INTRO & SAFETY
What does WHMIS stand for?
Workplace Hazardous Materials Information System
What is a substance made of only one type of atom called?
Element
This type of circuit has only one path for current.
series circuit
Why is DNA replication described as “semi-conservative”?
Because each new DNA molecule contains one original strand and one newly built strand
This unit is used to measure electric current.
amperes (A)
What should you always do before starting a lab experiment?
Complete the Pre-Lab, Read the procedure and safety instructions
Two substances have the same number of protons but different masses. Explain what is the difference between these substances?
they have different numbers of neutrons
Why are lightning rods placed on tall buildings, and how do they protect the structure?
They provide a low-resistance path for electric charge to safely discharge into the ground, preventing damage from lightning
A population of bacteria reproduces rapidly through binary fission. Explain one advantage and one long-term disadvantage of this method compared to sexual reproduction.
Advantage: fast reproduction with no need for a mate; disadvantage: low genetic variation makes population more vulnerable to environmental changes or disease
(answers may vary)
Name this ionic compound: MgO
magnesium oxide
Why is it important to repeat an experiment multiple times before drawing a conclusion?
To reduce random error and ensure results are reliable and consistent
What happens to electrons when making an ionic compound?
They are transferred or shared between atoms
What is the main advantage of wiring household circuits in parallel instead of series?
Each device operates independently, so if one fails the others still work and all receive full voltage
During DNA replication, an error occurs and one base is substituted, but the resulting protein is unchanged. How is this possible?
silent mutation, code for same amino acid
Name this compound: Al₂(SO₄)₃
aluminum sulfate
give 5 examples of qualitative observations
answers may vary: ex: colour, texture, etc
In a reaction, a substance changes colour and produces a gas.What kind of reaction is this?
Chemical Reaction
What happens to total resistance when resistors are added in parallel
Total resistance decreases
What is the role of mRNA in protein synthesis?
It carries the genetic code from DNA in the nucleus to the ribosome for protein building
A 9V battery powers a circuit with 3Ω resistance. What is the current?
In an experiment, a student spills an acid on the lab bench. What is the correct sequence of actions they should take immediately?
Alert the teacher, follow spill cleanup procedures (use a base to neutralize it then clean), and ensure area is secured
Name this covalent compound: N₂O₅
dinitrogen pentoxide
Two identical bulbs are connected in parallel to a battery. One bulb is removed. What happens to the brightness of the remaining bulb
The remaining bulb stays the same brightness
A species has 24 chromosomes in its body cells. How many chromosomes will be in its gametes?
12 chromosomes
phase in the cell cycle where DNA is copied
interphase