Lab safety rules
True or False
Playing and running in the lab is okay
False
What are hazards symbols?
Symbols that warn you of the danger or hazard of an object/substance
It is used for containing a small amounts of liquid
test tube/boiling tube
What is the standard international unit of mass?
Kilogram
Define density
The amount of mass per unit volume
True or False
You must always wear safety goggles when doing ALL experiment
False - You only wear it when it involves chemicals or projectile experiment
If the hazard symbols show a 'fire' on a substance, what is the symbol trying to warn?
The substance is flammable
True or False
A beaker can be used to measure an accurate amount of liquid
False- It has limited measurement line to read
Convert 455mm into centimeters
10mm - 1cm
45mm = 45.5 cm
The formula to calculate the density of a subtance
Density = mass/volume
If a chemical were to get into the eyes, what is the immediate response?
Go to the nearest water station, wash the eyes under running water.
The substance can eat away other materials away, what hazard symbol should be indicated on the substance?
Corrosive
An instrument that can be used to measure the internal diameter of a typical hollow water pipe
Internal caliper
The curvature of water in a narrow space tube is called the ________
Meniscus
If a piece of glass has a density of 2.5g/cm3, What will happen if placed in water, explain your answer.
It will sink because it is denser than water
What is the 3 fire emergency tools that is commonly found in the lab?
Fire extinguisher, sand bucket and fire blanket
What is the hazardous symbol usually place on medical waste products from hospitals?
Biohazardous symbol
An instrument can be used to measure mass that is below 1g
Electronic balance
A cube was placed on a table has a side of 4cm, calculate the area that is facing upward
4 x 4 x 4
64cm2
(A cube has the same area on all sides)
A shiny liquid has a mass of 337.5g. Its volume was measured at 25cm3. Calculate the density and name the substance.
13.5g/cm3, Mercury
When heating a chemical with a test tube, list 4 precautions that needs to be done
1) Use a test tube holder when heating
2)Point away mouth of the test tube away from any person
3) while heating no flammable source should be nearby the heating source
4) Wear safety goggles
What hazardous symbol should be put on chemicals that are harmful or potentially lethal in small doses?
What would the symbol look like?
Toxic, a skull
Describe briefly in 3 steps to light up a bunsen burner and get a non-luminous flame
1) Close the air hole
2) Light-up match
3) Open gas
4) Open-air hole
A cylindrical pipe has a diameter of 6cm and a length of 15cm. Calculate its volume to the nearest whole number.
Pie x r2
3.14 x 32
= 28.3cm2 x 14.5cm
= 410 cm3
A room has a dimension of 3m by 4m by 6m. What is the mass of the air in the room in g?
Assuming the density of air is 1.225 kg/m3
Volume: 3m x 4m x 6m
= 72 m3
Mass = 1.225 kg/m3 x 72m3
= 88.2 kg x1000
= 8820g