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2 years ago

Please help I tired of doing this

Chemistry

2 answers:

algol [13]2 years ago

7 0

Answer:

uhh

Explanation:

Wegener found similar evidence when he discovered tropical plant fossils in the frozen region of the Arctic Circle. As Wegener collected more data, he realized the explanation that best fit all the climate, rock, and fossil observations involved moving continents.

Nuetrik [128]2 years ago

3 0

It’s B! … B mine… *WINK WINK* ;)

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3 years ago

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A 4.00g sample of helium has a volume of 24.4L at a temperature of 25.0oC and a pressure of 1.00 atm. The volume of the helium i

Masteriza [31]

Answer:

0.41 moles.

Explanation:

Given that:

Mass of helium = 4.00 g

Initial Volume = 24.4 L

initial Temperature = 25.0 °C =( 25 + 273) = 298 K

initial Pressure = 1.00 atm

The volume was reduced to :

i.e

final volume of the helium - 10.4 L

Change in ΔV = 24.4 - 10.4 = 10.0 L

Temperature and pressure remains constant.

The new quantity of gas can be calculated by using the ideal gas equation.

PV = nRT

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n = $\frac{1.00*10.0}{0.082057*298}$

n = 0.4089 moles

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2 years ago

What is a property of a substance?

S_A_V [24]

Answer:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.

Explanation:

Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

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2 years ago

The density of ethanol is 0.789 g/mL. If you need 460.0 g of ethanol for an experiment, how many milliliters would you measure o

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Answer:

The volume is 583.02 mL

Explanation:

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