Lab Safety
True or False:
When lighting magnesium ribbon on fire, you do not need to wear eye protection.
FALSE
What is a physical change?
Change in form. A new substance is not formed. It is reversible.
Write the formula for density.
d=m/V
Where is each subatomic particle located in the atom?
Protons and neutrons are in the nucleus
Electrons are in the shells/orbits
What did Thomson discover?
Discovered electrons
What does HHPS stand for?
Hazardous Household Product Symbols
What is a chemical change?
A new substance is formed. A chemical change has happened.
What are the variables in the density equation?
Mass, volume, density
How many neutrons does chlorine have?
18
What did Rutherford discover?
Discovered the nucleus
What does WHMIS stand for?
Workplace Hazardous Material Information System
Classify each as chemical or physical changes
Rusting - chemical
Boiling water - physical
Tearing paper – physical
Burning wood - chemical
What are the units used for the density equation for each variable?
Mass - g
Volume - cm3
Density - g/cm3
what is the lewis diagram for phosphorus.
Bonus: Will phosphorus gain or lose electrons?
What did Bohr discover?
That electrons are at different energy levels
What does this WHMIS symbol represent?
Flammable
Oxidizer
Corrosive
Health Hazard
Compressed Gas
Explosive
Biohazardous Infectious Material
Harmful/Irritant
Toxic
Give three signs that a chemical change has occurred.
Gas produced
Colour change
Temperature change
Light produced
Precipitate forms
Bonus 100, what is a precipitate
A substance has a volume of 5cm3 and a mass of 20g. What is the density?
D = 4g/cm3
What is the Bohr diagram for fluorine?
Bonus: Is fluorine electropositive or electronegative?
What did Thomson think the atom looked like when he made his discovery
Raisin bun model
What are the levels of hazard for the HHPS Symbols
Caution, Warning, Danger
A student dissolves salt in water, then evaporated the water and gets the salt back. Explain whether this was a physical or chemical change and justify your answer.
Physical change, salt can be recovered and no new substance is formed
A metal is 8 g/cm3 and 3cm3. What is the mass?
M = 24g
Do the ionization calculation for magnesium.
Mg +2
What did Rutherford do to find his discovery
He shot alpha particles at gold foil and saw that the particles bounce in every direction