Chemical Changes

Presentation

•

Science

•

8th Grade

•

Practice Problem

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Medium

Xu Kaibin

Used 2+ times

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4 Slides • 29 Questions

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...

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

Chapter 11: Chemical Changes

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