What is the number of moles of a gas inside a 2.7L airbag at a temperature of 421K and pressure of 6.2atm?
Answer:
.48 moles
Explanation
n=PV/RT
how are enthalpy and entropy related to chemical reactions? (in simple terms)
Answer: Enthalpy is the heat content of a system. The enthalpy change of a reaction is equivalent to the amount of energy lost or gained during the reaction. A reaction is favoured if the enthalpy of the system decreases over the reaction. Entropy refers to the measure of the level of disorder in a thermodynamic system.
Explanation: hi lol
Based on the information in the tables, which salt will produce the greatest change in temperature when dissolved in water at 20 c
Answer:
See Explanation Note ...
Explanation:
Depending on amount added, Anhydrous CaCl₂ when dissolved in water solvent can become hot enough to blister ones skin when touched. On the cold side, Ammonium Nitrate will cool an aqueous solution enough to generate condensate frost on the outside of a glass beaker. I'm sure there are more examples but these two came to mind.
Answer:
KOH
Explanation:
I took the test
What is the freezing point of neon?
248.4 °C
Explanation:
Boiling point: -246 °C
Atomic mass: 20.1797 u
Symbol: Ne
describe one reason why models of atoms we usually see in textbooks or diagrams are not perfectly accurate representation of real life atoms
What is an example of chemical to electrical energy at home? Please help
Explain how the sun position in the sky would change the direction of your shadow if u were to stand in the same place all day
Answer:
The suns position would change from human perspective because of the rotation of the earth around its axis. So your shadow would look differently. Explanation: The sun will move where it is at because the earth moves around the sun.
Explanation:
The size of the shadow changes as the sun changes its position.
Change in shadow due to position of sunThe position of sun in the sky would change the direction of our shadow if we were to stand in the same place all day because the sun moves with the passage of time. The sun rises in the east so at that time our shadow is formed towards the west side and start decreasing when the sun reaches high in the sky.
When the sun reaches at the top of our head, then no shadow is formed and when the sun set occurs the length of the shadow again decreases so we can say that the size of the shadow changes as the sun changes its position.
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Argon gas is heated from 28 °C to 350K. After being heated the volume was 1.2 L. What was the original volume?
Explanation:
thinking it Charles
V1=1.03or 1L
What is meant by the term chemical bond? What subatomic particles(protons, neutrons, electrons) are most important in bonds?
Explanation:
Chemical Bonding refers to the formation of a chemical bond between two or more atoms, molecules, or ions to give rise to a chemical compound.
The subatomic particles that participate are electrons.
C3H5N3O9(s) --> N2(g) + CO2(g) + H2O(g) + O2(g) Solid nitroglycerine explodes when heated, producing several different gases (according to the reaction above). If a government scientist explodes 777 g of nitroglycerine, How many grams of each gas should be produced? How many molecules of each gas will be produced?
Answer:
- 143.6 g of N₂ ; 3.08×10²⁴ molecules of N₂
- 451.4 g of CO₂ ; 6.17×10²⁴ molecules of CO₂
- 153.9 g of H₂O ; 5.14×10²⁴ molecules of H₂O
- 27.3 g of O₂ ; 5.14×10²³ molecules of O₂
Explanation:
This is a reaction of decomposition:
4C₃H₅N₃O₉(s) → 6N₂(g) + 12CO₂(g) + 10H₂O(g) + O₂(g)
4 moles of solid nitroglycerine decompose to 6 moles of nitrogen, 12 moles of carbon dioxide, 10 moles of water vapor and 1 mol of oxygen
We convert mass to moles → 777 g. 1mol/ 227g = 3.42 moles
4 moles of C₃H₅N₃O₉ can decompose to:
6 moles of N₂ ____ 12 moles of CO₂ ___ 10 moles of H₂O ___ 1 mol of O₂
Then, 3.42 moles of C₃H₅N₃O₉ may decompose to:
(3.42 . 6) / 4 = 5.13 moles of N₂
(3.42 . 12) / 4 = 10.26 moles of CO₂
(3.42 . 10) / 4 = 8.55 moles of water vapor
(3.42 . 1) / 4 = 0.855 moles of oxygen
We convert the moles to mass:
5.13 mol . 28 g/mol = 143.6 g of N₂
10.26 mol . 44 g/mol = 451.4 g of CO₂
8.55 mol . 18 g/mol = 153.9 g of H₂O
0.855 mol . 28 g/mol = 27.3 g of O₂
We count the atoms:
5.13 mol . 6.02×10²³ molecules /mol = 3.08×10²⁴ molecules of N₂
10.26 mol . 6.02×10²³ molecules /mol = 6.17×10²⁴ molecules of CO₂
8.55 mol . 6.02×10²³ molecules /mol = 5.14×10²⁴ molecules of H₂O
0.855 mol . 6.02×10²³ molecules /mol = 5.14×10²³ molecules of O₂
Un niño de 9 años se encuentra balanceándose en un columpio, si el columpio se encuentra en equilibrio y la cadena que soporta la canastilla donde se sienta el niño tiene un peso de 15Kg y este se encuentra a 42°con respecto a la perpendicular. Determine la tensión de la cadena y la fuerza con la que es empujado si el niño pesa 35Kg.
Answer:
Part A
La tensión en la cadena es de aproximadamente 364,14 Newtons
Part B
La fuerza con la que se empuja el columpio es de aproximadamente 327,874 Newtons
Explanation:
Parte A
Los parámetros dados son;
La masa del asiento en el que se sienta el niño = 15 kg
La inclinación de la cadena de la vertical, θ = 42 °
La masa del niño = 35 kg
La aceleración debida a la gravedad, g = 9,8 m / s²
La tensión en la cuerda, 'T', se da de la siguiente manera;
T = m · g · cos (θ)
Dónde;
m = m₁ + m₂ = 15 kg + 35 kg = 50 kg
g = La aceleración debida a la gravedad = 9,8 m / s²
θ = 42 °
Por lo tanto;
T = 50 kg × 9,8 m / s² × cos (42 °) ≈ 364,14 N
La tensión en la cadena, T ≈ 364.14 N
Parte B
La fuerza con la que se empuja el columpio, 'F', se da de la siguiente manera;
F = m · g · sin (θ)
Por lo tanto;
F ≈ 50 kg × 9,8 m / s² × sen (42 °) ≈ 327,874 N
La fuerza con la que se empuja el columpio, F ≈ 327,874 N.
(7.6 x 104m) x (1.5 x 107m)
Answer:
the answer should 126 859.2 m2
The mass of an atom is equal to the number of
Neutrons, only
Protons, only
Neutrons plus protons
Electrons plus protons
Explanation:
proton number and neutron number sums up to form the mass number
Answer:
Neutrons & protons
Explanation:
hope it's help..
how to get over a guy u have liked for a year and 4 months
Answer:
Try to find someone who is interested in you as well as you are with him. But be chill about it and never ever let yourself think your not perfect enough cause you are thee most phenomenal person in the entire planet and there is no one like you, you are special. P.S. there are alot of cute guys out there you just gotta wait until he finds you or you find him.
Explanation:
Answer:
huh
Explanation:
During a lab activity, students were given samples of four different unknown elements. The students record their observations as shown in the table.
Sample 1 Sample 2 Sample 3 Sample 4
shiny shiny reddish-brown colorless
high electrical
conductivity
low electrical
conductivity
low electrical
conductivity
low electrical
conductivity
solid at room temp. solid at room temp liquid at room temp. gas at room temp.
flattens when hit
with a hammer
breaks into pieces when hit with a hammer
splashes when hit
with a hammer
no effect when hit
with a hammer
boiling point:
882.9 °C
boiling point:
3265 °C
boiling point:
58.8 °C
boiling point:
-268.9 °C
Which of the following BEST identifies which element(s) in the table are metallic?
A.
Sample 1, because it is shiny and a good conductor of electricity
B.
Samples 1 and 2, because both samples are shiny and solid at room temperature
C.
Sample 2, because it is shiny and solid at room temperature
D.
Sample 3, because it is the only sample that is a liquid at room temperature
Answer: D
Explanation: Metals are solid at room temp and also are shiny and can be flattened or broken into pieces when hammered and some metals are high and low conductors of electricity.
Metals have a characteristic property of conduction and malleability and thus sample 1 is metallic.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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Suppose a particle has 4 protons, 5 neutrons, and 2 electrons. What is its
charge?
Answer:
It's going to be a postive charge because although theres a lot more neutrons then the rest of them, neutrons are neutral, which won't have much of an effect to the charge of the atom. 4 protons has a larger proportion to the rest.
List two functions organ systems can perform
Answer:
nervous system- sends signals to the brain
respiratory system- sends oxygen to the body
14. Energy (heat) is always transferred from ___ energy to ___ energy
A. low kinetic; high kinetic
B. high kinetic; high kinetic
C. high kinetic; low kinetic
D. low kinetic; low kinetic
Answer:i pretty sure it is high to low kinetic
Explanation: because heat or energy travels from hot heat to low heat which heat is the same as kinetic
HELP DUE IN ONE HOUR PLS HELP
lons are formed when _____
are transferred between atoms.
3. Sexual reproduction is the process of creating a new organism by combining the
genetic information and material from parent organisms. Which of the following is
responsible for storing the genetic instructions needed to specify traits?
PLEASE HELPP
Answer:
chromosomes is responsible
The reproduction is defined as a process which involves the production of offspring. The genetic instructions are stored in chromosome. The correct option is C.
What is chromosome?A chromosome is defined as the DNA molecule which consists of all the genetic material of an organism. It is found to be present in the nucleus of each cell. The DNA inside the chromosome is tightly coiled around special proteins called histones.
All living organisms are composed of chromosomes. Humans have 23 pairs of chromosomes. 22 pairs of these chromosomes are called autosomes. These are same in both males and females. The 23rd pair of chromosomes are called allosomes and they differ between sexes.
The males have one 'X' and 'Y' chromosome, while females have two copies of the 'X' chromosome. The important function of genetic material is to store information needed by the cell to make proteins.
Thus the correct option is C.
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HELP
Identify two macroscopic characteristics of water that are a result of its molecular structure. Describe how each characteristic is related to the molecular structure of water.
Answer:
1. Water has a high boiling point considering its low molecular weight.
This is because the O-H bonds are very polar and the H's are located at two corners of a tetrahedron giving water a high molecular polarity so that they tend to stick together.
2. Water forms hydrogen bonds between molecules
these bonds are rather flexible so that in liquid phase the molecules are relatively close together
but as the hexagonal arrangement of ice is formed the bonds are licked in place and as a result the average distance between molecules actually increases
with the result that ice is less dense than liquid water
Explanation:
How many grams are in 1.26 moles of HCI?
The answer is 0.027426610504282. We assume you are converting between moles HCl and gram. You can view more details on each measurement unit: molecular weight of HCl or grams This compound is also known as Hydrochloric Acid. The SI base unit for amount of substance is the mole.
i hope this one helps, hehe.
is a group of deer in a field called a community or a population?
Answer:
hi
Explanation:
Answer:
From the 2, I believe it is called a community.
How many moles are in 25 grams of nitrogen trihydride?
Explanation:
molecules NH3 = 1.47 moles x 6.02x1023 molecules/mole = 8.9x1023 molecules of NH3 (to 2 sig. figs.)
hi, put the following bonds in order from shortest to longest: single, double, triple. which is the strongest and which is the weakest? explain...please :)
strongest bond is the triple bond
The weakest is the single bond
Explanation:
What is the charge of electrons?
Answer:
-1
Explanation:
HELP ASAP
What was the result of the atomic theory?
A. Alchemy was transformed into a true science.
B. The atom was discovered.
C. Scientists realized there were four main elements.
D. Chemists began to better understand the properties of matter.
The result of the atomic theory was that chemists began to better understand the properties of matter. Therefore, option (D) is correct.
The atomic theory, proposed by John Dalton in the early 19th century, postulated that matter is composed of indivisible particles called atoms. This theory revolutionized the field of chemistry by providing a framework to understand the behavior and interactions of different substances.
By recognizing that matter is composed of discrete atoms with specific properties, chemists were able to explain phenomena such as chemical reactions, the conservation of mass, and the formation of compounds. The atomic theory laid the foundation for modern chemistry, leading to advancements in understanding the structure of atoms, the development of the periodic table, and the ability to manipulate and engineer materials at the atomic level.
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cells are____structures that constantly______to forem new cells
Answer:
Explanation:
living
divide
Use the information and table to answer the following question.
A group of students collects data to determine whether compounds were ionic or covalent. They placed each
compound in a small bowl and stuck two open ends of a battery-powered circuit in the compound.
Compound
CO2 (s)
KCI (s)
CaO (s)
SIO2 (s)
Conductive
No
No
No
No
Based on the student's data, can they determine which substances are ionic, and which are
covalent?
A. No, as lonic compounds are only conductive in an aqueous (water) solution.
B. Yes, as all of these compounds are lonic since they are not conductive.
C. No, as covalent compounds are only conductive in an aqueous (water) solution.
C
D. Yes, as all of these compounds are covalent since they are not conductive.
Answer:
d
Explanation
all are compounds
Yes, as all of these compounds are covalent since they are not conductive. Therefore, the correct option is option D.
What is chemical compound?A chemical compound is a material made of several similar molecules (as well as molecular entities) joined by chemical bonds and comprising atoms from various chemical elements.
Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be shattered or new ones created during this process. Yes, as all of these compounds are covalent since they are not conductive.
Therefore, the correct option is option D.
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are absolute temperature and kelvin temperature scale the same thing
Answer:
No they are not the same..
Explanation:
Absolute temperature is the temperature of an object on a scale where 0 is in the lowest possible energy state while the kelvin is a base unit of temperature.