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Physical Science > Chemical Reactions > Flashcards

Chemical Reactions Flashcards

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1
Q

What is a physical change

A

A change where the molecules do not undergo any change

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2
Q

What is a chemical change

A

A change that results in the rearrangement of the atoms of the combining substances to form new substances

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3
Q

When does an exothermic reaction

A

When energy is released during a chemical reaction (the energy of the reactants is greater than the energy of the product.

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4
Q

What is an endothermic reaction

A

Energy is absorbed during a chemical reaction. (The energy of the reactants is less than the energy of the product)

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5
Q

What is a chemical reaction

A

A way to describe what happens during a chemical change

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6
Q

What is delta heat

A

Energy of products - energy of reactants

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7
Q

What is an electrolyte

A

A solution that contains ions and can conduct electricity

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8
Q

What does the conductivity of a substance depend on

A

The type of substance, the concentration of the ions in solution and the solubility of a certain substance

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9
Q

What are the three types of ion exchange reactions

A

Precipitation, gas forming and acid-base reactions

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10
Q

What is a precipitation reaction

A

When aqueous solutions of certain salts are mixed and an insoluble product (solid) suddenly forms in the mixture

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11
Q

What is a solution

A

A homogenous mixture of a solute and a solvent

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12
Q

What is a solute

A

The substance that is being dissolved in the solution

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13
Q

What is a solvent

A

The substance in which the solute is being dissolved to form a solution

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14
Q

What is a saturated solution

A

A chemical solution containing the maximum concentrations of a solute dissolved in the solvent

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15
Q

What is concentration

A

The amount of solute per unit volume of solution

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16
Q

What is a precipitate

A

The solid that forms in a solution during a chemical reaction

17
Q

What is suspension

A

A heterogeneous mixture of a solid suspended in a liquid

18
Q

What is hydration

A

Where ions become surrounded by water molecules in a water solution

19
Q

What dissolves in water

A

Ions and polar substances

20
Q

What’s the difference between dissociation and ionisation

A

Dissociation water is a solvent so it’s written above the arrow whereas ionisation water is a reactant to form ions in solution. And also dissociation occurs when with ionic compounds and ionisation occurs with polar covalent compounds

21
Q

What is an electrolyte

A

A solution that contains free moving ions

22
Q

What is a strong electrolyte

A

A substance whose aqueous solution is a good conductor.

23
Q

What are non electrolytes

A

Molecules because they do not dissolve in water

24
Q

What is % yield

A

The Measure of the extent of a reaction, generally measured by comparing the amount of product produced against the amount of product possible

Physical Science (29 decks)

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