Final answer:
Graham's law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its molar mass, a principle formulated by Thomas Graham that helps in understanding gas behavior and has practical applications in gas separation and analysis.
Explanation:
Graham's law of effusion is a fundamental concept in the field of chemistry that describes how the rate at which gas molecules escape through a tiny hole into a vacuum (effusion) or how they spread out (diffusion) is determined by their molar mass. Specifically, the law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its molar mass. This relationship can be mathematically represented for two gases, A and B, as (Rate of A) / (Rate of B) = sqrt(Molar Mass of B / Molar Mass of A), where sqrt denotes the square root.
This law can be understood through the kinetic theory of gases, which posits that gases at equal temperatures have the same average kinetic energy. Therefore, a lighter gas (lower molar mass) will move faster than a heavier gas because the energy distributed among its molecules more readily allows for higher speeds. This concept was developed by Scottish chemist Thomas Graham in the 19th century and has essential applications in separating isotopes and analyzing the composition of gaseous mixtures.
magnesium chloride is an example of an ionic compound, which is a compound composed of what?
what liquid metal has more protons than gold,but fewer electrons than thallium
What are the similarities and differences between heat and thermal energy? Need to know for quiz tomorrow:( PLEASE HELP!!!
Final answer:
Heat is the transfer of thermal energy between objects, while thermal energy is the total kinetic energy of all particles in an object. Heat causes a change in temperature, while thermal energy affects the overall temperature of an object.
Explanation:
Differences between Heat and Thermal Energy:
1. Definition: Heat is the transfer of thermal energy from an object at a higher temperature to an object at a lower temperature. Thermal energy is the total kinetic energy of all the particles in an object.
2. Transfer: Heat can be transferred between objects, while thermal energy remains within an object.
3. Temperature Change: Heat transfer causes a change in temperature, while thermal energy affects the overall temperature of an object.
Similarities between Heat and Thermal Energy:
1. Units: Both heat and thermal energy are measured in Joules.
2. Related: Heat is a form of thermal energy and both are related to the movement of particles.
3. Conservation: Both heat and thermal energy obey the law of conservation of energy.
One standard drink, which contains .6 ounces (14 grams) of alcohol, contains_____ calories but no nutrients.
A. 14
B. 28
C. 56
D. 97
Answer:
D) One standard drink, which contains .6 ounces (14 grams) of alcohol, contains around 97 calories
Explanation:
The amount of calories per gram of alcohol = 7 cal
i.e. Alcohol = 7 cal/g
A standard drink contains 0.6 ounces i,e. 14 grams of alcohol.
Therefore, the calories corresponding to that present in a standard alcoholic beverage would be:
[tex]= \frac{14\ g * 7\ cal}{1\ g} = 98\ cal[/tex]
explain the process that forms a normal fault ad leads to an earthquake along the fault. Describe the fault, the type of stress that produces it, and events during the earthquake
Answer:
the plates move which causes an earthquake.
Explanation:
i learned about this.
Answer:
i have no clue
Explanation:
Which conclusion is best supported by Julie’s observations?
A. The liquid is a pure substance because it is colorless.
B. The liquid is a mixture because its temperature rises.
C. The liquid is a pure substance because it remains liquid when cold.
D. The liquid is a mixture because it has a gas dissolved in a liquid.
You want to investigate how the color of light affects the growth of plants. The best resource for reliable scientific information to help you with your hypothesis would be a(n)
A. book on the species of plants grown in your area
B.magazine article on gardening
C.article documenting experiments with their results
D.website containing information about light sources
Answer: C.article documenting experiments with their results
Explanation:
An independent variable is the variable that can be changed or manipulated so as to determine the result of such change on the dependent or the experimental variable.
In the given study, the color of light is the independent variable the effect of which is to be determined over the plant growth which is the dependent variable.
The information related to this experiment can be observed on the article documenting the experiments similar experiment. This will have valid and reliable information.
Light that bounces off a surface is said to be
A. reflected
B. refracted
C. absorbed
D. radiated
Create your own Model of an Atom. You may choose any element you would like to be represented by your model of an atom. Then photograph your model and put in a PowerPoint slide then submit to the assignment box.
The model must include:
1) All parts of an atom.
2) Each part must be labeled.
3) The parts must be placed in the correct location in the atom.
plzz help fasttt due today
the formula for sodium sulfide is Na2S. explain what this formula means.
When metals and non metals combine in fixed proportion then a chemical compound is formed. The given Formula represents 2 sodium (Na) atoms and one sulfur (S) atom.
What is chemical formula?Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral.
The formula for sodium sulfide Na₂S means 2 sodium (Na) atoms and one sulfur (S) atom are there. 2 sodium (Na) atoms and one sulfur (S) atom combine to form Na₂S.
Therefore, formula represents 2 sodium (Na) atoms and one sulfur (S) atom.
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which two elements in the periodic table have the same number of electrons in their outer orbitals?
Which mineral property can be determined simply by observation
Answer is: luster.
Luster is example of qualitative observations.
Qualitative observations are information about the quality of substances.
In qualitative observation, informations are collected using senses (sight, hearing, taste, smell and touch).
Qualitative observations are not measurable and cannot be recorded in terms of numbers.
Luster is the way light interacts with the surface of a mineral.
Other example is cleavage, the tendency of mineral to split along definite crystallographic structural planes.
In an experiment using a calorimeter, the following data were obtained: what is the total number of joules absorbed by the water?
A.) 1,000
B.) 1,500
C.) 6,300
D.) 4,500
the term Reuther Ford gave to the positively charged particles in the nucleus of an antom was
Baking soda is mixed with water, and no bubbles are produced. When baking soda is mixed with vinegar, it bubbles and foams rapidly.
What chemical property of baking soda is shown in the scenario?
flammability
reactivity
boiling point
color change
Answer:
reactivity
Explanation:
According to the United Nations, how many people lack access to safe drinking water?
Eukaryotic cells contain certain structures that perform specialized functions for the cell. What are these structures called? A. cells B. organs C. tissues D. organelles
The carbohydrates seen here contains 3 common elements.They are....
A) carbon,hydrogen,and oxygen
B) oxygen,nitrogen,and sulfur
C) hydrogen,oxygen,and nitrogen
D)carbon dioxide, hydrogen,and phosphorus
What are chicken nuggets made of
Which of the following elements is very reactive and needs to lose one electron to have a full outermost shell?
Scandium
Cesium
Iodine
Xenon
Answer:
Cesium
It is the most reactive element on the periodic table.
3. Give three examples of how microorganisms might demonstrate the characteristics of life
PLease help me i will give brianlist i am siooo desperte please
Answer:
they grow, reproduce and die.
Explanation:
Microorganisms are a way of life that cannot be visualized without the aid of a microscope. These tiny beings can be found in the air, on the ground, and even in man. These tiny beings are not all the same, they can be very different in size and way of life. However, they all have in common a very simple structure and the impossibility of being seen without the use of a microscope. In addition, microorganisms can represent some characteristics of life, since as well as living beings in gereal they grow, reproduce and die.
what is the name of the compound that has the formula Li2SO3?
a. lithium sulfite
b. lithium sulfate
c. bilithium trisulfate
d. bilithium trisulfide
The name of the compound that has the formula Li₂SO₃ is lithium sulfite, it is an ionic compound, hence option A is correct.
Although lithium sulfate doesn't often increase in solubility with temperature like other salts do, it is soluble in water. Instead, because its dissolution is an exothermic process, its solubility in water declines as temperature rises.
It is simple to hydrolyze and absorb water vapor from the air, which releases gaseous hydrogen sulphide, which is extremely hazardous.
Lithium sulfite easily to dissolve in water, ethanol, acid, and base; difficult to dissolve in alkali.
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what is the relationship between the length of daylight and the sun's angle
The length of daylight is deeply connected to the sun's angle above the horizon, influenced by the Earth's tilt and orbit around the sun. The higher the sun's angle during the summer, the longer the day; conversely, the lower the angle during winter, the shorter the day.
The relationship between the length of daylight and the sun's angle is a consequence of the Earth's tilt and its orbit around the sun. The sun's angle, which refers to the height of the sun above the horizon, changes throughout the year as the Earth orbits the Sun with its axis tilted. This tilt and the Earth's position in its orbit determine the length of day and the intensity of sunlight, which is also known as insolation. During the summer solstice, the sun's angle is at its highest in the northern hemisphere, resulting in the longest day of the year, while during the winter solstice, the sun's angle is at its lowest, leading to the shortest day of the year.
As latitude increases, the length of daylight decreases. For example, at higher latitudes, the number of daylight hours is significantly less during winter months compared to the equator, where day and night are of relatively equal length year-round. This affects the growing season and photosynthesis in plants, which rely on daylight hours. In essence, the lower the sun's angle, the more spread out and less intense the sunlight is, which reduces energy input per unit area.
Which of the following is an example of velocity? Question 15 options: A plane travelling south towards the Bahamas. A man running 7 miles per hour west. A car sitting at a stop sign? A dog running at 5 miles per hour.
Answer is: A man running 7 miles per hour west.
Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.
Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.
Answer: A man running 7 miles per hour west.
Explanation: Vector quantity is a quantity which has both magnitude and direction.
Scalar quantity is a quantity which has only magnitude.
Velocity is a vector quantity which expresses the speed of the body along with the direction in which it is moving.
[tex]v=\frac{distance}{time}=\frac{miles}{hour}[/tex]
Thus the correct option is A man running 7 miles per hour west.
Homework help :)
Give an example where the following energy changes would take place:
Electric to Thermal
Chemical to Thermal
Electric to Mechanical
1. A toaster draws electric current (electrical energy) from a wall outlet and converts these moving electric charges into heat (thermal energy) in the filaments that turn red hot to cook your toast.
Examples of Chemical Energy to Thermal Energy:2. Coal is burned at a power plant. The chemical energy released as the coal is burned heats water and turns it into steam. The chemical energy causes the liquid water molecules to move faster increasing their thermal energy.
In your own words, what is homeostasis?
Answer:
homeostasis is the stabilizing of an organism's internal condition
In a beaker, sugar is dissolved in water, and then the water is heated and evaporates. The sugar is recovered, and heat is again applied. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred?
A) the boiling point of water
B) the boiling point of sugar
C) the identity of the black substance
D) temperature at which sugar evaporates
The boiling point of sugar is a must to determine if a chemical change has occurred or not. Thus, the correct option is B.
What is Chemical change?A chemical change is the change which occurs when one substance combines with the other substance in solution. For examples while heating the sugar, it reacts with the oxygen gas present in the environment.
If we dissolve sugar in a glass of water, we can evaporate the water to get back to the solid sugar in the vessel. This is a physical change called a phase transition. A phase change involves a change in the state or form of the new substance formed.
Sugar does not boil, but instead will get re-crystallized in the beaker at a much higher temperature of about 320°F. As the temperature keeps on increasing, the water in the beaker will reach its boiling point, and turn into steam in the process of evaporation. Meanwhile, the sugar in the solution will begin to re-crystallize in the bottom of the vessel.
Therefore, the correct option is B.
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What provides clues about how igneous rocks were formed? A color B Texture C Luster D Streaks
A portion of the periodic table is shown above Which element on the periodic table has properties that are most similar to those of nitrogen (N) and which element has properties that are the least similar? Explain your reasoning.
Explanation:
Elements that are present in same group contains same number of valence electrons.
Therefore, they tend to show similar chemical properties.
For example, both nitrogen and phosphorus are group 15 elements. Hence, they have 5 valence electrons and they tend to show similar chemical properties.
Since, C, N, P, O and S are all non-metals but Al is a metal.
Therefore, properties of aluminium will be completely different from that of nitrogen or other non-metals.
Hence, we can conclude that element P has properties that are most similar to those of nitrogen and element Al has properties that are the least similar to nitrogen.
How does the law of conservation of mass apply to this reaction: C2H4+3O2----> 2H2O+2CO2
A.Only the oxygen needs to be balanced
B. The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen and carbon
C.The law of conservation of mass has already been applied
D. Each element needs to be balanced
The answer is; C
There are 2 Carbons, 4 Hydrogens, and 6 oxygens on both sides
All the moles of the elements on the right of the reaction equation are balanced with those on the left of the equation. These moles are indicated by the number in front of the symbols of the elements. This ensures that the first law of thermodynamics is observed. This law states that no matter or energy can be destroyed or created; It can only be transformed.
Option C. The law of conservation of mass has already been applied, is the correct option
The question asks how the law of conservation of mass applies to the chemical reaction C₂H₄ + 3O₂ ---> 2H₂O + 2CO₂.
Law of Conservation of Mass This means that the number of each type of atom in the reactants must be equal to the number of each type of atom in the products.
Balancing the Equation
In the given reaction: C₂H₄ + 3O₂ ---> 2H₂O + 2CO₂, we need to ensure that each element is balanced on both sides of the equation.
Since the number of atoms for each element is the same on both sides of the equation, the law of conservation of mass has been applied, and the equation is balanced.
Therefore, the correct answer is C .The law of conservation of mass has already been applied.