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atroni [7]
4 years ago
14

Classify each statement about catalysts as true or false.Catalysts lower activation energyCatalysts are consumed by the overall

reactionCatalyst speed up the chemical reactions
Chemistry
1 answer:
avanturin [10]4 years ago
8 0

Answer:

\boxed{\text{True; False; True}}

Explanation:

Catalysts lower activation energy. TRUE.  

They provide an alternate pathway with a lower activation energy.

Catalysts are consumed by the overall reaction. FALSE.

They take part in the reaction, but they can be recovered unchanged at the end.

Catalysts speed up the chemical reactions. TRUE.

If the activation energy is lowered, a greater percentage of the molecules will have enough energy to get over the energy barrier.

Its like lowering the high-bar in a track and field meet. The lower the bar, the more athletes will be able to get over it.

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Doing which of the following generally increases entropy of a substance
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The representatives anticipated that the Declaration of Rights and Grievances would lead to:
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a war with Britain

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Read 2 more answers
How many molecules of sodium oxide will be created if 275 grams of sodium reacts with excess oxygen?
DaniilM [7]

Answer:

  • <em>1.34 × 10²⁴ molecules</em>

Explanation:

To calculate the <em>number of molecules of sodium oxide that will be created if 275 grams of sodium reacts with excess oxygen</em>, use the chemical equation to calculate the number of moles and then multiply by Avogadro's number.

<u>1) Balanced chemical equation (given):</u>

  • 4Na + O₂ → 2Na₂O

<u>2) Mole ratio:</u>

  • 4 mol Na : 2 mol Na₂O

<u>3) Calculate the number of moles in 275 g  of Na:</u>

  • n = mass in grams / molar mass
  • mass of Na = 275 g
  • molar mass of Na₂O = 61.9789 g/mol

  • n = 275 g / 61.9789 g/mol = 4.437 mol of Na

<u>4) Set a proportion to find the number of moles of product (Na₂O):</u>

  • 2 mol Na₂O / 4 mol Na = x / 4.437 mol Na

  • x = 4.437 /  2 mol Na₂O = 2.2185 mol Na₂O

<u>5) Convert the number of moles to number of molecules:</u>

  • # molecules = n × 6.022 × 10²³ molecules/mol = 2.2185 mol × 6.022 × 10²³ molecules/mol = 1.34 × 10²⁴ molecules (rounded to 3 significant figures).
6 0
4 years ago
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