Answer:
at room temperature: -water is in liquid state bcecause of which molecules are freely moving
at 0°C:- it is freezing pointof water in this state water molecule can't move due to which there is no collision and chemical reaction will not take place
Explanation:
if i m right than tag me brilliant
The difference is in the speed of the molecules. At 0°C, the molecules move more slowly than at room temperature as their potential energy decreases.
3. You are walking in Paris alongside the Eiffel Tower and suddenly a croissant smacks you on the head and knocks you to the ground. From your handy dandy tourist guidebook you find that the height of the Eiffel Tower is 300.5 m. If you neglect air resistance, calculate how many seconds the croissant dropped before it tagged you on the head.
Answer:
7.827s
Explanation:
Given that
Height of the Eiffel tower is (h) =300.5m
Acceleration due to gravity (g) =9.81m/s2
From the kinematic equations
s =ut+(1/2)gt2
It is free fall then u =0
Then h =(1/2)gt2
Then the time taken for the croissant dropped before it tagged you on the head. is t =Sqrt(2h/g) =Sqrt(2*300.5/9.81)=7.827s
When naming acids such as HCl, HBr, and HI, the prefix "hydro-" is added and the "ine" of the element is replaced with which of the following suffixes before the word "acid" is added?
Select one:
a. "-ic"
b. "-ate"
c. "-ite"
d. "-ide"
Answer:
a. "-ic"
Explanation:
The correct answer is a. "-ic".
For example:
For HCl, the name is Hydrochloric acid. As you can see, the suffix "-ine" of the element (originally chlorine) is changed to "-ic".Following the same logic, the name for HBr is Hydrobromic acid; and the name for HI is Hydroiodic acid.
Complete the sentence
The Earth’s earliest atmosphere contained large amounts of carbon dioxide. The percentage of carbon dioxide in the Earth’s atmosphere today is ___
A) Less than 1%
B) 5%
C) 21%
D) 78%
Answer:
A) Less than 1%
Explanation:
The answer is approximately 0.04%
If an atom has 32 protons in the nucleus, how many electrons will it have orbiting the nucleus
An atom is neutral as it has the same number of electrons that of protons. So, if an atom has 32 protons i.e. the atomic number of it is 32, then it will have 32 electrons revolving the nucleus.
The total kinetic energy of a body is known as:
A. Convection
B. Potential energy
C. Thermal energy
D. Temperature
Answer: THERMAL ENERGY
Explanation: thermal is also known as heat and the body contains more of heat
hope it helps
describe the formation of covalent bond in methane (5 marks)
Answer: Covalent bonding is when atoms of different elements share electrons
Explanation: Taking Methane CH₄
it contains Hydrogen and Carbon atoms pairing electrons. the electronic configuration for carbon is 2,4 that is to say it has 4 electrons in its valence shell (outer shell) and hydrogen has 1 so carbon shares its four electrons with four hydrogen atoms thus forming a covalent bond. so they now have a stable arrangement of electrons in their outer shell ,thus giving CH₄There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Carbon has an electrical configuration of 2,4. Hydrogen only has one electron in its valence shell, whereas carbon contains four electrons. In order to create methane, carbon forms a covalent connection with four hydrogen atoms, sharing its four electrons with them.
Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.
To learn more about chemical compound, here:
brainly.com/question/26487468
#SPJ2
How does the alcohol enter the body? Describe the process. Where does most of the absorption take place?
Explanation: Once swallowed, a drink enters the stomach and small intestine, where small blood vessels carry it to the bloodstream. Approximately 20% of alcohol is absorbed through the stomach and most of the remaining 80% is absorbed through the small intestine.
solve this question please!
I don't know the answer ?
gujarati (language)
7. (a) Using two examples, explain how covalent compounds are formed. [4 marks]
(b) State three physical properties of covalent compounds. [3 marks]
(c) Describe an experiment how you can carry out an experiment to investigate one of the properties mentioned above. [3 marks]
8. (a) Using two examples, explain how covalent compounds are formed. [14 marks]
(b) State three physical properties of covalent compounds.[3 marks]
Describe an experiment how you can carry out an experiment to investigate one of the properties mentioned above. [3 marks]
Answer; a) Covalent compound are formed when atoms of different molecules share electrons in order to be stable either by losing or gaining electrons
eg.. HCL hydrogen chloride , a chlorine atom has 7 electrons on its outer shell and hydrogen has 1 so when this two pair they become covalently bonded. chlorine shares one electron with the hydrogen atom ,thus to say both now have a stable arrangement of electron in their outer shell.
methane CH4 the carbon atom has 4 electrons and hydrogen has 1 so carbon would need 4 more and hydrogen would need 1 more so carbon pairs with 4 hydrogen atoms making it 8 and hydrogen 2 so they now have a stable arrangement ,thus the carbon atom shares with 4 hydrogen atoms.
b) some physical properties are
i)they have low melting and boiling points
ii)their insolubility in water
iii) they are non conductors of electricity
c) an experiment using their melting and boiling point
EXPERIMENT; lets use the covalent molecule carbon monoxide CO
when you apply heat and it tend to melt at a -199 degree celsius then it is a covalent molecule
and when it starts to boil at -191 degree celsuis then its sure a carbon monoxide covalent molecule
explanation; the reason for its low melting point and boiling point is because the attraction between the molecule is very low so it doesn't need much energy to break up the lattice between them.
HOPE THIS HELP if you need more explanation feel free to comment in the comment section
Methane is approximately 23 times more powerful than carbon dioxide as a greenhouse gas. Which are significant sources of methane emissions
Answer:
anthropogenic sources like landfills, agricultural activities,coal mining and combustion and some sources are natural ones
draw the flow chart of production of silk from silk moth
please help....
no links or get reported
Too lazy to draw sorry lol.
#CarryOnLearning
I actually just looked it up via image search.
just copy by hand either of the flow charts.
if you can, use colors to fill. makes it more interesting to look at
and define a circle (or rather a few points on it) to draw it neatly. the defined points can later be transformed into the arrows.
From the options provided for each element below, choose the properties that it may have based on its location in the periodic table.
Fluorine (F):
highly reactive nonmetal
shiny
a conductor
Answer:
highly reactive nonmetal
Explanation:
Fluorine is a member of group 7 elements on the periodic table called HALOGENS. Just like other members of its group like chlorine, iodine etc., fluorine is a nonmetallic element. Fluorine is regarded as the most reactive element on the periodic table because of its affinity to accept electrons i.e. most electronegative element.
According to this question, fluorine is an highly reactive nonmetal based on its location on the periodic table.
Answer:
highly reactive nonmetal
Explanation:
edge 21
is an atom of a metal?
Answer:
An atom of an element that exhibits typical metallic properties, being typically shiny, with high electrical and thermal conductivity. ... A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polymeric sulfur nitride.
Why is the charge on a charged sphere distributed uniformly over its surface?
-Similar charges seek to be the minimum distance possible from each other.
-Opposite charges seek to be the maximum distance possible from each other.
-Similar charges seek to be the maximum distance possible from each other.
-None of the above
Answer:
Similar charges seek to be the maximum distance possible from each other
Explanation:
On a charged sphere, there are like charges and these like charges are repelled by each other to the far ends of the sphere. Hence they are distributed uniformly in the sphere.
How to find the percentage abundance of isotope
Answer:
Answer below (in explanation)
Explanation:
First find the average atomic mass of the element in question (on the periodic table)
Set up the relative abundance formula: (M1)(x) + (M2)(1-x) = M(E)
Where M1 = Mass of the first isotope, X = Relative abundance, M2 = mass of the second isotope, M(E) = Atomic mass of the element
Plug in your values (i'll use nitrogen as an example) :
(background info: The mass of one isotope, nitrogen-14, is 14.003 amu and another isotope, nitrogen-15, is 15.000 amu, find the relative abundance of the isotopes.
14.003x + 15.000(1-x) =14.007
Use algebra and solve for X. First use distributive property, combine like terms, and solve for X.
It would equal X = 0.996. Multiply by 100 to get a proper percentage and the percentage abundance of Nitrogen-14 is 99.6%
This way of solving is limited to 2 isotopes only.
Done
Balance the following equation :
Sodium + water sodium hydroxide + hydrogen with steps
Answer:
2Na + 2H2O → 2NaOH + H2
Explanation:
This is the balanced equation of,
Sodium + water → sodium hydroxide + hydrogen
The molar mass of oxygen(O) is 32g. What is the mass of 1.05*10^25 molecules of O²
Answer:
Hope that will help you
Explanation:
Text me for more answers
A 150 j of energy is added to a system that does 50 j of work is done. By how much wiull the internal energy of the system be raised?
Answer:
thnx for the points too muchee
Explanation:
Answer:
3 internal energyExplanation:
[tex]{hope it helps}}[/tex]
What is the difference between a continuous spectrum and a line spectrum? Give a source of each
kind of spectrum!
If a substance contains ionic bonds, then its properties would include
Answer:
If the substance has high melting/boiling point, if it requires high temperature to dissociate into simpler particles, if it's structure is hard and if it conducts heat and electricity quite frequently, then it would be "Ionic compound" otherwise, it will be covalent compound.Explanation:
If a substance contains ionic bonds, then it’s properties would include high melting and boiling points, a crystalline structure, the ability to dissolve quite easily in water, the ability to conduct electricity, have good insulation and lastly be quite hard and brittle.
If my answer was helpful, would you consider giving me a “Brainliest”?. Thank you :)
The formal charge and P-O bond order in PO43- respectively are 0.6, -0.75 -0.75, 1.25 1.0, -0.75 1.25, -3 98.
Answer:
-0.75 , 1.25
Explanation:
Number of electrons present in valence shell,
P-O = 5 + 8 = 13
Number of electrons involved in bond formation,
13 - 3 = 10
Number of bonds in PO3 - 4ion = 102
Average P-O bond = 1.25
Average formal charge on Oxygen atom is -0.75
Help me please I really need this tomorrow
9.D
10.A
11.C
12.B
13.D
14.C
15.A
16.A
18.C
during summer water kept in an earthen pot become cool because of the phenomenon of
During summer water kept in an earthen pot become cool because of the phenomenon of evaporation.
The first excited state of a particular atom in a gas is 6.1 eV above the ground state. A moving electron collides with one of these atoms, and excites the atom to its first excited state. Immediately after the collision the kinetic energy of the electron is 3.2 eV. What was the kinetic energy of the electron just before the collision
Answer:
The kinetic energy of the electron just before the collision is 9.3 eV.
Explanation:
We can find the kinetic energy of the electron before the collision can be found by energy conservation:
[tex] E_{i} = E_{f} [/tex]
[tex] K_{a_{i}} + K_{e_{i}} = K_{a_{f}} + K_{e_{f}} [/tex] (1)
Where:
[tex]K_{a_{i}}[/tex]: is the initial kinetic energy of the atom
[tex]K_{a_{f}}[/tex]: is the final kinetic energy of the atom = 6.1 eV + [tex]K_{a_{i}}[/tex]
[tex]K_{e_{i}}[/tex]: is the initial kinetic energy of the electron =?
[tex]K_{e_{f}}[/tex]: is the final kinetic energy of the electron = 3.2 eV
By solving equation (1) for [tex]K_{e_{i}}[/tex] we have:
[tex]K_{a_{i}} + K_{e_{i}} = (6.1 eV + K_{a_{i}}) + 3.2 eV[/tex]
[tex] K_{e_{i}} = 6.1 eV + 3.2 eV = 9.3 eV [/tex]
Therefore, the kinetic energy of the electron just before the collision is 9.3 eV.
I hope it helps you!
Raw material for rayon comes from
a.cellulose
b.coal
c.petroleum
d.animal bones
Explanation:
the raw material for the rayon come from is cellulose
how many distinct monochlorinated products can result when methylcyclohexane is subjected to free radical chlorination under UV light
Answer:
How many distinct monochlorinated products can result when methylcyclohexane is subjected to free radical chlorination under UV light.
Explanation:
Consider 1-methylcyclohexane:
Its structure is shown below:
It has primary [tex]1^o[/tex], secondary [tex]2^o[/tex]and tertiary [tex]3^o[/tex] carbons as shown in the image.
So, the following mono chlorinated product will be formed.
what is the formula of silver sulphate
Answer:
Ag2SO4
Explanation:
How did Rutherford's gold foil experiment show that Thomson's plum pudding model of the atom was
incorrect?
Answer:
He blasted alpha rays at the gold foils. The Alpha rays are charged positive. When he blasted them the protons deflected and changed the course of them and the electrons surrounding the atom let them through. In the plum pudding model they were supposed to be sprinkled on which was clearly wrong according to that experiment.
Explanation:
How are the boiling point and freezing point of a solvent affected when a solute is added?
Both the boiling point and the freezing point decrease.
Both the boiling point and the freezing point increase.
The boiling point increases, and the freezing point decreases.
The boiling point decreases, and the freezing point increases.
Answer:
this can helps you know the answer
Answer:
C.) The boiling point increases, and the freezing point decreases.
Explanation:
It is known that oxygen contains 1 percent of the air. If 50 liters of wind, how much oxygen is needed? *
Answer:
25 PRECENT
Explanation:
