Chemical Reactions!

Chemical
Reactions

Learning About the Basics!

What is a Chemical Reaction?

Definition: When substances combine or break apart to form new substances.

Example: Baking a cake or rusting of iron.

Multiple Choice

What is a chemical reaction?

• A process where substances stay the same

• A process where substances combine or break apart to make a new substance

• A process where substances only change shape

• A process where heat is always made

Multiple Choice

What is an example of a chemical reaction?

• Water freezing

• A balloon popping

• Ion rusting

• Cutting a piece of paper

Multiple Choice

What happens to a substance during a chemical reaction?

• They stay the same

• They combine or break apart to form new substances

• Change shape without forming new substances

• Only change temperate

Chemical reactions are usually permanent. The reactants become new products that have different properties. It is hard to reverse these changes. When wood burns into ash we can't turn the ash back into wood.

Multiple Choice

Which is NOT an example of a chemical reaction?

• Baking a cake

• Melting ice

• Burning wood

• Digesting food

Multiple Choice

Which of the following best describes a chemical reaction in baking a cake?

• The ingredients change shape

• The ingredients combine to form new substances

• Ingredients evaporate

• No new substances are formed

Some reactions actually are reversible under certain conditions. FOR example, water and carbon dioxide can form carbonic acid which can be reversed to release water and carbon dioxide. MOST chemical reactions are permanent though.

What is a Chemical Reaction?

Definition: When substances combine or break apart to form new substances.

Example: Baking a cake or rusting of iron.

Signs of a Chemical Reaction

-Bubbles (gas forms)

-Color change

-Temperature change (gets hot or cold)

-Formation of a solid (precipitate)

Multiple Choice

What is NOT a sign of a chemical reaction?

• Bubbles form

• Color changes from blue to pink

• It is tasty

• Gets very hot

Multiple Choice

What does the formation of bubbles in a liquid usually show?

• It's being stirred

• A chemical reaction is producing a gas

• The liquid is evaporating

• The liquid is cold

Multiple Choice

If a substance gets very hot during a reaction, what might this show?

• The container is too small

• The substance is cooling down

• The chemical reaction is releasing energy

• The substance is melting

Reactants and Products

Reactants: The starting materials in a chemical reaction.

Products: The new substances formed after the reaction.

Example: Hydrogen + Oxygen ---> ---> Water (H₂O)

Multiple Choice

What are the substances called that start a chemical reaction?

• Reactants

• Products

• Catalysts

• Solvents

Multiple Choice

In a chemical reaction, the new substances are called the

• elements

• reactants

• products

• mixtures

Multiple Choice

Hydrogen + Oxygen ---> Water

What is the product?

• Hydrogen

• Oxygen

• Hydrogen + Oxygen

• Water

Multiple Choice

What happens in a chemical reaction?

• Reactants change into products

• Products change into reactants

• Products are added to reactants

• reactants and products stay the same

Multiple Choice

In a chemical reaction, which of the following are true?

• Products are the same as reactants

• New substances are formed

• Reactants disappear and don't form anything

• reactants and products don't change

Examples of Chemical Reactions

Combustion: Burning wood → heat and light.

Photosynthesis: Plants make food using sunlight.

Rusting: Iron reacts with oxygen to form rust.

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Photosynthesis Chemical Reaction

Multiple Choice

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

• Boiling water

• Burning wood

• Tearing paper

• Melting ice

Multiple Choice

What happens in photosynthesis, a chemical reaction in plants?

• Plants produce food energy by burning food

• Plants create food using sunlight, carbon dioxide, and water

• Plants grow bigger by absorbing water

• Plants release energy by breaking down food

Multiple Choice

What does trusting or iron represent?

• A chemical reaction between iron and oxygen

• A physical change

• Iron melting

• Iron being stretched

Multiple Choice

Which of the following is an example of a combustion reaction?

• Digesting food

• Plant absorbing sunlight

• Wood burning and making heat and light

• Water freezing into ice

Everyday Chemical Reactions

Cooking: Mixing ingredients to bake a cake.

Digesting food: Your body breaking down food for energy.

Multiple Choice

What chemical reactions happens in our bodies after eating food?

• The food evaporates

• The food changes color

• The food digests and breaks down into energy

• The food is cooled down and becomes frozen

Multiple Choice

Which of the following is an example of a chemical reaction in cooking?

• Baking a cake

• Melting butter

• Cutting vegetables

• Stirring soup

Multiple Choice

What chemical reaction happens in your body when you eat food?

• Freezing

• Photosynthesis

• Digestion

• Melting

Multiple Choice

Which is an example of a chemical reaction?

• Water boiling into steam

• Iron rusting

• Sand and water

• Breaking a pencil

Multiple Choice

Why is baking a cake an example of a chemical reaction?

• The ingredients are only mixed together

• The ingredients combine and make new substances

• The cake rises without any changes

• The ingredients evaporate

Multiple Choice

Which of the following involves a chemical reaction?

• Folding clothes

• Lighting a match

• Stirring sugar into tea

• Blowing up a balloon

Did you know?

The bubbles in soda are from a chemical reaction between carbon dioxide and water!

Multiple Choice

What causes bubbles in soda?

• Water boiling

• Chemical reaction between carbon dioxide and Water

• Sugar dissolving in water

• Soda being shaken

Multiple Choice

When you open a soda bottle, what happens to the carbon dioxide gas?

• It turns to liquid

• It stays dissolved in the soda

• It escapes as bubbles

• It freezes

Multiple Choice

Why do sodas fizz when shaken before opening?

• Shaking adds more water to the soda

• Shaking causes more CO2 to dissolve in the liquid

• Shaking increases the pressure, releasing more CO2

• Shaking heats up the soda

Chemical reactions are everywhere!

Can you spot any chemical reactions at home?