Safety in the Lab
Matter
Physical or Chemical Change and Pure Substance or Mixtures.
States of Matter
More Matter
100
What does HHPS stand for?
Hazardous Household Products Symbols
100
How are physical changes different from chemical changes?
Physical change is a change in appearance where a chemical change is a change of the matter in the substance that forms a new substance with new properties.
100
Physical or Chemical change?
Fireworks exploding in the sky.
Chemical Change
100
What are the three common states of matter?
Solid, Liquid, and gas
100
Go from a liquid to a gas?
Vapourization (evaporation)
200
What does WHMIS stand for?
Workplace Hazardous Materials Information System
200
What is the formula used to calculte densidty?
Density = Mass divided by Volume
200
Pure substance or Mixture?
Water and milk
Pure substance and mixture (Protein, water, & lactose)
200
What is the relationship to volume of solids, liquids, and a gases?
Solid - fixed volume
Liquid - Fixed volume
Gas - Not fixed and it fills the shape of its container
200
Go from a liquid to a solid, and from a gas to a liquid?
Freezing and Condensation
300
What is the difference between HHPS and WHMIS systems?
HHPS is designed for households and WHMIS was designed for the workplace.
300
What is the Law of Conservation of Mass?
This is a scientific law that describes what happens in a chemical reaction to the reactants (the substances that react together).
It states that the mass of the products is always equal to the mass of the reactants.
300
Physical or Chemical Change?
Digesting food.
Chemical change
300
Go from a Gas to a solid, and from a solid to liquid.
Deposition and melting
400
What do these two symbols mean?
The triangle means that the container is dangerous, and the octagon means that the products within the container are dangerous.
400
Give two examples of qualitative physical properties and two examples of quantitative physical properties.
Qualitative: colour, flavour, odour, lustre, malleablity, texture, state of matter.
Quantitative: Boiling point, melting point, solubility, or viscosity.
400
Pure substance or Mixture?
Sea water, concrete, and liquid cake batter?
All three are mixtures
seawater - water and salt
concrete - lime, sand, and rocks
Liquid Cake batter - Sugar, milk, butter, eggs, flour, and baking powder.
400
What is the particle spacing for solid liquid and gas?
Particle spacing:
Solid - Very close together
Liquid - Close together but slip past each other.
Gas - Very far apart
400
Define difusion, which state of matter difuses the quickest, and what do you call it when matter goes from a solid to a gas?
Difusion: The movement of one material through another.
Gas difuses the fastest into other gasses.
Sublimation
500
Which two safety symbols would you expect to find on a propane tank and explain what they mean. Describe the shapes of the symbols and what the symbols would warn people from which hazrds?
the triangle shape and the octagone shape. They mean that the container is dangerous and that the contents are also dangerous.
The symbols are gas under pressure and flamable warning people not to puncture the tank or put it near sparks, flame or heat.
500
Define mass, volume, and density.
Mass: Quantity of matter inan object.
Volume: Amount of space a substance occupies.
Density: Quantity of mass in a certain volume of material.
500
Physical or Chemical change?
Chopping wood and roasting marshmallows on a fire?
Physical change and chemical change.
500
What is the Kinetic Molecular Theory, and what are the four components of the KMT?
KMT: explains what happens to the three states of matter s they undergo physical changes.
1.All matter is made up of tiny particles.
2. The particles are always moving.
3. They have space between them.
4. Particles are attracted to one another.
500
What is the movement of particles in solids, liquids, and gasses?
Particle arrangements are:
Solid - Can only vibrate and not move around too much.
Liquid - Can slip past each other and are moving quickly.
Gas - Can move freely and quickly in all directions.
600
What two symbols would be on a safety label for nitrous oxide? Explain their meaning.
Gas cylendar symbol: Compressed gas is dangerous if the container is punctured.
Flame symbol: Contents is highly flamable, so keep the product away from sparks, heat, and open flames.
600
If you had a substance that weighed 4 grams per 3 cubic cm of substance, would your substance float or sink in water?
The density of the substance would be 1.33 g/cm3 so this substance would sink to the very bottom of my container of water, which has a density of 1.0 g/cm3.
600
Are the following physical or chemical properties and state the type of property.
Aluminum tent posles are maleable.
Potassium in fireworks is reactive.
Propane gas in the BBQ is flamable.
Alumimun: Physical/Malleability
Potassium: Chemical/Reactive
Propane: Chemical/Combustable
600
State the process and wheter or not kinetic energy was added or taken away.
Dew forms on grass in the early morning.
Liquid hand sanitizer evaporated from your hand.
A brithday candle drips onto the cake.
A chunk of dry ice forms fog.
Dew: Condensation - KE is being taken away
Sanitizer: Vapourization - KE is increasing
Candle: Melting - KE is being added
Dry Ice: CO2 is sublimating - KE is being added
600
Explain how particles change state? What is happening to the matter that allows the particles to change state?
Matter changes state when kinetic energy is increased or decresased from the matter. When kinetic energy is removed, the particles slow down. When kinetic energy is increased the particles speed up and change from a solid to a liquid or a liquid to a gas.