Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
26 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Atom |
The smallest particle of an element that has all of the element's chemical properties. |
. |
|
|
Brownian Motion |
The movement of tiny particles suspended in gas or a liquid that results from their colliding with other particles. |
. |
|
|
Electron |
Negatively charged particle that whizzes about within a particle. Surrounds nucleus. |
. |
|
|
Atomic nucleus |
Core of the atom. Consists of neutrons and protons. |
. |
|
|
Atomic number |
The number that designates the identity of an element. It is the number of protons in the nucleus. |
. |
|
|
Periodic table of elements |
A chart that lists the elements in a systematic way. |
. |
|
|
Element |
A pure substance that consists of only one kind of atom. |
Some examples include C, H2, He |
|
|
Neutron |
An electrically neutral particle located within the atom's nucleus. |
. |
|
|
Proton |
A positively charged particle in the nucleus. |
. |
|
|
Ion |
An electrically charged atom; an atom with an excess or deficiency of atoms. |
. |
|
|
Isotopes |
Atoms of the same element that contain different numbers of neutrons. |
. |
|
|
Atomic mass unit (amu) |
The standard unit used to measure atoms. 1/12 the mass of carbon. |
. |
|
|
Compound |
A material in which atoms of different elements are chemically bonded together. |
Ex: H2O |
|
|
Mixture |
A substance whose components are mixed together without combining chemically. |
. |
|
|
Molecule |
Two or more atoms that bond together by a sharing of electrons. |
. |
|
|
Antimatter |
Nucleus is made up of electrons and the outer shells are composed of neutrons and protons. |
. |
|
|
How would you describe the motion of particles when talking about the Brownian motion? |
He described the particles as a jiggling movement. |
. |
|
|
Why can't atoms be seen with a powerful light microscope? |
Atoms are too small to be seen with visible light. Because of diffraction, you can discern details no smaller than the light that you use to look with. |
. |
|
|
Where is most of the mass of an atom located? |
At the center. Within the nucleus. |
. |
|
|
What are nucleons? |
Either a neutron or a proton. Depending on the electrical charge.
|
. |
|
|
What is the most abundant element in the known universe? |
Hydrogen. More than 90% of the atoms are hydrogen. |
. |
|
|
What are the five most common elements? |
Oxygen, carbon, hydrogen, nitrogen, and calcium. |
. |
|
|
How come heavier atoms aren't much larger than lighter elements? |
There is a stronger nuclear attraction which causes the space in between the layers to become smaller. |
Pg. 217 |
|
|
Atomic mass |
Is the total mass of an atom |
. |
|
|
What is the difference between molecules and atoms? |
Atoms form together to create molecules. |
. |
|
|
What are nucleons composed of? |
Quarks. |
. |
