Atoms & Particles
A negatively charged particle that moves around the nucleus of an atom
What is Electron?
Any solid, liquid, or gas is defined as __________.
What is Matter?
The upward force of water acting on an object is called __________.
What is Buoyant Force?
A mixture where one substance dissolves in another with the same properties throughout.
What is Solution?
Ripping paper is a __________ change; burning paper is a __________ change.
What is Physical and Chemical?
The center of the atom that contains protons and neutrons is called the ________.
What is Nucleus?
The amount of space an object takes up is called __________.
What is Volume?
True or False: If an object weighs 10 N but the buoyant force is 15 N, the object will float.
What is True?
The chemical symbol CO₂ for carbon dioxide is an example of a __________.
What is a Chemical Formula?
This state of matter has particles tightly packed and vibrating in place.
What is a Solid?
The number of protons in an atom is its __________.
What is Atomic Number?
An object’s ________ will be the same on Earth and the Moon, but its ________ will be different.
What is Mass and Weight?
A reaction that gives off heat is __________; one that absorbs heat is __________.
What is Exothermic and Endothermic?
Oil and water that briefly mix but separate again is called a(n) __________.
What is Emulsion?
What is the difference between physical changes and chemical changes?
Physical changes do not change the substance; chemical changes make a new substance.
If you change the number of protons in an atom, it becomes a different ________.
What is Element?
Mass over volume (M/V) is __________.
What is Density?
Which change makes matter go from solid → liquid → gas?
Adding heat will make particles move faster
Saltwater is an example of a __________.
What is Solution (homogeneous mixture)?
A __________ has particles packed tightly together, a __________ has particles a little more spaced out but still pretty close together, and a __________ has particles spaced very far apart.
What is Solid, Liquid, Gas?
When an atom has an unequal number of protons and electrons, it becomes a(n) ________.
What is Ion?
If an object has a mass of 6 kg and a volume of 2 L, its density is __________.
What is 3 kg/L?
What is the opposite change from gas → liquid → solid?
Removing heat (particles slow down).
Sand mixed with iron filings is an example of a __________.
What is Heterogeneous Mixture?
What is the difference between ionic bonds and covalent bonds? (bonus points if you give me an example of each)
Ionic = transfer of electrons (example: NaCl), Covalent = sharing of electrons (example: H₂O)