Answer:
7.94 molesExplanation:
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{4.78 \times {10}^{24} }{6.02 \times {10}^{23} } \\ =7.940199...[/tex]
We have the final answer as
7.94 molesHope this helps you
solutions that are basic are also called what?
Explanation:
A basic solution is an aqueous solution containing more OH-ions than H+ions. In other words, it is an aqueous solution with a pH greater than 7. ... Examples of common basic solutions include soap or detergent dissolved in water or solutions of sodium hydroxide, potassium hydroxide, or sodium carbonate.
Two electrons in the 1s orbital must have different spin quantum numbers to satisfy
Hund's Rule
The Magnetic Rule
The Pauli Exclusion Principle
The Aufbau Principle
Answer: The Pauli Exclusion Principle
Explanation:
The electrons are filled in orbitals of equal energy with one electron entering each orbital until all the orbitals contain one electron with the same spin. The pairing of electrons take place thereafter.
The first electron in an orbital could have +1/2 spin or -1/2 spin. All of the electrons in singly occupied orbitals have the same spin so as to maximize total spin. which is given by Hunds rule.
Two electrons must have opposite spin and thus different spin quantum numbers is given by Pauli's exclusion principle.
Which of the following is true about sound waves and light waves?
A.
All sound waves and light waves are longitudinal waves.
B.
Most sound waves are transverse waves, while light waves are longitudinal waves.
C.
All sound waves and light waves are transverse waves.
D.
Most sound waves are longitudinal waves, while light waves are transverse waves.
Answer:
Most sound waves are longitudinal waves, while light waves are transverse waves
Explanation:
A reaction between 7.88 grams of element X and 23.12 g of elementy produced a compound called XY.
How many grams of XY were produced?
Answer:
30 g
Explanation:
According to Mendeleev's theory, the total mass of the reactants and products are the same.
the more particles a substance has at a given temperature the more thermal energy it has true or false
Answer:
[tex]\huge\boxed{\sf True}[/tex]
Explanation:
Temperature and thermal energy are in a direct proportion which means that if temperature of a substance increases, its thermal energy also increases and vice versa.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807How many molecules of NO2 could be produced from 25 molecules of O3? please explain so I and others could understand how you got the answer (100points)
Further explanation
Given
25 moles of Oxygen(02)
Required The number of molecules
Solution Reaction
2NO+02 → 2NO2
From the equation,
mol NO2: = 2/1 x mol O2 = 2/1 x 25moles = 50 moles
The number of molecules :
[tex] = 50 \times 6.022 \times 10^{23}[/tex]
[tex] = 3.011 \times 10{²5}[/tex]
Why does moisture appear on the outside of a cold glass of water?
Answer:
it appears because Of condensation
Answer:it is called condensation
Explanation:
Consider the molecules H2O, H2S, H2Se, and H2Te. Which do you expect to have the highest boiling point, and why?
a. H2O, because it experiences hydrogen bonding.
b. H2S, because it dissociates and forms ions.
c. H2Se, because it experiences ion-dipole forces.
d. H2Te, because it has the most electrons to form a dipole.
Answer:
a. H20,because it experiences hydrogen bonding.
Answer:
H2O, because it experiences hydrogen bonding.
Explanation:
I got it right
What type of bond is between the oxygen atoms in the following: O2?
single
double
triple
Answer:
Double bond
Explanation:
How are scented candles made?
Answer:
The aroma from a lighted scented candle is released through the evaporation of the fragrance from the hot wax pool and from the solid candle itself. Like unscented candles, properly-formulated scented candles will primarily produce water vapor and carbon dioxide when burned
Explanation:
How many atoms are in CHOFeNaNPb2
a.7
b.8
c.9
d.10
Answer:
1+1+1+1+1+1+2=8
because
C, H, O, Fe, Na, N are one atom each
+ we have two atoms of Pb because we have an index 2
we just collect them
1 + 1 + 1 + 1 + 1 + 1 +2 =8
A student holds two iron magnets, one in each hand. the south pole of one magnet is pointed toward the south pole of the other magnet. as the magnets get closer to each other, they will-
A) attract more strongly
B) attract more weakly
C) repel more strongly
D) repel more weakly
When the south pole of one magnet is pointed close to the south pole of another magnet, they will strongly repel each other. Therefore, option (C) is correct.
What is a magnet?A magnet is described as a material that generates a magnetic field and this magnetic field is responsible for the considerable property of a magnet. Properties of a kind of force that pulls ferromagnetic materials, such as iron, cobalt, steel, etc., and attracts or repels other magnetic materials.
A permanent magnet can be defined as an object composed of a material that is magnetized and produces its own magnetic field. This type of material can be magnetized, is strongly attracted to a magnet, is called ferromagnetic, and contain the elements iron, nickel, and cobalt.
Each magnet has a set of North and South poles within them. The south pole of one magnet attracts the north pole of another magnet while similar piles such as the south pole of one magnet repel the south pole of another magnet. Similarly, the North pole of one magnet repels the north pole of another magnet when they get closer.
Learn more about the magnet, here:
brainly.com/question/2841288
#SPJ2
The nutritional recommended daily allowance (rda) of calcium is 1,300 mg for a 9-18-year-old. How many grams is this? How many atoms of calcium is this?
Answer:
1.3 grams and I think the atoms of calcium is 7, 829. 9
Explanation:
hope this helps!
HELP. ME!!!!!!!!!!!!!!!
Which of the following compounds has the largest percent by mass of oxygen?
Select one:
a. CO2
b. C6H1206
с. СO
d. CH20
A chlorine atom has 18 electrons and 17 protons. What is this atom called?
Lesson 5.01
Question 1 options:
negative ion
neutral ion
positive ion
nucleus
Answer:
Negative ion
Explanation:
I took the test
The given atom chlorine contains 18 electrons and 17 protons. It have one electron that dominates over the proton number. Thus it have a negative charge and it is a negative ion.
What are ions?Ions are formed by the lose or gain of electrons from neutral atoms. Atoms are neutral in ground state because they contains equal number of negatively charged particles called electrons and positively charged particles protons.
When atom lose an electron, it gains a positive charge because by the lose of an electron, protons dominate by one. Similarly when atom gain an electron they form negative ions, since one more electron leads one extra negative charge.
The number of electrons in Cl atom is `17. When it gains one electron then one unit of negative charge dominates over the 17 protons. Thus it form a negative ion with 18 electrons.
To find more on ions, refer here:
https://brainly.com/question/1488567
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Which two things cause the orbits of planets to be nearly circular?
O A. Inertia
O B. Magnetism
O C. Gravity
O D. Electricity
Answer:
Gravity and inertia
Explanation:
each plant does have magnetism but they are two far away from each other to cause anything to happen. Electricity just dosent make sense.
givin 11 sodium 23, what is the atomic mass
(PLS HELP)
Describe three of your favorite foods. How do they change phases of matter when they are heated?
Answer:
ice.
Explanation:
it becomes a liquid
Question 3
When an electron absorbs energy and jumps it is:
a negative ion
in the ground state
a positive ion
in the excited state
Help please
Answer:
in the excited state
Explanation:
Because in excited state an atom has more energy
Which of the following statements is false?
a) Ionic compounds are brittle because the atoms are in a crystalline arrangement
B)Ionic compounds are brittle because if ions are shifted like charged ions will repel
C) Metals are malleable when the atoms can slide past one another
d)Metals can be bent because their free flowing electrons can rearrange and still hold the atoms together
im pretty sure its A, but not positive, can someone explain?
Answer:
a is write
Explanation:
Why are all ionic compounds crystalline in structure?
Ionic compounds are generally hard, but brittle. ... The repulsive forces between like-charged ions cause the crystal to shatter. When an ionic crystal breaks, it tends to do so along smooth planes because of the regular arrangement of the ions.
What else is produced during the combustion of butane C4H10?
2C4H10 + 130,2 --> 8______ + 10H2O
Can someone help I’ll give s you BRAINLIST !!! I just need help in these question btw it’s science and 6th grade work plzz help meeee
Answer:
More than 2,000 Years Ago, the Greek philosopher Aristotle suggested a model of the solar system. Aristotle's model was geocentric, or Earth-centered. In the model. the sun, stars, planets revolved around the Earth. In 150 AD an astrologer named Ptolemy began to support Aristotle's geocentric model.
In 1543 AD, an astronomer named Copernicus proposed a heliocentric model of the solar system. In this model, the planets revolve around the sun. Due to the invention of the telescope, the solar system could be explored in more detail. Galileo used the telescope to support Copernicus's theory of the sun being the center of the universe.
In the late 1500's, Kepler developed a law that explained planetary motion. Kepler's law is so accurate we still use them today.
Explanation:
Can you show me the rest of the question? I can not see it. Also, I know this is multiple choice fill in the blanks so I might be wrong. I hope that this helped though. This took a lot of research. The websites I used are commented down below. |
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can someone sell me what Asexuality means lol
Answer:
Asexuality is the lack of sexual attraction to others, or low or absent interest in or desire for sexual activity. It may be considered a sexual orientation or the lack thereof. It may also be categorized more widely to include a broad spectrum of asexual sub-identities.
Explanation:
Which of these elements have just one valence electron?
A. Potassium
B. Beryllium
C. Carbon
Answer:
A
Explanation:
potassium because it has valance electrons by giving out proteins
A rock has a mass of 48 grams and a volume of 16 mL. What is the density of the rock?
Answer:
Divide mass by volume. you get 3
Explanation:
A large piece of cork has a density of 0.251 g/cm3 and a volume of 1000.0 cm3. Calculate the mass of the cork.
Answer:
251 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 0.251 × 1000
We have the final answer as
251 gHope this helps you
What is the number of grains of rice in the 40 mL sample? Show all of your work using dimensional analysis.
The number of grains of rice in the 40 mL sample : 880 grains
Further explanationGiven
from recorded data:
mass of 20 grains rice = 0.4 g
mass beaker = 29.5 g
mass beaker+rice=47.1 g
mass only rice = 17.5 g
Required
the number of grains of rice
Solution
Maybe if we use a digital scale with high resolution accuracy we can get the mass of 1 grain of rice
But we still use existing data
To determine the mass of rice in the beaker, we just need to find the difference between the mass of the beaker + rice - beaker, or we can set the scale to zero before we add rice to the beaker.
If we look at this difference, the mass of the rice in the beaker should be :
47.1-29.5 = 17.6 g
Since the data shows that 20 grains of rice mass 0.4 g, so 17.6 g of rice contains:
[tex]\tt 17.6~g\times \dfrac{20~grains}{0.4~g}=880~grains[/tex]
How many moles are in 150.0 grams of Fe2O3
Answer:
its 150 hope this helps
Explanation:
Types of catalyst.....
Plsz.....
Answer:
Explanation:
(1) Homogeneous, (2) Heterogeneous (solid), (3) Heterogenized homogeneous catalyst and (4) Biocatalysts
Which of the following is true about covalent bonding?
Up to 8 electrons can be donated from one element to another
Electrons are donated from the outer shell
Electrons are shared in pairs
All of the above
None of the above
Answer:
Electrons are shared in pairs!
Explanation:
I'm doing learning about Covalent Bonding too:)
