CHEMISTRY HIGH SCHOOL

Which is an example of negative acceleration?

Answers

Answer 1
Answer:

Answer:

When we throw a projectile up, the negative gravity acceleration acts on it. Thus, when the ball reaches the highest point, the speed of the ball becomes zero.

Explanation:

Acceleration is a vector magnitude that indicates the variation of speed per unit of time.

As displacement, velocity and acceleration are vectors we will analyze this vectorly.

We consider positive acceleration when the acceleration vector is directed in the same direction as the movement. (Acceleration)

On the other hand, we consider negative acceleration when the acceleration vector is directed in the opposite direction to the movement. (de-acceleration)
Answer 2
Answer: when the driver push the car's brake the acceleration decrease and become negative

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505 Kl expressed in liters
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NEED HELP! Assume that the variables x and y are directly related. If k = 8, what is the value for each of the following points? Be sure and record your data to be used in the following problem. x y k 0.5_________8 1___________8 2___________8 3___________8
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Formula A: CH3Formula B: C2H6Given the two formulas representing the same compound:Which statement describes these formulas?(1) Formulas A and B are both empirical.(2) Formulas A nd B are both molecular.(3) Formula A is empirical and Formula B is molecular.(4) Formula A is molecular and Formula B is empirical.

The shape of a molecule is tetrahedral. How many lone pairs are most likely on the central atom?zero
two
three
four

Answers

Answer: Zero lone pairs on the central atom.

Explanation:

  • Lone pairs and bond pairs together decides the geometry of the molecule.
  • Bond pairs  together decides the shape of the molecule.

The molecule is with with tetrahedral shape which means that molecule has a tetrahedral geometry.

The value of number of electrons around the central atom with tetrahedral geometry according to VESPR theory is '4'. Which means that electrons around the central atom are 4.

Since, the molecule is in tetrahedral shape which means four bonds are pointing in direction towards the four vertices of tetrahedral which means their are zero lone pair present on the central atom.
The number of lone pairs that are most likely found on the central atom is zero. There are no lone pairs found on the central atom.

the average adult human male has a total blood volume of 5.0 L. if the concentration of sodium ion in this average individual is 0.135 M, what is the mass of sodium ion circulating in the blood?

Answers

Molarity is a way of expressing concentration that is equal to the ratio of the moles of the solute to the liters of solution. The amount of substance in moles can be calculated through,
                         moles = (molarity) x (volume in liters)
Substituting the values,
                         moles = (0.135 M) x (5.0 L) = 0.675 moles
Multiply this value with the molar mass of sodium ion,
                         mass = (0.675 moles) x (23 g/ mole) = 15.525 grams
Therefore, the mass of sodium ion in the blood is 15.525 grams.  

How is the periodic table constructed ?

Answers

Before the periodic table, there were a bunch of symbols, number, letters etc (In all kinds of languages) that represented the elements. Scientists around the world saw that a chart of the elements needed to be universally accepted and finalized. A guy named Mendeleev presented this idea to the scientific community. Mendeleev was also the first to order elements according to atomic number rather than atomic weight. The modern day periodic table was not published by him, it was developed with the help of the entire scientific community. Honestly, there isn't a specific way to tell you how the periodic table was constructed, scientists developed thousands of tables that represented the elements. And just to let you know, the modern day periodic table is constantly going through changes as we discover more and more about elements, atoms, molecules etc. so in the near future it wouldn't be surprising if we saw something completely different than what we see today.
The Periodic Table is in order of electrons, and the columns are set up to show the amount of electrons in the outer most orbit.

All atoms of the same element have the same ____.

Answers

Answer:

The correct answer is protons.

Explanation:

Hello! Let's solve this!

All atoms of the same element have the same number of protons. The isotopes of an element are chemical species that change the number of neutrons but not that of protons.

Then the different atoms of the same element differ in their protons.

The correct answer is protons.

All atoms of the same element have the same number of protons.

Protons are subatomic particles that are found within the nucleus of an atom. They have a positive electrical charge, which is equal in magnitude but opposite in sign to the negative charge of electrons. Protons are one of the three main types of particles found in atoms, along with neutrons and electrons.

The number of protons in an atom determines its atomic number and defines the element. For example, an atom with one proton is hydrogen (H), while an atom with six protons is carbon (C).

Learn more about protons, here:

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Researchers have now been able to cool substances to absolute zero.
a. True
b. False

Answers

Answer:

The correct option is B) false.

Explanation:

Absolute zero is the point where it is not feasible to cool further.

The lowest possible temperature is 0 kelvin which is also known as absolute zero. In degrees its corresponds to –273.15 degrees Celsius.

it is not possible to reach or cool a substance to absolute zero although nearby temperatures can be reached.

Consider the provided statement.

Researchers have now been able to cool substances to absolute zero is a false statement.

The correct option is B) false.
This Answer Is False.

What is the molar mass of C2H6O

Answers

46.0684g I think because you have to concert grams to moles or moles to grams
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