Answer:
56.48 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{3.4 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 56.478405...[/tex]
We have the final answer as
56.48 molesHope this helps you
I wont graduate. Why can light be treated like a particle?
Answer:
maybe "A" but I'm not sure
Light can be treated like a particle becuase it comes in chunks of energy called photons.
Particle nature of lightLight exists in dual form, as wave and particle. Light can exist as a wave becuase it transfer energy from one point to another.
Light can also exist as particle becuase it consists of packs of energy known photons.
Thus, we can conclude that, light can be treated like a particle becuase it comes in chunks of energy called photons.
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Hund's rule states that electrons must spread out within a given subshell before they can pair
up. Explain why Hund's rule is not important to follow for group 13, group 17 (halogens) or
group 18 (noble gas), but it is important for groups 14, 15, and 16.
Answer:
Groups 14, 15, and 16 have 2,3, and 4 electrons in the p sublevel (p sublevel has 3 "spaces" AKA orbitals), because Hunds says one in each orbital before doubling up if you had 2 electrons, group 14, they would both be in the first orbital, with 3 electrons, group 15, two in the first orbital one in the 2nd none in the 3rd. With 4 electrons, group 16, then you would have 2 in the first 2 orbitals and NONE in the 3rd.
Explanation:
If you are in group 13 you only have 1 electron so it can only be in one orbital. with group 17, you have 5 electrons, so 2 in the first 2 in the second and 1 in the 3rd, correct for Hunds rule anyway. Noble gasses, group 18, have 6 elecctrons, so every orbital is full any way you look at it.
10.A certain ion of an atom possesses 16 neutrons, a mass number of 31 and a charge
of-3, this ion then contains:
A. 19 protons
B. 13 electrons C. 12 electrons D. 18 electrons
Answer:
B. 13 electrons
Explanation:
Bcoz protons are the same with electrons and the neutrons too.
True of False: When air is dense, its molecules are packed tightly together.
Answer:
That false they are solids so they don't pack
And i love the movie sci-ki the anime series
The statement "When air is dense, its molecules are packed tightly together" is true.
What is air?Air is a mixture of gases. Air is present in the atmosphere and everywhere except in a vacuum. Air is made up of different types of gases. It is necessary for life because it helps in breathing.
The air is also made up of atoms. The atoms are present in different places according to the temperature and pressure of the atmosphere. The atoms come closer when the temperature is low.
This is called density. The atoms become dense when the temperature is low, the molecules become packed tightly together. The air converts into water molecules or the air freezes. When the temperature becomes high, the molecules go far away from each other, which makes it less dense.
Thus, the statement is true.
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During the displacement reaction a student observe that the metal P can displace Q from its salt solution. But Q cannot displace R from its salt solution. Based on the above observation a) Name the most reactive metal. b) Name the salt formed when P displace Cu from CuSO 4 solution.
Answer:
See the answer below
Explanation:
P can displace Q from its salt solution means that P is more reactive than Q.
Q cannot displace R from its salt solutions means that R is more reactive than Q.
a) There is no information as to which of P and R has the capacity to displace one another from their salt solutions. Hence, the most reactive metal can be either of P and R.
b) When P displaces Cu from CuSO4 solution, the equation can be represented below (assuming that P is monoatomic):
[tex]P + CuSO_4 --> P_2SO_4 + Cu[/tex]
Hence, the product formed is [tex]P_2SO_4[/tex]
What is the complementary DNA sequence to A-T-T-G-C-A?
Answer:
T-A-A-C-G-A or just TAACGA
Explanation:
A=T
G=C
C=G
T=A
This is the answer key to all complementary DNA strands.
Hope this helps you out.
How far could you speed walk in 10 minutes based on the 8m trial
Answer:
The distance covered when speedwalking for 10 minutes based on the 8 meters trial (assuming a speed of 1 m/s) is 600 meters.
Explanation:
The speed of a body is the distance it covers per unit time when it travels. Its formula is given as; speed = distance/time. Its unit is meters per second as distance is measured in meters while time is measured in seconds.
From this formula, the distance covered by a body travelling with a given speed over a specific time can be determined. Distance = speed × time. This formula applies generally in all cases given the speed of the body and the time it travels.
Speed walking means walking as fast as possible without jogging or running. In this experiment, the speed over the 8 meters trial is not given. However, some assumptions can be made.
Assuming the speed while speedwalking is 1 meters per second; time taken = 10 mins or 10 × 60 seconds = 600 seconds. Distance covered = 1 m/s × 600 s = 600 m
Therefore, the distance covered when speedwalking for 10 minutes based on the 8 meters trial (assuming a speed of 1 m/s) is 600 meters.
is an alpha a product or reactant when released from an isotope
Answer:
Alpha decay
Explanation:
That's the definition of alpha decay
Alpha decay would be an alpha product when released from an isotope. A further explanation is below.
A nuclear decay methodology wherein an atomic nucleus loses energy keeps changing to a particular character by ejecting a substance made up of atomic nuclei, is considered as Alpha decay.Such expelled particle is characterized as something of an alpha decay as well as being essentially a helium nucleus. Alpha quarks have such a surprisingly large weight as well as a positive (+) electrode.Thus the above alternative is right.
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Read the passage from Hamlet, Act III, Scene iv.
Gertrude: What wilt thou do? thou wilt not murder me?
Help, help, h!
Polonius: [Behind.] What, h! help! help! help!
Hamlet: [Draws.] How now! a rat? Dead, for a ducat, dead! [Makes a pass through the arras.]
Polonius: [Behind.] O! I am slain.
Gertrude: O me! what hast thou done?
Hamlet: Nay, I know not: is it the king?
Gertrude: O! what a rash and bloody deed is this!
Which element of tragedy does Shakespeare most develop in this passage?
conflict among characters
suspense in the plot
hero overcoming tragedy
unhappy ending for the main character
Answer:
conflict among characters
Explanation:
Answer:
Conflicting among characters
Explanation:
The distance between the nuclei of two carbon atoms in its elemental form is
(a) 77 pm
(b) 154 pm
(d) 120 pm
(c) 17 pm
Answer:
its B: 154.
Explanation:
the bond lenth between two atoms in a molecule depends not only on the atoms but also on such factors as the orbital hybridzation and the electronic and steric nature of the substituents. the carbon-carbon (C-C) bond length in diamonds is 154 pm.
The distance between the nuclei of two carbon atoms in its elemental form is 154pm.
What is distance?Distance is a numerical measurement of how far the objects or points are. It is the actual length of the path travelled from one point to another.
What is nuclei?Nuclei is a plural form of nucleus. The nucleus is a collection of particles like protons, which are positively charged and neutrons, which are electrically neutral.
The carbon–carbon (C–C) bond length in diamond is 154 pm. It is the average length for a carbon–carbon single bond and it is also the largest bond length that exists for ordinary carbon covalent bonds.
Therefore, the distance between the nuclei of two carbon atoms in its elemental form is 154pm.
Hence, option b is the answer.
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What is a nonpolar bond?
Answer:
Nonpolar covalent bonds are a type of bond that occurs when two atoms share a pair of electrons with each other. These shared electrons glue two or more atoms together to form a molecul
Explanation:
write the symbol of each neutral element based
on its Noble Gas Shorthand configuration:
[Ar]4'30
[Hel2s2p
TYPE
| Xolos
Volatility and vapor pressure are ________. Volatility and vapor pressure are ________. not related directly proportional to one another both independent of temperature the same thing inversely proportional to one another
Answer:
directly proportional to one another
Explanation:
Volatility refers to how quickly a substance changes from liquid to gas.
If a substance has a high vapour pressure, the substance is highly volatile. Similarly, if a substance has a low vapour pressure, then the substance is much less volatile.
This implies that volatility and vapour pressure gives a direct proportionality.
if water were a non-polar
Molecule
Answer:
Water would not be able to transport nutrients -‐-‐ in plants, or in our bodies -‐-‐ nor to dissolve and transport waste products out of our bodies. ... Cohesiveness, adhesiveness, and surface tension: would decrease because without the +/-‐ polarity, water would not form hydrogen bonds between H20 molecules.
explain why pure water is a compound, but water from a fountain is not.
Which element's atoms have a larger covalent
radius than atoms of silicon?
sodium
carbon
sulfur
chlorine
Answer:
Explanation:chlorine
Think about the experiment at the start of this lesson. The steel wool reaction is as follows: 4Fe(s)+3O2(g)→2Fe2O3(s).
How would you measure the amounts of each reactant used and the product that forms?
Answer:
I did this but I dont remember
Explanation:
kk
What’s the mass of a empty glass measuring cup
How many molecules are in 11.75 moles of water (H2O)?
Answer:
7.07585×10^24 molecules
Explanation:
# of Moles X Avogadro's Number= # of Molecules
According to the concept of Avogadro's number, there are 7.075×10²⁴ molecules in 11.75 moles of water.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number. Number of molecules is calculated as:number of moles×Avogadro's number
∴number of molecules= 11.75×6.022×10²³=7.075×10²⁴ molecules.
Thus, there are 7.075×10²⁴ molecules in 11.75 moles of water .
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H2o has how many atoms in it? 1,2, or 3?
Balance the following equation: CO2 (g) + H2O (I) → C12H24012 (s) + O2 (g)
Answer:
12CO₂ + 12H₂O ⇒ C₁₂H₂₄O₁₂ + 12O₂
Explanation:
Make sure to have the same amount of reactants and products on both sides of the equation. Just takes practice
name a non metal having more density. plss help friend,,I Will Mark as BRAINILLIST
Answer:
Iridium and osmium have the highest densities.
which period of the periodic table is completely made up of elements with no known stable ions?
Answer:
I think the answer is period 7
Explanation:
The period in periodic table, in which no stable ions of elements exists is 7th period. They contains actinides.
What are actinides?Actinides are 7th period elements classified to F block of periodic table. A periodic table contains vertical columns called groups and horizontal rows called periods. Each elements are classified into suitable groups based on their similarity in properties with other group elements.
There are four blocks in periodic table which are s, p, d and f block. S block elements are metals and d block contains transition metals and p block have non metals including gases and metalloids.
Actinides are f- block metals. All the elements in the period are radioactive. That's why they don't have a stable isotope or ion. They continuously undergo radioactive decay by the emission of charged particles.
Hence, the period containing unstable elements is 7th one.
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(HELP )Which statement about solids is correct?
Select one:
Answer:
A. Solids can only change shape if forced to make a change
Explanation:
A solid substance is one of the states of matter.
Matter is anything that has weight and occupies a definite space.
There are three states of matter commonly known: solids, liquids and gases.
Solids have a fixed shape and definite volume. Their crystals are well ordered about a fixed point. It is only when a force is applied that their well ordered arrangement is destroyed and they are forced to make a change.which noble gas is closet to magnesium, Mg, on the periodic table
Answer:
neon gas is the closest noble gas to magnesium ( mg ) on the periodic table.
Explanation:
hope this answer will help you
Eggs turn into omelet physical or chemical
Balance the equation below
Fe,
Fe+
02
0 Balance the following equation: CO2 (g) + H2O (1) → C12H24012 (s) + O2 (g) +
Explanation:
Answer: 12CO2(g) +12H2O(l)->C12H24O12(s)+12O2(g)
Once you make balancing equations don't disturb the given numbers because it is fix you need to solve by the side of the chemical name.
1.
Valence electrons are
a) found in the nucleus of the atom
b) found in the first orbital
c) found in the last orbital
d) have a positive charge
i think that the answer is D
A 1.5 M solution of NaOH was made in a laboratory. If the solution made had a volume of 4.5 L, how many grams of NaOH were added?
Answer:
270g
Explanation:
Given parameters:
Concentration of solution = 1.5M
Volume of solution = 4.5L
Unknown:
Mass of NaOH added = ?
Solution:
Concentration is the number of moles of solute found in a solution.
To solve this problem, we need to find the number of moles of NaOH first;
Number of moles = concentration x volume
Number of moles = 1.5 x 4.5 = 6.75moles
Now, to find the mass of NaOH;
Mass of NaOH = number of moles x molar mass
Molar mass of NaOH = 23 + 16 + 1 = 40g
Mass of NaOH = 6.75 x 40 = 270g