Where are the most reactive nonmetal elements found on the periodic table?
at the top of group 17
at the bottom of group 17
at the top of group 18
at the bottom of group 18
Answer: Option (a) is the correct answer.
Explanation:
Elements of group 17 are fluorine, chlorine, bromine, iodine and astatine. And, it is known that size of elements increases on moving down the group due to increase in number of electrons.
Since, atomic number of fluorine is 9 and its electronic distribution is 2, 7. So, it needs just one more electron to stabilize itself and fluorine has the smallest size as compared to rest of the atoms of its group so, it has the ability to attract an electron more strongly towards itself.
Also, due to small size nucleus of fluorine is able to pull electrons strongly towards itself. As a result, there will be increase in its reactivity.
Thus, we can conclude that the most reactive non-metal elements are found on the periodic table at the top of group 17.
How can the difference in the brightness of spectral lines be explained?
What is the linear velocity in miles per hour of the tip of a lawnmower blade spinning at 2600 revolutions per minute in a lawnmower that cuts a path that is 24 inches wide?
The linear velocity of the tip of a lawnmower blade is equal to 0.0515 miles per hour.
What is angular velocity?Angular velocity can be described as the rate of change of angular displacement of an object and the axis about which the object is rotating. The amount of change in angular displacement at a given period of time is known as angular velocity.
Given, a lawnmower blade spinning at 2600 revolutions per minute in a lawnmower that cuts a path that is 24 inches wide.
The frequency of the blade is f = 2600 rpm
First of all convert minutes into hours,
The frequency of the blade becomes = 2600/60 = 43.3 revolutions per hour.
The angular velocity of the blade, ω = 2πf
ω = 2 ×3.14 × 43.3
ω = 272.13 rad/hr
The diameter of the circle centered at the midpoint of the blade is the width of the path.
Diameter of the circle = 24 inches
Radius of the circle, R = 24/2 =12 inches
Let's convert inches into miles:
12 inch = 12 × 1.578 e⁻⁵ mile
R = 12 inch = 0.0001893 mile
The linear velocity of the tip of a blade, v = ωR
v = 272.13 × 0.0001893
v = 0.0515 mile per hour
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When comparing equal volumes of a stronger and weaker acid, what would be observed?
A) the strong acid would taste sour; the weaker acid would taste sweeter.
B) the electrical conductivities would be different
C) the effects on blue litmus paper would be different.
D) they would produce the same amount of hydrogen gas in the same amount of time when reacting with zinc
B) The electrical conductivities would be different.
The conductivities would be different because strong acids produce more electrolytes than weak acids.
When comparing equal volumes of a stronger and weaker acid, the electrical conductivities of the two acids would be different as the strong acid will dissociate completely while weak acid will dissociate partially.
What is an acid?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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How might an ecologist Measure population density of pine trees in an actual forest?
At what time of year is the intensity of solar radiation striking each of earth's hemispheres weakest?
If two teams playing tug-of-war pull on a rope with equal but opposite forces, what is the net external force on the rope?
Write a 150-word paragraph or two that describes at least three everyday things that exist or occur because of science.
Which properties make a metal a good material to use for electrical wires?
malleability and reactivity
conductivity and ductility
ductility and malleability
reactivity and conductivity
Try this out. Use a calculator!
We can use the formula KE=0.5m*V^2. To find the kinetic energy (KE) of a payload of mass (m) 100 kg as it flies through the air at the velocity (v) of 55 m/s.
(Multiply 0.5 x the mass x velocity squared.)
Your answer will be in Joules (a measure of energy).
Question 3 options:
.
Question 3 options:
5500 J
151250 J
302500 J
2750 J
Answer:
b
Explanation:
your welcome
What are the formulas for Kinetic energy and Potential energy?
Answer:
E_kinetic=[tex]\frac{1}{2}[/tex]mν²
E_potential=mgh
Explanation:
m: mass of the body
ν: velocity of the body
g: gravity
h: height of the body
Answer:
[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2 \ , \ PE=mgh}}}}[/tex]
Explanation:
Kinetic energy formula
[tex]\displaystyle KE=\frac{1}{2} mv^2[/tex]
Potential energy formula
[tex]\displaystyle PE=mgh[/tex]
[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]
[tex]\displaystyle PE \Rightarrow \sf potential \ energy \ (J)[/tex]
[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]
[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]
[tex]\displaystyle g \Rightarrow \sf acceleration \ of \ gravity\ (m/s^2)[/tex]
[tex]\displaystyle h \Rightarrow \sf height \ (m)[/tex]
A bat moving with speed of 3.25 m/s and emitting sound of 35.0 khz approaches a moth at rest on a tree trunk. (a) what frequency is heard by the moth? (b) if the speed of the bat is increased, is the frequency heard by the moth higher or lower? (c) calculate the frequency heard by the moth when the speed of the bat is 4.25 m/s
what are the pioneer species that can break down rock during primary succession ?
A. Shrubs
B. Tress
C. Lichens
D. Grass
A child leaves her book bag on a slide. the bag, which is at the top of the slide, starts from rest and reaches the bottom in 1.47 s. the mass of the book bag is 2.45 kg, the length of the slide is 2.50 m and the angle of incline is 30.5°. (assume the +x-axis to be parallel to and down the slide. for all values, enter the magnitude only.)
Which is the most likely place a metamorphic rock might form? on the slopes of an active volcano on the ocean floor eight kilometers below earth's surface two hundred kilometers below earth's surface?
Cells that remain as sources of other cells are called
Stem cells are the source of other cells, with some referred to as totipotent or multipotent based on their differentiation potential. Transformed cells or cells from tumors can give rise to continuous or immortal cell lines that grow indefinitely in culture.
Explanation:Cells that remain as sources of other cells are known as stem cells. Stem cells have the unique capacity to self-renew and differentiate into various cell types. The ultimate stem cells found in the early embryonic stages are referred to as totipotent, as they can differentiate into any cell type necessary for the development of an organism. As development progresses, stem cells can become multipotent, retaining the ability to develop into multiple, but not all, cell types within a certain lineage, such as red or white blood cells. In specific cultures, certain cells like transformed cells or those from tumors can result in a continuous cell line and exhibit characteristics such as indefinite growth in culture when the medium is replenished; these are termed cell lines or, in some cases, immortal cell lines.
Stem cells are the sources of other cells, with varying degrees of differentiation potential: totipotent, pluripotent, and multipotent. In laboratory conditions, cells can also form a continuous cell line that can proliferate indefinitely, which is often used for research and medical purposes.
Explanation:Cells that remain as sources of other cells are commonly known as stem cells. These cells have the unique ability to differentiate into various cell types or continue to replicate as more stem cells. Notably, there are different potency levels of stem cells; totipotent stem cells can differentiate into any cell type or even an entire organism, pluripotent cells can become any cell type except for totipotent cells, and multipotent cells can differentiate into a limited range of cells within a lineage, such as blood cells. In a laboratory setting or medical applications, certain cells can be manipulated or derived to form a continuous cell line, which can be subcultured many times or even grown indefinitely under the right conditions. However, these cells sometimes exhibit chromosomal abnormalities and are not normal, especially if they originate from transformed cells or tumors. They may undergo transformations becoming 'cell lines' that proliferate indefinitely.
The movement of bones around a fixed angle without lateral displacement is called
If you pull a wool sweater over your head, you will often end up with a wild hairdo. Your hair is hard to comb and wants to stand up. Why?
Does a light year measure time brightness or distance
Which of the following are types of graphs? pictographs pie charts lettergraphs staticgraphs
Answer:
Pie charts
Explanation:
There are mainly four types of graphs:
1. Bar graphs- It used to represent data/numbers independent of each other.
2. Pie charts- used to show data as compared to the whole. The graph is circular and numbers represent the proportion.
3. Line graphs- used to show trend as the numbers change over a time.
4. Cartesian graphs- used to show the dependence of numbers on one axis on the numbers represented on another axis.
6. How did a change in voltage affect the use of an electromagnet?
This rock, known as balance rock, sits on a thin spike of rock in a canyon in idaho. explain the forces that keep the rock balanced on its tiny pedestal.
Answer:
Action force and Reaction force
Explanation:
The action force which is the balanced rock pushing down due to gravity and the reaction force pushing the equal amount of force. These two things are stated in Newtons third law, where he states that "Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first." Also, he states that "all forces acts in pairs," meaning that every force exerted, there is an opposite force on the first.
The balance rock in Idaho remains balanced due to the forces of gravity and normal force, along with careful positioning of its center of gravity directly over its point of contact with the pedestal.
Explanation:The balance rock, or any other item that seems to defy gravity by precarious balancing, relies on a couple of key forces. The first one is gravity, which pulls the rock downwards, and the second is the normal force, which is exerted by the underlying spike that stops the rock from going any further downwards. Additionally, the center of gravity of the rock is crucial. The center of gravity must be directly over the point of contact for the rock to stay balanced. If the center of gravity was not above this point, the rock would topple over as gravity pulled it downwards.
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The measure of energy transferred between two points in an electric circuit is?
Final answer:
The measure of energy transferred in an electric circuit is electrical potential energy, measured in joules. Electric potential or voltage is the energy per unit charge, and power is the rate at which electrical energy is converted, measured in watts. Ohm's Law relates current to voltage and resistance.
Explanation:
The measure of energy transferred between two points in an electric circuit is known as the electrical potential energy, and it is typically measured in joules. The term related to the amount of energy per unit charge needed to move a charge between two points in a circuit is called electric potential or voltage (V). The rate at which electrical energy is converted in an electric circuit is known as power (P), and it is measured in watts. Furthermore, Ohm's Law states that the current (I) through a conductor, at constant temperature, is proportional to the voltage across the resistor.
For a resistor with a voltage of 5 V across it, to find the current, you can use Ohm's Law (I = V/R), where V is the voltage and R is the resistance. Assuming the resistance (R) is 10 ohms (which seems to be a typo for "a 10 ohm resistor"), the current through the resistor would be I = 5 V / 10 Ω = 0.5 A (amperes).
If the velocity of an object changes from 15 m/s during a time interval of 4s what is the acceleration of the object
80 foot-pounds of work is needed to move the sofa in Tyler's apartment. Which of the following statements is true?
a.) If Tyler moves the sofa himself, he will do more work than if he gets a friend to help.
b.) If Tyler and his roommate move the sofa together, they will do half the amount of work.
c.) If the sofa does not move, no work is done.
d.)All of the above.
Answer:
C
Explanation:
Because getting a friend to help will not half the work, and if he does it alone it will not increase the work. Knowing A, and B are wrong, we know it can not be D for the first two options are wrong. Also proof of it being C: if an object moves no distance no work can be done. For example 80 x 0 = 0 The answer being amount of work being done.
Which change in an abiotic factor causes coral bleaching? a. increased salinity b. decreased salinity c. decreased turbidity d. increased temperature
The answer is "d. increased temperature".
At the point when corals are stressed by changes in conditions, for example, temperature, light, or supplements, they remove the symbiotic algae living in their tissues, making them turn totally white. Hotter water temperatures can result in coral bleaching. At the point when water is too warm, corals will oust the algae living in their tissues, making the coral turn totally white. This is known as coral bleaching.
When a coral blanches, it isn't dead. Corals can endure a bleaching occasion, yet they are under more pressure and are liable to mortality.
Answer: d.increased temperature
Explanation:
The colony of coral polyp (coral reef) and algae lives in mutualistic association in oceanic waters. In this association the coral reef receives it's color and algae receives food and shelter. The increase in temperature is the abiotic factor responsible for the removal of the algal colony from the coral reef. The increase in temperature of oceanic water, causes the algal colony to swell and the algal colony get remove from the coral reef . The coral reef looks white due to the composition of calcium carbonate. This phenomena is called as coral bleaching.
While sleeping, a 15.5 kg dog exerts a downward force on the ground. What is the magnitude of the upward force being exerted on the dog by the ground?
Final answer:
The magnitude of the upward force exerted on the 15.5 kg dog by the ground is equal to the dog's weight, calculated as the product of its mass and the acceleration due to gravity. This force equals 151.9 N.
Explanation:
The question pertains to the concept of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. In the context of this question, while the dog is sleeping and exerting a downward force due to gravity, the ground exerts an upward force of equal magnitude on the dog. This force is often termed the normal force.
To calculate the magnitude of this force, we use the formula for weight (W = m * g), where m is the mass of the dog (15.5 kg) and g is the acceleration due to gravity (approximately 9.8 m/[tex]s^2[/tex]). Thus, the weight of the dog, which is the force it exerts downward, is:
W = 15.5 kg * 9.8 m/[tex]s^2[/tex] = 151.9 N
The normal force will be equal in magnitude to the weight, but acting in the upward direction. Hence, the magnitude of the upward force exerted by the ground on the dog is also 151.9 N.
Final answer:
The magnitude of the upward force being exerted on the dog by the ground is approximately 151.9 N.
Explanation:
In this case, according to Newton's third law of motion, the magnitude of the upward force being exerted on the dog by the ground is equal to the magnitude of the downward force the dog exerts on the ground while sleeping. Therefore, the magnitude of the upward force is 15.5 kg multiplied by the acceleration due to gravity, which is approximately 9.8[tex]m/s^2[/tex] result, the magnitude of the upward force being exerted on the dog by the ground is approximately 151.9 N.
A script writer for the next Star Wars movie has proposed a scene where Kylo Ren’s spaceship lands on Jupiter. Which statement best describes this idea?
A. Worth consideration because it reflects the reality that real life astronauts maybe doing the same with in the next decade.
B. Unrealistic in real life because Jupiter has no surface on which to land and even if it did such a journey would be dangerous due to the harsh atmospheric conditions.
C. Unrealistic because Jupiter is the closest planet to the sun and therefore Kylo wrens spaceship would immediately blowup.
D. Worth consideration because it reflects the reality that Jupiter like earth, presently has all the conditions it needs in order to sustain a vast amount of life.
Correct option is B. The idea of a spaceship landing on Jupiter is unrealistic because Jupiter is a gas giant with no solid surface and has harsh atmospheric conditions that would be dangerous for space travel.
The proposed scene in the Star Wars movie where Kylo Ren's spaceship lands on Jupiter is described best by option B.
This scenario is unrealistic in real life because Jupiter is a gas giant and thus does not have a solid surface on which a spaceship can land. Moreover, even if it hypothetically had a surface, the journey would be extremely dangerous due to the planet's harsh atmospheric conditions, including intense radiation belts, strong magnetic fields, and extreme pressures and temperatures.
What is the difference between a data table and a graph?
Tables are also helpful when you have a lot of different units of measurement, which can be tough to do in a graph in an simpler to read way. In contrast, graphs interact with our visual system.
What is a graph?A graph is a mathematical representation of a network that implies the interconnection between lines as well as points.
A graph is composed up of points with lines intersecting them. The length of the lines along with the position of the points are irrelevant. Each object in a graph is renowned to as a node.
Since they gives information quickly as well as easily, graphs and charts are also effective visual tools.
The data table is the most functional basic building block of business intelligence.
In its most basic form, it consists of a series of columns and rows that intersect in cells, plus a header row that states the names of the columns to make the table's content understandable to the end user.
Thus, this is the basic difference between the data table and a graph.
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By how much does the speed of a vehicle moving in a straight line change each second when it is accelerating at 2 km/h·s? At 4 km/h·s? At 10 km/h·s?
Please include ALL work, thanks! :)
The change in speed of a vehicle moving in a straight line each second can be calculated using the formula:
change in speed = acceleration × timeacceleration is measured in km/h·stime is measured in seconds.For an acceleration of 2 km/h·s:
change in speed = 2 km/h·s × 1 s = 2 km/h
For an acceleration of 4 km/h·s:
change in speed = 4 km/h·s × 1 s = 4 km/h
For an acceleration of 10 km/h·s:
change in speed = 10 km/h·s × 1 s = 10 km/h
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