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3 years ago

1. Discuss briefly system and surrounding using suitable examples, highlighting heat transfers. 14 marks

Chemistry

1 answer:

lisabon 2012 [21]3 years ago

3 0

A system is a part of the <em>physical</em> universe defined <em>arbitrarily</em> for observation purposes.

Boundaries are a part of the <em>physical</em> universe that are around the system.

In a scientific sense, a system is a part of the <em>physical</em> universe whose boundaries, that is, the limit between the system and its surroundings, are defined <em>arbitrarily</em> for observation purposes.

A system contains at least a model, represented in a phenomenological way, and it can be isolated (no mass nor energy interactions), closed (no mass interactions) or open.

The surroundings are a part of the <em>physical</em> universe that are around the system.

An example is a coffee-maker, where coffee-maker the system and air represents the surroundings, the coffee-maker receives energy from a heat source to warm up itself and releases part of such energy to the air.

We kindly invite to check this question on systems and surroundings: brainly.com/question/6044762

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What do the little numbers (subscripts) next to the lower right of each letter mean in the C₂H₄O₂?

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It represents the <em>number of atoms</em> of that particular element present in the compound. In C₂H₄O₂ there are 2 Carbon atoms, 4 Hydrogen atoms and 2 Oxygen atoms.

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2 years ago

As temperature increase and the volume stays constant, how will the pressure change

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Answer:

There will be more collisions and so a greater pressure. The number of particles is proportional to pressure, if the volume of the container and the temperature remain constant. ... Volume is inversely proportional to pressure, if the number of particles and the temperature are constant.

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3 years ago

3) In the reaction below, how many grams of carbon dioxide are produced when iron III

Yanka [14]

<h3>Answer:</h3>

132.03 g

<h3>Explanation:</h3>

<u>We are given;</u>

The equation for the reaction as;

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Molar masses of CO and CO₂ as 28.01 g/mol and 44.01 g/mol respectively
Mass of CO as 84 grams

We are required to calculate the mass of CO₂ that will produced.

<h3>Step 1: Calculate the number of moles of CO</h3>

Moles = Mass ÷ Molar mass

Molar mass of CO = 28.01 g/mol

Therefore;

Moles of CO = 84 g ÷ 28.01 g/mol

= 2.9989 moles

= 3.0 moles

<h3>Step 2: Calculate the number of moles of CO₂</h3>

From the reaction, 3 moles of CO reacts to produce 3 moles of CO₂

Therefore; the mole ratio of CO to CO₂ is 1 : 1
Hence; Moles of CO = Moles of CO₂

Moles of CO₂ = 3.0 Moles

But; mass = Moles × molar mass

Thus, mass of CO₂ = 3.0 moles × 44.01 g/mol

= 132.03 g

Hence, the mass of CO₂ produced from the reaction is 132.03 g

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4 years ago

Which kind of material would best accomplish this task ?

timofeeve [1]

What's the question ?

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3 years ago

Read 2 more answers

The number of B2H6 molecules

zlopas [31]

Answer:

6.022 × 10²³ molecules of B₂H₆

Explanation:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

B₂H₆ molecules:

21.63 g = one mole of B₂H₆= 6.022 × 10²³ molecules of B₂H₆

8 0

3 years ago

1. Discuss briefly system and surrounding using suitable examples, highlighting heat transfers. 14 marks​

1. Discuss briefly system and surrounding using suitable examples, highlighting heat transfers. 14 marks