Name the change of state: When a puddle begins to have a layer of ice in the winter...
Solidification.
How is the pitch of the heartbeat?
Low,
What would we observe if we change a mercury thermometer from a warm body to a cooler one?
Change in volume. The mercury would contract because the temperature is lower.
Name the change of state: I left my ice-cream out of the freezer for a long time...
Melting
A telescope is an example of reflexion or refraction?
Refraction (It refracts the light and makes objects seem larger)
Name the change of state: When you heat water in a kettle...
Evaporation
What type of light source is a light bulb?
Artificial.
What happens when two materials have different electrical charge?
They attract each other.
Which spoon is better to stir a hot soop so you don´t burn your hand, metal or wood? Why?
Wood. Because is a thermal insulator.
If there is atrain coming...how would we hear it first, through air or ground?
Ground, because is a denser material and the sound vibrates more.
Why does a wooden door get stuck sometimes in the summer?
Because when we increase the temperature of the matter the volume increases (The wood of the door expands and doesn´t fit in the door frame)
How is the pitch of a bird chirping?
High.
Which material will allow light to pass through them but will disperse it? window, sun glasses or mirror?
Sun glasses, because is a translucent material.
How do we measure the heat?
Using a thermometer.
During a storm...Do you think you see the lightning bolt first or hear the thunder first? Why?
We see the lightning bolt first because light travels faster than sound.
At what speed does sound travel?
340 metres per second.
How is the pitch of a lion?
Low