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kolbaska11 [484]
3 years ago
13

Marine fossils have been found on Mt. Everest, which is the tallest mountain in the world. How does evidence of marine fossils p

rove that Earth has changed over time?(1 point)
Chemistry
2 answers:
Marina86 [1]3 years ago
7 0

Explanation:

;ewFim,jhbuikew d

Mama L [17]3 years ago
5 0

Answer:

C

Explanation:

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san4es73 [151]

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3.8x1024atoms Zn

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True or Fase. Every substance has to be classified as either acid or base?
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False

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The main purpose of _____ is to distribute blood throughout the body
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Cardiovascular system

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Determine the mass of CaCO3 required to produce 40.0 mL CO2 at STP. Hint use molar volume of an ideal gas (22.4 L)
cupoosta [38]

Answer:

m_{CaCO_3}=0.179gCaCO_3

Explanation:

Hello,

In this case, since the undergoing chemical reaction is:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

The corresponding moles of carbon dioxide occupying 40.0 mL (0.0400 L) are computed by using the ideal gas equation at 273.15 K and 1.00 atm (STP) as follows:

PV=nRT\\\\n=\frac{PV}{RT}=\frac{1.00 atm*0.0400L}{0.082\frac{atm*L}{mol*K}*273.15 K})=1.79x10^{-3} mol CO_2

Then, since the mole ratio between carbon dioxide and calcium carbonate is 1:1 and the molar mass of the reactant is 100 g/mol, the mass that yields such volume turns out:

m_{CaCO_3}=1.79x10^{-3}molCO_2*\frac{1molCaCO_3}{1molCO_2} *\frac{100g CaCO_3}{1molCaCO_3}\\ \\m_{CaCO_3}=0.179gCaCO_3

Regards.

3 0
4 years ago
Which of the following describe chemical properties
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Chemical properties are all those properties that are shown when the chemical is a part of a reaction or is changed in any way. Unlike physical properties, they affect the composition of the chemical and the way it behaves, while physical does not change the chemical itself. Such properties are toxicity, flammability, reaction with other elements, stability, and many more.
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3 years ago
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