Answer:
The answer to this question is......C
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, Sr is the element which is most reactive. The correct option is option C.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
On going down the group of periodic table, size increases due to increase in number of shells, easiness to eject one electron increases. Group 2 elements are the most reactive as it has only 2 electrons to loose. Sr is the element which is most reactive among all the given options.
Therefore, Sr is the element which is most reactive. The correct option is option C.
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Using the graph above, what was the cost of the most expensive invasive species?
200 billion US dollars
10 billions US dollars
148 billion US dollars
50 billion US dollars
Is this statement true or false?
The size and color of an object effects how it moves.
TRUE
FALSE
Answer:
True
Explanation:
The size of an objects effects how it moves
If the size is large the object moves slowly
And if the size is small the object move fastly
How is momentum conserved in a system in which two satellites connect?
A)The one satellite has all the momentum before they connect, and then afterwards they share it.
B)Both satellites have momentum before they connect, and afterwards they have more momentum.
C)Both satellites have momentum before they connect, and afterwards they have less momentum.
D)Momentum is not conserved when the two satellites connect.
Answer:
Explanation:
C)Both satellites have momentum before they connect, and afterwards they have less momentum.
In physics, the law of conservation of momentum states that the momentum of an isolated system remains constant, unless acted upon by an external force. When two objects interact, the total momentum of the system before the interaction is equal to the total momentum of the system after the interaction.
When two satellites connect, their momentum can be considered as a closed system, meaning no external forces act upon them, and the total momentum of the system is conserved. This means that the total momentum of the two satellites before they connect is equal to the total momentum of the two satellites after they connect.
It is important to consider that when two objects connect, the kinetic energy of the system increases due to the relative motion of the two objects. This increase in kinetic energy can be converted into other forms of energy, such as heat, sound, and deformation. So the two satellites, even though they are now connected, will have less momentum and less kinetic energy due to these conversions.
Option D, that is momentum is not conserved when the two satellites connect, is incorrect as the law of conservation of momentum applies to isolated systems, and if no external force acted upon the two satellite the total momentum of the system must remain constant.
Pluto was considered a planet from its discovery in 1930 until 2006. Why is it no longer called a planet?
A) Pluto does not directly orbit the Sun.
B) Pluto has not cleared its orbit of other objects.
C) Pluto does not orbit on the same plane with the other planets.
D) Pluto has not attained hydrostatic equilibrium.
It's not C, that's what I know
Answer:
B) Pluto has not cleared its orbit of other objects.
Explanation:
Pluto is a dwarf planet b/c it has not cleared its orbit of other objects.
Directly from library of congress: https://www.loc.gov/everyday-mysteries/astronomy/item/why-is-pluto-no-longer-a-planet/
Answer: D) Pluto has not attained hydrostatic equilibrium
Explanation:
What is an ellipse?
a circular orbit
an oval-shaped orbit
the center of gravity between orbiting objects
Explanation:
An eclipse is an astronomical event that occurs when an astronomical object or spacecraft is temporarily obscured, by passing into the shadow of another body or by having another body pass between it and the viewer.
Finish the statement: A dwarf planet…
has enough mass to orbit either a planet or the Sun.
has enough mass to clear its orbit of other objects.
has enough mass to attain a spherical shape.
doesn't have enough mass to have its own moon.
It's not A
Answer:
has enough mass to attain a spherical shape.
Explanation:
hope this helps
YOU'LL GET 60 POINTS + 5 STARS + HEART FROM ME IF YOU ANSWER THIS WITHOUT TROLLING
The table below shows the volume of two samples, X and Y, when placed in three containers of different volumes.
Volume of Samples
Volume of Container Volume of Sample X Volume of Sample Y
200 mL 200 mL 200 mL
500 mL 200 mL 500 mL
600 mL 200 mL 600 mL
Which of the following correctly describes the state of matter of one of the samples? (5 points)
a
Y is a gas because it has a definite volume.
b
X is a liquid because it has a definite volume.
c
Y is a liquid because it fills up the entire container.
d
X is a gas because it fills up the entire container.