Chemistry Unit 1 Quiz

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Questions and Answers

Chemistry studies only the composition of matter.

False

What is matter?

Anything that has mass and takes up space.

Which of the following is NOT a qualitative property?

Smell

Colour

Density (correct)

Taste

Give an example of a qualitative property that can be used to identify a substance?

Smell Signup and view all the answers

Which property describes the ability of a liquid to flow?

Viscosity Signup and view all the answers

What is a physical change?

A change in the state or form of a substance without creating a new substance. Signup and view all the answers

Physical changes cannot be reversed.

False Signup and view all the answers

Which of the following is an example of a chemical change?

Burning wood Signup and view all the answers

Name at least two clues that indicate a chemical change has occurred.

A new colour appears, heat or light given off. Signup and view all the answers

What is the formula for calculating density?

Mass / Volume Signup and view all the answers

The Particle Theory of Matter proposes that particles of matter are always static.

False Signup and view all the answers

According to the Particle Theory of Matter, how does temperature affect particle movement?

Particles move faster at higher temperatures Signup and view all the answers

A pure substance is a mixture of different elements.

False Signup and view all the answers

Give an example of a compound.

Water (H2O) Signup and view all the answers

Which of the following is NOT a type of mixture?

Compound Signup and view all the answers

What is the main difference between a mechanical mixture and a solution?

In a mechanical mixture, you can see different parts, while in a solution, the components blend evenly and you don't see individual parts. Signup and view all the answers

Salt dissolving in water is an example of a mechanical mixture.

False Signup and view all the answers

Give an example of a mechanical mixture.

A chocolate chip cookie Signup and view all the answers

Study Notes

Chemistry Unit 1

Chemistry is the study of matter and its changes.
Matter is anything that has mass and takes up space.

Physical Properties

Physical properties describe a substance and can help identify it.
Qualitative properties are observed using the senses (e.g., color, texture, odor, luster, clarity, taste).
Quantitative properties are measured and have numerical values (e.g., temperature, mass, volume, density, solubility, melting point, boiling point, hardness, crystal form).
Qualitative Properties:
- State: Solid, liquid, or gas
- Color: Black, white, colorless, etc.
- Texture: Fine, coarse, smooth, gritty, etc.
- Odor: Spicy, burnt, odourless, etc.
- Lustre: Shiny or dull
- Clarity: Clear, cloudy, opaque
- Taste: Sweet, sour, salty, bitter
Quantitative Properties:
- Malleability: Ability to be hammered or bent into shapes
- Ductility: Ability to be pulled into wires
- Melting Point: Temperature at which a solid melts
- Boiling Point: Temperature at which a liquid boils
- Hardness: Resistance to being scratched
- Crystal Form: Regular geometric pattern of the solid
- Solubility: Ability to dissolve in a solvent (e.g., water)
- Viscosity: Measure of a liquid's thickness or resistance to flow
- Density: Mass per unit volume

Physical Changes

Physical changes affect the form or state of a substance, but do not change its chemical composition.
Changes of states (solid, liquid, gas)
Examples: melting ice, dissolving sugar in water, chopping wood
Processes can be reversed (e.g., freezing water)

Changes of State

Freezing/Solidification: Liquid to solid
Melting/Liquefaction: Solid to liquid
Sublimation: Solid to gas
Evaporation: Liquid to gas
Condensation: Gas to liquid

Density

Density is calculated as mass divided by volume.
Formula: Density = mass/volume (D = m/v)

Chemical Properties

Chemical properties describe how a substance reacts or changes into a new substance.
Examples: Flammability, reactivity with acids, oxidation.
Combustibility is the ability of a substance or material to burn or ignite, producing heat and light.

Chemical Changes

Chemical changes result in the formation of new substances.
Five Clues a chemical change has occurred:
- A new color appears.
- Heat or light is given off.
- Bubbles or gas are formed.
- A solid material (precipitate) forms in a liquid.
- The change is non-reversible

Classifying matter

Matter can be classified into pure substances (elements and compounds) and mixtures (mechanical mixtures and solutions).
Elements: Pure substances that cannot be broken down into simpler substances.
Compounds: Pure substances formed by chemically combining two or more elements.
Mixtures: Combinations of two or more substances that are not chemically bonded.
- Mechanical Mixtures (heterogeneous): Mixtures whose components can be visibly identified.
- Solutions (homogeneous): Mixtures whose components are uniformly distributed.

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Description

Test your understanding of Chemistry Unit 1, which covers the fundamental concepts of matter and its physical properties. This quiz will assess your knowledge of qualitative and quantitative properties, helping to reinforce your learning in this essential science discipline.