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Kaylis [27]
3 years ago
6

Why is Dalton credited with proposing the first atomic theory if Democritus was talking about atoms almost 2,200 years earlier?

Chemistry
2 answers:
PolarNik [594]3 years ago
6 0
I just had this question and I got it wrong but here's what is says to put:  Democritus' ideas were not supported by evidence. Dalton's theory was the first scientific theory because it relied on scientific investigative processes. Dalton's theory was supported by evidence and repeated investigation. 
german3 years ago
4 0
Democritus *suggested* the existence of the atom, that everything was made up of tiny particles, but wasn't really able to get more specific than that. Dalton also theorized that everything was made up of indivisible particles, but went further basing his theory on actual scientific principles, such as the Law of Conservation of Mass and the Law of Constant Composition. He also said that atoms weren't created or destroyed in a chemical reaction, just rearranged.  There's more to it than that, but basically, Dalton's theory was based more on science while Democritus' theory was too general to be useful in chemical situations.
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How is the periodic table organized?
joja [24]

Answer:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

Explanation:

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Which of the following describes the physical state of the layers of the Earth from the outside to the center?
Phantasy [73]
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Which atom in the ground state has an outermost electron with the most energy?(1) Cs (3) Li(2) K (4) Na
Leokris [45]
<span>The answer is Cs, no. 2.
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8 0
3 years ago
A spoon of salt is added to water. Which of these will increase how fast the salt dissolves? Check all of
iren [92.7K]

Answer:

B

Explanation:

A is wrong because heat is what makes the process faster.

B is right because the finer grains are able to dissolve at a higher rate since the amount of one grain reduces it's time to dissolve.

C is wrong because simply adding more water will not increase or decrease the dissolving rate.

4 0
3 years ago
How much energy is required to raise the temperature of 3kg of iron from 20 degrees Celsius to 25 degrees Celsius
Yuri [45]

Answer:

6750 J

Explanation:

The specific heat capacity of iron is 450 J/kg/K

Quantity of heat = mcθ; where m is the mass and c is the specific heat capacity and θ is the temperature change.

Therefore;

m = 3 kg, c = 450 J/kg/K and θ = 5°C

Quantity of heat = 3 × 450 × 5

                           <u>= 6150 Joules</u>

5 0
2 years ago
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