Effusion refers to the movement of a gas through a small hole. It is different from diffusion which involves the movement of a gas from a region of higher concentration to a region of lower concentration.
The effusion of a gas is described by Graham's law. According to Graham's law, the rate of effusion of a gas is inversely proportional to the square root of the molar mass of the gas.
The following are true regarding the effusion of a gas;
At the same temperature, lighter molecules move at a higher velocity than heavier ones.Effusion involves the movement of gas molecules through a small hole in a container.Learn more: https://brainly.com/question/8804761
Which statement correctly describes a characteristic that a scientific
measuring tool should have?
A. To be precise, it must be able to make measurements repeatedly
over a long period of time.
B. To be precise, it must be able to make measurements with small
units.
C. To be precise, it must be able to make measurements that are
close to the actual value.
D. To be precise, it must be able to make measurements with both
large and small units.
Answer:
A. To be precise, it must be able to make measurements repeatedly over a long period of time.
Explanation:
The precision of a scientific measuring tool can be defined as how close the values between multiple measurements are to each other, when repeated under the same conditions.
This ultimately implies that, the precision of a scientific measuring tool reflects the reproducibility and repeatability of its measurements, irrespective of how accurate the measurements are.
In science, one of the most effective ways to determine the precision of a scientific measuring tool is to find the difference between the highest and lowest measurements (measured values).
Hence, the statement which correctly describes a characteristic that a scientific measuring tool should have is that, to be precise, it must be able to make measurements repeatedly over a long period of time.
(ii) Describe briefly one chemical test to distinguish dilute
HCI from dilute HNO3
Answer:
By adding, a few drops of AgNO3
Dilute HCl reacts with silver nitrate to give a white precipitate of silver chloride.
On the other hand there is no reaction observed when dilute Nitric acid is treated with silver nitrate solution. That is obvious
Reactions :-
HCl(aq) + AgNO3(aq) >>> AgCl(s) + HNO3(aq)
HNO3(aq) + AgNO3(aq) >>> No reaction + No precipitate
The variables for this experiment include the height of the track and the speed of the car. Use the drop-down menus to complete the sentences and identify the independent and dependent variables. The independent variable, or the one that is intentionally manipulated, is . The dependent variable, or the one the response is measured in, is
Answer:
initial height, speed
Explanation:
Answer:
The variables for this experiment include the height of the track and the speed of the car. Use the drop-down menus to complete the sentences and identify the independent and dependent variables.
The independent variable, or the one that is intentionally manipulated, is
✔ initial height
The dependent variable, or the one the response is measured in, is
✔ speed
Explanation:
These were correct on edge.
Hope this helped!
How many orbitals are in the first energy level?
O A. 3
O B. 1
O c. 2
O D. 4
How many atoms of oxygen (O) are represented in the chemical formula shown below?
2 CO2
1 atom of oxygen
2 atoms of oxygen
6 atoms of oxygen
4 atoms of oxygen
Write the term that is suggested by each figure or description
pls help me with this question pls
Answer:
Answers are below:
Explanation:
There are 18 groups and 7 periods in the modern periodic table. The atomic size and metallic character of elements increase down a group. Also, the atomic size and metallic character of elements decrease from left to right in a period.
Have a good night!
(a) Which of these pieces of apparatus is most suitable to measure 70cm^{3} of the solution?
(b) (i) Complete the empty boxes to name the pieces of apparatus below.
(ii) Which method of separation, A, B or C, would be most suitable to obtain pure water from the solution?
(c) Describe how crystals of salt could be quickly obtained from the solution.
Answer:
C
Explanation:
How does the concentration (amount) of carbon dioxide in the affect climate?
A. As carbon dioxide concentrations increase, temperatures decrease.
B. As carbon dioxide concentrations increase, temperatures increase.
C. Carbon dioxide concentrations have no affect on climate.
D. As carbon dioxide concentrations increase, temperatures become more random.
Answer:
A
Explanation:
When the carbon dioxide concentration goes down, temperature goes down. A small part of the correspondence is due to the relationship between temperature and the solubility of carbon dioxide in the surface ocean, but the majority of the correspondence is consistent with a feedback between carbon dioxide and climate.
The image above shows a gas held in a chamber with a fixed volume. The gas begins with a temperature 333 K and a pressure of 4.00 atm (green) that increases to 7.65 atm (orange) as the gas is heated. What is the temperature of the gas when the pressure increases to 7.65 atm?
Answer:
636.86 K
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T1) = 333 K
Initial pressure (P1) = 4 atm
Final pressure (P2) = 7.65 atm
Final temperature (T2) =?
NOTE: The volume is constant.
Since the volume is constant, we can obtain the new temperature the gas by using the following formula as illustrated below:
P1 /T1 = P2 /T2
4/333 = 7.65/T2
Cross multiply
4 × T2 = 333 × 7.65
4 × T2 = 2547.45
Divide both side by 4
T2 = 2547.45 / 4
T2 = 636.86 K
Therefore, the new temperature of the gas is 636.86 K
Answer:
It's 637 <3
Explanation:
Round 636.86 to get 637, proven on CK12
the question is on the pic, thanks :)
Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?
Answer: The bones block the x-ray particles to pass through it, and a study of the bones is possible using this technology.
Explanation:
Imagine That you're living in Miami Florida And your family have decided That it's time to move it to the new home. Which of the following Situations would Be Example of External migration? A- Move to Tampa bay Florida B- Move a few streets away C- Move to Atlanta Georgia D- Moved to Mexico
Answer:
Mexico
Explanation:
external migration means move to a different country
Which feature is created on the exterior of a volcano when it erupts?
Answer:
When the magma reaches it boiling point and it starts to rise
Explanation:
Which of the following statements accurately describes the structure of the atom?
Select one:
a. The protons are located in the nucleus and the electrons and neutrons are located outside the nucleus.
b. The protons and neutrons are located in the nucleus and the electrons are located outside the nucleus.
c. The electrons are located in the nucleus and the protons and neutrons are located outside the nucleus.
d. Protons, neutrons, and electrons are all located in the nucleus.
Given a force of 88 N and an acceleration of 4 m/s2, what is the mass? *
A fish swims 0.8 m/s for 34 m. How much time does it take the fish to swim this distance?
Do not round.
NO UNITS NEEDED.
Answer:
42.4m
Explanation:
Given parameters:
Speed of the fish = 0.8m/s
Distance = 34m
Unknown:
Time taken for the fish to swim = ?
Solution:
Speed is the distance divided by the time taken;
Speed = [tex]\frac{distance}{time}[/tex]
Time = [tex]\frac{distance}{speed}[/tex]
Now, insert the parameters and solve;
Time = [tex]\frac{34}{0.8}[/tex] = 42.4s
what is the correct name for Ga(NO2)3?
Gallium Nitrite your welcome
A binary III/V direct bandgap semiconductor called gallium nitride is ideally suited for high-power transistors that can function at high temperatures. It has been widely utilized in light-emitting diodes (LED) since the 1990s. Its chemical formula is Ga(NO₂)₃.
Blu-ray discs are read using a blue light that gallium nitride emits. Gallium nitride is also utilized in lasers, photonics, RF components, and semiconductor power devices. GaN will be used in sensor technology in the future.
Gallium nitride power amplifiers are perfect for microwave and terahertz (ThZ) devices, such as imaging and sensing, the aforementioned future market, due to their capacity to operate at significantly higher temperatures and voltages than gallium arsenide (GaAs) transistors.
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Fossil fuels were formed when living things (plants and animals) died and their remains were broken down. This is an example of _______.
A. Combustion
B. Decomposition
C. Photosynthesis
D. Cellular Respiration
what are examples of chemicals that need to be diluted? i need 4 examples please 20 points!
Answer:
Travelling hygiene
Drink only bottled water.
Don't use tap water to clean your teeth.
When you wash your hands, make sure they are totally dry before you touch any food.
Don't wash fruit or vegetables in unsafe water.
URGENT!...
Hey guys i need help with this question please
Why are there more earthquakes in California than Tennessee?
A. There is more plate movement in Tennessee.
B. California is breaking off to fall into the ocean.
C. There is more plate movement in California.
Answer: C. There is more plate movement in California.
Explanation:
How is a conductor different from an insulator?
A. The free movement of electrons within a conductor permits the transfer of charge.
B. The free movement of protons within a conductor permits the transfer of charge.
C. There is no free movement of electrons within a conductor.
D. There is no free movement of protons within a conductor.
Answer:
A
Explanation:
Conductors allow for charge transfer through the free movement of electrons. In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule. ... The insulator serves as a handle for moving the conductor around on top of a lab table
Answer:
1. Electrons surrounding a nucleus are attracted to the protons within it because electrons and protons have opposite charges. Electrons closest to the nucleus are attracted with such a force that they can’t escape from the atom. These electrons tend to shield the protons from electrons that are farther away because electrons have the same charge and repel each other. Electrons that are farther away have less attraction to the protons within the nucleus and are more likely to be detached from the atom.
2. Electrons can be transferred from atoms of one body to atoms of another body through friction. This can occur when one body is rubbed against another or when a liquid flows across a solid. In either case, one body may be given a positive charge while the other body is given a negative charge of the same magnitude. Both charges are developed at the same time. Electrons can also be transferred from one body to another when a charged body comes into contact with an uncharged body. The electrons move in the direction that will equalize the charges; thus, the uncharged body will be given the same charge as the charged body.
3. Free electrons move from points of negative charge to points of positive charge. When these electrons move freely from one point to another with little resistance, the material they’re traveling through is said to be a conductor. Conductors have a large number of free electrons. Insulators, on the other hand, have very few free electrons and offer great resistance to the movement of these electrons. Electric charges produced on one end of a body composed of insulating materials will most likely not spread throughout the body. In a conductor, this charge would spread throughout the entire body. Metals are generally conductors; oils, rubber, air, porcelain, and plastics are good insulators.
4. Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:
One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.
A positively charged cloud comes near a negatively charged cloud.
A cloud with either a positive charge or a negative charge comes near the earth.
how do we grow flowers in vase and plastic bags?
Answer:
put soil in the plastic bag.. put seeds. and add water
Explanation:
this is the right answer
Students are to imagine that they are leading a one-week expedition to the Moon’s South Pole. In the essay, students will need to describe to NASA what (and who) they would bring to help make their expedition a success.
Answer:
On Sept. 15, 2020, NASA, in partnership with Future Engineers, launched the Artemis Moon Pod Essay Contest. The contest, which is open to all (public, private, and home school) students in grades K-12, asks participants to imagine they are leading a one-week expedition to the Moon’s South Pole. In the essay, students will need to describe to NASA what (and who) they would bring to help make their expedition a success.
The Moon Pod Essay Contest is presented in support of NASA’s Artemis program. The student challenge is part of NASA’s efforts to engage the public in its missions to the Moon and Mars. NASA is returning to the Moon for scientific discovery, economic benefits, and inspiration for a new generation. Working with its partners throughout the Artemis program, the agency will fine-tune precision landing technologies and develop new mobility capabilities that allow robots and crew to travel greater distances and explore new regions of the Moon.
Explanation:
Answer:
I would bring some warm clothes to keep me warm through the night because South Pole is cold. I would also bring blankets and sticks to make a fire. I would bring my bestfriend to keep me company.
Explanation:
Which elements make up the pain reliever acetaminophen, chemical formula C8H9O2N? Of these elements, which is present in the greatest proportion by number of atoms?
a
Calcium, helium, ozone, and neon, with calcium present in the greatest proportion
b
Carbon, hydrogen, oxygen, and nitrogen, with carbon present in the greatest proportion
c
Calcium, hydrogen, oxygen, and neon, with hydrogen present in the greatest proportion
d
Carbon, hydrogen, oxygen, and nitrogen, with hydrogen present in the greatest proportion
Answer:
Carbon, hydrogen, oxygen, and nitrogen, with hydrogen present in the greatest proportion
Explanation:
Let's consider the chemical formula of acetaminophen: C₈H₉O₂N. According to this formula, in 1 molecule of acetaminophen there are:
8 atoms of carbon (C)9 atoms of hydrogen (H)2 atoms of oxygen (O)1 atom of nitrogen (N)As we can see, the element present in the greatest proportion by number of atoms is hydrogen.
What are the defects of Mendeleev's periodic table?
Stote the moderneriodiel
Answer:
8 metal are there in modern periodic table
Why is a cell membrane like a security guard because.......
Why?????
The cell membrane allows certain items into a cell and blocks others from entering, just like a security guard protects a real factory.
Three gases found in Earth's atmosphere are carbon dioxide, nitrogen and oxygen. What is their order of abundance from greatest to least?
A. nitrogen, oxygen, carbon dioxide
B. nitrogen, carbon dioxide, oxygen
C. oxygen, nitrogen, carbon dioxide
D. carbon dioxide, oxygen, nitrogen
The order of abundance from greatest to least in gases found in Earth's
atmosphere is nitrogen, oxygen, carbon dioxide.
There are various gases present in the atmosphere such as nitrogen,
oxygen, carbon dioxide etc. Each of them have their important functions in
ensuring the ecosystem is balance and for survival of the organisms present.
The most abundant element is Nitrogen which accounts for about 78
percent of air. Oxygen is the second most abundant with 21 percent present
in air. Others such as carbon dioxide and inert gases represent the
remaining percentage present in air.
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PbO2 (s) + 4 HCl (aq) → PbCl2 (s) + Cl2 (g) + 2 H2O (l)
This is an oxidation-reduction (redox) reaction:
PbIV + 2 e- → PbII
(reduction)
2 Cl-I - 2 e- → 2 Cl0
(oxidation)
PbO2 is an oxidizing agent, HCl is a reducing agent.
Lead (11) oxide dissolves in both
excess dilute nitric acid and
sodium hydroxide solution -
Which of the following is the
property of lead (11) oxide.
A Basic
B Acidic
C Neutral
D Amphoteric
Answer:
bacic
Explanation:
it is very soluble in water