Answer:
4 mol
Explanation:
Given data:
Number of atoms of He = 2.4 × 10²⁴ atoms
Number of moles of He = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.4 × 10²⁴ atoms × 1mol / 6.022 × 10²³ atoms
0.398× 10¹ mol
3.98 mol ≅ 4 mol
________is the base unit for length in the metric system
Answer:
metric system
Explanation:
In the metric system, the basic unit of length is the meter. A meter is slightly larger than a yardstick, or just over three feet. The basic metric unit of mass is the gram. Finally, the basic metric unit of volume is the liter.
rapidly expanding air molecules near a bolt of lighting cause a sound that is referred to as blank
Answer:
Thunder!! Hope this helps!!
Atoms have been traditionally viewed as being composed of three different types of particles: protons, neutrons, and electrons. However, research done by Louis de Broglie and expanded upon by Erwin Schrödinger changed how scientists viewed electrons. How has our increased understanding of the electron led to current atomic models?
Answer:
See explanation
Explanation:
Before the advent of the wave-particle duality theory proposed by Louis de Broglie, there was a sharp distinction between mater and waves.
However, Louis de Broglie introduced the idea that mater could display wave-like properties. Erwin Schrödinger developed this idea into what is now known as the wave mechanical model of the atom.
In this model, electrons are regarded as waves. We can only determine the probability of finding the electron within certain high probability regions within the atom called orbitals.
This idea has been the longest surviving atomic model and has greatly increased our understanding of atoms.
Explain, in your own words, what volumic mass is?
Answer:
Volumic mass is the density of a substance in its mass per unit volume. The symbol most often used for density is p.
If you were to descend through the ocean in a submersible, what changes in the ocean water could you observe?
Answer:
it would become darker. there would be a higher level of water pressure. and there would be less animals, or different alimals.
Hello help pleaseeee
Answer:
1) Non metals
2) The melting point increase as we go down the group.
3) The boiling point also increase as we go down the group.
4) The halogens grow darker as we move down the group.
5) The same happens for Iodine as the boiling point and melting point increase as we go down the group.
6) Bromine is more reactive than Iodine as because the size of iodine is greater than that of Bromine.
7) The size of atoms become bigger and larger.
8) Nucleus of every atoms of different elements contain neutron and proton and the nucleus is covered by shells.
9) Because they are placed vertically second from the right in the periodic table.
queries comment me!!
Answer:
1) Non metals
2) The melting point increase as we go down the group.
3) The boiling point also increase as we go down the group.
4) The halogens grow darker as we move down the group.
5) The same happens for Iodine as the boiling point and melting point increase as we go down the group.
6) Bromine is more reactive than Iodine as because the size of iodine is greater than that of Bromine.
7) The size of atoms become bigger and larger.
8) Nucleus of every atoms of different elements contain neutron and proton and the nucleus is covered by shells.
9) Because they are placed vertically second from the right in the periodic table.
Explanation:
PLEASEEEE HELPP
If 359 mL of a gas were contracted to only 269 mL, what would be the initial temperature of it if it measured 422 K after the change?
I NEED IT FAST!!
Answer:
T₁ = 563.19 K
Explanation:
Given data:
Initial volume = 359 mL
Final volume = 269 mL
Final temperature = 422 K
Initial temperature = ?
Solution:
The given problem will be solve through the Charles Law.
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
T₁ = V₁T₂ / V₂
T₁ = 359 mL × 422 K / 269 mL
T₁ = 151498 mL.K / 269 mL
T₁ = 563.19 K
Identify the common name of this free-living organism.
Tubular organism with tentacles surrounding its mouth; a cnidarian
Hydra
SORRY I DON'T KNOW CORRECT BUT
I THOUGHT THATH THIS IS A CATEPILLAR
PLEASE THANKS THIS ANSWER
Help Please ! A substance that flows to the bottom of its container. Which option accurately describes this substance:
A) It can be a liquid or a solid
B) It is a solid or a gas
C) It is a gas
D) It is a liquid
Answer:
It is a solid or gas
Explanation:
solid or gas flow to the bottom of its container
How many atoms are in a molecule of RSq?
pleaseee help haha im timed
Answer: aerobic respiration converts about 40% of the available energy of glucose into ATP!!!
1. How is the atom count for each element on the reactant side of a balanced chemical equation related to the atom count for each element on the product side of the same equation?
Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Thus there are 4 atoms of hydrogen on reactant as well as product side.
Also there are 2 atoms of oxygen on reactant as well as product side.
what volume of a 6.0% W/V glucose (C6H6O6) solution can be prepared using 185g of glucose?
Volume of solution : = 3083.3 ml = 3.0833 L
Further explanationGiven
a 6.0% w/v
185 g of glucose
Required
Volume of solution
Solution
% w/v : the mass of solute in a volume of solution or 1 g solute in 100 ml of solution
Can be formulated :
% w/v = (mass solute(g) : volume solution(ml)) x 100
Mass of solute = mass of glucose = 185 g
The volume of solution :
= 185 g : 0.06
= 3083.3 ml
= 3.0833 L
CHEMISTRY QUESTIONS // 30 POINTS
WILL GIVE BRAINLIEST
1. All nonmetals (except hydrogen) have 8 valence electrons?
True or False
2. The N^-3 ion is classified as a(n) ____ and has ____.
A. anion, 8 valence electrons
B. cation, 8 valence electrons
C. anion, 15 valence electrons
D. anion, 3 valence electrons
3. If two nonmetals react to form a compound and have very different _____ they form ____ bonds. If there is a small difference, then they form ____ bonds.
A. ionization energy; covalent; nonpolar ionic
B. electronegativity; nonpolar covalent; polar covalent.
C. ionization energy, ionic, nonpolar covalent
D. electronegativity, polar covalent, nonpolar covalent.
Answer:
yesyeysesyesyesyesteys
How is this different than what happens when water changes from a liquid to
a solid?
ASAP PLEASE I NEED TO BALANCE THEM PLZ HELP IM FAILING THANKS ILL GIVE BRAINLIEST
Answer:
4H₂O(l) → 4H₂(g) + 2O₂(g)
Balancing equations
1. 3Fe(s) + 4H₂O(g) → Fe₃0₄(s) + 4H₂(g)
2. 2AlBr₃(aq) + 3Cl₂(g) → 2AlCl₃(aq) + 3Br₂(l)
3. 2HNO₃(aq) + Ba(OH)₂(aq) → Ba(NO₃)₂(aq) + 2H₂O(l)
4. 2Al(s) + 3Pb(NO₃)₂ → 2Al(NO₃)₃(aq) + 3Pb(s)
5. 3NaOH(aq) + Fe(NO₃)₃ → Fe(OH)₃(s) + 3NaNO₃(aq)
Explanation:
From the question given, I have been able to balance the chemical equations correctly.
In balancing chemical equations, the chemical equation must have equal number of atoms for each element that are both in the reactant side and in the product side.
For the above to be achieved, the number of atoms in each element will have to be multiplied and added.
A look at the balanced chemical equation above, you will discover that each element has the same number of atoms both in the reactant side and in the product side.
Which two factors are used to calculate the kinetic energy of an object?
Answer:
Mass and Velocity
Explanation:
hope this is the right answer might wrong tho
Answer:
its velocity and mass
Explanation:
I got it right on edg
Which best describes what is represented by images 1 and 2?
Image 1 shows a polymer, and Image 2 shows a monomer.
Image 1 shows a monomer, and Image 2 shows a polymer.
Image 1 shows a macromolecule, and Image 2 shows a synthetic polymer.
Image 1 shows a synthetic polymer, and Image 2 shows a macromolecule.
Answer:
b
Explanation:
im doing a test about it
Answer:
b
Explanation:
Analyzing the results of your experiment includes
6.
What is the acceleration of a 24 kg mass pushed by a 6 N force?
I jus need number 6
The acceleration : 0.25 m/s²
Further explanationGiven
mass = m = 24 kg
Force = F = 6 N
Required
The acceleration
Solution
Newtons' second law :
Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
ΣF = m x a
[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]
Input the value :
6 N = 24 kg x a
a = 6 : 24
a = 0.25 m/s²
Answer:
0.25
Explanation:
its 0.25
How many electrons does one neutrally charged atom of argon have?
A 18
O B.22
C. 40
D. 58
Answer:
A. 18
Explanation:
A neutral charged atom is an atom with 0 charge.
Anyway, first look at the periodic table and find Argon.
After you find Argon, look at its Atomic number.
Its Atomic number is 18.
And a neutral atom of Argon has 0 charge.
So we need 18 electrons for Argon to cancel out and become neutral.
Basic math:
18 +( -18) = 0
Therefore, the correct answer is A. 18
Hope it helped!
One neutrally charged atom of argon (Ar) has 18 electrons. (Option B)
What is argon?Argon is an element with atomic number 18, which means it has 18 protons in its nucleus.
In a neutral atom, the number of electrons is equal to the number of protons. Therefore, a neutrally charged atom of argon will also have 18 electrons orbiting around the nucleus.
The number of electrons in an atom is determined by its atomic number and is essential for the atom's chemical properties and interactions.
Argon is commonly used as an inert gas in various applications, including welding, lighting, and as a protective gas in the manufacturing of electronics.
Learn more about argon at:
https://brainly.com/question/29528737
#SPJ6
What are the eleven elements that are gas freezing?
hydrogen, helium, oxygen, nitrogen, argon, neon, fluorine, chlorine, krypton, xenon and radon i believe >__< not in any order ahaha
Answer:
hydrogen, helium, oxygen, nitrogen, argon and neon, fluorine, chlorine, krypton, xenon and radon
Explanation:
please help, what would the theoretical yield of this be? I don’t understand how to do this.
The theoretical yield : = 28.34 g Al₂O₃
Further explanationGiven
15 g of Aluminum react
Required
The theoretical yield
Solution
Reaction
4Al(s) + 3O₂ (g)⇒ 2Al₂O₃(s)
mol of Aluminum :
mol = mass : Ar Al
mol = 15 g : 26.98 g/mol
mol = 0.556
From the equation, mol ratio of Al : Al₂O₃ = 4 : 2, so mol Al₂O₃ :
= 2/4 x mol Al
= 2/4 x 0.556
= 0.278
Mass Al₂O₃ :
= mol x MW Al₂O₃
= 0.278 x 101.96
= 28.34 g
An alpha particle has the same composition as a A) hydrogen nucleus B) deuterium nucleus C) beryllium nucleus D) helium nucleus
Answer:
Helium Nucleus
Explanation:
Answer:
Helium Nucleus
Explanation:
The density of an object is 2 g/mL and has a mass of 18g, what is the volume of the object?
Answer:
36
orrr
20
Explanation:
36 explanation:18x2=36
20 explanation:18+2=20
The volume of the object : 9 ml
Further explanationGiven
The density of an object : 2 g/ml
Mass : 18 g
Required
The volume
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
V=m : ρ
V = 18 g : 2 g/ml
V = 9 ml
Which of the following is smaller than the atomic radius of oxygen (O)?
A. The ionic radius of sulfur (S)
B. The ionic radius of oxygen (O)
C. The atomic radius of fluorine (F)
D. The atomic radius of sulfur (S)
Answer:
C
Explanation:
Fluorine has a smaller atomic radius than oxygen.
_is the only metal that normally exists on earth as a liquid
Answer:
Mercury
Explanation:
mercury, and it's the only metal that normally exists on Earth as a liquid.
Convert 2.76 atm to mmHg
Answer:2097.5998675091255
Explanation:
what is the mass in grams of a sample of 7.3 x 10^23 molecules of (iodine heptafluoride) IF7
320 g IF₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.3 × 10²³ molecules IF₇
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of I - 126.90 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 7.3 \cdot 10^{23} \ molecules \ IF_7(\frac{1 \ mol \ IF_7}{6.022 \cdot 10^{23} \ molecules \ IF_7})(\frac{259.9 \ g \ IF_7}{1 \ mol \ IF_7})[/tex]Multiply/Divide: [tex]\displaystyle 315.056 \ g \ IF_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
315.056 g IF₇ ≈ 320 g IF₇
1. Which of the following is the amount of space that an object takes up?
1. density
2. volume
3. mass
Answer:
2. volume
Explanation:
Answer:
volume
Explanation: