Moon Phases
Eclipses & Tides
Changes in Matter - Physical vs. Chemical
Conservation of Matter - Products & Reactants (KNOW THIS!!!)
What is Temperature? What is Thermal Energy?
NJSLA Practice Test Questions on Temperature (kinetic energy) and Thermal Energy
Oooff! More on those Practice Test questions about Temperature (kinetic energy).
Sorry. More on those Practice Test questions about Temperature.
Moon Phases 2023-24 mov.movThose NJSLA test people have asked questions in previous years about moon phases . . . and they don't just ask one. They ask 3-4 questions. So, you need to know how the moon phases change through the lunar (moon) cycle. Get comfortable with Position 1 (new moon) and Position 5 (full moon). You can do this!!
Eclipses & Tides 2023 NJSLA 2.movTotal solar eclipses are very rare. There will likely have a question or two about solar eclipses given that the US has experienced two total solar eclipses in the past 7 years. A solar eclipse can ONLY occur at one phase -- a new moon phase. This means you probably need to have watched Video #1 to know something about the new moon phase.
We doubt they'll ask about tides, but NJ does have 130 miles of scenic coastline.
Changes in Matter NJSLA 2024.movSimply put, chemistry is the study of matter. Matter is anything that has mass and takes up space (volume). Look around the room, everything you see is matter with the exception of sunlight through the windows or light from the bulbs above. Light is energy. Matter can undergo physical changes and chemical changes. Know the difference between both.
NJSLA Conservation of Matter 2024.movWhoa!! This is so important. We don't create matter nor destroy it. Know this. Chemical changes in matter are called chemical reactions. This video explains the chemical reaction when baking soda is mixed with vinegar. Get a handle on what products and reactants are. But know for sure that the atoms before and after the reaction are the same. They just hooked up (bonded) into different molecules.
NJSLA Thermal 2024 1.movWhat does temperature really measure?
Do you remember adding drops of red and blue food coloring to a beaker with hot water and doing the same with a beaker of cold water? The food coloring mixed much faster in the hot water. It went purple within a matter of seconds.
Temperature measures the average kinetic energy of the particles (atoms/molecules) within a thing. Kinetic refers to motion. Motion can be particles in a liquid swimming around each other. They can also be particles vibrating faster while locked in place as a solid. If something heats up, the kinetic energy of its particles increases. If it cools down, those particles will have a decrease in their kinetic energy.
NJSLA 2024 Thermal 2.movMost of you think of heat when hearing the term thermal energy. Heat is actually a transfer of thermal energy from warmer objects to cooler objects. Remember the warmer-to-cooler thing.
NJSLA 2024 Thermal #3.movClose to the end of those Practice Test questions regarding that washer on a string. Ooof.
This explains Question #20 on the first practice test. They asked for an extended answer if you'd placed the hot washers in 60 ml of water instead of 30 ml. So we told you to skip it. Here is what they are looking for.
