please answer these questions!

A. An element.

As long as it's on the periodic table, it's always an element.

A compound is made up of two or more elements in a chemical reaction, resulting in covenant and/or ionic bonds.

A homogenous mixture (a solution) is a combination of two or more elements physically without causing a reaction (like salt water or applejuice).

Heterogeneous mixtures are physical combinations that mix but don't appear uniform (think of cereal in milk.)

Answer:

(A) H2CO3 = H20 + CO2

Explanation:

Carbonic acid is formed from carbon dioxide and water so its equation will be

H2CO3 → H2O + CO2

The equation is balanced as same no of atoms of each specie is present both sides

Answer:

A) Ionic bond

___transfer of electrons

B) Covalent bond

___sharing of electrons

C) Metallic bond

___freely moving electrons

The correct match of chemical bonds to its correct description are:

A) Ionic bond - transfer of electrons.

B) Covalent bond - sharing of electrons.

C) Metallic bond - freely moving electrons.

Chemical bonds are the attraction of electrons of different atoms to form a bond. These bonds are the reason for the joining of different atoms and forming of substances and compounds.

There are different types of bonds that are formed according to the different atoms and different types of attraction or joining. These bonds are ionic bonds, metallic bonds, and covalent bonds.

The covalent bonds are the strongest bonds because there is sharing of electrons in them. Ionic bonds transfer electrons to each other. Metallic bonds get the free-moving electrons of the elements.

Thus, the correct match is

A) Ionic bond - c, transfer of electrons.

B) Covalent bond - a, sharing of electrons.

C) Metallic bond - b, freely moving electrons.

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Answer:

Wind is the horizontal movement of air, transporting energy transferred from the earth's surface as sensible and latent heat. Sensible heat is transferred by the processes of conduction and convection. Conduction transfers energy within a substance, and convection transfers energy through the vertical movement of the heated substance. Latent heat is the transfer of energy by transforming the substance itself. As you recall, water has the ability to exist as liquid, gas or solid. The transformation from liquid to gas is called evaporation; the reverse process, from gas to liquid, is called condensation; from liquid to solid is known as solidification (freezing); and from solid to liquid, fusion (melting). Water can also be transformed directly from solid to gas (sublimation), or the reverse, through a process called deposition. We will see these various processes in the formation of clouds.

Explanation:

if I did not give answer then i hope i at least helped!

OkSpeed is still the most common factor in fatal road accidents, ... a few kilometres per hour above the speed limit greatly increases the risk of an ... For a car travelling at 70 km/h the risk increased fourfold. ... where Vf is the final velocity, V0 is the initial velocity, a is the rate of deceleration and d is the distance ...

Missing: 240 ‎| Must include: 240

Answer:

The halogens

Explanation:

In the s and p-blocks, the halogens have the highest value of electronegativity.

This is because they only need one electron to complete their configuration.

Answer:

Check explanation section.

Explanation:

In order to understand balanced force and unbalanced forces the first law of Newton should be considered as a basic knowledge.

For Balanced forces, there is equal equality in the direction of the forces. In balanced forces, there is no acceleration.

For unbalanced forces, there is acceleration that is go say there is going to be movement. Therefore, net force is equal to unbalanced forces.

(i) Suitcase dropped from a height.

Answer: since there is movement that is acceleration, then the force here is unbalanced force. The resultant force is downwards.towards the greater force direction.

(ii) A bicycle moving with constant velocity on a straight road.

Answer: As the bicycle moves at constant velocity on the straight road the force here is Balanced. Frictional forces balances the forces from the cyclist.

(iii) The rope does not move in a tug of war on applying force at both ends.

Answer: Balanced force.

The atom will gain 3 electrons

Valence electrons are electrons that are used to bond which are located in the outer shell of the atom

The electron configuration of N  :

[He] 2s² 2p³

This configuration shows that there are 5 valence electrons in the outer shell of the N atom

So based on the octet rule, the N atom will bind 3 more electrons to make it stable

An example is the formation of covalent (triple) bonds in the formation of N2 molecules

Answer:

Chemical changes

Explanation:

a)Burning a piece of charcoal - chemical change

b) Heating copper (ii) carbonate strongly - chemical change

c) Heating Zinc oxide strongly - chemical change

The given types of reaction indicates chemical changes. A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible and hence, it is a permanent procedure.

 Burning of charcoal produces a new kind of produces in the combustion process.

Both heating of copper(ii)carbonate strongly and zinc oxide will lead to a decomposition reaction in which new compounds are formed.

the answer is:

a. increases

a. increases.

The amount of energy required to remove an electron from an isolated atom or molecule.

→ Trend for Ionization energy:

Thus, for each successive electron removed from an atom, the ionization energy increases.

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Answer:

False

Explanation:

Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.

Answer:

false :)

Explanation:

Answer:

Nd.

Explanation:

Counting the electrons we get 60.

So it is the element with atomic number 60.

Neodymium Nd.

Answer:

Rubidium

Explanation:

Rubidium has atomic number 37 and belong to group one alkali metals and has one valence electron at the outermost shell whiz is 5s1

The given electronic configuration is that of element rubidium which is a s-block element with one valence electron.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Thus,  given electronic configuration is that of element rubidium which is a s-block element with one valence electron.

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Answer:

Q1. B

Q2. D

Q3. C

Hope it helps............

Plz mark as brainliest

Answer:

the level below which the ground is saturated with water.

Explanation:

Explanation:

speed = distance/time

= 23.7/54 m/s

= 0.44 m/s

speed of a dog running through a field = 0.44 m/s

Answer:

euglena

Explanation:

hope this helps

Answer:

spanish conquistadors, who were primarily poor nobles from the impoverished west and south of Spain, were able to conquer the huge empires of the New World with the help of superior military technology, disease (which weakened indigenous resistance), and military tactics including surprise attacks and powerful and there were no strangers to love and they knew the rules and so did i they just wanted to tell people how the were feeling and they wanted someone to understand so they were never gonna give you up and they were never gonna let them down and they were never gonna turn around and hurt other people in the army they were never gonna make the soldiers cry and they never were going to say goodbye but the years stop comming and they dont stop comming head to the rules gotta keep the groud running but Remember those walls I built Well, baby, they're tumbling down And they didn't even put up a fight They didn't even make a sound I found a way to let you win But I never really had a doubt Standing in the light of your halo I got my angel now It's like I've been awakened Every rule I had you breaking It's the risk that I'm taking I ain't never gonna shut you out Everywhere I'm looking now I'm surrounded by your embrace BabPatrician. Patricians were considered the upper-class in early Roman society. They controlled the best land and made up the majority of the Roman senate.y, I can see your halo You know you're my saving grace You're everything I need and morei t's written all over your face Baby, I can feel your halo Pray it won't fade away  Hit me like a ray of sun Burning through my darkest night You're the only one that I want Think I'm addicted to your light  swore I'd never fall again But this don't even feel like falling Gravity can't forget To pull me back to the ground again PatricPatrician. Patricians were considered the upper-class in early Roman society. They controlled the best land and made up the majority of the Roman senate.ian. Patricians were considered the upper-class in early Roman society. They controlled the best land and made up the majority of the Roman senate.

Explanation:

Answer:

All elements are composed of Atoms.

(if you have the same question with a different set of answers read the notes I left down bellow)

Explanation:

Dalton’s Atomic Theory - All elements are composed of atoms, atoms of the same element are identical, atoms of different elements can chemically combine to in whole number ratios, chemical reactions occur when atoms are separated, joined or combined.

(those are from my notes that I took for my chem module. I really hope this helps, also I took the test and this is the right answer :)) )

Answer:

Mercury is a thick substance and able to sustain and hold anything with any metallics with metal, such as with water it is not working as water is a thin substance and not able to hold heavy things

Explanation:

The coefficient for iron (Fe) in the balanced chemical equation is 3.

Lets first analyse the chemical equation presented to us which is Fe + Cl2 = FeCl3

The number of iron atoms on each sides is 1. However, the number of Cl atoms on the left and right sides is 2 and 3, respectively.

To balance the equation, we need to make sure tht the same number of atoms of each element is present on both sides of the equation.

To balance the number of Cl atoms, we need to add a coefficient of 2 to FeCl3 which becomes Fe + Cl2 → 2FeCl3

For us to o balance the number of Fe atoms, we need to add a coefficient of 3 to Fe. It becomes 3Fe + Cl2 → 2FeCl3

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Answer:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

Explanation:

That's what google said.

Answer:

39.0983.

Explanation:

Answer:

1.204 × 10²³

Explanation:

The number of atoms in a mole is always 6.022 × 10²³, known as Avogadro's number or Avogadro's constant.

To convert moles to atoms, multiply the molar amount by Avogadro's number.

(6.022 × 10²³) × 0.2

         = 1.204 × 10²³

Answer:

oop oof

Explanation:

Answer:

A gas with a rotten egg smell is evolved

Explanation:

When iron fillings and sulphur were heated in the vessel, the following chemical reaction took place;

Fe(s) + S(s) -----> FeS(s)

This is a direct combination reaction.

Subsequently, when dilute H2SO4 is added, the following reaction takes place;

FeS(s) + H2SO4(aq) ------> FeSO4(aq) + H2S(g)

He immediately observes the evolution of a gas with a rotten egg smell.

Answer:

3 valence electrons

The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.

Explanation:

Nihonium has to be the #113 element of the periodic table

A. is the correct answer because Boron has 3 electrons too,

All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.

Boron element would have properties most similar to the new element. Therefore, option (A) is correct.

The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.

The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.

Therefore, both Boron and a new element with atomic number 113  have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.

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