Chemistry Middle School
B. A pair of electrons belongs to two atoms at the same time
Covalent bonding occurs between two unstable elements through sharing of pair of electrons. During bonding, two elements combines and shares a pair of electron to form a molecule. This electron completes both elements outermost shell and thereby forming a compound. Example of a compound that forms covalent bonding is sodium chloride (NaCl).
Sodium which is a group1 element possesses just one electron in its outer shell while chlorine, a group 7 element possess 7 valence electrons in its outermost shell making them unstable. Sodium acts as a donor by donating its lone pair of electron to chlorine thereby becoming a positively charged element while chlorine accepts this line pair of electron to completes its outermost shell making it stable and becoming negatively charged particle (being the acceptor). This bonding between this atoms if different elements is what is called covalent bonding.
covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms
the sharing of electrons allows each atom to attain the equivalent of a full outer shell, corresponding to a stable electronic configuration.
Which of these expressions are correct variations of the Combined Gas Law?
Both: T1 = T2 (P1V1/P2V2)
V2 = V1(T2/T1)(P1/P2)
To answer this question, we are going to take the expressions in question as;
i) T1 = T2 (P1V1/P2V2)
ii) V2 = V1(T2/T1)(P1/P2)
We are required to determine whether the expressions are correct variation of the Combined Gas Law.
- Combined gas law puts together the Boyle's law and the Charles's law.
- According to Boyle's law, the volume of a fixed mass of a gas is directly proportional to the absolute temperature and inversely proportional to the pressure.
- Therefore; V α T/P
From the equation, we can rearrange it to get the expressions;
T1 = T2 (P1V1/P2V2)
V2 = V1(T2/T1)(P1/P2)
Thus, both expressions are correct variations of the combined gas law.
Describe what happens in a single replacement reaction. What can replace what?
The one element is substituted in place of other element in compound.
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Consider the reaction between zinc and silver nitrate. In this chemical reaction the zinc is substituted in place of silver in silver nitrate compound.
2AgNO₃ + Zn → ZnNO₃ + 2Ag
The starting material consist of compound ( AgNO₃) and pure element (Zn).
After reaction a new compound ( ZnNO₃) and pure element (Ag) is generated.
2. Oxygen can combine with carbon to form two compounds, carbon monoxide and carbon dioxide. The ratio of the masses of oxygen that combine with a given mass of carbon is 1:2. This is an example of
A. Law of Mass Conservation
B. Law of Definite Proportion.
C. Law of Multiple Proportions
D. None of the above
The ratio of the masses of oxygen that combine with a given mass of carbon is Law of Multiple Proportions.
Law of Multiple Proportions:
When two elements unite to generate two or even more chemical compounds, the masses of one element mixed with a fixed mass of the other have a simple ratio. Carbon, for example, reacts with oxygen to produce two compounds: carbon dioxide and carbon monoxide.
12 parts by mass of carbon mix with 32 parts by mass of oxygen in carbon dioxide, whereas 12 parts by mass of carbon interact with 16 parts by mass of oxygen in carbon monoxide.
Carbon monoxide and carbon dioxide have oxygen masses of 16 and 32, respectively, when coupled with a fixed mass of carbon.
As a result, option C is the proper choice.
Find out more information about 'Carbon monoxide'.
A so that law of mass conservation because that explains mass of both of them
In the figure, angle E measures 54° and angle G measures 29º. What is the measurement of angle H? A 25°
it is because that
The answer is A 25 Degree's.
I did the work and got 25 ( :
Arrange the elements in order of increasing atomic radius.Use the periodic table to help you
S, F, Mg, Ba.
Sulfer(S) is 100pm, Fluorine(F) is 147pm, Magnesium(Mg) is 173pm, and Baruim(Ba) is 268pm.
Hope this helps
Which substance is use to increase the rate of catalyst?
A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. ... Enzymes are proteins that act as catalysts in biochemical reactions. Common types of catalysts include enzymes, acid-base catalysts, and heterogeneous (or surface) catalysts.
5.Which of these changes is a chemical change? A. iron rusting B. water boiling C. glass breaking D. a balloon popping
Explanation: Iron rusting is the only one that creates a new substance that wasnt there before.
Iron rusting because i learned it already
How many moles are 25.5 grams of H2O
The molar mass or the neutron number can be found from the periodic table.
There are two elements in H2O
- Hydrogen, molar mass 1
- Oxygen, molar mass 16
To find the total molar mass add 2 hydrogens and one oxygen mass. So 2(1)+16=18
- So for this question you want to know how many moles are in 25.5 grams of H2O. the easiest way of solving this is by figuring out how many moles are in 1 gram of H2O, then multiply that by 25.5. Let me show you how.
- So for one gram of H2O, we have 0.055508435061792 mol.
- Using a calculator, we can use that 0.055508435061792 mol and multiply it by 25.5 grams of H2O to get the answer.
I hope this helped!
How many moles of nacl are present in 600 ml of a 1.55 m nacl solutions
The answer is 2.583 moles
molarity is defined as the number of moles divided by the volume of the solution, as follows:
M = nmoles/Volume
Clearing the nmoles:
600 mL = 0.6 L
nmoles = MxVolume = 1.55 mol/L x 0.6 L = 2.583 moles
The moles of NaCl are present in 600 ml of a 1.55 m NaCl solutions
nmoles= 2.583 moles
What moles of NaCl are present in 600 ml of a 1.55 m nacl solutions?
Generally, the equation for the Molarity is mathematically given as
M = nmoles/Volume
nmoles = MxVolume
nmoles= 1.55 mol/L x 0.6 L
nmoles= 2.583 moles
Read more about Chemical reaction
Describe how a mixture of iron filings,sand and iodine can be separated
you can use a maganet to separate the iron. to remove the iodine you can heat up the sand and it will get rid of the iodine turning it into gas leaving only the sand
Which colors form part of the color wheel? ______ (Teritary, Primary, Secondary) colors are those you can't get by mix in other colors. They are red, blue, and yellow. ______ (Tertiany, Primary, Secondary) colors come from mixing two primary colors.
The primary colours are red, blue and yellow. The secondary colours are produced by the combination of primary colours. The answers are primary and secondary.
What is a primary and a secondary colour?
The primary colours are defined as the permanent colours which cannot be obtained by mixing two or more different colours. They are called the basic colours which can be mixed together to produce other colours. The primary colours are red, yellow, blue and green.
The secondary colours are known as those colours which are formed by combining equal mixture of two primary colours. On the colour wheel, secondary colours are located between the primary colours.
The combination of red and yellow give orange, red and blue make purple, blue and yellow give green. So orange, green and violet are called secondary colours.
Thus Primary colours cannot mix and secondary colours come from mixing.
To know more about colours, visit;
Answer: primary colors are those you can't get by mix in other colors. They are red, blue, and yellow. secondary colors come from mixing two primary colors.
An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element? A.10
There are twenty neurons because the number of neurons is equal to the atomic number
Which types of orbitals are found in the principal energy level n = 3? Α. s, d
B. s,p, d
C. s, p
D. s,p, f
E. s,d, f
n= 1 only s
n= 2 s and p
n= 3 s,p and d
n= s,p,d and f
Which statement correctly describes a physical change? A.
involves breaking and creating chemical bonds but not changing a phase
B. may involve a change in phase but does not involve a change in the molecular structure
C. may involve converting two or more substances into new substances
involves changes at the molecular level
involves energy transfer and change in color
B. may involve a change in phase but does not involve change in the molecular structure
Consider the two electron arrangements for neutral atoms A and B. Which atom is more stable? A - 1s2, 2s2, 2p6, 3s1
B - 1s2, 2s2, 2p6, 5s1
The electronic configuration of A is 1s²2s²2p⁶3s¹ is more stable than that of B because all lower energy levels are filled first.
What is an electronic configuration?
The electron configuration of an atom provides information about electrons being distributed in different energy levels. In the electron configuration, the number of electrons of an atom is written as a superscript of atomic subshells. For example, the electron configuration of Neon (Ne) can written as 1s²2s²2p⁶.
The principal quantum number is used to determine the maximum number of electrons that will be filled in an electron shell. The formula 2n² tells the total electrons that can be filled in a particular shell.
The electrons in the atomic orbitals of a lower energy level must be completely filled before filling an orbital with a higher energy level.
Therefore, the electronic configuration 1s²2s²2p⁶3s¹ of atom A is more stable than 1s²2s²2p⁶5s¹ of atom B.
Learn more about electronic configuration, here:
The outer electron of atom B has moved to a higher energy state because (5s1 compared to 3s1. 5 is greater than 3). Therefore, your answer is B.
How is burning magnesium different from burning methane?
I believe/thought they were very similar due to the fact that they both undergo a process called “oxidation” where they release oxygen into the atmosphere.
Describe how particles of iron (Fe) an oxygen (O2) react to how produce oxide (Fe2O3), also known as rust.
Described by a redox reaction below
Iron(III) oxide is an ionic compound, since it consists of a metal, iron, and a nonmetal, oxygen.
Ionic compounds are formed when metals lose their valence electrons in order to have an octet in their previous shell and donate them to nonmetal atoms, so that nonmetals fill their outer shell to have an octet.
As a result, positive ions (cations) and negative ions (anions) are formed. When iron reacts with oxygen, the following reaction takes place:
This is a redox (oxidation–reduction) reaction, since we have electron loss and gain. Four iron atoms lose a total of 12 electrons to obtain a +3 charge in the final compound, while 3 oxygen molecules gain these 12 electrons to become 6 oxide anions with a -2 charge.
Write 1 paragraph to explain what circular motion is?
Circular motion is the movement of an object in a circle or rotation. The scientific term for a circular motion is centripetal acceleration. When an object moves in a circular motion at constant speed its velocity is always changing because the direction. It can be uniform which is when the object has constant angular rate of rotation and constant speed. There is also non-uniform which has a changing rate of rotation.
What information does the pH give about a solution? A.) The hydrogen ion concentration in the solution
B.) The conjugate acid-base pair that is in the solution
C.) The amount of hydrogen gas produced in a reaction
D.) The neutralization products produced in a reaction
Is it A..? Help
The correct option is A.
What does the pH of a solution signify?
The pH of a solution signifies the acidity or basicity of the solution. A solution is said to be neutral if the pH value is 7, if the pH value is less than 7 then it is acidic in nature and if the pH value is more than 7 then the solution is basic in nature.
What is the full meaning of pH?
The letters pH stand for the potential of hydrogen since pH is effectively a measure of the concentration of hydrogen ions (that is, protons) in a substance.
Learn more about pH here brainly.com/question/13557815
A} The hydrogen ion concentration in the solution
yes it is a measure of the concentration of the Hydrogen Ions in a solution which determines acidity
In order for substances to conduct electricity their ions must be
not a solid/ dissolved in water/ through melting because the ion's electrons have to be able to move freely and they can't do this when they are solids. they can occur