Answer:
LI
Explanation:
There is three Li in the start but One Li after
State the types of change that take place in each of the following
a)Burning a piece of charcoal .........
b) Heating copper (ii) carbonate strongly....
c) Heating Zinc oxide strongly
In a experiment to determine the percentage o
40cm3 of 0.51
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.
Chemsitry help pleasee
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.
Electronegativity is the tendency of an atom to draw electrons to itself in a covalent bond. Halogens requires just one electron to complete their octet. In a bond, they have more electronegativity than other elements. The most electronegative atom is located in the halogen group.we (get) up at 4:30 yesterday morning
Answer:
oop oof
Explanation:
Predict the Products and then Balance: H2CO3 =
A) H2CO3 = H2O + CO2
B) H2CO3 = H2 + CO2
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
how many moles are present in 100 grams of potassium?
Answer:
39.0983.
Explanation:
y’all wanna explain what a water table is?
Answer:
the level below which the ground is saturated with water.
Explanation:
1) A vehicle is traveling at 150 km/h after 3 hours it is traveling 240 km/h.
Was the vehicle accelerating or decelerating and at what rate?
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
Please help me with these questions... please..
Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices
A.boron
B.carbon
C.hydrogen
D.beryllium
What would you name this new element?
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.
Why do the elements of same group have similar chemical behavior?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.
Learn more about elements with similar chemical behavior, here:
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Predict: What is likely to happen to electrons in the atom pictured above?
-the atom will gain 3 electrons
-the atom will lose 5 electrons
-the atom is unreactive and electrons will not move
-the atom will gain 8 electrons
The atom will gain 3 electrons
Further explanationValence 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
Pb(NO3)2(aq) + KCl(aq) ---- → KNO3(aq) + PbC12(s)
2. Many rings and other jewelry are made of gold. Gold can be found on the periodic table as Au. It has a melting point of 1337K and a boiling point of 3234K. What is gold classified as?
A. An element B. A Compound
C. A Homogenous Mixture D. A Heterogeneous Mixture
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.)
Please do the worksheet
Quantitative was to measure light intensity
JANKS is looking under a microscope and sees a colony of green cells living on a spherical structure. She is most likely to be observing a...
A. volvox
B. Amoeba
C. Paramecium
D, Euglena
Answer:
euglena
Explanation:
hope this helps
57.1% carbon, 6.16% hydrogen, 9.52% nitrogen, and 27.18% oxygen
Write the symbol of each neutral element based on its written electron configuration:
Answer:
Nd.
Explanation:
Counting the electrons we get 60.
So it is the element with atomic number 60.
Neodymium Nd.
The mass number is the average mass of all isotopes of that element, while the atomic mass is the quantity of protons and neutrons within one atom/isotope. true or false
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:
plz help it is urgent
will give brainliest
it is only multiple choice q
Answer:
Q1. B
Q2. D
Q3. C
Hope it helps............
Plz mark as brainliest
What is the coefficient for iron when the equation below is balanced?
Fe + Cl2 = FeCl3
A) 1
B) 4
C) 3
D) 2
The coefficient for iron (Fe) in the balanced chemical equation is 3.
How does the balance chemicals equation look like?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
Find more exercises on chemical equation;
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In each case, state whether the forces are balanced or unbalanced. If unbalanced, calculate the net force and describe the direction of the resultant force.
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.
What is the volume of 89.6 moles of gas at STP *
A hypothesis .........
Answer:
all of the above
Explanation:
a hypothesis is indeed the second step. it also can be tested since you made it beforehand. it also is supposed to be educated. so all of the above.
Answer:
All of the above
Explanation:
Calculate the speed of a dog running through a field if he is covering 23.7 meters in 54 seconds.
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
An element contains only one kind of
A. particle. B. property. C. protein. D. raw material.
Answer:
A
Explanation:
an element contains only one kind of particle
calculate the number of different atoms in 0.2 mol ethene
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
which type of bond joins nonmetals atoms to nonmetal atoms
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.
Determine what elements are denoted by 1s22s22p63s23p64s23d104p65s1
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.
Learn more about electronic configuration,here:
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Which of the following statements is one of the postulates in Dalton´s theory?
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 :)) )
Rahul was given iron filings and sulphur powder. He prepared a compound of iron sulphide by heating the components in a china dish. What would be his observation if he adds a few drops of dilute sulphuric acid into the compound?
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.
if a neutral atom has an atomic number of 23, how many electrons does it have?
