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LekaFEV [45]
3 years ago
8

How did Dalton describe the relationship between atoms and elements? An element is made up of one kind of atom. Atoms are made u

p of combinations of elements. Elements are made up of atoms arranged in whole-number ratios. Different kinds of atoms chemically combine to form elements.
Chemistry
2 answers:
victus00 [196]3 years ago
5 0

Answer: An element os made up of one kind of atom.

Explanation: Dalton's concept states that all atoms of an element is identical.

Sliva [168]3 years ago
4 0

Answer:

An element is made up of one kind of atom.

Explanation:

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A solid that forms and separates from a liquid mixture is a chemical change.

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If scientists want to determine if a skin cream is effective against fighting acne, what would be the independent variable?
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Answer:skin cream

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According to the following reaction, how many moles of oxygen gas are necessary to form 0.408 moles carbon dioxide?
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2 molecules of oxygen are necessary

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1 year ago
The white tern is a seabird that catches fish by plunging into the water. What physical features of the bird likely make this fe
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White tern catches fish including crustaceans, flying fish, squid, and others. Prior of plunging into water, it hovers initially over the water surface and then either dives or dips in the surface, without getting entirely submerged into water, and catches its target.  

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7 0
3 years ago
A common way of initiating certain chemical reactions with light involves the generation of free halogen atoms in solution. If Δ
IrinaVladis [17]

Answer:

493.02 nm is the longest wavelength of light that will produce free chlorine atoms in solution.

Explanation:

Cl_2(g)\rightarrow 2Cl(g) ,ΔH = 242.8 kJ/mol

Energy required to break 1 mole of Cl-Cl bond = 242.8 kJ

Energy required to break 1 Cl-Cl bond = E

E = \frac{242800 J}{6.022\times 10^{23}}=4.032\times 10^{-19} J

Energy related with the wavelength of light is given by Planck's equation:

E=\frac{hc}{\lambda }

\lambda =\frac{hc}{E}

=\frac{6.626\times 10^{-34} Js\times 3\times 10^8 m/s}{4.032\times 10^{-19} J}

\lambda = 4.930\times 10^{-7} m = 493.02 nm

1 m = 10^09 nm

493.02 nm is the longest wavelength of light that will produce free chlorine atoms in solution.

7 0
2 years ago
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