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3 years ago

When do scientists use models i will mark best one brainlest

2 answers:

4 0

They use models when they are trying to find stuff in the ground like fossils so they match them up so they can find if it’s the same or not please mark brainliest must appreciated !

aliina [53]3 years ago

3 0

Scientists use models when doing research to lay out their data. They can also use them to explore phenomena that are too vast complex or to dangerous to study first hand. They use it to investigate objects or processes that happen too slowly to quickly or on to small of a scale to observe directly

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12. What is the empirical formula for C10H30O5?

kramer

Answer:

Just use a text book.. So that you get the concept

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3 years ago

Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an el

Dovator [93]

Answer: 406 hours

Explanation:

$Q=I\times t$

where Q= quantity of electricity in coloumbs

I = current in amperes = 39.5 A

t= time in seconds = ?

The deposition of copper at cathode is represented by:

$Cu^{2+}+2e^-\rightarrow Cu$

$96500\times 2=193000$ Coloumb of electricity deposits 1 mole of copper

i.e. 63.5 g of copper is deposited by = 193000 Coloumb

Thus 19.0 kg or 19000 g of copper is deposited by = $\frac{193000}{63.5}\times 19000=57748032$ Coloumb

$57748032=39.5\times t$

$t=1461975sec=406hours$ (1hour=3600s)

Thus it will take 406 hours to plate 19.0 kg of copper onto the cathode if the current passed through the cell is held constant at 39.5 A

3 0

3 years ago

A liquid that evaporates at a slow rate exhibits __________.

Marizza181 [45]

Strong internolecurar forces (A) hope it helps

3 0

3 years ago

What term is used when heat is transferred from one piece of matter to another until they are of equal temperature?

IgorC [24]

thermal contact

When heat flows from one object or substance to another it is in contact with, the objects or substances are said to be in thermal contact. The state where objects in thermal contact with each other reach the same temperature, no heat flows between them.

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2 years ago

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas

nataly862011 [7]

57.1g * 6.022*10^23 / 22.9 * 2 = 7.51*10^23 molecules

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3 years ago