Chemical Changes

Chapter 11: Chemical Changes

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Multiple Choice

You split logs into pieces with an axe before burning them.

• Physical change

• Chemical change

• One or more new substances are formed.

• Changes are not easily reversed.

Chemical

• No new substances formed.

• Changes can usually be reversed to obtained the original substances, e.g. evaporation / filtration.

Physical

Physical VS Chemical Changes

Multiple Choice

Opening and shaking a hand warmer packet makes it heat up.

• Physical change

• Chemical change

Multiple Choice

Fizzy gas bubbles are produced as a powder is added to a clear liquid.

• Physical change

• Chemical change

Multiple Choice

Sugar dissolves into water and disappears.

• Physical change

• Chemical change

Multiple Choice

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Multiple Choice

A change where one or more new substances are created.

• Physical Change 
• Chemical Change 

What is a Word Equation?

​Hydrogen reacts with Oxygen to form water

What is a Word Equation?

​Hydrogen reacts with Oxygen to form water

Multiple Choice

In a word equation the REACTANTS

• Are written on the right hand side of the arrow

• Are produced in a chemical reaction

• Are always the same

• Are the substances that react together

Multiple Choice

In a word equation the REACTANTS

• Are written on the right hand side of the arrow

• Are written on the left hand side of the arrow

Multiple Choice

What are the reactants in this word equation?

• Carbon dioxide and oxygen

• Carbon dioxide and water

• Oxygen and glucose

• Oxygen and water

Multiple Choice

The products in this reaction are?

• On the left side of the equation

• On the right side of the equation

Multiple Choice

Identify the product(s) in this word equation

• Sodium

• Sodium chloride

• Sodium and Chlorine

• Sodium and sodium chloride

Multiple Choice

In this chemical reaction zinc is a...

• Product

• Reactant

• Neither

Multiple Choice

Magneisum reacts with oxygen to form magnesium oxide. The correct word equation is...

• A

• B

• C

• D

Multiple Choice

In the chemical reaction in the image, what does the + sign represents?

• mixing of substances

• formation of the products after substances are mixed tog

Multiple Choice

In the chemical reaction in the image, what does the -> sign represents?

• mixing of substances

• formation of the products after substances are mixed together

Multiple Choice

In the chemical reaction in the image, what did you observe?

• Number of white atoms on the left side is EQUAL to the number of white atoms on the right side of the arrow

• Number of white atoms on the left side is NOT EQUAL to the number of white atoms on the right side of the arrow

Multiple Choice

In the chemical reaction in the image, what did you observe?

• Total number of atoms before and after reaction are EQUAL.

• Total number of atoms before and after reaction are NOT EQUAL.

Multiple Choice

In the chemical reaction in the image, what did you observe?

• the mass of reactants is EQUAL to the mass of the products

• the mass of reactants is NOT EQUAL to the mass of the products

Multiple Choice

Identify the type of chemical changes.

Carbon burns with oxygen to form carbon dioxide

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

Identify the type of chemical changes.

calcium carbonate breaks down into 2 substances when heated

$$calcium\ carbonate\ \rightarrow\ calcium\ oxide\ +\ carbon\ dioxide$$

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

Identify the type of chemical changes.

Sugar turns into caramel when heated

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

Identify the type of chemical changes.

rusting of nail

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

Identify the type of chemical changes.

Petrol burns with oxygen

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

Identify the type of chemical changes.

browning of apple in air

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

Identify the type of chemical changes.

acid reacts with an alkali

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Multiple Choice

orange juice is

• sour in taste

• bitter in taste

Multiple Choice

orange juice is

• an acid

• an alkali

Multiple Choice

lime juice is

• an acid

• an alkali

Multiple Choice

Fizzy drinks are

• acidic

• alkalis