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zalisa [80]
4 years ago
5

Which of these is an accurate statement about scientific variables? A. They can be connected to one another. B. They are the sam

e in every experiment. C. There can only be one variable in any experiment. D. There is no way to know what variables are most important.
Chemistry
2 answers:
chubhunter [2.5K]4 years ago
4 0

The awnser is A they can be connected  to one another

inna [77]4 years ago
3 0

The correct option is A.

In scientific investigation, variable refers to those parameters that are manipulated or changed in an experiment. Variables are those factors or conditions that can exist in different amounts in a scientific investigation. There are three major types of experimental variables, these are, independent, dependent and controlled variables. All the variables that are used in an experiment are usually connected to one another, scientific investigators typically look for the relationships among the variables in order to depict how they associate with one another.

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A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance.
professor190 [17]

Answer:

E. just before it reaches the ground.

Explanation:

The "kinetic energy" refers to the energy<em> when an object moves or is in motion.</em> When the ball leaves the racket, it is considered to have a great amount of kinetic energy. However, this decreases as the ball reaches its maximum height, but the potential energy is at its highest. Upon falling down, its kinetic energy increases but its potential energy decreases.

<em>Provided that there's no air resistance,</em><em> the speed of falling is even faster for the ball because of gravity and nothing is slowing it down, </em>which means it will have a<u> maximum kinetic energy</u><u> just before it reaches the ground.</u>

7 0
3 years ago
What is the effect of temperature on the solubility of :
m_a_m_a [10]

Answer:

A

Explanation:

3 0
3 years ago
What two subatomic particles have to be different in order to have an ion?
lisabon 2012 [21]

Answer:

A)Protons and electrons

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

when an atom lose or gain the electron ions are formed and number of protons and electrons no longer remain the same.

For example:

An atom of sodium when lose one electron it form positive ion. The number of electrons became 10 and number of protons remain 11.

Na → Na⁺ + 1e⁻

6 0
3 years ago
How many C-13 atoms are present, on average, in a 2.1000×104-atom sample of carbon?
Tasya [4]
C-13 or Carbon-13 is an isotope of carbon that has a relative abundance of 1.109%. The other isotopes of carbon are C-12 and C-14. We use this percentage to multiply to the total atoms of carbon. The solution is as follows:

2.1×10⁴ atoms * 1.109/100 = 232.89 atoms of C-13
3 0
4 years ago
Which of the following theories provides information concerning both molecular shape and bonding?
Gemiola [76]
The answer is the VSEPR theory 
4 0
4 years ago
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