What is the modification of the Dalton's atomic theory

2 answers:

3 0

Part two of Dalton's theory had to be modified after mass spectrometry experiments demonstrated that atoms of the same element can have different masses because the number of neutrons can vary for different isotopes of the same element.

mina [271]3 years ago

3 0

Answer:

Dalton's theory had to be modified after mass spectrometry experiments demonstrated that atoms of the same element can have different masses because the number of neutrons can vary for different isotopes of the same element

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Arrange the following units in decreasing order: nm,km,pm,Dm,mm,m,cm,hm,gm

goblinko [34]

The units are nm (nano-meter), km (kilo-meter), pm (pico-meter), dm (decimeter), mm (millimeter), m (meter), cm (centimeter), hm (hectometer) and gm (gigameter). Now we can express each of these units in terms of m.

1 nm = $10^{-9}m$ , 1 Km = $10^{3}m$ 1 pm = $10^{-12}m$ , 1 dm = 0.1 m, 1 mm = 0.001 m, 1 cm = 0.01 m, 1 hm = 100 m, 1 gm = $10^{9} m$ . Thus the decreasing unit will be

gm>km>hm>m>dm>cm>mm>nm>pm

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3 years ago

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alexgriva [62]

Answer: C. Some are metals and some are nonmetals.

Explanation:

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4 years ago

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As altitude increases, what is the trend in density of the air in the atmoshere

Finger [1]

The density will become less, this is because thing with less density float to the top when things with more density float to the bottom. It also becomes colder.

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3 years ago

a metal worker uses a cutting torch that operates by reacting acetylene gas, C2H2(g), with oxygen gas, O2(g), as shown in the un

harkovskaia [24]

Answer:

650 grams

Explanation:

Given that acetylene gas reacts with oxygen to produce caobon dioxide, water and heat and the unbalnced equation is

$C_2H_2(g)+O_2(g) \rightarrow CO_2(g) + H_2O(g)+ heat$