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irakobra [83]
3 years ago
8

An extremely vesicular volcanic rock of rhyolite composition is called

Chemistry
1 answer:
mamaluj [8]3 years ago
6 0

Answer:

b. pumice

Explanation:

Vesicular texture of rock means the rock has many cavities in all the layers of the rock. Pumice is a soft rock which is the powdered form of volcanic rock which has vesicular texture.

The composition of the pumice rock is commonly formed of silica or felsic. They can be rhyolitic, dacitic, andesite, pantellerite, phonolite, trachyte in composition.

Hence, the rock being described here is pumice.

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IS THIS A BALANCED EQUATION <br> MgCl2 + Na2O -- &gt; MgO + 2 NaCl
Dmitriy789 [7]
Yes, this is balanced. Each part of the substance (like Mg) has the same number on both sides.

Hope this helps you:)
8 0
3 years ago
Acetic acid has a pKa of 4.74. Buffer A: 0.10 M HC2H3O2, 0.10 M NaC2H3O2 Buffer B: 0.30 M HC2H3O2, 0.30 M NaC2H3O2 Buffer C: 0.5
e-lub [12.9K]

Answer:

Buffer B has the highest buffer capacity.

Buffer C has the lowest buffer capacity.

Explanation:

An effective weak acid-conjugate base buffer should have pH equal to pK_{a} of the weak acid. For buffers with the same pH, higher the concentrations of the components in a buffer, higher will the buffer capacity.

Acetic acid is a weak acid and CH_{3}COO^{-} is the conjugate base So, all the given buffers are weak acid-conjugate base buffers. The pH of these buffers are expressed as (Henderson-Hasselbalch):

pH=pK_{a}(CH_{3}COOH)+log\frac{[CH_{3}COO^{-}]}{[CH_{3}COOH]}

pK_{a}(CH_{3}COOH)=4.74

Buffer A:    pH=4.74+log(\frac{0.10}{0.10})=4.74

Buffer B:   pH=4.74+log(\frac{0.30}{0.30})=4.74

Buffer C:   pH=4.74+log(\frac{0.10}{0.50})=4.04

So, both buffer A and buffer B has same pH value which is also equal to pK_{a} . Buffer B has higher concentrations of the components as compared to buffer A, Hence, buffer B has the highest buffer capacity.

The pH of buffer C is far away from pK_{a} . Therefore, buffer C has the lowest buffer capacity.

     

6 0
3 years ago
The balanced half-reaction in which sulfate ion is reduced to sulfite ion is a __________ process.
harkovskaia [24]

Answer:

Two-electron

Explanation:

8 0
3 years ago
20 points! &lt; is what I chose. How did I do?
Zigmanuir [339]

Greenhouse gases released from the burning of fossil fuels are responsible for global warming.

<h3>What is the atmosphere?</h3>

The atmosphere is the region of region of the planet above its surface area where gases envelop the planet.

Based on the effect of greenhouse gases on global warming;

  • Planet A has a higher surface temperature due to the higher amount of carbon dioxide in the atmosphere since carbon dioxide is a greenhouse gas.
  • Methane is the main constituent of natural gas. Humans increase the contribute to increase in methane gas by raising cattle,
  • Pollutants come from both natural sources and human activities.
  • Sulfur Dioxide is produced by the combustion of fuels in automobiles. Once in the atmosphere, it combine with water to form acid precipitation.
  • Nitrogen and oxygen do not contribute to the greenhouse effect because they are  made up of 2 atom molecules that are bound tightly so they CANNOT vibrate to absorb energy.
  • Greenhouse gases contribute to global warming by absorbing infrared energy that reflects off Earth's surface and reemitting the energy in all directions. This keeps the infrared energy close to the Earth's surface.
  • Most of the greenhouse gases produced come from burning fossil fuels in factories, ships, cars, trains.

Therefore, pollutants such as greenhouse gases are responsible for global warming.

Learn more about greenhouse gases at: brainly.com/question/12684997

#SPJ1

8 0
1 year ago
Jasper made a list of the properties of electromagnetic waves. Identify the mistake in the list.
ch4aika [34]

Answer:

B. Line 2 has a mistake

Explanation:

1. All electromagnetic waves are made of both electric and magnetic fields (hence the name electromagnetic).

2. All electromagnetic waves are transverse, and not longitudinal.

3. All electromagnetic waves can travel through space because they do not need particles to travel (like sound waves).

4. Electromagnetic waves all travel at the speed of light (299 792 458 m/s).

3 0
3 years ago
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