Answer:
Because according to VSEPR theory lone pair occupies more space than bond pair.
Explanation:
Lone pair of electrons repels from bonded pair of electrons than that between bond pair of electrons itself. Hence, molecules attain a geometry in which the repulsive force is minimum.
What is lone pair of electrons ?The lone pair of electrons are pair of electrons which are not involved in bonding in any occasion but can be donated through coordinate bonds in some compounds.
Oxygen, nitrogen etc. contains lone pair of electrons. According to VSEPR theory, the lone pair -lone pair repulsion > lone pair -bond pair > bond pair-bond pair repulsion.
Therefore, these electron pairs are aligned around the central atom in such a way that the repulsive force between the electron clouds are minimized.
For example, if consider hybridization of water molecule, it must acquire a tetrahedral shape, but the lone pairs will align axial and will assume a bent shape.
Find more on molecular geometry:
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What are columns on the periodic table called? What is the significance of the columns on the periodic table?
Answer:
The vertical columns of the periodic table are called groups, or families. The significance is elements with similar properties are placed in the same vertical columns. The horizontal rows of the periodic table are called periods. The significance is that properties vary from left to right along the rows.
Explanation:
We just did this in science
Answer:
columns in the periodic table are reffered to as "periods". periods represent elements with the same number of shells i.e all elements in period 1 have 1 shell (k shell) and vice versa.
Members in band noticed that drums seemed to vibrate and play themselves during practice. Why? A. The music was played at an natural frequency of the drums B .The music was so loud it caused the drums to vibrate Help pls!
Answer:
The music was played at an natural frequency of the drums
Explanation:
The natural frequency of a body is the frequency when we notice that the system oscillates without any driving or damping force. This is also referred to as the normal mode of vibration because all parts of the system move sinusoidally at the same frequency.
So, when music is played at the natural frequency of the drums, the drums tends to vibrate without any driving force. We can now say that the drums are 'playing themselves'.
Can anyone help me with the final answers plzzzzz
I dont understand and know the anwser to this
What is the Molar Mass of Cl4
Answer:473.39626 g/mol
Explanation:
Answer:
153.82 g/mol
Explanation:
While both comets and asteroids are found to orbit the sun in our solar system which system which choice correctly explain how they are different
Answer:
Comets are made of ice, dust, and rocky material. Asteroids are made of rock and metal material.
Explanation:
thats how they are different from each other
what type of bond( ionic or covalent) does silver and nobelium form?
In the sixteenth century, the geocentric theory was a daim with substantial evidence. Which of the following best describes why scientists began to regard the heliocentric theory as more acceptable?
Answer:
The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.
Explanation:
Which of the following substances would have the highest dispersion forces? Why?
Ne, FCI, N2H4 SO2, SO3, C20H42, MgO, Si, CsI, Sn, H2O, CCl4
Answer:
Si
Explanation:
Dispersion force or London force is the force of attraction between two atoms or molecules in a substance in solid , liquid and gas . In gas , this force is minimum and in solid this force is maximum . In solid this force is maximum in metals in which this force forms metallic bond .
Among the given substances , Si , Sn , MgO , C₂₀H₄₂ are solid , so dispersion force will be high in them .
Among all as mentioned above , Si will have highest dispersion force . It is due to four covalent bond that bind two atoms of Si in solid silicon . Its three dimensional crystal structure consist of silicon atoms , all bound by four covalent bonds .
what is the definition of base
Good quality water is needed for a healthy life.
In the United Kingdom, obtaining safe water for drinking is as simple as turning on a tap. The water is made safe to drink by what and companies.
However, in many parts of Africa and Asia, water used for drinking is contaminated and untreated. It is estimated that 2.2 million people die each year as a result of drinking contaminated water.
Explain why water for drinking is filtered and then treated with chlorine.
Answer:
Simply cuz so u can drink It without bacteries chlorine also changes a bit taste depends on RM
!Do not use this answer for cheating, please only use my answers to check your own!
Before tap water was found, people would use rocks, gravel, and sometimes even thick cloth to filter water. If you do not filter water, there is a huge chance that bugs, bacteria, viruses, and other things may be entering your body. Today some houses still have the past was of filtering, with rocks and gravel. Except chlorine is used to kill any bacteria that was left over the rocks and gravel may of missed.
Isotopes are atoms of the same element that have the same chemical property but may not have the same physical properties A true B false
Answer:
false
Explanation:
Atoms of the same element that differ in their numbers of neutrons are called isotopes. Many isotopes occur naturally. ... Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and elec
Answer:
False
Explanation:
It says that it may not have the same physical properties but it always have the same physical properties.
What is a reaction rate?
Answer:
Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume)
Explanation:
Answer:
A measure of how fast products are made in a reaction.
Explanation:
i just took the test and it gave me this cuz the other person was wrong
Using the equation above, how many moles of Na are produced when 2.75 moles of H2 react with excess NaCl? will give BRAINLIEST
Answer:
5.5 moles of sodium are produced
Explanation:
Given data:
Number of moles of hydrogen = 2.75 mol
Number of moles of Na produced = ?
Solution:
Chemical equation:
H₂ + 2NaCl → 2HCl + 2Na
Now we will compare the moles of hydrogen and sodium from balance chemical equation:
H₂ : Na
1 : 2
2.75 : 2/1×2.75 = 5.5 mol
Thus, 5.5 moles of sodium are produced.
A solution of nitric acid is formed by dissolving 5.00grams of nitric acid in enough water to make 1.5 liters of solution.
c. What was the molarity of this solution?
d. What is the pH of this solution?
Molarity = 0.053 M
pH = 1.276
Further explanationGiven
5 g of HNO₃
1.5 L solution
Required
Molarity
pH
Solution
Molarity shows the number of moles of solute in every 1 liter of solution.
mol HNO₃(MW=63 g/mol) :
= mass : MW
= 5 g : 63 g/mol
= 0.079
Molarity :
=0.079 : 1.5 L
= 0.053 M
pH = -log [H⁺]
For strong acids like HNO₃ :
[H⁺] = a.M
a = valence of acid / amount of H⁺ released
M = acid concentration.
HNO₃ ⇒ H⁺ + NO₃⁻⇒ valence 1(amount of H⁺=1)
[H⁺]=1 x 0.053
[H⁺]= 0.053 M
pH= - log 5.3 x 10⁻²
pH = 2 - log 5.3
pH= 1.276
Who discovered electrons using Crookes tube?
a.) Democritus
b.) Ernest Rutherford
c.) Hantaro Nagaoka
d.) J. J. Thomson
e.) John Dalton
f.) Niels Bohr
Answer:
William Crookes????????????????
A temperature increase causes the particles to what ??!
Air pressure is caused by: gas particles striking the walls of a container or an object. b. gas particles are taking a test gas particles reaching 0 degrees Kelvin d. Air pressure has nothing to do with gas.
Answer:
D
Explanation:
9) A cactus plant, a snake, and a hawk can be members of the same
A- community
B- kingdom
C- population
D- species
13) gene are part of a
a-cell wall
b-chromsome
c-hormone
D-vitamin
Help 15 points!!!
Complete the following combustion reaction.
Answer:
C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O
2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O
Explanation:
The reaction above is simply termed combustion reaction in which an organic compound react with oxygen to produce carbon dioxide and water. Thus, we can obtain the balanced equation for the reaction reaction as follow:
C₈H₁₈ + O₂ —> CO₂ + H₂O
There are 8 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 8 before CO₂ as shown below:
C₈H₁₈ + O₂ —> 8CO₂ + H₂O
There are 18 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 9 before H₂O as shown below:
C₈H₁₈ + O₂ —> 8CO₂ + 9H₂O
There are 2 atoms of O on the left side and a total of 25 atoms on the right side. It can be balance by writing 25/2 before O₂ as shown below:
C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O
Thus, the equation is balanced!
The above equation can also be written as follow:
C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O
Multiply through by 2
2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O
A white solid was left out after a class had tidied up their
experiment. During the experiment, one of the pupils had
removed the label on the white solid. The teacher knew the
solid was a Group 1 metal halide, so they performed a
flame test followed by a silver nitrate test. The flame test
gave a red flame, and the silver nitrate test gave a cream
precipitate. What is the white solid?
Answer:
LiBr
Explanation:
Group 1 metals give a characteristic colour when subjected to flame test. The colour can tell us exactly what the identity of metal being studied.
Now, Lithium metal gives a red flame. Hence the group 1 metal ion is Li^+. Similarly, bromides give a creamy precipitate when reacted with silver nitrate.
This means that the solid substance under study is LiBr.
what do you meaning seachants? write with example.
Answer:
answer
Explanation:
simile is a figure of speech that compares two different things in an interesting way. The object of a simile is to spark an interesting connection in a reader's or listener's mind. A simile is one of the most common forms of figurative language. Examples of similes can be found just about anywhere from poems to song lyrics and even in everyday conversations.
Similes and metaphors are often confused with one another. The main difference between a simile and metaphor is that a simile uses the words "like" or "as" to draw a comparison and a metaphor simply states the comparison without using "like" or "as".
An example of a simile is: She is as innocent as an angel. An example of a metaphor is: She is an angel. Do you see the difference? The simile makes a direct comparison, the metaphor's comparison is implied but not stated.
What role does valence electrons play in reactivity for an element?
Explanation:
The valence electrons within an atom is the number of electrons in its outermost shell.
These electrons are used by an atom to react with one another. They determine the extent to which an atom is ready to combine either by losing, gaining or sharing these electrons.
Every atom desires to have a completely filled outermost shell. Only the elements in group 8 have a complete octet. The need to attain stability is driven by the number of electrons in their valence shell. Therefore, some atoms are very reactive. Those needing one electrons to complete their octet and also those that must lose one electron are very reactive.1.5 moles of N2 gas = ______L of N2 gas at STP
Answer:
33.6 lliter
Explanation:
volume in stp = no of moles *22.4
=22.4* 1.5=33.6liter
For a chemical change to happen what must atoms be
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
please help
if a molecule is polar, what is true about the distribution of its valence electrons
What are the 4 chambers and what is the function of each?
Answer:
Where are these Chambers located ], there is hundreds of them in the world
Please help due today
DESPERATE WILL GIVE BRAINLIST AND THANKS
Which phase of cell division is shown?
prophase
metaphase
anaphase
telophase
anaphase
or if not
telophase
How do chemists use systems and order in their work?
Answer:
5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .
Explanation:
