Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.8 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{4.8}{6.02} \\ = 0.797342192 \\ [/tex]
We have the final answer as
8.0 × 10-¹ molesHope this helps you
Answer: D. 8.0 x 10^-1 moles
Explanation:
which element in the alkali group will have the lowest first ionization energy?
Fluorine
Explanation:
F- has the lowest ionisation energy
Given the following equation:
2KMnO4 → K2MnO4 + MnO2 + O2
How many grams of KMnO4 are required to produce
1.60 grams of O2?
g
Mass of KMnO4 required : 31.607 g
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
2KMnO₄ → K₂MnO₄ + MnO₂ + O₂
mol of O₂ :
[tex]\tt \dfrac{1.6}{16}=0.1[/tex]
mol ratio KMnO₄ : O₂ = 2 : 1
mol of KMnO₄ :
[tex]\tt \dfrac{2}{1}\times 0.1=0.2[/tex]
mass of KMnO₄ :
MW KMnO₄ : 158,034 g/mol
[tex]\tt mass=0.2\times 158,034 =31.607~g[/tex]
Changes in which two characteristics can indicate a physical change?
A. Shape
B. Reactivity
O C. State
D. Flammability
Changes in shape and state are the two characteristics which indicate a physical change.
What are physical changes?Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
Learn more about physical changes,here:
https://brainly.com/question/17931044
#SPJ2
All mutations _____.
A glass of unsweetened lemonade has a mass of 255 grams. A spoonful of sugar is massed before stirring It Into the lemonade and you find that
It has a mass of 25 grams.
• How much mass will the sweetened lemonade have once you stir in the sugar?
• State and explain the science concept that leads you to this answer.
Answer:
270
Explanation:
Once you add more mass to something the mass doesn’t go away you add more mass.
hope this helps!
A quantity of gas under a pressure of 302kpa has a volume of 600cm3. The pressure is increased to 604kPa, while the temperature is kept constant. What is the new volume?
Answer:
V₂ = 300 cm³
Explanation:
Given data:
Initial pressure = 302 KPa
Initial volume = 600 cm³
Final pressure = 604 KPa
Final volume = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
302 KPa × 600 cm³ = 604 KPa× V₂
V₂ = 181200 KPa.cm³ / 604 KPa
V₂ = 300 cm³
Arrange the events in the life of a star in the correct order.
Answer:
1. The temperature increases in the center of a nebula, and nuclei begin to fuse.
2. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.
3. The star stays in the main sequence stage for a long time.
4. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.
5. Heavy elements are created when the supernova explodes.
6. All that remains of the star now is the core. In some cases, the star turns into a black hole.
Explanation:
.
The earth is slightly tilted on its axis. How much is it tilted?
23.5 degrees
28 degrees
20.5 degrees
25 degrees
i really need these answered!!
Explanation:
3)
Equation -
3F₂ (g) + 2AlBr₃ (s) → 3Br₂ (l) + 2AlF₃ ↓
4)
When sulphur dioxide gas reacts with oxygen then it forms sulphur trioxide gas.
Equation -
2SO₂ (g) + O₂ (g) → 2SO₃ (g)
The elements of a group have the same number of
in their
shell.
A outer
B. electrons
c.inner
D. protons
Answer:
B
Explanation:
electron.elements of the same group have the same electrons
Why does citric acid make water cold?
The reaction between citric acid and water is endothermic.
There are two types of reactions based on whether heat is evolved or absorbed by a reaction. Those two types are:
Endothermic reaction - in this reaction, heat is absorbed thereby making the reaction vessel to feel cold. Exothermic reaction- in this type of reaction, heat is evolved thereby making the reaction vessel to feel warm.The dissolution of citric acid in water is an endothermic reaction. The water feels cold because heat is absorbed from the surroundings as the reaction proceeds.
For a definition of endothermic and exothermic reactions see
https://brainly.com/question/20877696
Why is it important for scientists to replicate each other’s experiments?
A sector of a circle has an area of 132m². if the angle of the sector is 105,°,calculate the radius of the circle
determine the mass of co2 prodeced by burning enough carbon to produce 5 x 10^2 kj
Self-disclosure must be ____________.
a.
brief
b.
dishonest
c.
voluntary
d.
one-sided
Answer:a
Explanation:
Answer:
C
Explanation:
One must be willing to self disclose for them to self disclose.
How can planting vegetation help reduce global warming?
Answer:
Oxygen production.
Explanation:
Which properties are most common in nonmetals
According to the electronic configuration, properties which are most common in non-metals are high ionization energies, high electronegativity and poor conductors of heat and electricity.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
https://brainly.com/question/13497372
#SPJ2
The photograph shows one way individuals work together in groups. What
kind of work is shown in the photograph?
who discovered the electron as a particle?
Answer: Thomson
Explanation: During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897.
Kendrick goes to his neighborhood gym to exercise. The process of cellular respiration makes it possible for him to run on the treadmill and to lift weights. What do Kendrick's cells do during cellular respiration?
A.His cells convert kinetic energy into chemical energy.
B.His cells use oxygen to break down food molecules to release energy.
C.His cells absorb light energy through the chlorophyll in their chloroplasts.
D.His cells combine water and carbon dioxide to produce oxygen and glucose.
Answer:
i think it is B
Explanation:
His cells use oxygen to break down food molecules to release energy.
Simple chemistry question please help. Look at image.
It's the last one. They all have the same number of electrons in their outer ring. They're also called valence electrons.
Hope this helped!
ROY G BIV arranges the colors of the rainbow *
In order of increasing energy
In order of increasing wavelength.
O In order of decreasing frequency.
Answer:
Wavelengths..
Explanation:
The colors we see always go from red, which is least refracted, through orange, yellow, green, blue, indigo and violet -- Roy G Biv. The blue, indigo and violet wavelengths are refracted the most as sunlight passes through raindrops.
Question 17 of 25
Which of the following is the energy of motion?
A. Nuclear energy
B. Chemical potential energy
C. Kinetic energy
D. Gravitational potential energy
SUOMI
Answer:
c. kinetic energy
Explanation:
C5h12+o2=co2+h2 balance equation
The ___ blends into outer space.
Select one:
O a. troposphere
O b. stratosphere
O c. mesosphere
O d. exosphere
Answer:
Exosphere
Explanation:
it is found at the end reaching outer space
HELP FAST PLEASE!!
Producers are able to produce more of a good and to make more profit from __________. A. high prices B. limited demands C. high production costs D. government involvement
Answer:
the answer is A
Explanation:
i took the test on edg. sorry it is so late:(
Answer:A
Explanation:
The correct name for the molecule 14Cl7 is:
a. triiodide heptachloride
b. lodine chloride
c. tetraiodine heptachloride
d. quadiodine septachloride
Kinetic Theory: Tutorial
Activity
In this activity, open the Gas Properties simulation and follow the instructions provided with the questions below.
Part A
Using the controls along the right side of the simulation, under "Options," check the second box to select the temperature of the new particles
Then move the slider at the bottom to its lowest setting (50 K). Next, choose temperature as your constant parameter at the top. In the "Gas in
Chamber" box, add "light species" particles until about 200 are in the box. Finally, quickly add about 20 "heavy species" particles to the box.
Carefully observe how they spread across the chamber through time. What do you think causes the heavy particles to spread throughout the
chamber? What can you say about the direction of their movement?
Answer:
The heavy particles move across the chamber because of the diffusion property of gas particles. The particles move in straight lines and change directions only when they collide with other molecules or the walls of the chamber.
Explanation:
Which statement describes the blood type of a person with the alleles IAi?
It is type AB because I and i are codominant.
It is type AB because A and i are codominant.
It is type A because i is dominant and A is recessive.
It is type A because A is dominant and i is recessive.
Answer:
b
Explanation:
Answer:
The answer is B
Explanation:
The solubility of gas in water at 25 C and 1.0 atm pressure of oxygen is 0.061 g/ L. What would the pressure be if the solubility of oxygen water at 25 C is 0.075 g/L
Answer:
P2 = 1.2265 atm (Approx)
Explanation:
Given:
Water temperature = 25 degree Celsius
Pressure = 1 atm
So,
P1/P2 = C1/C2
1 / P2 = 0.061 / 0.075
P2 = 1.2265 atm (Approx)
