help me pls :( determine the number of lone pair electrons on each H in NH3. Z of N=7, H=1
Answers
Answer:
The correct option is;
A. 0
Explanation:
The ammonia molecule has four pairs of electron whereby being located around the central nitrogen atom is tetrahedral in shape.
Of the four pairs of electrons, three are the bonds between nitrogen and hydrogen, such that there is only one lone pair of electron in the ammonia molecule that is located on the central nitrogen atom
The one electron on each hydrogen atoms and one of the electrons on the nitrogen atom form a bonding pair of electrons, that is the bonding pair of electrons are shared by the two nuclei, hydrogen and nitrogen
Since a lone pair are a pair of electrons attached to only one nucleus, the hydrogen in ammonia has no lone pair of electrons.
Related Questions
I'll mark you brainliest if you answer first! - Iron filings and copper (II) sulphate solution are mixed together and they produce elemental copper and iron (II) sulphate solution. Based on the quantities of the reactants used in the experiment, determine which is the limiting reagent. For the excess reagent, determine how much in grams is left over. (2 grams of iron was used, and 7 grams of copper
Answers
Answer:
First, write an equation for the reaction involved.
Fe + CuSO4 ---> FeSO4 + Cu
Now, calculate the no. of moles added in the reaction. (n.o.m. = mass /molar mass)
No. of moles of Fe added = 2 / 55.8
= 0.0358 mol
No. of moles of CuSO4 = 7 / (63.5 +32.1+16x4)
= 0.04386 mol
From the equation, the mole ratio of Fe : CuSO4 = 1:1,
meaning 1 mole of Fe reacts with 1 mole of CuSO4.
It also indicates that the no. of moles reacted in Fe equals to the no. of moles reacted in CuSO4.
0.04386 > 0.0358
The no. of moles of CuSO4 is higher than that of Fe, meaning all moles of Fe will be reacted while not all CuSO4 reacts.
Hence Fe is the limiting reagent, and CuSO4 is in excess.
All 0.0358 moles of Fe reacts, meaning the no. of moles of CuSO4 left unreacted = 0.04386 - 0.0358
= 0.0080596mol
mass of CuSO4 unreacted = 0.0080596 x (63.5 +32.1+16x4)
= 1.28g
What did the photoelectric experiment demonstrate?
A. Light can cause electrons to be released from the surface of a
metal.
B. Light can deposit electrons on a metal surface.
C. Light can make metal atoms move around, producing electricity.
D. Light can heat metal enough to produce electricity.
Answers
Explanation:
When an electromagnetic wave like light hits a material, the electrons gets emitted. The emission of electrons is called photoelectric effect. The emitted electrons are called photoelectrons. In this process the transfer of energy takes place from light to an electron.
Hence, the correct option regarding the photoelectric experiment is (A) " Light can cause electrons to be released from the surface of a metal."
hurry I'm on a timer
Which two materials form igneous rocks upon cooling?
A. lava and crystals
B. magma and lava
C.crystals and intrusive rocks
D.intrusive rocks and sediment from rocks
Answers
Answer:
B. Magma and Lava
hopefully this helped :3
Answer:
B: magma and lava
Explanation:
PLEASE HELP!! thank you Which element does X represent?
Answers
Answer:
95 Kr36
Explanation:
The process by which a large nucleus split into two smaller nuclei is called nuclear fission and occurs after the nucleus has absorbed a neutron that is a product of the radioactive decay of another atom. The formed fission fragments are unstable and extremely radioactive.
how many significant figures are in 3,200,000.0 kilometers
Answers
Answer:
2
Explanation:
significant figures begin from {1,2,3, ...}
The number of significant figure in 3,200,000.0 km has been 2. Thus, option A is correct.
The significant figure has been given as the number of digits in the value that has been responsible for the accuracy of value. It has been given as digits in a number.
For example, significant figure (S) in following has been:
[tex]3.4\;\times\;10^4\\S=2\\[/tex][tex]346209\\S=6[/tex]The number of significant figure in 3,200,000.0 km has been:
[tex]3,200,000.0=3.2\;\times\;10^6\\\implies 3.2\;\times\;10^6\\S=2[/tex]
The number of significant figure in 3,200,000.0 km has been 2. Thus, option A is correct.
For more information about significant figures, refer to the link:
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HELP NEEDE ASAP Why NH3 ACTS AS BRONSTED-LIWERY BASE?
Answers
Answer:
NH
3
acts as a Bronsted-Lower acid by giving its lone pair electrons.
Only in reaction 1 and 2 it acts as Bronsted-Lowry acid.
Explanation:
hope it's help you
Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) Nonbonding electron pairs are present on the F in the molecule HF. (2) The two atoms involved in a multiple covalent bond must always be atoms of the same element. (3) A molecule of hydrogen peroxide contains the same number of atoms as a molecule of sulfur trioxide does. Group of answer choices All three statements are true. None of the statements are true. Only one of the statements is true. Two of the three statements are true.
Answers
Answer:
(1) Nonbonding electron pairs are present on the F in the molecule HF. True
(2) The two atoms involved in a multiple covalent bond must always be atoms of the same element. False
(3) A molecule of hydrogen peroxide contains the same number of atoms as a molecule of sulfur trioxide does. True
Two of the three statements are true.
Explanation:
Non bonding electrons are also known as lone pairs. They are electron pairs present on an atom but are not involved in chemical bonding. They are usually localized on the atom of one of the bonding elements. In HF, there are three nonbonding electrons localized on the fluorine atom that do not participate in chemical bonding.
When multiple bonds are formed between atoms, they must not be atoms of the same element, for instance carbon and nitrogen forms multiple covalent bonds in chemical moieties such as they cyanide ion.
A molecule of hydrogen peroxide (H2O2) contains four atoms just as a molecule of sulphur trioxide(SO3) does.
endothermic or exothermic?
The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.
Three drops of concentrated sulfuric acid added to 100 milliliters of water in a beaker makes the beaker hot.
Ammonium chloride dissolved in a beaker of water makes the beaker cold.
Uranium atoms are split to produce nuclear energy.
Water separates into hydrogen and oxygen when an electric current is run through it.
Methane and oxygen are combined to produce methanol and heat.
Answers
Answer:
Endothermic
Exothermic
Endothermic
Exothermic
Exothermic
Exothermic
Explanation:
Endothermic is when a reaction absorbs heat.
Exothermic is when a reaction releases heat.
Endothermic reactions:
The reaction between
ammonium nitrate and
water absorbs heat
from the surrounding
environment.
Ammonium chloride dissolved
in a beaker of water makes the
beaker cold.
Water separates into
hydrogen and oxygen
when an electric current
is run through it.
Exothermic reactions:
Three drops of concentrated
sulfuric acid added to 100
milliliters of water in a beaker
makes the beaker hot.
Uranium atoms are split to
produce nuclear energy.
Methane and oxygen are
combined to produce
methanol and heat.
#platofam
HELP ME PWhat are the reactants in a chemical reaction?
O A. The ending substances
B. New substances that are formed
O c. All substances that are involved
O D. The starting substances
Answers
Answer:
D. the starting subtances
:)
Answer: D. The starting substances !!
Explanation:
Choose all the answers that apply
Plasma is made of:
free electrons
clumped atoms
n neutral atoms
free protons
ions
Answers
Answer:
free electrons
ions
neutral atoms
Explanation:
Plasma is a subset of gases that can be generated in the laboratory by warming the gas at a very high temperature. In other words, we can say it is jelly or that material which is moldable
It is made up of free electrons, ions, neutral atoms
Therefore according to the question, plasma is made of free electrons, ions and neutral atoms
Answer:
ions
free electrons
neutral atoms
Explanation:
differentiate between short period and long period
Answers
The question is incomplete. The complete question is as follows:
Differentiate between a short period and long period production functions.
Answer:
Difference between a short period and long period production functions is as follows:
Short period: During this period at least one of the factors of production is available in a fixed quantity. For example: Framers having fixed land for growing crops.
Long period: During this period all the factors of production are variable. So change in any variable can increase the production.
State and explain the observations when chlorine gas is bubbled through a solution of
fresh iron (II) sulphate solution.
Answers
Answer:
A reduction-oxidation (redox) reaction will occur.
Chlorine gas (Cl2) will accept electrons to form Cl- ions.
The Iron(II) ions (Fe2+) will lose electrons to form Fe3+ ions. (Iron (III) ions)
Fe2+ ions are green, while Fe3+ ions are yellow,
so the observation will be the solution turning from green to yellow.
A metal sample is heated and placed into the water in a calorimeter at room temperature. Which statement best describes how the calorimeter can be used to determine the specific heat capacity of the metal sample? Energy transfers to the metal from the water and calorimeter until they are all at room temperature. Energy transfers from the metal to the water and calorimeter until they are all at room temperature. Energy transfers to the metal from the water and calorimeter until they all reach a single temperature. Energy transfers from the metal to the water and calorimeter until they all reach a single temperature.
Answers
Answer:
Energy transfers from the metal to the water and calorimeter until they are all at room temperature.
Explanation:
Calorimetry is the process that is used to determine the amount of heat that has been transferred in any process. In any chemical or physical process, the amount of energy is required. This energy is measured by the process of calorimetry. A calorimeter is a device that is used in this process. The heat that has been used in the process is measured and the change in the temperature is noted.
Answer:
b
Explanation:
The breaking down and changing of rocks at or near Earth's surface is called _____.
Answers
Answer: Weathering
Explanation:
Weathering can break down rocks and change it shapes.
Which refers to the bending of a wave as it passes through one medium to another medium?
Answers
Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves
Answer:
B) refraction
Explanation:
Hope this helps
Other than carbon being relatively small, what is another reason that carbon can form so many compounds? the ability to form four covalent bonds the ability to change shape the ability to form a diatomic molecule the ability to split its electrons
Answers
Answer:
Ability to form four covalent bonds.
Explanation:
Carbon is the first member of group 14. It is essentially a nonmetal. It is a small atom which regularly exhibits tetra valency. This means that carbon is able to form four covalent bonds to four chemical species which may be the same or different each time. This leaves room for many different possible combination patterns of carbon with other chemical species.
Hence carbon forms a very large number of compounds due to its small size and its ability for form four covalent bonds to other chemical species in any bonding situation.
Answer: the ability to form four covalent bonds
Explanation:
The correct increasing order of Bond angle is H2O < NH3 < BCl3 < CCl4 H2O < NH3 < CCl4 < BCl3 NH3 < H2O < BCl3 < CCl4 NH3 < BCl3 < CCl4 < H2O
Answers
Answer:
H2O < NH3 < CCl4 < BCl3
Explanation:
Bond angle of a molecule or an ion can be explained by two concepts which are either by their valence shell electron pair repulsion (VSEPR) model or hybridization.
The VSEPR model determines the total number of electron pairs surrounding the central atom of the species. All the electron pairs will orient themselves in such a way as to minimize the electrostatic repulsions between them. These repulsions hence determine the geometry of the covalent bond angles around the central atom.
Hence; as the number of lone pairs increases from zero to 2 the bond angles diminish progressively.
Hybridization is the mixing and blending of two or more pure atomic orbitals to form two or moe hybrid atomic orbitals which are identical in shape and energy. During the process of formation of these hybrid orbitals, The bonds formed i.e the sigma bond and the pi bond determines the bond angle of such compound.
From the given compounds;
H20 have a bond angle of 104.5°
NH3 have a bond angle of 107°
BCl3 have a bond angle of 120°
CCl4 have a bond angle of 109.5°
thus in an increasing order of bond angle:
H2O < NH3 < CCl4 < BCl3
What type of bond exists between the atoms in a molecule of N2?
Answers
Answer:
covalent bonds
Explanation:
Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.
(if it is still confusing i have another way of explaining so jus let me know :)
Answer: Covalent
Explanation:
given that the electronic configuration of an element X is 1s2 2s2 2p6 3s2 3p4,it can be deduced that X:
a. belongs to group VI in the periodic table
b. belongs to period 4 in the periodic table
c. contains 3 unpaired electrons in the ground state
d. has atomic number 27
Answers
Answer:
Option A
Explanation:
The element X belongs to
=> Period 3 (Because it's valence shell is 3)
=> Group VI (Because electrons in the valence shell , 2+4 = 6)
The element X can be deduced to:
a. belongs to group VI in the periodic table
Periodic table:It is the arrangement of elements in the order of increasing atomic number.
Given Electronic configuration of element X:[tex]1s^2 2s^2 2p^6 3s^2 3p^4[/tex].This element has an atomic number 16. The element having atomic number 16 is Sulphur. It belongs to: Period 3 (Because it's valence shell is 3)Group VI (Because electrons in the valence shell , 2+4 = 6)Thus, Element X belongs to group VI.
Therefore, correct option is a.
Find more information about Periodic table here: brainly.com/question/15987580
What are some similarities and differences between group 1, 0 and 7 elements on the periodic table?
Answers
Answer:
Difference : group 1 elements are known as alkali metals, group 7 elements are known as transition metals
Similarities : Both group 1 and 7 elements become more reactive as u go down and up respectively
The number of joules needed to raise the temperature of 32 g of water from 12 °C to 54 °C is
The specific heat of water is 4.184 J/g °C.
Answers
Answer: 5,600 J
Explanation:
Joules = mass x specific heat x temperature change
32 x 4.184 x (54 - 12)
= 133.888 x 42
= 5,623.296
(significant figures => 5,600)
Which factor plays the biggest role in delaying the detection of childhood
diseases?
Answers
Answer:
poor access to health care providers
Explanation:
without health care providers you cant get tested.
what is photosynthesis?
Answers
Answer:production of glucose in the presence of light and chlorophyll from carbondioxide and water
Explanation:
Find the area of a circle inscribed in an equilateral triangle of side 18 cm. ( Take pi= 3.14). answer should be 54.78 cm²
Answers
Answer:
The answer according to me.............
Explanation:
How might a scientist confirm the results of other expirements by doing an experiment
Answers
For Group 2A metals, which electron is the most difficult to remove? the second the first the third All the electrons are equally difficult to remove.
Answers
Answer:
the third
Explanation:
when you remove the first the nucleur attraction becomes greater pulling the other valence electron closer thus the more you remove the harder it gets because the pull from the nucleus increases.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option C is correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
The elements that belongs to Group 2A metals are alkaline earth metals, their electronic configurations is [noble gas ]ns² so, it is easy to remove first electron and then second electron but it is very difficult to remove the third electron because after removing two electron we get noble gas configuration and effective nuclear charge also increases after removal of second electron.
Therefore, the correct option is option C.
Learn more about periodic table, here:
https://brainly.com/question/11155928
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Which organism is a producer? A) Oak tree B) Mushroom C) Mountain Lion D) Butterfly
Answers
Answer:
A
Explanation:
Oak trees are producers because they make their own food through the process of photosynthesis.
Answer:
A. oak tree
Explanation:
A producer is an organism that produces or creates its own food through the process of photosynthesis. Certain organisms, like plants, algae and some bacteria undergo this process. Carbon dioxide, water, and light energy from the sun are turned into glucose and oxygen. The glucose becomes the food for the organism.
A mountain lion and a butterfly are both animals. A mushroom is a fungus. Therefore, the correct answer must be A. oak tree.
Use the pictures shown to identify three ways of drawing hydrocarbon molecules.
Then write the molecular formulas. (1 point each)
Answers
Answer:
The three ways to in which the hydrocarbons are represented are;
a. The ball and stick model
b. Condensed structural formula
c. Skeletal structure
The molecular formula are
a. C₇H₁₆
b. C₆H₁₄
c. C₅H₁₂
Explanation:
a. The ball and stick model of organic compounds, displays the atoms and bonds in three dimensions, representing the atoms by spares and the bonds by rods
b. The condensed structural formula are similar to the structural formula with the difference that the formula is written in a linear fashion which conserves space and increases ease of writing and are written out faster.
c. In the skeletal structure diagram, the atoms are of the organic compound are combined together in the structural drawing of the essential features of the organic compound. In essence, a skeletal structure, depicts the skeleton of a compound as it is made up of the molecule's skeletal atoms.
The three ways in which the hydrocarbons are represented are:
a. The ball and stick model
b. Condensed structure
c. Skeletal structure
The molecular formula are
a. C₇H₁₆
b. C₆H₁₄
c. C₅H₁₂
Let us understand these models and forms one by one:
a. The ball and stick model of organic compounds, displays the atoms and bonds in three dimensions, representing the atoms by spares and the bonds by rods.
b. The condensed structural formula are similar to the structural formula with the difference that the formula is written in a linear fashion which conserves space and increases ease of writing and are written out faster.
c. In the skeletal structure diagram, the atoms are of the organic compound are combined together in the structural drawing of the essential features of the organic compound. In a skeletal structure, depicts the skeleton of a compound as it is made up of the molecule's skeletal atoms.
Learn more:
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Help. Why are state symbols used in chemical equations?
O A. They tell which reactions will happen and which won't.
B. They identify how much product will be made.
C. They identify what phase the substances are in.
O D. They tell how the atoms are arranged in the substances.
Answers
Answer:
The answer is option C.
They identify what phase the substances are in.
Hope this helps
A balloon is filled with 0.250 mole of air at 35 degrees celsius. If the volume of the balloon is 6.23 liters, what is the absolute pressure of the air in the balloon?
Answers
Answer:
pressure = 1.014atms
Explanation:
use ideal gas
PV=nRT
P = (0.250 x 0.08206 x 308)/(6.23)
P = 1.014 atm