MCAS REVIEW-Physical Science Part 5

Activator Which is heaviest, 1 kilogram of gold or 1 kilogram of feathers? Now think how big a 1 kg bag of feathers would be. Compare it to the size of 1 kg of gold. The 1kg bag of feathers would be much bigger than 1kg of gold. This is because the density of gold is higher than that of feathers. If you had two boxes, both of the same size, and you filled one with gold and one with feathers, which box would be the heaviest?

Density Density: how compact an object is (how close together the molecules of a substance are or how much mass a substance has in a given space) Write down formula

Volume vs Mass vs Weight  Mass is the amount of matter an object contains Volume is how much space it takes  Weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it.  On the moon, you will weigh less because the gravity is less BUT you will remain the same mass because you are still made up of the same amount of matter

STOP: Kahoot (Density Quiz) After Kahoot Copy Slides 6-10 Complete fill in the blank worksheet for protons, neutrons, and electrons

The structure of an ATOM NUCLEUS: Made up of protons and Neutrons ELECTRONS: float around nucleus (Negative charge) PROTONS: Positive Charge Neutrons: Neutral charge/zero charge

Periodic Table ATOMIC NUMBER: Number of protons in the nucleus SYMBOL: Symbol of element name ATOMIC MASS: Number of Protons AND Neutrons in the nucleus

Finding the number of Neutrons In order to find the number of neutrons take the atomic mass, round it to the nearest whole number then and subtract the atomic number from it. Atomic mass – atomic number = # of neutrons 6.94 rounds to 7 7-3 = 4 Neutrons

Atom, Element, Molecule, Compound An element is a primary substance that cannot be further simplified, and consists of smaller particles called atoms. Atom is the smallest amount of an element. Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds.

Molecule vs Compound Top row all molecules but NOT compounds because they consist of the same element Bottom Row all Compounds: Made up of two elements (Hydrogen and Oxygen) ALSO a molecule because all compounds are molecules

STOP: Complete Classwork Neutrons, electrons, protons, FILL in the blank WS LINK to periodic table of elements https://starstruckworld.files.wordpress.com/2013/05/periodictablewallpaper.png

MIXTURES AND PURE SUBSTANCES Mixture is a combination of two or more pure substances where each substance keeps its own identity upon mixing. Ex: Salt water, air, relish, etc Mixtures can be separated There are TWO types of mixtures: Homogenous (same throughout) and heterogeneous (different through out) A pure substance is a type of matter which exists in its most basic or purest form and cannot be broken down further. Ex: water, gases like carbon dioxide, oxygen and metals like platinum, gold and silver. Each pure substance has its own set of unique chemical and physical properties which helps us in identifying it.

Stop: Take NEARPOD QUIZ CODE: UKJSZ

Physical Change Examples

Evidence for Chemical Change The following can indicate that a chemical change has taken place, although this evidence is not conclusive:  Change of odor.  Change of color (for example, silver to reddish-brown when iron rusts).  Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.

STOP: Complete Classwork PHYSICAL VS CHEMCIAL CHANGE WORKSHEET

Energy a gene that can be masked by a dominant gene. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another.

Kinetic Energy is energy in motion Kinetic Energy is energy in motion. Moving water and wind are examples of kinetic energy. Electricity is kinetic energy because, even though you can't see it happen, electricity involves electrons moving in a conductor. Kinetic Energy

Potential Energy Potential energy is the stored energy in an object due of its position or its configuration

STOP: TAKE NEARPOD QUIZ CODE: UHYAQ