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horrorfan [7]
3 years ago
13

At the end of the Paleozoic Era, ____ covered the Earth. This allowed reptiles to flourish and spread across Earth.

Chemistry
1 answer:
Dafna11 [192]3 years ago
8 0

Answer:

1. grasslands

Explanation: hope this helps :)

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A sample of nitrogen gas is stored in a 592.2 mL flask at 108 kPa and 10.0°C. The gas is transferred to a 750.0 mL flask at 28.9
vfiekz [6]
According to Gases law, we know, 
PV/T = Constant

So, P₁V₁/T₁ = P₂V₂/T₂

Here, P₁ = 108 kPa
V₁ = 592.2 mL
T₁ = 10+273 = 283 K
P₂ = ?
V₂ = 750 mL
T₂ = 28.9+273 = 301.9

Substitute their values, 

108 * 592.2 / 283 = P₂ * 750 / 301.9
P₂ = 63957.6 * 301.9 / 283 * 750
P₂ = 19308799.44 / 212250
P₂ = 90.97 kPa

In short, Your Final Answer would be: 90.97 kPa

Hope this helps!
8 0
3 years ago
What is the main difference between a chemical and a physical change? PLEASE HELP ASAP
harina [27]

Answer:

In a chemical change the nature of the substance changes and it is transformed, for example when a piece of wood is burned, the carbon is being transformed into carbon dioxide. A physical change is one where the nature of matter does not vary.

I hpoe help you.

4 0
3 years ago
Read 2 more answers
PLZ HELP (SCIENCE) Match the following items.
FromTheMoon [43]
Oxidation: a chemical change resulting form a reaction with oxygen
Endothermic:a reaction that takes in energy
Exothermic: a reaction that releases energy
Decomposition:chemical change whereby a molecule breaks down into simpler moles clues or elements
Subscript:written underneath or below
6 0
2 years ago
Read 2 more answers
A container holds 6. 4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.
ipn [44]

In a mixture of gases, the total pressure is equivalent to the aggregate of all the partial pressures of the single element of the gas.

It can be written as \rm P _{total} = P₁ + P₂ +  P₃ and so on.

The partial pressure will be:

Option A. 0. 31 atm

Pressure can be estimated by:

<u>PV = nRT</u>

\rm P_{total} = \dfrac{n _{total }RT}{ V}

\rm P_{total} = \dfrac{n _{H_{2}} + n _{\rm other \;gases}}{ V}

Where,

\rm nH_{2} = 25\% \times n_{Total}

And,

\begin{aligned}\rm P_{H_{2}} &= 25\% \times \rm P_{Total}\\\\& = 25\% \times 1.24 \;\rm atm\\\\& = 1.24 \rm \;atm \times 25 \end{aligned}

Solving finally we get,

\rm  P_{H_{2}} = 0.31 \;\rm atm

Therefore, 0.31 atm is the partial pressure of the hydrogen gas.

To learn more about partial pressure follow the link:

brainly.com/question/1471705

3 0
2 years ago
Using the following equation
Valentin [98]
Thermal energy when solid, liquor , and gas combine
7 0
3 years ago
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