How many moles are there in 3.9 grams of potassium
Answer:
0.0997485824191857
Explanation:
Potassium in 1 mol is 39.0983.
Divide 3.9 by 39.0983.
A geologist finds an area with a lot of slate, a type of metamorphic rock, on the surface of the land. What might this indicate about Earth's history in this area?
Answer:
Explanation:
Two things that can be deduced by this finding would be that the location was most likely a very muddy area with lots of clay minerals, as well as having lots of crustal movements. This is because slate is created when crustal movement buries clay minerals and other materials in the crust of the Earth. This is later melted and squeezed together from the sheer heat that is applied being so far underground. Therefore, creating what we now know as Slate.
3. Which element is the least reactive?
A. Na B. Ca C.P D. Ne
Answer:
Noble gases are the least reactive, so that is He, Ne, Ar, Kr, Xe, Rn, Og.
Explanation:
element with same number of valence electrons as iodine:
Fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) all have the same number of valence electrons.
What is valence electron ?
Valence is nothing but a number of electrons in an atom which may either lose or gain to attain the nearest noble gas or inert gas state of electronic configuration.
The valence electrons are contain more energy compared to the electrons present in inner orbits, so they are the part of chemical reaction.
The number of valence electrons of an atom helps to determine a specific chemical properties, like valence or valency, the formation of bonds with other elements, gives an idea of how readily the atoms can form bonds.
Some major characteristics of a valence electron include the valence electron exists only in the outermost electron shell, exist in the inner shell of a transition metal, the atom with the shell of valence electrons are chemically inert, either absorb or release energy in the form of a photon, determine electrical conductivity .
For more details valence electron, visit
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why do some react so strongly against Charles Darwin's idea
Some people reacted so strongly because it went against their cultures and religious beliefs
As you climb through the upper stratosphere, the temperature: increases decreases in constant
Answer:
It increases.
Explanation:
I hope this helps.
Answer:
Increases
Explanation:
Hope this helps :)
The domain level divides
organisms based on the
differences between
eukaryotes and
prokaryotes. Eukaryotes
have a nucleus in their
cells. Which BEST describes
prokaryotes?
A. Prokaryotes are nonliving things.
B. Prokaryotes do NOT have a nucleus.
C. Prokaryotes include all plant life.
D. Prokaryotes cannot reproduce.
Answer:
B. Prokaryotes do NOT have a nucleus.
1Kr + 3 F2 → 1KrF6
2. How many moles of fluorine are required to
produce 3.0 grams of KrFo?
Answer: 0.045 moles of [tex]F_2[/tex] will be required to produce 3.0 grams of [tex]KrF_6[/tex].
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} KrF_6=\frac{3.0g}{198g/mol}=0.015moles[/tex]
The balanced chemical equation is:
[tex]Kr+3F_2\rightarrow KrF_6[/tex]
According to stoichiometry :
1 mole of [tex]KrF_6[/tex] is produced by = 3 moles of [tex]F_2[/tex]
Thus 0.015 moles of [tex]KrF_6[/tex] will be produced by=[tex]\frac{3}{1}\times 0.015=0.045moles[/tex] of [tex]F_2[/tex]
Thus 0.045 moles of [tex]F_2[/tex] will be required to produce 3.0 grams of [tex]KrF_6[/tex].
Please help me with this question.
Answer:
B or c
Explanation:
It might bee
Write a summary paragraph explaining limiting and excess reactants and how you can tell which is which.
Will mark as Brainliest if it's correct and if it's not copied and pasted from the internet :)
Earth is removed from the top to reveal the coal. Which type of coal mine does this describe? undersea subterranean drill strip
Answer:
Strip
Explanation:
Strip mining removes Earth in long strips from the top to reveal the coal. This earth to be removed is known as 'overburden'. The overburden from the first strip is referred to as out-of-pit dumping. Strip mining is a part of surface mining.
Strip mining destroys forests, landscapes, forests and wildlife habitats as trees and plants are removed from the mining area.
Therefore,
this describes the Strip coal mine.
Answer:
strip Mining.
Explanation:
Explain why electrons in the outer
energy levels are less stable than
those closer to the nucleus.
Answer:
Explanation:
The electrons in the outer shell can be stripped from their main atom more easy than the inner shell electrons.
2. The air pressure inside a submarine is 0.56 atm. What would be the pressure in
mmHg?
There are some climates in which there are no living things. true or false
Answer:
True
Explanation:
There are some climates in which there are no living things. The average of the weather is the climate.
What is climate ?Climate is a region's averaged long-term weather pattern over a period of time, usually 30 years. More precisely, it is the average and variation of climatic variables over a period of time that can range from a few months to many millions of years.
Every element of our life is impacted by the climate, including our food supplies, transportation systems, clothing choices, and vacation destinations. It significantly affects our future, our health, and our means of subsistence. Climate is the long-term trend of the weather in any given location.
As an illustration, you can anticipate snow in the Northeast in January or hot and muggy weather in the Southeast in July. Climate is this. Extreme values, such as record-breaking high temperatures or heavy rainfall, are also part of the climatic record.
Thus, there are some climates in which there are no living things.
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16. Keesha performed a chemical reaction, and the products looked quite
different from the reactants. She knew the amount of matter had not
changed due to the law of conservation of mass. According to the law of
conservation of mass, what happens in a chemical reaction? *
Answer:
it's the third one
Explanation:
matter can't change, but mass can differ
Part B
Do you think these fish are an example of natural selection among two populations of the same species? Explain your
answer.
B I
x
Font Sizes
А
JE 3
1
Characters used: 0 / 15000
Submit
US 1:04
(hp
Answer:
The two fish are of the same species because they can mate with each other. Also, the characteristics of the blind cave fish enable them to live in caves. Eyes need energy. So, developing bodies with no eyes allowed these fish to function more efficiently.
Explanation:
plato answer
After 60 years, how much Strontium-90 remains
A = 10 g
B= 30 g
C = 5 g
D = 20 g
How many atoms in 12 moles of oxygen
Answer:
7.23 x 10^24 atoms
Explanation:
Use Avogadro's number that states that there are 6.022 x 10^23 particles in one mole:
12 mol O x (6.022 x 10^23) atoms = 7.23 x 10^24 atoms
32 g of CH4 react with 128 g of O2, producing 88 g of CO2. How many grams of water are produced?
Answer:
88 g
Explanation:
32 g of CH4 react with 128 g of O2, producing 88 g of CO2.
Help me pls ,what is this
less
Explanation:
Because the strawberries are going to become liquid l
what is the electrical charge of an atom
what is a liquid? can a liquid change shape or volume
Answer:
A liquid is a substance that is wet and yes it can change shape and volume
Explanation:
please help!! A solid has a melting point if 1710 C is soluble in water, and does not conduct electricity in the solid state. What is the most likely nature of the binding in this solid?
A) Molecular covalent B) Network Covalent C) Ionic D) Metallic
Answer:
d metallic
Explanation:
What type of reaction is 2O3 ----> 3O2?
Answer:
Explanation:
It is a decomposition although it does not look like it. What is happening is that the O3 is giving up one oxygen, and the oxygen on the right is taking on in the form of a new molecule.
Na2O is it ionic or covalent
Answer:
Sodium oxide (Na2O) is an ionic compound
Explanation: can i have brain plz!
CO2 + H2O --> C2H2 + O2
Answer:
C2H2 + 5 O2 = 4 CO2 + 2 H2O
Add / Edited: 27.09.2014 / 25.01.2015
Evaluation of information: 5.0 out of 5 / number of votes: 2
Source: https://chemiday.com/en/reaction/3-1-0-339
Explanation:
I NEED EXPLANATIONSS!!!! Help , i have to past or my teacher will fail me .. again !!
Answer:
Put simply, Asexual reproduction is reproduction without the use of gametes or the number of chromosomes being changed. So they are genetically identical creatures. Some animals include wasps, lizards, sharks, turkeys, and sea urchins.
Sexual reproduction includes chromosomes and gametes being fused, creating genetically different offspring. Examples of creatures that reproduce sexually are humans, chickens, cow, pigs, etc.
Explanation:
Newton's Third Law of Motion states that objects exert equal forces on each other in opposite directions.
Which of the following examples best describe Newton's Third Law of Motion?
O
A. waiter pulls off the tablecloth but the dishes remain
O
B. a ball rolling down and incline plane
C. a baseball bat resting against a wall
D. truck crashes into a car
Answer:
Truck crashes into a car
An ionic bond involves two elements...
Answer:
a metal and a nonmetal element
Explanation:
someone help me on this one pls
Answer:
i believe it is mass and distance
Explanation:
i hope that was correct, good luck by the way.
Answer:
I think it's mass and distance