Answer: Fluorine (F) and chlorine (Cl) are two good choices. See reasoning below.
Explanation: Mendeleev arranged the elements in the periodic table in a manner that each group, or vertical column, contained elements that exhibited similar chemical properities. He even reserved spaces for undiscovered elements when none of the known elements had properties similar to those above or below the known elements in a group. An interesting event illustrates this property. In December 2010, NASA announced an important new discovery that was to be broadcast on live TV, creating much speculation (e.g., UFO's are real and we'll see the aliens sequestered at Roswell!!! I knew it.).
The actual announcement:
"Dec. 2, 2010: NASA-supported researchers have discovered the first known microorganism on Earth able to thrive and reproduce using the toxic chemical arsenic. The microorganism, which lives in California's Mono Lake, substitutes arsenic for phosphorus in the backbone of its DNA and other cellular components."
A look at the periodic table shows arsenic just below phosphorus, in the same group. This was an unexpected find, but it might have been predicted with an understanding of how the elements are organized.
Side note: look how close silicon is to carbon. Can there be a life form whose being is made up of silicon instead of carbon? Sure . . . why not? Maybe not on Earth, but . . . wait . . . did that marble statue just wink?
a boy cycles a distance of 960 m from home to school in 8 minutes. calculate his average speed for the journey
120m per minute
Explanation:If you take 960 and divide it by 8 you get 120 then you have the answer 120m per minute
Describe in your own words a situation where chemical energy is transformed to potential energy.
Answer:
The potential energy stored in molecules can be converted to chemical energy, which can ultimately be converted to kinetic energy, enabling an organism to move. Eventually, most of energy used by organisms is transformed into heat and dissipated.
Explanation:
Everything in the physical universe is composed of matter which has mass and occupies space.
True or False?
PLEASE I NEED HELP FAST
Answer:
Its True
Explanation:
hope this helps
Explain swimming based on one of the laws of motion?
Answer:
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. Thus, swimmers must stroke downward in the water to stay afloat and propel forward. This movement is equal and opposite to the force the water exerts against the swimmer to stop them from moving.
Which of the following is same dimension quantity?
Work and Power
power and Potential energy
Potential energy and Pressure
Potential energy and Work
Answer:
Find the dimension of each and every quantity in all the options to check whether they are the same or not. We can use any one formula of each identity to find its dimension.
Complete step by step solution:
To find the dimension of a quantity, we can use any formula related to that quantity but we will use the easiest ones to save time.
Force-
from Newton’s law of motion,
F=maF=ma
Dimension of force =[M][LT−2]=[MLT−2]=[M][LT−2]=[MLT−2]
Work done-
W=F×sW=F×s
Dimension of work=[MLT−2][L]=[ML2T−2]=[MLT−2][L]=[ML2T−2]
Momentum-
p=mvp=mv
Dimension of momentum=[M][LT1]=[MLT−1]=[M][LT1]=[MLT−1]
Impulse-
I=F×tI=F×t
Dimension of impulse=[MLT−2][T]=[
Which of the following occurs during the process of a liquid changing to a gas (boiling)?
The temperature increases.
The temperature remains the same.
The temperature decreases.
Answer:
the process that occurs when liquid changes to gas(boiling) is temperature increases
Answer:
The temperature increases
Explanation:
When a substance is converted from liquid state to gaseous state the particles get excited.The excitement raises the temperature of the substanceElectronic signals can travel very long distances in _______ fibers, due to total internal reflection.
Answer:Optical
Explanation:
what do the astrometric, doppler, and transit methods share in common?
They all search for planets by measuring properties of a star rather than of the planets themselves. ... The size of the Doppler shift that we detect depends on the tilt of a planet's orbit.
What is the total distance travelled? What is the displacement of the object?
Hi there!
Distance and displacement are different.
Distance is WITHOUT direction (scalar quantity)
Displacement TAKES INTO ACCOUNT direction (vector quantity), and is RELATIVE to the initial point.
DISTANCE:
Add up each segment's position:
0 - 2 sec: 0 m
2 - 5 sec: 10 - 4 = 6 m
5 - 6 sec: 0 m
6 - 8 sec: 10 - 2 = 8 m
8 - 9 sec: 0 m
9 - 12 sec: 5 - 2 = 3 m
Add up:
6 + 8 + 3 = 17 m
DISPLACEMENT:
To find displacement, simply look at the position at the final point (t = 12 sec) and compare to the initial position:
At t = 12: Position = 5 m
At t = 0: Position = 4 m
5 - 4 = 1 m
_______is the force that keeps us all stuck to the surface of our planet.
Answer:
gravity
Explanation:
why do we place window downward and ventilation upward?
Answer:
Doors, Windows & Ventilator is a part of building component which is allow to Air & light move & circulate inward & outward, with in door Human or any other material can be move inside or outside also. here types of doors & windows & ventilation are given with necessity of location, function etc.
Window ventilators are used for ensuring a supply of fresh air from the outside into the interior. They are used in rooms with natural ventilation, mechanical extract ventilation or hybrid ventilation. ... It automatically adjusts the inflow of fresh air depending on the level of relative humidity in the room.
Explanation:
diamond sparkles in dim light give reason
Answer: As the light moves through the diamond, it is scattered and fractured, creating the sparkle that diamonds are known for. This is the refraction. ... This refraction and dispersion also creates natural light and dark areas in the refracted light, depending on where the light hits along the planes of the diamond
Explanation:
A new model BMW can start from rest and travel 400 m in 16 s. a. What is its acceleration during this time? [2] b. Calculate the final speed of the car. [2] c. How fast is this final speed in km/h?
Answer:
acceleration = 3v 125 m/s^
final speed= 50 m/s
final speed in km/hr = 180 km/hr
Explanation:
A new model BMW can start from rest and travel 400 m in 16 s.then the acceleration during this time would be 1.5625 m/s²
What are the three equations of motion?There are three equations of motion given by Newton
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem, A new model BMW can start from rest and travel 400 m in 16 s
distance covered by BMW = 400meters
initial velocity(u) = 0 m/s
time = 16 seconds
acceleration(a) =? m/s²
By using the second equation of motion given by newton
S = ut + 1/2at²
S = 400 m ,u= 0 m/s , and t =16seconds
400 = 0 + a16²
a =400/256
a = 1.5625 m/s²
For the final speed of the car
v= u + at
v = 0 + 1.5625×16
v = 25 m/s
For calculating the speed in km /h
v = 25 ×3600/1000
= 90 km/h
Thus, the acceleration during the first 16 s time would be 1.5625 m/s²
Learn more about equations of motion from here
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Please guide me for uniform speed
Explanation:
uniform speed is just the consistent ratio of distance to time. it can a
so be thought as the speed of an object that does not change. an example is when a car moves at a speed of 60km/hrs without changing its speed. it keeps on moving at the same speed it started with
hope this becomes helpful
thanks
What are at least 3 examples of sublimation?
Sublimation is solid skipping the melting to a liquid stage andngoing staright to a solid.
Answer:
dry ice, air fresheners, polar evaporation, arsenic treatment
how can light travel from a source to another location?
Answer:
directly from the source through empty space
Will give 45 points to who ever solves this
Answer:
1)m=230 kg
w= 2254( approximately 2300) newtons
g= 9.8 m/s^2(approximately 10)
2)m= 90.5( approximately 88.7) kg
w= 887 N
g= 9.8 m/s^2(approximately 10)
3) m= 420 kg
w= 4,116 (approximately 4220
g= 9.8 m/s^2(approximately 10)
4) m=15kg
w=55.5N
g=3.7 m/s^2
Explanation:
The wanswers given in brackets is to signify the results of using 10m/s^2 as the gravity if u have any misunderstanding text back
I'm not sure whether it is electrically, by radiation or by heating?
thanks:)
WILL MARK BRAINLIEST
How much work is done on an object that is moved to acquire a displacement of 5 meters when 500 Newtons of force was exerted?
Answer:
2,500 Joules (J) or Newton Meter (N M)
Explanation:
Work = Force x Distance
The force in this equation is 500 Newtons. The distance (displacement) is 5 meters. Plug it into the equation above.
Work = 5m x 500n
Work = 2,500 Joules or Newton-Meters.
Therefore 2,500 Joules or Newton Meters of work is done on an object.
Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to____
which aided in the formation of____
1. A.Increase
B. Decrease
C. Remain constant
2. A. Chloroplast
B. Roots
C. Soil
Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to increases which aided in the formation of soil.
What is photosynthesis ?The process in which use of solar energy occur by plants, algae and certain bacteria convert them into chemical energy and starch called as photosynthesis.
Photosynthesis occur in chloroplast of the green plant which has its own DNA, genes and synthesize their own proteins.
photosynthetic Pigments are also involve in this process which is responsible for trapping sunlight present in chlorophyll pigment of chloroplast, like chlorophyll a, b and c.
some of the Bacteria have chlorophyll known as bacteriochlorophyll which can absorb infrared rays, Carotenoids which are yellow, orange or red-coloured pigments that absorb bluish-green light., Xanthophyll, Phycobilins.
For more details regarding photosynthesis, visit
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1. True or False: Most things in motion are accelerating, few things in real life move at a constant speed.
2. Slowing down is negative acceleration or ____________.
(I need Helpppppp pleaseee)
The truck now weighs 147,000 N what is the new mass of the truck
Answer:
14700kg
Explanation:
If you divide it by 10
1) ¿Cuáles son los
beneficios de lograr
niveles aceptables de
aptitud física
relacionada con las
habilidades?
Answer: Controlar el sobrepeso bajas grasa , te pone de buen homor , te da mas energia , Te ayuda mantenerte saludable y combatir enfermedades.
Find the displacement the body in the following graph
Answer:
150
Explanation:
15m/s×10s= 15m/a
and that is the correct answer
What is the definition of the word equality in your own words?
Answer:
Equality is the state of being equal in rights word and oportunities
Disilicon Trisulfide formula?
bro i need help omg.
Answer:
25.
Explanation:
5
because you're taking off the front number which is one
un paracadutista di massa 70kg scende per 100m a velocità costante.
quanta energia dissipa la resistenza del mezzo?
Answer:
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I NEED THE RIGHT ANSWER ASAP IT NEEDS TO BE 100% ACCURATE NO LINKS !!!
What happens when multiple forces act on an object?
1: The object will move if the forces are unbalanced.
2: The object will always stay in place.
3: The object will always move.
4: The object will move if the forces are balanced.
Answer:
The object will move if forces are unbalanced
true or false sliding friction is stronger than static friction
Answer:False static friction helps us from not sliding it hold us.
Explanation: