- Test must be retaken within 2 weeks.
- You must work through the textbook, one assignment per night
- You must come to my room and check/turn in work each day before/after class
- All assigned work must be completed within 2 weeks
- You will receive the better of your two scores
Holt Science and Technology Online Textbook
Identity Username Password
Marie Curie mcurie45 radium
Rosalind Franklin rfranklin270 helix
Ivan Idea iidea eureka
Percy Julian pjulian31 steroid
Brian May bmayy6 queen
Jimmy Neutron jneutron14 genius
Doctor Q dqhsz brain
Tom Scholz tscholz14 boston
Ima Scientist scientist6 invent
Detailed List of What You Should Know
The structure of the atom:
o that it is composed of extremely small particles that are too small to be seen with an optical microscope and that size at the
atomic level is measured on the nanoscale.
o that there are three basic particles in the atom (proton, neutron, and electron).
that the atom is the basic building block of matter, that a single atom has mass and takes up space, and that all matter is composed of atoms. Students know that each of the elements has distinct properties and a distinct atomic structure. All forms of matter are composed of one or more of the elements. Students recognize that scientists have identified more than 100 elements that combine in a multitude of ways to produce compounds that make up all living and nonliving things.
that an atom is the smallest unit of an element and that a compound is composed of two or more elements chemically combined.
Students know that scientists identify and classify elements, compounds and mixtures according to their physical and chemical makeup.
the differences among elements, compounds and mixtures.
o Elements are pure substances that cannot be changed into simpler substances.
o Elements are composed of one kind of atom.
o Compounds are pure substances that are composed of two or more types of elements that are chemically combined.
o Compounds can only be changed into simpler substances called elements through chemical changes
o Mixtures are physical combinations of two or more different substances that retain their own individual properties and are
combined physically (mixed together).
o Mixtures can be separated by physical means (filtration, sifting, or evaporation). Characteristic properties can be used to
identify different materials and to separate a mixture into its components.
o Mixtures may be heterogeneous or homogeneous.
In a heterogeneous mixture, which is not uniform throughout, the component substances can be visibly distinguished.
Tossed salad, granite, and iced tea are examples of heterogeneous mixtures.
In a homogeneous mixture, which is uniform throughout, the substances are evenly mixed and cannot be visibly
distinguished. Air, steel, clear salt-water are examples of homogeneous mixtures.
that in solids the atoms are closely locked in position and can only vibrate; in liquids the atoms and molecules can collide with