1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bija089 [108]
3 years ago
9

Which of the following people believed the atom to be indivisible?

Chemistry
1 answer:
monitta3 years ago
5 0
Democritus because of Greek atomism. In the 5th century BCE, Leucippus and his pupil Democritus proposed that all matter was composed of small indivisible particles called atoms.
You might be interested in
Chalcopyrite is an ore with the composition cufes2. what is the percentage of iron in a 39.6 g sample of this ore? answer in uni
iren2701 [21]
<span>Well it depends on percentage by what, but I'll just assume that it's percentage by mass. For this, we look at the atomic masses of the elements present in the compound. Cu has an atomic mass of 63.546 amu Fe has 55.845 amu and S has 36.065 amu Since there are 2 molecules of Sulfur for each one of Cu and Fe, we'll multiply the Sulfur atomic weight by 2 to obtain 72.13 amu So we have not established the mass of the compound in amus 63.546 + 55.845 + 72.13 = 191.521 That is the atomic mass of Chalcopyrite. and Iron's atomic mass is 55.845 So to get the percentage, or fraction of iron, we take 55.845 / 191.521 Which comes out to 29.15% by mass Mass of the sample is not needed for this calculation, but since the question mentions it I would go ahead and check if the question isn't also asking for the mass of Iron in the sample as well, in which case you just find the 29.15% of 67.7g</span>
5 0
3 years ago
An elements atomic number tells you the number of
liq [111]
The number of protons in the nucleus of the atom, I believe.  c:
8 0
3 years ago
Name the SI base units that are important in chemistry, and give the SI units for expressing the following: (a)length, (b) volum
kirza4 [7]

Answer and Explanation:

The basic unit which are that are important in chemistry are meter, kilogram ,mol,m^3

Candela which is the unit of luminous of intensity is not so important in physics

(a) SI unit of length is meter (m)

(b) Si unit of volume is m^3

(c) Si unit of mass is kilogram (kg)

(d) SI unit of time is second (s)

(e) SI unit of temperature is kelvin (K)

4 0
2 years ago
Identify 3 items that are malleable
Stels [109]
Some examples of malleable materials are gold, silver, iron, aluminum, copper and tin.
8 0
3 years ago
What energy conversion occurs when a battery powered car rolls across the floor?
tester [92]
"Stored electrical energy is converted to mechanical energy" is the one energy conversion among the choices given in the question that <span>occurs when a battery powered car rolls across the floor. The correct option among all the options that are given in the question is the second option or option "B".</span>
3 0
3 years ago
Other questions:
  • Which of the following phase changes only occurs in solids possessing vapor pressures above atmospheric pressure and at ambient
    9·1 answer
  • Which statements describe inorganic compounds?
    15·1 answer
  • What is the atomic mass of a carbon isotope that has 6 protons and 7 neutrons?
    5·2 answers
  • A 65.0-gram sample of some unknown metal at 100.0° C is added to 177.1 grams of water at 24.5° C. The temperature of the water r
    8·1 answer
  • Identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chlo
    11·1 answer
  • The building blocks of DNA are like alphabet letters,
    12·1 answer
  • Deforestation, intensive agriculture, and drought can result in a condition called
    9·2 answers
  • For questions 14-16 pick out the variables that will be needed to answer the following question: Do trees grow faster if it is w
    9·2 answers
  • The table below shows the number of sub-atomic particles in an atom of magnesium.
    5·1 answer
  • CH3CHClCH(CH3)CH2CH2CH2CH2Br name the molecule iupac rules please
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!