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devlian [24]
3 years ago
5

The nearest star to the earth is Proxima Centuri. It is 4x1016 meters from New York City. The distance to Perth on the exact

Chemistry
1 answer:
Travka [436]3 years ago
3 0

Answer:

Proxima Centuri is 9 orders of magnitude further from New York compared to Perth

Explanation:

Distance of Proxima Centuri to New York = 4 × 10^16 meters

Distance of Proxima Centuri to Perth = 11000 miles

Since 1 mile = 1609 meters, distance to Perth in meters = 11000 × 1609

Distance to Perth = 17699000 = 1.7699 × 10^7 meters

Order of magnitude of the distances of Proxima Centuri to New York and Perth = 10^16/10^7

Order of magnitude = 10^9

Therefore, Proxima Centuri is 9 orders of magnitude further from New York compared to Perth.

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Ksenya-84 [330]
The theory of plate tectonics tells exactly where the continents were before Pangaea divided.

I'm not a 100% sure but I feel strong about is
8 0
3 years ago
How many silicon atoms are in a 50.0 gram sample of silicon?
____ [38]

Answer:

7.505

×

10

22

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Explanation:

4 0
4 years ago
A sample of natural rubber (200.0 g) is vulcanized, with the complete consumption of 4.8 g of sulfur. Natural rubber is a polyme
nasty-shy [4]

Answer: 1.3% many crosslinks as isoprene units,  

Explanation:

Given:

mass pf natural rubber= 200.0g

mass of sulphur = 4.8g

molar mass of sulphur =32g/mol

molar mass of isoprene = C5H8=( 12x5) +(1x8)= 68g/mol

Solution: we first find no of moles present in each  using

no of moles = \frac{mass}{molarmass}

Isoprene: 200.0g x [1mole / 68g] = 2.94moles.

Sulfur: 4.8g x [1mole / 32g] x [1 mole crosslinks / 4 moles S] = 0.0375 moles crosslinks.

to find % crosslinked units, we have  

0.0375 / 2.94 = 1.3% as many crosslinks as isoprene units,  

3 0
3 years ago
Why might a bright yellow solid form when two clear colorless are mixed
Sergio [31]
This is a chemical reaction because a precipitate (solid) was formed from 2 liquids, and there was a color change as well
5 0
3 years ago
Wich diagram correctly represents the mass of one chemical reactions
avanturin [10]

Answer:

According to the law of conservation of mass, the mass of the reacting substances is equal to the mass of the product formed during a reaction.

Explanation:

6 0
3 years ago
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