6.1 Observing Chemical Change
Chemistry is the study of
matter and how it changes.
Scientists use chemical equations for what?
as a shorter way of describing chemical reactions.
What is activation energy?
is the minimum amount of energy needed to begin a chemical reaction.
Fire is a result of combustion which is what?
a rapid reaction between a substance and a fuel.
What has to be broken before you can use it?
An egg
What is an Endothermic Reaction
Reactions that occur when energy is absorbed
A chemical formula tells you what?
which elements a compound is made of and the ratio of those elements.
Exothermic reactions give off energy, meaning what?
There is less energy in the products than in the reactants.
When fuels do not burn completely, what could be produced?
Smoke and poisonous gas may be produced.
I’m tall when I’m young, and I’m short when I’m old. What am I?
A candle
What is an Exothermic Reaction
Reactions that occur when energy is released
What is the Conservation of Mass
During a chemical reaction, matter is not created or destroyed. All atoms present at the start of the reaction are present at the end.
Endothermic reactions require an input of energy to what?
keep going. There is more energy in the products than in the reactants.
What are the 3 necessary components to maintain a fire?
Fuel, oxygen and heat
What month of the year has 28 days?
All of them
(lol)
A Chemical Property is a characteristic of
a substance that describes its ability to change into other substances.
In an open system, matter can do what?
escape from the reaction.
Why don't all chemical reaction occur at the same rate.
Chemists can control chemical reactions by controlling certain factors or using catalysts or inhibitors.
The most common sources of home fires are what?
small heaters, faulty electrical wiring, cooking, and people being careless with cigarettes.
What is full of holes but still holds water?
A sponge
Physical Property is a characteristic of
a substance that can be observed without changing the substance into another substance.
In a closed system matter is
Unable to escape
What is concentration
The amount of substance in a given volume.
name some best fire safety preventions
Make sure flammable items are stored away from heat sources
Make sure wiring is up to code
Keep matches out of reach
Make sure smoke and heat detectors are functional
What is always in front of you but can’t be seen?
The future