Introduction to Chemical Reactions

Presentation

•

Chemistry

•

9th Grade

•

Medium

•

NGSS

MS-PS1-1, MS-PS1-5, HS-PS1-7

Standards-aligned

Used 62+ times

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10 Slides • 16 Questions

Introduction to Chemical Reactions

What is a chemical reaction?

A chemical reaction is when one or more substances undergoes a chemical change into a new substance(s).
We represent chemical reactions with chemical equations.

We use letters to indicate the state a substance is in during a reaction.

Multiple Choice

A _____ is a chemical change when reactants change to become different products.

chemical change

chemical reaction

chemical equation

chemistry

Multiple Choice

What is the arrow in a chemical equation...

H_{2 +}O --> H₂O

Reactants

Products

Yields

Chemical Equation

Multiple Choice

The blue numbers in the image below represent ________

I don't know, and don't want to try

coefficients

subscripts

none of the answers are correct

Multiple Choice

The red numbers in the image below represent ________

subscripts

coefficients

I don't know, and don't want to try

None of the answers are correct

Multiple Choice

What is the part of the chemical equation in green called?
Fe + S --> FeS

products

reactants

yield

chemical formula

Multiple Choice

When an italics lower case aq, (aq), is found beside a chemical in an equation it indicates that the chemical is _____________.

liquid

a precipitate in water

dissolved in water

gaseous

Multiple Choice

When an italics lower case g, (g), is found beside a chemical in an equation it indicates that the chemical is _____________.

liquid

insouble

soluble

gaseous

Multiple Choice

When an italics lower case s, (s), is found beside a chemical in an equation it indicates that the chemical is _____________.

souble

insouble

solid

silver

Indicators of a Chemical Reaction

Formation of a gas
Formation of a precipitate
Change in color
Change in temperature without heating or cooling it
Production of light
Production of an odor

Law of Conservation of Mass

Matter is neither created nor destroyed, only changed.
This means that the atoms used at the start of the reaction must equal the amount of atoms at the end of the reaction. Therefore, we must balance chemical equations.

Coefficients

In order to balance chemical equations, we use coefficients. Coefficients mutliply the number of atoms in a formula.

Multiple Choice

The coefficient in 3H₂O is

Multiple Choice

How many Hydrogen (H) atoms are in 4NH₃?

Multiple Choice

How many Nitrogen (N) atoms are in 4NH₃?

Multiple Choice

How many Al atoms are in this compound? 4Al₂O₃

Multiple Choice

How many atoms of oxygen are represented in 2Ca(NO₃)₂?

Multiple Choice

Matter can not be created nor destroyed: it can only be

Destroyed a little bit

Invisible

Transformed, changed

None of the above

Multiple Choice

If reaction starts with 20g of reactants it should produce

a total of 40g of products

a total of 10g of products

a total of 80 g of products

a total of 20g of products

Multiple Choice

You know you a chemical reaction has occurred if

there is a precipitate.

there is a color change.

there is a temperature change.

All of these answers are evidence.

Introduction to Chemical Reactions

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