Chemical vs Physical Changes Quiz
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Questions and Answers

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

  • Melting ice
  • Burning wood (correct)
  • Crushing a can
  • Dissolving sugar in water

Physical changes always involve the formation of new substances.

True (A)

What is oxidation?

A chemical reaction involving oxygen that forms a new product.

The process of a fuel reacting with oxygen to produce heat and light is known as __________.

<p>combustion</p> Signup and view all the answers

Match the following processes with their corresponding type of change:

<p>Melting ice = Physical change Rusting of iron = Chemical change Cooking an egg = Chemical change Crushing a can = Physical change</p> Signup and view all the answers

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

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

Combustion reactions do not require oxygen to take place.

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

What is the difference between physical and chemical properties?

<p>Physical properties can be observed without changing the substance, while chemical properties describe a substance's ability to undergo chemical reactions.</p> Signup and view all the answers

The process where food is _______ can be categorized as a physical change.

<p>cooked</p> Signup and view all the answers

Match the following properties with their corresponding examples:

<p>Melting Point = Ice to water Flammability = Burning of gasoline Solubility = Salt dissolving in water Tendency to Rust = Iron exposed to moisture</p> Signup and view all the answers

What happens during a combustion reaction?

<p>A fuel reacts with oxygen, producing heat and light energy. (C)</p> Signup and view all the answers

Rusting is an example of reduction.

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

What are the three components needed for combustion according to the combustion triangle?

<p>Air/Oxygen, Fuel, Heat</p> Signup and view all the answers

Fuel + oxygen → __________ + __________.

<p>carbon dioxide, water</p> Signup and view all the answers

Match the following elements with their role in combustion:

<p>Hydrogen = Combines with oxygen to form water Carbon = Combines with oxygen to form carbon dioxide Oxygen = Supports the combustion process Heat = Initiates the combustion reaction</p> Signup and view all the answers

Which of the following methods is NOT used to prevent corrosion of metals?

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

Tarnishing is a method used to prevent corrosion in metals.

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

What is rust?

<p>Rust is the oxide formed when iron reacts with moisture and oxygen.</p> Signup and view all the answers

Matter is anything that has ______ and volume.

<p>mass</p> Signup and view all the answers

Match the physical properties of matter with their definitions:

<p>Color = The visual perception of an object Melting Point = The temperature at which a solid becomes a liquid Solubility = The ability of a substance to dissolve in another substance Magnetic Response = The tendency of a material to attract or repel magnets</p> Signup and view all the answers

Which material is a good conductor of heat?

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

Plastic cups are suitable for containing acetone.

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

What is the chemical formula for Agricultural Lime?

<p>CaCO3</p> Signup and view all the answers

Metals have high melting and boiling points, making them suitable for use in __________.

<p>car engines</p> Signup and view all the answers

Match the properties with their respective examples:

<p>Flammability = Describes how a substance burns Acidity = Describes the pH level of a substance Electrical Conductivity = Ability to conduct electricity Solubility = Ability of a substance to dissolve in a solvent</p> Signup and view all the answers

What compound is formed when iron rusts?

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

Tarnishing affects metals by causing them to become shiny.

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

What are the two essential components needed for rust to form?

<p>Oxygen and water</p> Signup and view all the answers

The process of coating metals with a protective layer is known as ______.

<p>electroplating</p> Signup and view all the answers

Match the following metal properties to their effects:

<p>Rusting = Reddish-brown compound formation Tarnishing = Loss of shiny surface Electroplating = Protective coating Corrosion = Chemical attack on metal surface</p> Signup and view all the answers

Which of the following metals tarnishes easily?

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

The reaction of metals with air or moisture is called corrosion.

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

What is the primary reason why painted metal does not rust?

<p>The paint acts as a barrier to oxygen and moisture.</p> Signup and view all the answers

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

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

Physical properties can be observed without changing the substance.

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

What is matter made of?

<p>Atoms and molecules</p> Signup and view all the answers

Agricultural lime, which is made from __________, is used to increase soil pH.

<p>calcium carbonate</p> Signup and view all the answers

Match the following substances with their associated properties:

<p>Natural Gas = Highly flammable Plastic = Not suitable for acetone Chromium coating = Resists corrosion Metals = High melting and boiling points</p> Signup and view all the answers

Which gas is a significant contributor to acid rain?

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

The greenhouse effect is caused by ozone trapping the Sun's heat.

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

What is the primary effect of acid rain on the environment?

<p>It damages natural resources, including stonework and vegetation.</p> Signup and view all the answers

The main components of hydrocarbons are __________ and __________.

<p>carbon, hydrogen</p> Signup and view all the answers

Match the greenhouse gases with their primary sources:

<p>Carbon Dioxide = Burning fossil fuels Methane = Cattle waste Nitrous Oxide = Agricultural fertilizers Fluorinated gases = Industrial processes</p> Signup and view all the answers

Flashcards

Physical Change

A change in the form or appearance of a substance without a change in its chemical composition.

Chemical Change

A change that results in the formation of one or more new substances.

Combustion

A chemical reaction that releases energy in the form of heat and light, usually involving oxygen.

Physical Property

A characteristic of a substance that can be observed or measured without changing its chemical composition.

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Chemical Property

A property of matter that describes a substance's ability to undergo a chemical change, forming a new substance.

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Physical Change

A change in the physical state of a substance without forming a new substance.Example - Ice melting

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Chemical Change

A change that forms a new substance with different properties than the original substance. Example - Burning wood

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Oxidation

A chemical reaction that involves oxygen and forms a new product. Example: Rusting

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Combustion

A chemical reaction where fuels react with oxygen to produce heat and light. Produces carbon dioxide, water, smoke etc.

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Irreversible Change

A change that cannot be easily reversed. Cooking an egg, or burning toast, are examples of irreversible changes, because the molecules of the substances have re-arranged into new molecules.

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Oxidation

A chemical reaction where a substance combines with oxygen to form an oxide.

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Combustion

Burning, or the rapid chemical reaction of a fuel with oxygen, producing heat and light.

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Combustion Triangle

A diagram showing the three elements needed for a fire: fuel, oxygen, and heat.

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Fuel

A substance that can be burned to produce heat and light energy.

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Hydrocarbon

A type of fuel containing the elements carbon and hydrogen.

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Corrosion prevention

Stopping metals from reacting with air and water to avoid rusting and tarnishing.

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Rust

A reddish-brown coating formed when iron reacts with oxygen and water.

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Painted metal

Protected from corrosion, because the paint creates a barrier to keep air and water from the metal.

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Physical property

A characteristic of a substance that can be observed without changing its chemical makeup, like color, texture, or melting point.

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Matter

Anything that takes up space and has mass.

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Rusting definition

Corrosion of iron. Iron combines with oxygen and water forming iron oxide (rust).

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Tarnishing definition

Corrosion of other metals like copper or silver. Oxidation weakens the metal surface.

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Corrosion causes

Chemical reactions between a metal and its environment (air, water, acids).

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Preventing Corrosion-Method

Protective coatings like paint or electroplating to prevent metal from interacting with elements.

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Electroplating definition

Coating a metal with a less reactive metal to prevent corrosion.

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Rusting necessities

Air (oxygen) and water are needed for iron to rust

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Tarnishing cause

Metals reacting with chemicals in the air (specifically oxygen).

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Matter is..

Anything that has mass and takes up space.

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Metal Heat Conductivity

Metals easily transfer heat.

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Plastic Dissolving

Certain chemicals can dissolve plastic.

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High Melting/Boiling Point Metals

Metals often have very high melting and boiling points.

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Agricultural Lime Use

Agricultural lime increases the pH of acidic solutions.

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Chemical Property Definition

Chemical properties describe how a substance acts in reactions.

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Chemical Property

How a substance acts during a chemical reaction; it's not directly seen but needs a change to be observed

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Physical Property Example

A characteristic observed without changing the substance's makeup. Example: colour, melting point

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Lime's Chemical Property

Agricultural lime (calcium carbonate) makes soil less acidic.

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Flammability

A substance's ability to burn.

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Matter's Composition

Matter is made up of atoms and molecules.

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Acid Rain Composition

Acid rain contains substances like sulfur and nitrogen, which react with water in the atmosphere to form acidic compounds.

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Greenhouse Effect Cause

Increased carbon dioxide levels trap heat from the sun, leading to a rise in Earth's temperature.

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Hydrocarbon Elements

Hydrocarbons are chemical compounds made only of carbon and hydrogen.

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Greenhouse Gas - Methane

Methane, a greenhouse gas, comes from sources like swamps, cattle, and rice fields.

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Greenhouse Gases

Greenhouse gases, like carbon dioxide and methane, trap heat in the atmosphere.

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