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vlabodo [156]
3 years ago
13

How did Democritus help our understanding of the atom?

Chemistry
1 answer:
Elza [17]3 years ago
4 0
He discovered the atom while standing on a beach talking. Although, he thought the atom was like a ping pong ball.
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How do you calculate the density of a gas, based on its temperature and pressure?
stiks02 [169]
We can rearrange the ideal gas equation:
PV = nRT, where n is the number of moles equivalent to:
n = mass / Mr
PV = mRT/Mr
m/V = PMr/RT
density = PMr / RT; where Mr and R are constant.
5 0
3 years ago
True or False. Index Fossils are formed from organisms that were alive for short period of geologic time, are extinct, had hard
NemiM [27]

Answer:

Index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment.

Explanation:

True

6 0
2 years ago
Read 2 more answers
Be sure to answer all parts. A concentration cell consists of two Sn/Sn2+ half-cells. The electrolyte in compartment A is 0.23 M
kolbaska11 [484]

Answer:

Part A. The half-cell B is the cathode and the half-cell A is the anode

Part B. 0.017V

Explanation:

Part A

The electrons must go from the anode to the cathode. At the anode oxidation takes place, and at the cathode a reduction, so the flow of electrons must go from the less concentrated solution to the most one (at oxidation the concentration intends to increase, and at the reduction, the concentration intends to decrease).

So, the half-cell B is the cathode and the half-cell A is the anode.

Part B

By the Nersnt equation:

E°cell = E° - (0.0592/n)*log[anode]/[cathode]

Where n is the number of electrons being changed in the reaction, in this case, n = 2 (Sn goes from S⁺²). Because the half-reactions are the same, the reduction potential of the anode is equal to the cathode, and E° = 0 V.

E°cell = 0 - (0.0592/2)*log(0.23/0.87)

E°cell = 0.017V

3 0
3 years ago
Some species of hares are brown most of the year, but change color to white in the winter. This allows them to blend in
muminat

Answer:

Deciduous forests

Explanation:

7 0
2 years ago
Adding sugar to your tea physical or chemical change ​
ExtremeBDS [4]

Answer:

physical

Explanation:

no chemical reaction occurs

6 0
3 years ago
Read 2 more answers
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