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777dan777 [17]
3 years ago
8

This unit discusses in detail the role of catalysts to lower the activation energy of reactions. The term catalyst appears in no

nscientific discussions to refer to something that provokes or speeds significant change or action. Consider this example from the 2006 Associated Press article "Chernobyl cover-up a catalyst for glasnost": "For the Soviet Union, Chernobyl was a catalyst that forced the government into an unprecedented show of openness that paved the way for reforms leading to the Soviet collapse." Discuss how this scientific term has made its way into common usage. Does the term carry the same meaning in regular usage? How is it used differently in a scientific context compared to a nonscientific context?
Chemistry
1 answer:
Naddik [55]3 years ago
7 0
Catalyst has found usage in non-scientific terms as an almost metaphorical word for something provokes or speeds up action or change. The word's applicability to many topics made it easy for it to find its way out of the scientific lexicon and into other domains, in this case political. 

Its meaning is roughly the same, in that a catalyst in this context is something that facilitated or sped up the process of glasnost.

One distinct meaning that I notice is that "catalyst" in more casual or non-scientific speech is that it is often used as a creator of action all its own, an actor in itself, rather than a facilitating agent to a reaction, as its scientific definition states. 
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How many dm3 of oxygen at STP would be required to react completely with 38.8g of propane? (3 marks)
11Alexandr11 [23.1K]

98.56 dm^3 of oxygen at STP would be required to react completely with 38.8g of propane.

<u>Given that :</u>

molar mass of propane = 44 g/mol

mass of propane = 38.8 g

∴ Moles present in 38.8 g of propane = \frac{38.8}{44} = 0.88 mole

<u>applying rule of balanced equations </u>

1 mole of propane = 5 moles of oxygen

0.88 mole of propane =  5 * 0.88 = 4.4 moles of oxygen

Note : volume of 1 mole of oxygen at STP = 22.4 dm^3

∴Total volume of oxygen required at STP = 22.4 * 4.4 = 98.56 dm^3

Hence we can conclude that the volume of oxygen at STP required to react completely 98.56 dm^3

Learn more : brainly.com/question/16998374

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2 years ago
Two students have been researching the atomic theory in preparation for their chemistry test. Melanie stated that Thomson's disc
fiasKO [112]

Answer:

Josue

Explanation:

J.J Thompson proposed the plum pudding model of the atom. In his proposition, the atom is a sphere of positive charges into which negative charges were embedded. This model of the atom did not significantly contribute to our present day understanding of atomic structure.

On the other hand Ernest Rutherford laid out the foundation for a more accurate understanding of atomic structure in his nuclear model of the atom. According to Rutherford, the atom consists of a positively charged massive core called the nucleus around which electron move in orbits. His idea was akin to the solar system with the sun at it's core and planets moving around the sun in orbits.

This his idea of the nuclear theory was held as fundamentally correct by Neils Bohr's model of the atom. Hence, his nuclear theory of the atom was a significant milestone in our present day understanding of atomic structure.

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3 years ago
How many moles of Magnesium Oxide are in 35g?
irga5000 [103]

Answer:

0.88mol

Explanation:

The number of moles, n, contained in a substance can be calculated using the formula;

Moles (n) = mass (m) ÷ molar mass (MM)

Molar mass of Magnesium oxide (MgO) = 24 + 16

= 40g/mol

According to the question, Mass of MgO = 35grams

Mole = 35/40

Mole = 0.875

Mole = 0.88mol

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Letter D.

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chubhunter [2.5K]

Answer:

Explanation:

The physical methods of separating mixtures are used in sorting a mixture of substances.

It requires no chemical changes occurring between their components and parts in any significant way.

Examples are:

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