Matter Classification Quiz

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Questions and Answers

What defines a compound?

  • A mixture of substances that can be separated physically.
  • Atoms combined chemically in fixed proportions by mass. (correct)
  • Two or more substances in a non-uniform arrangement.
  • A solution where components are indistinguishable.

Which of the following correctly represents the chemical formula for water?

  • H<sub>2</sub>O<sub>2</sub>
  • O<sub>2</sub>H
  • H<sub>2</sub>O (correct)
  • HO

What is a characteristic of a homogeneous mixture?

  • Component parts can be distinguished easily.
  • Contains elements in different states.
  • Properties and composition are uniform throughout. (correct)
  • It has fixed proportions by mass.

Which of the following is an example of a heterogeneous mixture?

<p>Salt and sand (D)</p> Signup and view all the answers

What distinguishes a solution from a suspension?

<p>A solution has components that cannot be separated physically. (A)</p> Signup and view all the answers

Which of the following is a characteristic of a colloid?

<p>It is a homogeneous mixture. (C)</p> Signup and view all the answers

What term is used to describe the major component of a solution?

<p>Solvent (B)</p> Signup and view all the answers

Which of these processes can be used to separate mixtures?

<p>Filtration (C)</p> Signup and view all the answers

Which of the following is an example of a colloid?

<p>Smoke in air (D)</p> Signup and view all the answers

What is a saturated solution?

<p>A solution that contains undissolved solute at a specific temperature (A)</p> Signup and view all the answers

Which statement about suspensions is true?

<p>Particles in a suspension settle over time. (C)</p> Signup and view all the answers

Which of the following is NOT a component of a colloid?

<p>Liquid dispersed in a solid (C)</p> Signup and view all the answers

How is solubility defined?

<p>The maximum amount of solute that can dissolve in a given solvent at a specified temperature (A)</p> Signup and view all the answers

Which mixture is considered a homogeneous solution?

<p>Brass (C)</p> Signup and view all the answers

What differentiates a colloid from a solution?

<p>Solutions exhibit no Tyndall effect, while colloids do. (C)</p> Signup and view all the answers

Which of the following mixtures is an example of a suspension?

<p>Dust in air (A)</p> Signup and view all the answers

What happens to a solution when more solute is added after it has reached its saturation point?

<p>The solute remains in solid form. (D)</p> Signup and view all the answers

How is solubility typically measured?

<p>As a mass of solute that saturates 100 g of water. (A)</p> Signup and view all the answers

What effect does increasing temperature have on the solubility of most solid solutes in water?

<p>Solubility increases. (C)</p> Signup and view all the answers

When a saturated solution is cooled, what occurs?

<p>The solute forms crystals. (C)</p> Signup and view all the answers

What is the primary factor affecting the solubility of a solute in a solvent?

<p>The structure of the solute and solvent. (B)</p> Signup and view all the answers

Why is it easier to measure 100 cm³ of water than 100 g of water in the laboratory?

<p>Water can be measured by volume easily due to its density. (B)</p> Signup and view all the answers

What does a solubility curve display?

<p>The solubility of a solute against temperature. (B)</p> Signup and view all the answers

Which of the following is a practical application of separating mixtures?

<p>Purifying drinking water. (B)</p> Signup and view all the answers

Which separation method is best for a mixture of a solid and a liquid where the solid does not dissolve in the liquid?

<p>Filtration (C)</p> Signup and view all the answers

In which scenario would simple distillation be the most appropriate method of separation?

<p>Separating a dissolved solid from a liquid (B)</p> Signup and view all the answers

What physical property allows fractional distillation to effectively separate two miscible liquids?

<p>Boiling point (D)</p> Signup and view all the answers

Which separation technique uses filter paper to separate components?

<p>Filtration (A)</p> Signup and view all the answers

What is the main principle behind chromatography as a method of separation?

<p>Solubility and attraction (A)</p> Signup and view all the answers

Which separation method is used for a mixture of two immiscible liquids with different densities?

<p>Separating funnel (C)</p> Signup and view all the answers

What is the main physical property used in evaporation and crystallisation to separate components?

<p>Boiling point (A)</p> Signup and view all the answers

When is chromatography particularly useful in separating substances?

<p>When separating dissolved substances (B)</p> Signup and view all the answers

What is the primary purpose of the Liebig condenser in the distillation process?

<p>To cool and condense the vapor back into liquid (A)</p> Signup and view all the answers

Which of the following best describes fractional distillation?

<p>It separates miscible liquids with closer boiling points through repeated vaporization (A)</p> Signup and view all the answers

What is the role of the fractionating column in fractional distillation?

<p>To provide a surface for repeated condensation and vaporization (A)</p> Signup and view all the answers

How does the concentration of the solution in the distillation flask change during the distillation process?

<p>It gradually increases as most of the liquid vaporizes (D)</p> Signup and view all the answers

What type of liquids can be separated using a separating funnel?

<p>Immiscible liquids with different densities (A)</p> Signup and view all the answers

In fractional distillation of ethanol and water, what happens to the vapor of water?

<p>It remains in the fractionating column and returns to the flask (B)</p> Signup and view all the answers

Which of the following statements about miscible liquids is true?

<p>They mix uniformly in any proportion (C)</p> Signup and view all the answers

What happens to the impurity levels in the distillation flask as the process continues?

<p>They decrease significantly with each collection of distillate (D)</p> Signup and view all the answers

What primary substance is produced when sugar cane stalks are crushed?

<p>Cane juice (B)</p> Signup and view all the answers

What is the purpose of adding calcium hydroxide to the cane juice during the clarification process?

<p>To neutralize acids (D)</p> Signup and view all the answers

During the evaporation process, how does the juice avoid caramelization?

<p>By applying vacuum distillation (B)</p> Signup and view all the answers

What is the main result of the crystallization process in the production of sugar?

<p>Formation of sugar crystals (C)</p> Signup and view all the answers

What is the output of the centrifuge operation in the sugar production process?

<p>Molasses and unrefined sugar (C)</p> Signup and view all the answers

What creates the initial nuclei for sugar crystal formation during crystallization?

<p>Seeds of sugar (D)</p> Signup and view all the answers

Which product is formed when the syrup becomes too viscous during crystallization?

<p>Massecuite (C)</p> Signup and view all the answers

What happens to the factory mud generated during the filtration process?

<p>It is used as fertilizer. (B)</p> Signup and view all the answers

Flashcards

Compounds

Substances formed when two or more different elements combine chemically in fixed proportions by mass.

Chemical Formula

A shorthand representation of a compound, showing the types and numbers of atoms of each element in the compound.

Mixtures

Combinations of two or more substances not chemically bonded, whose proportions can vary.

Homogeneous Mixtures

Mixtures with uniform properties and composition throughout.

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Heterogeneous Mixtures

Mixtures with non-uniform properties and composition, where different parts are visible.

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Solutions

Homogeneous mixtures where one substance (solute) dissolves in another (solvent).

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Solvent

The component of a solution that dissolves the other substance (solute).

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Solute

The component of a solution that gets dissolved by the solvent.

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Solute

The substance that dissolves in a solution.

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Solvent

The substance that dissolves the solute in a solution.

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Saturated Solution

A solution containing the maximum amount of solute that can dissolve at a specific temperature.

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Suspension

A heterogeneous mixture with visible particles that settle out over time.

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Colloid

A heterogeneous mixture with particles that are intermediate in size between solutions and suspensions.

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Solubility

The amount of solute that can dissolve in a given amount of solvent at a specific temperature.

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Solution

A homogeneous mixture of a solute and a solvent.

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Heterogeneous Mixture

A mixture with visibly different components that can be separated.

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Solubility

The mass of solute that can dissolve in a given mass of solvent at a specific temperature to form a saturated solution.

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Saturated Solution

A solution in which no more solute can dissolve at a given temperature.

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Solubility of a solute

Amount of solute dissolved in 100g of solvent at a specific temperature

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Effect of temperature on solubility

For most solid solutes in water, its solubility increases with temperature.

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Solubility curve

A graph showing the relationship between a substance's solubility and temperature.

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Solubility of Potassium Chlorate (KCl3)

The amount of potassium chlorate that can dissolve in 100 g of water at a specific temperature and is shown on a solubility curve (increases with temp.).

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Separating mixtures

Different methods are used to separate mixtures into their components.

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Density of water (1 g/cm³)

1 cm³ of water has a mass of 1 gram, crucial for measuring and determining solubility.

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Filtration

Separating a solid from a liquid by passing the mixture through a filter.

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Suspension

A mixture where a solid is not dissolved in a liquid.

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Evaporation

Separating a dissolved solid from a liquid by heating to vaporize the liquid.

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Crystallisation

The process of separating a dissolved solid from a liquid by using the different boiling points.

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Distillation

Separating liquids with different boiling points.

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Fractional distillation

Separating liquids with similar but different boiling points.

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Separating funnel

Separating immiscible liquids based on density differences.

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Chromatography

Separating dissolved substances based on their solubility and attraction to a medium.

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Simple Distillation

A method to separate liquids with significantly different boiling points by heating the mixture, collecting the vapor as it condenses.

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Fractional Distillation

Separates liquids with close boiling points by repeated vaporization and condensation in a fractionating column.

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Miscible Liquids

Liquids that can mix together in any proportion.

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Immiscible liquids

Liquids that do not mix together.

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Separating Funnel

Used to separate immiscible liquids based on their different densities.

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Fractionating Column

Part of fractional distillation apparatus which has many plates to increase vapor-liquid interactions causing gradual separation.

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Distillate

The purified liquid collected after condensation in distillation process.

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Boiling Point

The temperature at which a liquid turns into a gas.

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Sugar Cane Processing

A multi-step process to extract sugar from sugar cane stalks.

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Cane Juice Clarification

Removing impurities from cane juice using calcium hydroxide to neutralize acids and cause precipitation.

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Evaporator

A series of boilers that concentrate cane juice by eliminating water via vacuum distillation.

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Crystallization

Creating sugar crystals from concentrated cane juice when it surpasses saturation.

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Massecuite

A mixture of sugar crystals and molasses created in the crystallizer.

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Centrifugation

Separating sugar crystals from molasses using high-speed spinning.

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Unrefined Sugar Drying

Removing moisture from damp sugar crystals using heated air.

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Bagasse

The solid fibrous residue remaining after sugar extraction from the sugarcane.

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Study Notes

Matter Classification

  • Matter is classified into pure substances and mixtures.
  • Pure substances have a fixed, constant composition.
  • Pure substances' properties are fixed and constant.
  • Component parts of pure substances cannot be separated by physical means.
  • Mixtures have a variable composition.
  • Mixture properties vary since components retain individual properties.
  • Mixture components can be separated by physical means.

Pure Substances

  • Pure substances are classified into elements and compounds.

Elements

  • Elements are the simplest form of matter.
  • Elements cannot be broken down into simpler parts by ordinary chemical or physical means (excluding nuclear reactions).
  • The smallest particle having the same properties as the element is an atom.
  • Each element is composed of only one kind of atom.

Compounds

  • Compounds are composed of more than one kind of atom.
  • Atoms in compounds are chemically combined in fixed proportions by mass.
  • Compounds cannot be separated into their components by physical means.
  • Compound properties differ from the properties of their constituent elements.

Mixtures

  • Mixtures consist of two or more substances.
  • Substances in mixtures are physically combined.
  • Proportions of substances in mixtures vary.
  • Mixture components retain their own properties.

Homogeneous Mixtures

  • Homogeneous mixtures have uniform properties throughout.
  • Component parts cannot be distinguished.
  • Solutions are examples of homogeneous mixtures.

Heterogeneous Mixtures

  • Heterogeneous mixtures are non-uniform.
  • Component parts can be distinguished.
  • Suspensions and colloids are examples of heterogeneous mixtures.

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