3. Proton is the subatomic particle which accounts for most of an atom's mass.
4. Electrons are the subatomic particle which accounts for most of atoms volume.
Which of the following lewis structures is correct?
нс
H
a.
b. HH
38:
10:
7:
c.
----
.
"O
H
d.
Answer:
Hope this helps:
Explanation:
Correct H H Part C Sketch the reson.
What is the mass of 5.07 mol N2?
(Answer)grams (3 SF)
Answer:
Mass, m = 141.96 kg
Explanation:
Given that,
Moles = 5.07
Molar mass of N₂ = 28 g/mol
We need to find the mass of 5.07 mol N₂.
We know that,
No of moles is equal to mass divided by molar mass i.e.
[tex]n=\dfrac{m}{M}[/tex]
Where
m is mass of 5.07 mol of N₂
So,
[tex]m=n\times M\\\\m=5.07\times 28\\\\m=141.96\ kg[/tex]
So, the required mass of 5.07 mol N₂ is 141.96 kg.
How many atoms of oxygen are in one molecule of water (H,)?
o one
O two
O four
o three
2 atoms
..................
How does mechanical weather affect rocks?
Mechanical weathering can cause rocks to melt.
Mechanical weathering can relocate rocks to different locations.
Mechanical weathering can cause rocks to break apart into sediments.
Mechanical weathering can change rocks into a different materials.
Answer:
C
Explanation:
Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. ... It slowly widens the cracks and splits the rock
many types of animals have internal skeletons a large part of these animals masses located in them bones as an animal grows its skeleton grows a growing animal must increase the size of its bones to do this animal needs lots of calcium an element important to do structure of Bones how can a growing animal get calcium to make new bones tissue? A-by removing calcium from the air B- by consuming food that contains Calcium C- by making calcium from other elements D- by removing calcium from the bones
Answer: b- by consuming food that contains calcium
Explanation:
describe the difference beetween an extensive and intesive property
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.
Metal vapor deposition is a process used to deposit a very thin layer of metal on a target substrate. A researcher puts a glass slide in the metal vapor deposition chamber and coats the slide with titanium. After deposition, the glass slide had increased in mass by 2.05 milligrams. Approximately how many titanium atoms were deposited on the glass slide
Answer:
2.58 * 10^19 atoms of titanium
Explanation:
Mass of Titanium ions deposited = 2.05 * 10^-3 g of Ti
Molar mass of titanium = 47.87 g/mol
Number of moles of Titanium deposited = 2.05 * 10^-3 g/47.87 g/mol = 4.28 * 10^-5 moles
Number of atoms of titanium deposited = number of moles of titanium * Avogadro's number
Number of atoms of titanium deposited =4.28 * 10^-5 moles * 6.02 * 10^23 = 2.58 * 10^19 atoms of titanium
The temperature of 100 mL of a gas is increased from
20°C to 120°C while the pressure is held constant.
What is the new volume of the gas?
Answer:
V₂ = 134.11 mL
Explanation:
Given data:
Initial volume = 100 mL
Initial temperature = 20°C (20+273.15 K = 293.15 K)
Final temperature = 120°C(120+273.15 K = 393.15 K)
Final volume = ?
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
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 = 100 mL × 393.15 K / 293.15 K
V₂ = 39315 mL.K / 293.15 K
V₂ = 134.11 mL
Iron metal reacts with elemental oxygen to form rust according to the unbalanced reaction, Fe(s) + O2(g) → Fe2O3(s),. Which of the following statemens does not describe this reaction?
a
This reaction is a synthesis reaction.
b
This reaction is a single replacement reaction.
c
This reaction is a combustion reaction.
d
This reaction is a redox reaction.
Answer:
ok
Explanation:
the answer is b
Convert 1020 mm Hg to atm
Answer:
1.34
Explanation:
How many moles are present in 281 grams of arsenic
A(n) is made up of all the species that live in the same
ecosystem at the same time.
Answer:
Is called a population
Explanation:
Answer:
All the organisms of the same species that live in the same place at the same time are a population. Populations ofspecies that live in the same place at thesame time together make up a community. All the populations and the nonliving components in an environment that interact with each other form anecosystem.
For ionic bonding, the net potential energy between two adjacent ions, EN, may be represented by the sum of Equations 2.8 and 2.9 from the text; that is, The binding energy 0 represents that point where EN is minimized. Derive an expression for the bonding energy in terms of the parameters A, B, and n. (Hint: first differentiate and derive an expression for r0, the equilibrium interionic spacing, in terms of A, B, and n. r
Answer:
- [ A/[A/nB]^1/1-n + B/ [A/nB]^n/1-n].
Explanation:
The mathematical representation for the net potential energy as described in the Question above is given below as;
En = -A/r + B/r^n.
Therefore, let's call the equation above equation (1). Hence, there is the need to differentiate equation (1) above wrt r.
(NB: wrt = with respect to)
Thus, [dEn/ dr] = 0. -------------------------(2).
d [ - A/r + B/r^n]/ dr = 0. -------------------(3).
A/r^2 - nB/r^n+1 = 0 ------------------------(4).
r^2/r^n+1 = A/nB ----------------------------(5).
r^1-n = A/nB -----------------------------------(6).
(1 - n )ln r= ln A/nB ------------------------(7)
ln r = 1/1 - n ln [A/nB] ---------------------(8).
r = e^ln(A/nB)^1/1-n ----------------------(9).
r = [A/nB]^1/1-n. ---------------------------(10).
Thus, put the value in (10) above that is r = [A/nB]^1/1-n into equation (1).
Hence, the bonding energy = - [ A/[A/nB]^1/1-n + B/ [A/nB]^n/1-n].
Which statement best describes most tundra animals?
A. slender and short, so they can move quickly
B. hardly any fur or feathers because they are warm-blooded
C. stocky bodies covered with thick fur or feathers
D. most of their time is spent underground, so they are insulated
Answer:
C. stocky bodies covered with thick fur or feathers
Explanation:
Animals in the tundra generally have stocky bodies covered with thick fur or feathers.
A tundra is a very cold biome. In fact, it is the coldest of all the biomes found on the earth. This region is found in the Arctic and other parts of the world. It is treeless, very cold and has little to no precipitation all year round.
Animals here must be highly adapted to the cold all year round. They must possess a stocky body with added layer of fats so as to insulate them from losing heat. Their thick feathers and furs serves are great advantage for them also in conserving bodily heat. Examples of animals here are bears, foxes etcHELP ME PLZZZZZZZZZZZZZZZZZZZ
Air pressure decreases with increasing altitude. In other words the higher up in the atmosphere you go, the thinner the air is.
True
False
Answer:
True
hope this helps
Explanation:
how many moles are there in 1.2044x 1024 atoms of hydrogen
Answer: 2 moles as atoms, but would normally be 1 mole H2
Explanation:
1.2024x10^24/6.02214076 = 2 moles
but 1 mole H2
Please help me with these 3 questions with will be giving out brainiest
Answer: All of them are true
Is elemental copper a pure substance
Answer:
yes
Explanation:
copper is a pure substance in any form
What is the formula for nickel(III) carbide?
Answer:
Ni3C
Explanation:
WILL MARK BRAINLIEST
What is the next smallest classification group after Order? ________
What is the smallest classification group?________
Worth 100 points if able to help, please! (show work if possible)
Answer:The answer would be 2 sorry i cant show the work right now
Explanation:
Answer:
2
Explanation:
1 Srcl (aq) + 1 H,60,(aq) → 2 HCl(aq) + 1 Srso (s)
What is the mass of strontium chloride that reacts with 300.0 g of sulfuric
acid?
Answer:
Mass = 245.72 g
Explanation:
Given data:
Mass of SrCl₂ react = ?
Mass of H₂SO₄ = 300.0 g
Solution:
SrCl₂ + 2H₂SO₄ → 2HCl + Sr(HSO₄)₂
Number of moles of H₂SO₄:
Number of moles = mass/molar mass
Number of moles = 300.0 g/ 98.079 g/mol
Number of moles = 3.1 mol
Now we will compare the moles of SrCl₂ and H₂SO₄.
H₂SO₄ : SrCl₂
2 : 1
3.1 : 1/2×3.1 = 1.55 mol
Mass of SrCl₂:
Mass = number of moles × molar mass
Mass = 1.55 mol × 158.53 g/mol
Mass = 245.72 g
A 558 mg of a mixture of fluorene and benzoic acid was weighed out and subjected to an extraction and recrystallization. After this purification was completed the product crystals were dried and analyzed. The purification procedure produced 185 mg of fluorene and 144 mg of benzoic acid. Calculate the percent composition of this mixture.
Answer:
See explanation
Explanation:
Mass of mixture of fluorene and benzoic acid = 558 mg
Mass of pure fluorene after purification = 185 mg of fluorene
Mass of pure benzoic acid after purification = 144 mg of benzoic acid
Percentage of fluorene int he mixture = 185mg/558mg * 100 = 33.15 %
Percentage of benzoic acid in the mixture = 144mg/558mg * 100 = 25.81 %
Percentage of impurities = 100% - [33.15 + 25.81]
Percentage of impurities = 100 - 58.96
Percentage of impurities = 41.04 %
how are point source and nonpoint source pollution harmful when it rains
Answer:
Nonpoint source pollution is difficult to control because it comes from many different sources and locations. Most nonpoint source pollution occurs as a result of runoff. When rain or melted snow moves over and through the ground, the water absorbs and assimilates any pollutants it comes into contact with.
If Jim has a mass of 70 kg and is running at a rate of 6 m/s, what would his momentum be?
Answer:
p = 420 kg·m/s
Explanation:
i just looked up momentum calculator
Cellular respiration is? (Single choice.)
A. a chemical reaction that converts energy from food molecules by way of oxygen into a usable energy called ATP.
B. a chemical reaction that converts carbon dioxide and water into glucose and oxygen.
C. a chemical reaction that converts that occurs only in animals.
D. a chemical reaction that occurs only in plants.
There are 235.5 grams of Calcium chloride dissolved in 2.5 liters of solution. What is the molarity of
this solution?
Substance A dissolves in water. What can be said about substance A?
O It is unsaturated.
It is nonpolar.
It is saturated.
It is polar.
Answer:
It is polar.
Explanation:
Water is a polar solvent and it can only dissolve another solute or substance.
As a general rule of solubility "likes dissolves likes".
This implies that when a polar solvent is used, it will dissolve a polar solute.
Also, a non-polar solute will only dissolve in a non-polar solvent.
Water is an example of polar solute. Other solutes such as salt can dissolve in water because they are polar in nature. A non-polar solvent is oil.Which chemical name and formula is a matching set?
Answer:
Chemical compound
Explanation:
can aniline be nitrated directly?
Answer:
Yes.
Explanation:
Hello!
In this according to the attached file, we infer that the aniline can be nitrated by the addition of nitric acid and in presence of sulfuric acid that provides an acidic media. It leads to the formation of o-nitroaniline, m-nitroaniline and p-nitroaniline whereas the major products are the last two due to the steric hindrance.
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