What are the three particles that make up an atom?
Protons, Neutrons, Electrons.
100
What is it called when two different atoms bond together?
A compound
100
What is a homogeneous mixture?
A mixture that is evenly mixed. You cannot pick out the different parts.
100
What is a chemical change? Give an example.
A chemical change is when the atoms are not in the same order and the identity of a substance changes. Examples include: lighting things on fire, when things rust, when you see bubbles in a reaction
100
What is potential energy?
When an object is at rest and has stored energy
200
Protons have a ____ charge.
Neutrons have a ____ charge.
Electrons have a ____ charge.
Protons have a +1 charge.
Neutrons have a 0 charge.
Electrons have a -1 charge.
200
What is an element?
the same atom or the same atoms bonded together
200
What is a heterogeneous mixture?
A mixture that is NOT evenly mixed. You can easily pick out the different parts of the mixture.
200
What is a physical change? Give an example.
A physical change is when the material changes shape, but the identity does not change. Ex. breaking a pencil, ripping paper, lemonade dissolving
200
What is kinetic energy?
Energy an object gets when it is in motion
300
What is a molecule?
Two or more atoms bonded together. (the atoms share electrons)
300
What is a mixture?
When atoms are blended, but not chemically bonded
300
Give an example of a homogeneous mixture.
Kool aid, chocolate milk, lemonade, tomato soup
300
When ice melts, is it a physical or chemical change? Why?
Physical change- water is changing from its solid form (ice) to its liquid form
300
Give an example of potential energy.
A bike at the top of a hill, Miss Sweet before she falls down the stairs because she is wearing heels
400
Give an example of a molecule.
He2, CO2, NO2, H6... etc..
400
What is the difference between an element and a compound?
An element is the SAME atoms bonded together and compounds are DIFFERENT atoms bonded together.
400
Give an example of a heterogenous mixture.
Trail mix, Granite rock, chocolate chip cookie dough
400
What happens to the speed of molecules when liquid freezes into a solid?
They slow down.
Solid=slowest movement (least thermal energy)
Liquid= a little faster
Gas=fastest (most thermal energy)
400
Give an example of kinetic energy
Miss Sweet hitting the quan, Ms. Thornton running a mile, Ms. Harrington throwing books in the air because she is so happy her students are reading so much
500
What is the difference between an atom and a molecule?
An atom is the basic building block of everything (as small as it gets)
A molecule is when two or more atoms are bonded together (the atoms share electrons)
500
What is the difference between elements, compounds and mixtures?
Elements (SAME atoms) and Compounds (DIFFERENT atoms)
are chemically bonded.
Mixtures are atoms that are blended, but not chemically bonded.
500
Is air a homogeneous or heterogeneous mixture? Why?
Air is a homogenous mixture because it is evenly mixed. You cannot easily see the different atoms and elements that make up the mixture.
500
What happens to molecules during a chemical change?
The atoms rearrange to form new molecules.
500
Describe the relationship between potential energy and kinetic energy
Potential energy can be transferred into kinetic energy
Kinetic energy can be transferred into potential energy