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
SVEN [57.7K]
4 years ago
15

Who was the first to state the concept of an atom

Chemistry
1 answer:
marin [14]4 years ago
6 0
Democritus, a Greek philosopher, first developed the idea of atoms (around 460 B.C., I believe).
Hope this helps!
You might be interested in
What two things do all matter have in common?
ELEN [110]

Answer:

mass and occupies space

Explanation:

matter is made up of mass and mass takes up space

3 0
3 years ago
Read 2 more answers
What amount of energy is required to completely ionize 27.8 grams of carbon atoms in the gas phase (c(g)) if the ionization ener
zlopas [31]
I think it would be 2,510 kJ, or 2,510,000 J.
3 0
3 years ago
How do you balance the equation Hydrogen plus Oxygen yield water?
Andre45 [30]
Hey there! Hello!

Not sure if you still need the answer to this question, but I'd love to help out if you do. 

So, the way to balance this equation is pretty simple. First, you need to keep in mind that molecules of hydrogen and oxygen do not come in single molecules, but in bonded pairs, represented by H2 and O2. 

H2+O2=H2O

But, that's incorrect. The combination of 2 hydrogen molecules with 1 oxygen molecule yields water, but that leaves one oxygen molecule leftover. When broken down, this is how many of each molecule is on each side of the previously stated equation:

Left:
H: 2
O: 2

Right:
H: 2
O: 1

So we have to multiply H2O on the right side by 2 in order to get this:

H2+O2=2(H2O)

Left: 
H: 2
O: 2

Right: 
H: 4
O: 2

The last step is to multiply H2 on the left by two to make it match up with the right side, balancing the equation:

2(H2)+O2=2(H2O)

Left: 
H: 4
O: 2

Right: 
H: 4
O: 2

That makes our equation balanced! I hope this helped you out, feel free to ask any additional questions if you need further clarification. :-)
5 0
3 years ago
The densities of crystalline co2 and nh3 at 160 k are 1.56 and 0.84 g/cm3, respectively. calculate their molar volumes.
Neporo4naja [7]
The molar volume, symbol Vm<span>, is the </span>volume occupied by one mole of a substance at a given temperature and pressure. <span>It is equal to the </span>molar<span> mass divided by the mass density. Therefore, we calculate as follows:

Vm(CO2) = 44.01 / 1.56 = 28.21 cm^3 / mol
</span>Vm(NH3) = 17.03 / 0.84 = 20.27 cm^3 / mol
7 0
3 years ago
Read 2 more answers
What is the mass of silver in 3.4g of AgNO3?
Licemer1 [7]
3.4g AgNO3 x (1 mole AgNO3/169.8732g AgNO3) x (1 mole Ag/1mole AgNO3) x (107.8682g Ag/1 mole Ag) = 

<span>2.2 grams Ag </span>
<span>(2 significant figures </span>
7 0
3 years ago
Other questions:
  • What happens in this reaction and why? <br><br> hept-3-yne + Br2 --&gt;
    15·1 answer
  • How is the periodic table organized?
    14·2 answers
  • Consider the Gibbs energies at 25 ∘ C. Substance Δ G ∘ f ( kJ â‹… mol − 1 ) Ag + ( aq ) 77.1 Cl − ( aq ) − 131.2 AgCl
    15·1 answer
  • A 73.6 g sample of aluminum is heated to 95.0°C and dropped into 100.0 g of water at 20.0°C. If the resulting temperature of the
    8·1 answer
  • The components of a longitudinal wave include __________.
    5·1 answer
  • What is a molecular formula?
    15·1 answer
  • What is Co³⁺ and Co¹⁺
    15·1 answer
  • (R)-Limonene is found in many citrus fruits, including oranges and lemons. Draw its structures and identify the relationship bet
    11·1 answer
  • Which measurement is a vector?
    5·1 answer
  • I need the answers of these
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!