Answer:
12
Explanation:
i feel like its 12 because moles are medium sized but are they adult moles or baby moles or growing moles
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.803moles of nitrogen gas are there in a 18 L tank of nitrogen gas at STP.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of any ideal gas =given volume ÷Volume occupied by one mole of a ideal gas at STP
Volume occupied by one mole of a ideal gas at STP=22.4L
given volume of nitrogen gas= 18 L
substituting all the given values in the above equation we get,
number of moles of nitrogen gas =18 L ÷22.4L
number of moles of nitrogen gas =0.803moles
Therefore, 0.803moles of nitrogen gas are there in a 18 L tank of nitrogen gas at STP.
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Explain why the properties of metals, ceramics, semiconductors, polymers, and composites need to be considered before decisions are made about which types of materials are used in a product. Enter your answer in the space provided.
Answer:
See explanation
Explanation:
In different products, different properties are desired based on the intended use of the final product.
The properties of the final product depends highly on the properties of the materials from which it was made.
For instance, when we desire a light weight product which is corrosion resistant and maintains a high tensile strength, we may consider the use of composite materials since they exhibit such properties.
Hence, the producer must consider the properties of each particular material before it is used in a product.
Are electrons always shared equally in a covalent bond? Give two examples.
Answer:
covalent bonds form between two nonmetals, resulting in a sharing of electrons-in order to reach their eight valence electrons (octet rule ) however the atoms rarely share the electrons equally. In polar covalent bonds, the electrons are shared unequally.
ex. HCl
and H2O
True or false: When adding acid to base the phenolphthalein indicator changes colour from colourless to pink at the end of the titration.
Answer: false
Explanation: I don’t know why but I just had this question and gussed false and I was right so false is therefore the right answer. Your welcome.
Which statement describes how echolocation and ultrasound imaging are the same? They both use the absorption of sound waves. They both use the diffraction of sound waves. They both use the reflection of sound waves. They both use the transmission of sound waves.
Answer:
C.) They both use the reflection of sound waves.
Explanation:
Right on Edge
Answer:
C.) They both use the reflection of sound waves.
Explanation:
stay safe 2021
Can someone please help me with the right answer? I only have one more attempt :(
In a molecule of N204 how many different types of atoms are there ?
Answer:
Symbol # Atoms
Nitrogen N 2
Oxygen O 5
Describe the motion of the water molecules as the vapor pressure increases?
Answer: As for vapor pressure being higher at higher temperatures, when the temperature of a liquid is raised, the added energy in the liquid gives the molecules more energy and they have greater ability to escape the liquid phase and go into the gaseous phase.
Explanation:
The motion of the water molecules as the vapor pressure increases is:
The water molecules have greater energyAccording to the movement of the water molecules in a pressurized environment where the vapor and the temperature are increased, there is an increased ability to change from liquid to gas.
As a result of this, the water molecules has greater energy as they are subjected to increased levels of temperature and vapor pressure which makes them have more energy and to be more unstable.
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what’s the process of natural selection
Answer:
Natural selection is the process through which populations of living organisms adapt and change. ... Through this process of natural selection, favorable traits are transmitted through generations. Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species .
Explanation:
i just looked it up lol .
the equation demonstrates a reaction of sodium chloride and fluorine. 2NaCl+F2=2NaF+Cl2. in order for the reaction to proceed, for every two moles of sodium chloride, there must be at least how many mole(s) for fluorine
Answer: You would need 1 mole of Fluorine
Explanation:The equation is already balanced so just looking at the coefficients in the equation we can see that Sodium Chloride (2NaCl) needs two moles for this equation and fluorine (F2) only needs one.
In order for the reaction to proceed, for every two moles of sodium chloride, there must be at least 1 mole for fluorine.
Balanced chemical reaction:2NaCl + F₂ → 2NaF + Cl₂
The reaction given above is balanced. When 2 moles of sodium chloride reacts with 1 mole of fluorine produces 2 moles of sodium fluoride and 1 molecule of chlorine.
Thus, two moles of sodium chloride, there must be at least 1 mole for fluorine.
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WILL GIVE BRAINLIEST
Answer:
b
Explanation:
Which is an example of a double
replacement reaction?
2Na+ Cl2 + 2NaCl
H2SO3 → H20 + S02
2K + 2H20 – 2KOH + H2
NaCl + AgF-NaF + AgCI
Which element is in group 15 period 6? Periodic table 
Answer:
Bismuth ( Bi )
Explanation:
HELP!!!!
please omg
Answer:
I believe it's A. to reduce air bubbles. Tbh, it's been a while
A student investigates the speed of a ball rolling down a ramp. The student records their data in the table below. Which of these best explains the student’s data?
A. The speed of the ball increases as the ball rolls down the ramp because the force acting on the ball is greater than the force of gravity.
B. The speed of the ball increases as the ball rolls down the ramp because the forces acting on the ball are unbalanced.
C. The speed of the ball decreases as the ball rolls down the ramp because the forces acting on the ball are balanced.
D. The speed of the ball decreases as the ball rolls down the ramp because of friction between the ball and the ramp.
Answer:
b
Explanationbecause i took the test and got a 100
A lab requires 20.5g of KNO₃. How many moles of KNO₃ are being used in the lab. Your answer should include a correct numerical set up. What is the approximate percent by mass of the water in the hydrated salt? [Show all work.] *
Answer:
the answer is 0.2
Explanation:
we have a formula that mole= reacting mass/ molar Mass and the molar Mass of KNO3 is 101 so since mole is reacting mass/ molar Mass and our reacting mass is 20.5 then divided it by 101 it is equal to 0.2
What is the pH of an aqueous solution that has an H+ ion concentration of 0.10 M?
14
10
6
1
Answer:
1
Explanation:
pH = -log[H+] = -log(0.10) = log(1.0 x 10^-1) = 1
The pH scale determines how acidic or basic water is. The pH of an aqueous solution that has an H+ ion concentration of 0.10 M is 1. Therefore, option D is correct.
What is pH ?The pH scale, which previously stood for "potential of hydrogen," is used to describe how acidic or basic an aqueous solution is. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
A solution's pH is a significant indicator of its chemical composition. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
pH = -log [ H ⁺ ] = -log ( 0.10 )
= log ( 1.0 x 10⁻¹ )
= 1
Thus, The pH of an aqueous solution that has an H+ ion concentration of 0.10 M is 1. Therefore, option D is correct.
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In which type of atom would radioactive decay most likely occur?
Group of answer choices
Radioactive decay will most likely occur in an atom with 26 protons.
Radioactive decay will most likely occur in atoms that have gained or lost electrons to form charged ions.
Radioactive decay will most likely occur in an atom that has more protons than electrons.
Radioactive decay will most likely occur in an atom with an unstable number of protons and neutrons in its nucleus.
Answer:
4
Explanation:
How to find the final product of Fe (II) + CI ?
The valency of iron (Fe) in this equation is 2
While, the valency of chlorine is 1
Therefore, we know that iron wants to give away 2 electrons to attain octet configuration, and chlorine wants to get an electron to attain octet configuration.
Also while find the products the number of atoms is similar to the oppostie valency
Fe = 1 atom , Cl = 2 atoms
Which will form FeCl₂
Happy to help :)
If you need any help pls ask
Read the article and answer the 6 questions in it.
Answer:
Yea.....where is the article and the 6 questions?
Answer:
Answering
Explanation:
do u want us to tell u what we got?
Ohio Achievement Test Coach Science, Grade 5
10. Bob first blows whistle hard. Then he blows the same whistle gently. What
changed when Bob blew the whistle the second time?
POSTTEST
A pitch
B. volume
C. pitch and volume
D. frequency
The greater the difference in EN (electronegativity) between the intramolecular bonding of two atoms, the bond will experience more ionic behavior. A. True b. False
Mg + Cu2+ —> Mg2+ + Cu
a) why is this a redox reaction?
b) identify the oxidizing agent. Give reason for your answer
answer any of them you want please
Explanation:
Since the oxidation state of Mg is changed to +2 from 0, it is oxidized. (as it is increased)
Similarly, oxidation state of Cu is changed to 0 from +2, it is reduced. (as it is decreased)
Since oxidation & reduction occur at the same time, it is redox reaction.
As Mg is being oxidized, other one must be the oxidizing agent.
Cu is the oxidizing agent
Hydrolysis of fructose..
Answer:
Fructose, as glucose, reacts in high-temperature and supercritical water to several products. For the hydrolysis of fructose to 5-(hydroxymethyl)-furfural (HMF), Antal and coworkers [6,24] found a sequence of reactions commencing with the fructofuranose ring and retaining it intact.
Explanation:
What gases are exchanged during respiration?
Answer:
Explanation:
there should be more showing than telling
Answer:
oxygen and carbon dioxide.
Explanation:
Mark brainly if answered correctly
ROW - ( 3 ) is correct
SYSTEM (A)
Respiratory system - here gaseous exchange takes place.
SYSTEM (B)
Digestive system - here nutrients from food is absorbed and assimilated .
SYSTEM (C)
Excretory system - removal of waste occurs
Which of the following would not produce a sound?
some pls help me
Answer:
D
Explanation:
sound waves can not be carried in space
Answer:D
Because space us silent
Is Palladium an elementary substance or a compound?
Answer:
Elementary substance, since it is in the periodic table of elements.
Hope that helps!
-SCSB
Explanation:
¿Qué energías son usadas en la fabricación de las llantas desde la obtención de materia prima caucho natural, hasta el producto terminado ?
Answer:
yo te diria que el elastico amigo es esa
Calculate the relative formula mass (Mr) of gold chloride (AuCl3).
Relative atomic masses (Ar): Cl = 35.5 Au = 197
Answer:
197 + (35.5×3) = 303.5
Explanation:
relative formula mass is the sum of the relative atomic masses of the atoms in the formula ( AuCl3 )
Name three uses for mercury.
USES OF MERCURY
used in thermometer as it is liquid at room temperature.It is used in batteries , florescent lightit is also used in dental filling