successive electrons from an atom increases, so removing the third, fourth, fifth, and so on, electrons from an atom requires progressively greater amounts of energy, especially when an electron is removed from a filled inner shell.

Answer:

1. The atoms in propane and oxygen rearrange to form other substances after the reaction.

Explanation:

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The burning of propane is also a chemical change because propane and oxygen converted into water and carbon dioxide by rearrangement of atoms.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Lead-205 (Pb-205)

We are given;

We are supposed to identify its product after an alpha decay;

²⁰⁹₈₄Po → ²⁰⁵₈₂Pb + ⁴₂He

Answer:

basically i quess

Explanation:

Answer:

for alkali metals its soft extremely reactive and 1 valence electrons

alkaline earth metals is 2 valence electrons and harder more dense