CHEMISTRY HIGH SCHOOL

Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that _____. A. all of Dalton's hypotheses are correct
B. atoms of an element can have different numbers of protons
C. atoms are divisible
D. all atoms of an element are not identical but they must all have the same mass

Answers

Answer 1
Answer: Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that atoms are divisible. The answer is letter C

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Concentrated hydrogen peroxide solutions are explosively decomposed by traces of transition metal ions (such as Mn or Fe): 2H2O2(aq) ---> 2H2O(l) + O2(g)What volume of pure O2(g), collected at 27C and 746 torr, would be generated by decomposition of 125 g of a 50.0% by mass hydrogen peroxide solution?
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The inorganic component of soil is a. made of decayed plant and animal remains
b. rock and mineral fragments
c. hydrocarbon gases

Answers

 sure its b but im preatty sur dont spell check me plz 

It's B.Rock and mineral fragments.

Unknown element X combines with oxygen to form the compound XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X?A. 16 amu
B. 44 amu
C. 88 amu
D. 176 amu
E. 352 amu

Answers

Oxygen has a Mr of 16 and half of 16 is 8 which is how many grams used. If 44 grams of X is used it must have an amu of 88. (Times 2)

Why do comets have tails

Answers

Answer:

Comets are composed of ice, dust and frozen gases. The core of the comet is known as nucleus which is formed of rocks and frozen gases. Coma is the atmosphere of the comet. As the comet enters the inner solar system, the coma expands due to sublimation of frozen gases. As it nears the sun, the coma extends backwards and forms a long tail. It extends backwards due to the solar wind. The charged particles from the sun take away the evaporated material and dust of the comet backwards forming tail.

As a comet approaches the Sun, it starts to heat up. The ice transforms directly from a solid to a vapor, releasing the dust particles embedded inside. Sunlight and the stream of charged particles flowing from the Sun – the solar wind – sweeps the evaporated material and dust back in a long tail.

What is the mass percent of sodium in NaCl?

Answers

The mass percent of sodium in NaCl can be determined by dividing the mass of sodium by the total mass of the compound (NaCl), then multiplying the result by 100. So, 39.34% of the mass of sodium in NaCl is composed of sodium.

The molecular weight of chlorine (Cl) is 35.45 g/mol while that of sodium (Na) is 22.99 g/mol.

The molecular weight of NaCl is calculated as follows:

  • Na: 1 atom * 22.99 g/mol = 22.99 g/mol
  • Cl: 1 atom * 35.45 g/mol = 35.45 g/mol

Total molecular weight = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

To determine the sodium mass percent in NaCl:

(mass of sodium / total mass of NaCl) * 100 to get the mass percent of sodium.

(22.99 g/mol / 58.44 g/mol) x 100 = 39.34% sodium mass percent

As a result, 39.34% of the mass of sodium in NaCl is composed of sodium.

Learn more about Mass percent, here:

brainly.com/question/14990953

#SPJ6
mass percent of sodium is mass of sodium divided by total mass of NaCl then multiplied by 100%.  That means that percent mass equals (23g/58.45g)×100% which equals 39.3%.
Therefore the percent mass of sodium in NaCl is 39.3%
I hope this helps.  Let me know if anything is unclear.

What are the intermolecular forces that exist between molecules of NH3, H2O and HF called ?

Answers

I think, is HYDROGEN BOND!
This is some kind of  is the electrostatic attraction between polar molecules that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F)... see image below! ;-)

Final answer:

The intermolecular forces that exist between molecules of NH3, H2O, and HF are hydrogen bonding, dipole-dipole interactions, and London dispersion forces.

Explanation:

The intermolecular forces that exist between molecules of NH3, H2O, and HF are called hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Hydrogen bonding occurs between a hydrogen atom bonded to a highly electronegative atom (such as O, N, or F) and a lone pair of electrons on a nearby molecule. Dipole-dipole interactions occur between molecules with permanent dipole moments, while London dispersion forces occur due to the temporary formation of induced dipoles in adjacent molecules.

Which atomic model proposed that electrons move in specific orbits around the nucleus of an atom

Answers

The atomic model that proposed that electrons move in specific orbits around the nucleus of an atom is the Bohr model, or the Rutheford-Bohr model, envisioned by Niels Bohr in 1913.
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