Lab Safety
Name two reasons for wearing safety glasses during experiments
Broken Glass
Chemicals/hot water in eyes
What are the three main states of matter?
Solid, Liquid, Gas
What is it called when matter changes from a solid to a liquid?
Melting
What two things do we need to know to calculate denisty?
mass and volume
What is the scientific name for rain?
Precipitation
Should you light a bunsen burner with the air hole open or closed?
Closed!
Which state of matter has a fixed volume but not a fixed shape?
Liquid
What is it called when matter changes from liquid to gas?
Evaporation
What is the formula for density?
d=m/v
True or false: The amount of water on earth is always the same
True! It cycles around and changes state but the amount stays the same
Why should you use the orange flame when first lighting a bunsen burner? (2 reasons)
Which state of matter does not have a fixed shape or volume?
Gas
What is it called when matter changes from a gas to a liquid?
Condensation
If a block of wood had a mass of 100g and a volume of 20cm3 what is it's density?
5g/cm3
Water that comes from plants and is then released into the air as water vapor is called ______.
Transpiration
Why do we not pour all chemicals down the sink?
They can corrode or block pipes
What would cause gas particles to move faster?
Heat
When matter changes evaporates is it losing or gaining energy?
Gaining! It is being heated
How are density and buoyancy related?
Something less dense will be more buoyant
Where does energy for the water cycle come from?
The sun
Why is it important to clean all equipment properly before putting it away?
It may cause unexpected chemical reactions when next ised
Would a cold or hotter liquid cause food colouring to diffuse quicker and why?
Hotter as the particles have more energy resulting in faster movement
When matter freezes is it becoming more or less dense?
Why does oil float on top of water?
It is less dense
How does rain happen?
Raindrops fall to Earth when clouds become saturated, or filled, with water droplets. Rain is liquid precipitation: water falling from the sky. Raindrops fall to Earth when clouds become saturated, or filled, with water droplets. Millions of water droplets bump into each other as they gather in a cloud.