Answer:
All measurements have a degree of uncertaintyregardless of precision and accuracy. This is caused by two factors, the limitation of the measuring instrument (systematic error) and the skill of the experimenter making the measurements (random error).
How many atoms are in 30 grams of sulfur?
Answer:
l think,probably 6.022 X 1023
Answer:
0.93559956338688
Explanation:
imagine you put a balloon on a bottle full of air, then set the bottle into hot water. The balloon would inflate. why?
During a demonstration, a teacher makes a mixture by combining 40mL of methanol and 60mL of water, as shown. The teacher asks students to describe what happens so that they can create a model together
Answer:
Explanation:
The solution is a dilute solution of methanol. It is described as a "40% methanol" concentration which means the solution is 40% of methanol in the solution. In this solution, it is 40% of methanol and 60% of water. If any solution is to be prepared from this model, the solution must have 40% of methanol, hence to prepare a 200 mL of the same model (40%) of methanol solution, the volume of methanol would be 80 mL and the volume of water would be 120 mL.
Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O. Determine its empirical formula.
Answer:
the empirical formula is [tex]H_2NO_2[/tex]
Explanation:
The empirical formula is
The following information is given
It contains 29.17 mass percentage of N
4.20 mass percentage of H
And, 66.63 mass percentage of 0
Now based on the above information, the empirical formula is [tex]H_2NO_2[/tex]
hence, the same is to be considered and relevant too
Considering the definition of empirical formula, the empirical formula is H₂N₁O₂= H₂NO₂
The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers small as possible.
Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O.
Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 29.17 grams of N, 4.20 grams of H and 66.63 grams of O.
Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:
N:[tex]\frac{29.17 grams}{14 \frac{grams}{mole} }[/tex]= 2.08 molesH:[tex]\frac{4.20 grams}{1 \frac{grams}{mole} }[/tex]= 4.20 molesO:[tex]\frac{66.63 grams}{16 \frac{grams}{mole} }[/tex]= 4.16 molesThe empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:
N:[tex]\frac{2.08 moles}{2.08 moles}[/tex]= 1H:[tex]\frac{4.20 moles}{2.08 moles}[/tex]= 2.02 ≅ 2O:[tex]\frac{4.16 moles}{2.08 moles}[/tex]= 2Therefore the H: N: O mole ratio is 2: 1: 2
Finally, the empirical formula is H₂N₁O₂= H₂NO₂
Learn more:
brainly.com/question/21081934?referrer=searchResults brainly.com/question/5115389?referrer=searchResults brainly.com/question/4594902?referrer=searchResults brainly.com/question/13725914?referrer=searchResults brainly.com/question/13599051?referrer=searchResults brainly.com/question/13112542?referrer=searchResultsIn Figure 2.4, what is the total number of electrons that can occupy the n=
3 level? *
3
6
9
18
Answer:
18
Explanation:
The n - level given is 3
To find the number electrons that can occupy this level, we use:
2n²
n - is the energy level.
The energy level here is 3;
2 x 3² = 18
Which of the following statement is true about the crust?
The crust is always made of different materials under the mountains than under the oceans.
The crust is the same thickness both under the mountains and oceans.
The crust is thinner under the mountains than under the oceans.
The crust is thinner under the oceans than under the mountains.
Answer:
The crust is always made of different materials under the mountains than under the oceans.
Explanation:
Right answer
Mark me as brilliant and thank you.
Among the given statements option 4 is correct. The crust is thinner under the oceans than under the mountains. The composition of earth crust should vary from that under oceans.
What is crust ?The earth crust is made of rocks and soil made of different elemental compositions. The crest properties in region may varies in each region. The continental thickness of crest is always thicker than the oceanic crest.
The layer of granitic, sedimentary, and metamorphic rocks that makes up the continental crust is what gives rise to the continents and the continental shelves, or shallow seafloor regions adjacent to their shores. Since it is less dense than the mantle material, it "floats" on top of it.
Even though it is significantly thicker—typically 35 to 40 km vs the average oceanic thickness of roughly 7 to 10 km—continental crust is less dense than oceanic crust. Currently, continental crust covers about 40% of the Earth's surface.
The thinnest continental crust is found in rift zones, where it is finally split and replaced by oceanic crust after thinned by detachment faulting. (both sides of the Atlantic Ocean, for example). Hence, option 4 is correct.
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7. I have 2.50 x 1023 atoms of titanium. How many moles of titanium dol
have?
Answer:
0.42mole
Explanation:
Given parameters:
Number of atoms of titanium = 2.5 x 10²³atoms
Unknown:
Number of moles = ?
Solution:
To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.
6.02 x 10²³ atoms makes up 1 mole of an atom
2.5 x 10²³ atoms will contain [tex]\frac{2.5 x 10^{23} }{6.02 x 10^{23} }[/tex] = 0.42mole
PLEASE HELP ASAP DUE SOON !
Answer:
Physical properties such as size, shape, color, density, magnetism or the ability to sink or float can be used to separate the substances in a mixture.. Filtration is when matter is passed through a filter and the larger particles are separated out.
Explanation:
What are 3 different units of measurement for measuring the amount of space a sample of matter occupies?
Answer:
Liters
Cubic centimeter
Cubic decimeter
Explanation:
The amount of space a matter occupies is the volume of the body. Gases takes up by far the largest amount of space because they fill into any available space.
There are several units of measuring volume but the more common one are:
Liters, Cubic decimeter and cubic centimeter.
The volume of a body can be derived in many ways. Some by measuring and others by indirect quantification.
How do I memorize all the elements on the periodic table?
Answer:
write down each element and what you need to know about it repeatedly, and it will burn into your brain
Explanation:
Help me pls ASAP if you know it thank you!
Answer:ASEXUAL: Single parent, Genetically identical, Replication,Budding, splitting / splicing and plant cutting propogation SEXUAL: Two parents, genetically unique, Humans and Cows
Explanationasexual is one parent or stays the same, sexual is where two combine
the cowardly lion and the hungry tiger objective
Answer:
It is one of the six Little Wizard Stories of Oz. The Cowardly Lion and the Hungry Tiger have grown bored with their guard duty at Ozma's throne in the Royal Palace of the Emerald City. The Lion wants to attack a man and make "chop suey of him." The Tiger longs, at last, to satisfy his hunger for a fat baby.
Explanation:
i hope this help u
1. Which is a property of most molecular compounds?
Answer: Low melting points
Explanation:
Question 1.
Which is a limitation of using cellulose?
A.its lack of mass production
B.its lack of biodegradability
C.its harm to landfills
D.its high cost to recycle
Question 2.
Which refers to a macromolecule that forms as a result of the joining of multiple monomers?
A. amino acid
B. glucose
C. nucleic acid
D. polymer
Question 3
What does the octet rule state that explains why atoms bond?
A. Atom bonds have eight valence electrons to become stable.
B. Atom bonds lose eight valence electrons to become stable.
C. Atom bonds have eight valence electrons to become unstable.
D. Atom bonds to lose eight valence electrons to become unstable.
Question 4
Shameeka is studying for an exam. She took the notes below about calcium and chlorine, which are known to form ionic bonds.
Calcium, which is a metal, donates 2 electrons to chlorine.
The individual calcium atoms become ions with a negative 2 charge.
The bond between calcium and chlorine makes the atoms stable.
Calcium and chlorine attract each other.
Which best describes Shameeka’s error?
A.Calcium is a metal, so it donates protons, not electrons.
B.The individual calcium atom has a positive, not negative, 2 charge.
C.The bond formed makes the atoms unstable, not stable.
D.Calcium and chlorine repel, not attract, each other.
Explanation:
Question 1
D
Question 2
D
*25 POINTS PLEASE HELP ASAP!!!*
What happens when elements chemically combine?
1) All elements retain their original properties
2) New properties are formed
3) Only metals retain their original properties
4) New elements are formed
Answer: b
Explanation:
Where is this gas produced? help ASAP
Answer: Natural gas is produced from onshore and offshore natural gas and oil wells and from coal beds.
Explanation:
What is the Molar Mass of SiO4?
Potassium permanganate, KMnO, and glycerin, C3H5(OH)3, react explosively according to the
following equation:
4 KMnO4, +4 C3H5(OH)5, -7K2CO3, + 7 Mn2O3, +5 CO2, + 16 H2O
What volume of Co2 at STP can be produced from 701,52 g of KMnO4?
The volume of CO2 at STP =124.298 L
Further explanationGiven
Reaction
4 KMnO4, +4 C3H5(OH)5, -7K2CO3, + 7 Mn2O3, +5 CO2, + 16 H2O
701,52 g of KMnO4
Required
volume of CO2 at STP
Solution
mol KMnO4 (MW=158,034 g/mol) :
mol = mass : MW
mol = 701.52 : 158.034
mol = 4.439
mol CO2 from equation : 5/4 x mol KMnO4 = 5/4 x 4.439 = 5.549
At STP 1 mol = 22.4 L, so for 5.549 moles :
=5.549 x 22.4
=124.298 L
carbon paired electrons
Answer:
what about carbon paired electrons? what do you need to know about them?
Explanation:
On a Summer day,Thomas is standing in his driveway waiting for his mother. Energy from the sun is making Thomas hot.This energy I'd being transmitted by three different methods. Which is the following is an example of convection?
Answer:literly same im doing the test. Now and its so hard
Explanation:
Anyone help plz
There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, melting of ice is example of convection type of heat flow.
What is energy transfer in thermodynamics?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
To move any object energy is required so work has to be done by the gas to the piston. Heat can be transferred by three ways conduction, convection and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Melting of ice is example of convection type of heat flow.
Therefore, melting of ice is example of convention type of heat flow.
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Please I need this answer
Answer:
wave c i think
Explanation:
Science and technology affect people's behaviors. Which of the following is NOT a way in which science and technology have affected someone's behavior or choices?
A.
Many people use hand sanitizer.
B.
A college student decides to study all night.
C.
A family cuts down on how much saturated fat they consume.
D.
A local contractor decides to install only water-efficient toilets.
Help please chapter 7.1
Which hypothesis is testable using a scientific experiment? O A. Ancient people liked iron tools better than copper tools. O B. Copper statues look prettier than iron statues. O C. A 100 g iron bar is worth more money than a 100 g copper bar. O D. A copper wire conducts electricity better than an iron wire.
Answer:The answer would be D.
Explanation:
Conductivity can be tested.
What happens when two magnets rappel each other hehe
Answer:
Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet from a thread, the magnet’s north pole points (almost) towards the north direction.
This is because the Earth’s core (its centre) is a large, weak magnet. Your little, strong magnet lines up with Earth’s magnetic core, so it points north. That’s how a magnetic compass works.
A balloon is inflated to a volume of 1.25L .If the temperature of the air inside is cooled from 35°C to 15°C , what will be the final volume of the balloon?
Answer:
V₂ = 1.17 L
Explanation:
Given data:
Initial volume of balloon = 1.25 L
Initial temperature = 35°C
Final temperature = 15°C
Final volume = ?
Solution:
Initial temperature = 35°C (35+273.15K = 308.15 K)
Final temperature = 15°C (15+273.15 K = 288.15 K)
The given problem will be solve through the Charles Law.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 1.25 L × 288.15 K / 308.15 k
V₂ = 360.2 L.K / 308.15 k
V₂ = 1.17 L
Which statement describes the energy and bonding changes as two atoms of fluorine become a molecule of fluorine?
1
Energy is absorbed as a bond is broken.
2
Energy is absorbed as a bond is formed.
3
Energy is released as a bond is broken.
4
Energy is released as a bond is formed.
Answer:4
Explanation: I know because I got it right
Statement that gives description as regards energy and bonding changes between atoms such as fluorine become a molecule of fluorine is : 4:Energy is released as a bond is formed.
Bond energy can be regarded as the amount of energy that is needed in breaking apart a mole of molecules to component atoms.When atoms bond together, they use to attain lower energies compare when they were in individual atoms , hence energy will be released as bond is formed.Therefore, option 4, is correct.
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What is the acceleration of a 5 kg object if a force of 50 N was applied to it?
a
45 m/s2
b
250 m/s2
c
10 m/s2
d
55 m/s2
Answer:
c.10 m/s²
Explanation:
By the newton's second law
Which characteristics describe most nonmetals in the solid phase?
1
They are malleable and have metallic luster.
2
They are malleable and lack metallic luster.
3
They are brittle and have metallic luster.
4
They are brittle and lack metallic luster.
Answer:
4
Explanation:
its a non-metal, dont get confused and pick number 1- it may seem like that’s the answer but remember here we are talking abut the solid phase!
Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.
What are non metals?Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.
The properties of non metals are
Non metals are soft.
Non metals are not malleable that is they can be broken into thin sheets.
Non metals are not ductile they can not be broken into thin wires.
Non metals are brittle in nature that is they can be broken down easily.
Non metals are not lustrous.
Therefore the correct option is option D.
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what atoms do we call radioactive isotopes?
Answer:
Radioisotopes are radioactive isotopes of an element. They can also be defined as atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.
Explanation: