2 years ago

How did the cathode ray tube contribute to the history of atomic structure?

1 answer:

3 0

J.J Thompson discovered the electron. He demonstrated that cathode rays were negatively charged. He then realized that the accepted model of an atom did not come out positive nor negative

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Please help!!! DUE IN 10 minutes

NARA [144]

Answer:

232.04

Explanation:

90 - atomic number

Th - element symbol

232.04 - atomic mass

4 0

2 years ago

Calculate the frequency (in Hertz) of light with a wavelength of 420 nm. What color is the light?

BabaBlast [244]

Speed of light is 3.0*10^8
frequency = wavelength / speed
= 1400 Hz

3 0

2 years ago

Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrog

goldfiish [28.3K]

Answer:

The structures are shown in the figure.

Explanation:

The primary hydrogens are those which are attached to primary carbon.

Primary carbons are the carbons which are attached to only one carbon.

Primary carbons is bonded to three hydrogens.

In order to draw such structure we will draw structures which will have carbon with three hydrogens or no hydrogens (quaternary)

The structures are shown in the figure with clear marking.

7 0

2 years ago

What is the overall cell potential for this redox reaction? Ca2+ + 2Li = Ca + 2Li+ Ca2+ + 2e- = Ca -2.87 V Li = Li+ + e- -3.05 V

Jet001 [13]

The redox reaction is

$Ca^{+2} + 2Li(s) = Ca(s) + 2Li^{+}$

Here

Calcium undergoes reduction, and acts as cathode

Lithium undergoes oxidation and acts as anode

The reduction potential of calcium is -2.87 V

The reduction potential of lithium is - -3.05 V

We know that

Ecell = Ecathode - Eanode

Ecell = -2.87 - (-3.05) = 0.18 V

4 0

3 years ago

a rock dropped in a graduated cylinder raises the level of water from 20 ml to 35 ml. the rock has mass of 45 g. what is the den

adelina 88 [10]

Answer:

15...

Explanation:

6 0

2 years ago