Chemical Reactions

Presentation

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Science

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8th - 10th Grade

•

Medium

•

NGSS

MS-PS1-2, MS-PS1-5, HS-PS1-5

Standards-aligned

Daisy Benford

Used 767+ times

FREE Resource

7 Slides • 10 Questions

Chemical Reactions

What is a chemical reaction?

A chemical reaction is a process where a set of substances undergo a chemical change to form a different substance.

Where do chemical reactions occur?

They happen all the time, every where in the world.
Every time you eat, your body uses chemical reactions to break down your food into energy.
Other examples include metal rusting, wood burning, batteries producing electricity, and photosynthesis in plants.

What are reagents, reactants, and products?

Reactants and reagents are the substances that are used to bring about the chemical reaction
A reactant is any substance that is consumed or used up during the reaction.
The substance that is produced by a chemical reaction is called the product.

Signs of a Chemical Reaction

heat production
change in temperature
formation of a precipitate
change in color
odor production
light production
formation of a gas (bubbles)

Multiple Choice

In a chemical reaction

The atoms of the reactants always stay together to form the products

The atoms of the reactants unbond, rearrange, and then rebond to form the products

New atoms are formed which combine to make the products

Some atoms disappear while others multiply to form the products

Multiple Choice

The left side of the equation below is called

Products

Reactants

Multiple Choice

Which observation(s) might be used as evidence that a chemical reaction occurred?

Color change

Odor change

change in temperature

All of the above

Reaction Rate

Some happen very quickly like explosions, while others can take a long time, like metal rusting.
The reaction rate can be changed by adding energy, a catalyst, or changing the particle size.
Increasing the concentration or pressure of the reactants can speed up the reaction rate.

Multiple Choice

The rate of a chemical reaction is NOT affected by which of the following:

temperature

concentration

particle size (surface area)

All of these affect reaction rates

Types of Chemical Reactions

Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion

Multiple Choice

What type of reaction is the following:
$Zn\ +\ 2HCl\ \rightarrow\ ZnCl_2+H_2$

Combination

Decomposition

Single Replacement

Double Replacement

Combustion

Multiple Choice

What type of reaction is the following:
$BaCl_2+2KI\ \ \rightarrow\ 2KCl\ +\ BaI_2$

Combination

Decomposition

Single Replacement

Double Replacement

Combustion

Multiple Choice

H₂+ O --> H₂O

Synthesis

Decomposition

Single replacement

Double replacement

Multiple Choice

The following reaction is an example of what reaction type?

CoCO₃ → CoO + CO₂

Synthesis

Decomposition

Single Replacement

Double Replacement

Multiple Choice

CxHy +O₂--> H₂O + CO₂

Decomposition

Double replacement

Combustion

Single Replacement

Poll

How do you rate your understanding of chemical reactions?

Level 1

Level 2

Level 3

Level 4

Chemical Reactions

Show answer

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