Chemical Reactions
How can you cause a substance to turn from a solid to a liquid or a liquid to a gas?
Add energy, most often thermal energy (heat)
How are we able to see cells?
light microscopes
Where to you find energy?
Anywhere there are moving objects, sounds, light, and heat
What are some things scientists can figure out by studying rock layers?
What the rocks are made of and about different things that lived during that time
something that does work, makes a change
How is ice melting different than burning something?
When you melt ice, it's a change in the state of the molecules, but when you burn something, you create a new substance.
Are all cells the same? Why?
No, cells are specialized based off their functions.
What is a wave?
a repeating pattern with a specific wavelength, frequency, and amplitude
What is erosion?
When wind and water move particles around
What is an example of energy transfer?
Any of the following: moving something, heat, light, sound
How do you know a chemical change has occurred?
If a new substance is formed, it has different properties.
What's the difference between unicellular and multicellular organisms?
Unicellular = one cell like an ameoba.
Multicellular = many cells, like humans, animals, and plants
how is a sound wave different than a light wave?
Sound waves need matter to travel through, but light waves do not
What is weathering?
When rocks are broken down into smaller pieces
What does kinetic mean?
Movement
What does a catalyst do in a chemical reaction?
It helps it happen faster.
What is the job of the mitochondria?
IT'S THE POWERHOUSE OF THE CELL!!!
What happens when a light is shined on an object?
It can be absorbed, reflected, or transmitted through the object
Explain how sedimentary rocks are formed
small pieces of broken down rock and dirt (sediment) are collected and pressurized to create a new rock
What does potential mean?
having the capacity, can develop into something in the future
Name 3 different properties you can test before and after a chemical reaction to determine if a new substance was formed.
Any combination of the following: magnetism, flammability, electricity, density, and color
how are animal and plant cells different?
plant cells have chloroplasts and cell walls
What is the relationship between the amplitude of a wave and and the amount of energy it produces?
higher amplitude = more energy
How old is the Earth?
4.6 billion years old
When would a roller coaster have the most potential energy?
At the top of the drop