Show:
Types of Reactions
Chemical Properties
Acids & Bases
Class Experiments
Reaction Rates
100
What is the reaction called when two (or more) substances come together?
Marriage
100
What evidence(s) of a chemical reaction did we see when we added magnesium strips to hydrochloric acid?
Bubbles of gas & heat
100
A substance with a pH of 4 is considered what?
An acid
100
When rust formed on the steel wool what reacted with the steel wool and what was the matchmaker?
Oxygen reacted, vinegar was the matchmaker
100
What temperature would increase a chemical reaction? Why?
hot because the particles are moving faster allowing for more collisions
200
What is it called when a substance breaks down into two (or more) smaller ones?
Decomposition
200
What evidence of a chemical reaction did we see when we added vinegar as a catalyst (matchmaker) to the steel wool?
Change in colour
200
A substance with a pH of 11 is considered what?
A base
200
Why do oil and water not mix?
Water is polar and oil is not
200
Would a higher or lower concentration increase the reaction rate? (hint: think acid)
the higher the concentration the more particles are present which allows for more collisions
300
What is it called when one substance comes along and bumps out another in a compound?
Single displacement
300
What evidence of a chemical reaction did we see when we mixed lead nitrate and potassium iodide?
Change in colour (bright yellow)
300
Are acids sour or bitter?
Sour
300
What happened when we put calcium in water?
Bubbles formed and clouded the water
300
Would a sugar cube react quicker than powdered sugar with a substance? Why or why not?
The powdered sugar would react faster because of the greater exposed surface area
400
What type of reaction is it when two substance swap partners?
Double displacement
400
Name any two substances that we used in class that are clear, colourless and liquid. How could we tell them apart?
Various
400
What happens if you mix bleach (a base) with hydrochloric acid?
They will neutralize
400
Was bleach an acid or a base?
Acid
400
Would a larger or smaller volume result in a quicker reaction? Why?
The smaller because the particles are closer together which allows for more reactions.
500
What type of reaction was the magnesium in hydrochloric acid?
single displacement
500
What evidence of a reaction did we see when we put the copper wire into the silver nitrate?
A silver precipitate formed
500
Which acid is stronger, pH 1 or pH 4?
pH 1
500
Was Febreeze and acid or a base?
Acid
500
What is a catalyst's role in a reaction?
Matchmaker: bringing particles together