physical science fact sheets · Physical Science Fact Sheet 1 – SOLs 2-4 SOL 2: Classification of...

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Physical Science Fact Sheet 1 – SOLs 2-4 SOL 2: Classification of Matter All matter is made of particles called atoms. o An element is a pure substance made of 1 type of atom that cannot be broken down further. o A compound is a pure substance made of more than 1 type of atom chemically combined. § Organic compounds have C and H. o A mixture is made of more than one substance physically combined and can be separated. Physical Properties are observed or measured without changing the identity of the substance. Example Physical Properties: Mass, Volume, Melting point, Boiling point, Luster (Shininess), Malleability (Bendable), Conductivity, Density (Mass/Volume), Solubility (Dissolving), and any other properties detected by your 5 senses. Chemical Properties make a new substance when measured. Example Chemical Properties: Combustibility (Burning), Rust, Tarnish, Reactivity, Acidity, Basicity, and pH. SOL 4: Periodic Table Periodic table is arranged according to atomic number or protons. The 7 Periods run horizontal (side to side) and determine the number of electron shells an atom has. o 1 st : Up to 2 electrons o 2 nd : Up to 8 electrons o 3 rd : Up to 18 electrons The 18 Groups or Families run vertical (up and down) and determine the chemical behavior or reactivity of elements. Elements in the same group or family have the same number of valence, outside electrons involved in reactions or bonds. o Family 1: 1 Valence, lose 1 to reach stability. o Family 2: 2 Valence, lose 2 to reach stability. o Family 13: 3 Valence, lose 3 to reach stability. o Family 14: 4 Valence, gain/lose 4 to reach stability. o Family 15: 5 Valence, gain 3 to reach stability. o Family 16: 6 Valence, gain 2 to reach stability. o Family 17: 7 Valence, gain 1 to reach stability. o Family 18: 8 Valence, already stable. No changes. Metals: shiny (luster), malleable, conductive elements found to the left of the staircase on the table (except H). o Alkali Metals are the most reactive metals. (Family 1) Nonmetals: dull, brittle, rigid, poorly conductive elements found to the right of the staircase on the table (including H). o Halogens are the most reactive nonmetals. (Family 17) o Noble Gases are the non-reactive elements. (Family 18) Metalloids: share properties of both metals and nonmetals, and found between the two on the periodic table’s staircase. Ionic Bond: a transfer of electrons from a metal to a nonmetal. Covalent Bond: a sharing of electrons between two nonmetals. SOL 3: Atomic Theory Earliest -- Dalton – All matter is made of atoms that cannot be created or destroyed. All atoms for an element are identical. Billiard Ball Model Thomson – Atoms are positive spheres with negative electrons embedded throughout it. Plum Pudding Model. Rutherford – Atoms have a dense positive core made of protons called the nucleus. The electrons are separate and far to the outside of the nucleus. Nuclear Model. Chadwick – Discovered that the nucleus contains uncharged particles called neutrons. Bohr – An atom’s electrons move around the nucleus in different orbits, closer or further away according to their energy. Planetary Modern – Electron Cloud – An atom’s electrons move like a particle and a wave, not keeping to neat orbits like Bohr’s theory. Protons: positive charge, in the nucleus, the atomic number. Electrons: negative charge, outside cloud, equal to protons. Neutrons: no charge, in the nucleus, mass – atomic number Ions: An atom gains (negative) or loses (positive) electrons. Isotope: An atom gains or loses neutrons. (changes mass only)

Transcript of physical science fact sheets · Physical Science Fact Sheet 1 – SOLs 2-4 SOL 2: Classification of...

Page 1: physical science fact sheets · Physical Science Fact Sheet 1 – SOLs 2-4 SOL 2: Classification of Matter • All matter is made of particles called atoms. o An element is a pure

Physical Science Fact Sheet 1 – SOLs 2-4

SOL 2: Classification of Matter

• All matter is made of particles called atoms. o An element is a pure substance made of 1 type of atom

that cannot be broken down further. o A compound is a pure substance made of more than 1

type of atom chemically combined. § Organic compounds have C and H.

o A mixture is made of more than one substance physically combined and can be separated.

• Physical Properties are observed or measured without changing

the identity of the substance. • Example Physical Properties: Mass, Volume, Melting point,

Boiling point, Luster (Shininess), Malleability (Bendable), Conductivity, Density (Mass/Volume), Solubility (Dissolving), and any other properties detected by your 5 senses.

• Chemical Properties make a new substance when measured. • Example Chemical Properties: Combustibility (Burning), Rust,

Tarnish, Reactivity, Acidity, Basicity, and pH.

SOL 4: Periodic Table

• Periodic table is arranged according to atomic number or protons.

• The 7 Periods run horizontal (side to side) and determine the

number of electron shells an atom has. o 1st: Up to 2 electrons o 2nd: Up to 8 electrons o 3rd: Up to 18 electrons

• The 18 Groups or Families run vertical (up and down) and

determine the chemical behavior or reactivity of elements. • Elements in the same group or family have the same number of

valence, outside electrons involved in reactions or bonds. o Family 1: 1 Valence, lose 1 to reach stability. o Family 2: 2 Valence, lose 2 to reach stability. o Family 13: 3 Valence, lose 3 to reach stability. o Family 14: 4 Valence, gain/lose 4 to reach stability. o Family 15: 5 Valence, gain 3 to reach stability. o Family 16: 6 Valence, gain 2 to reach stability. o Family 17: 7 Valence, gain 1 to reach stability. o Family 18: 8 Valence, already stable. No changes.

• Metals: shiny (luster), malleable, conductive elements found to the

left of the staircase on the table (except H). o Alkali Metals are the most reactive metals. (Family 1)

• Nonmetals: dull, brittle, rigid, poorly conductive elements found to

the right of the staircase on the table (including H). o Halogens are the most reactive nonmetals. (Family 17) o Noble Gases are the non-reactive elements. (Family 18)

• Metalloids: share properties of both metals and nonmetals, and

found between the two on the periodic table’s staircase.

• Ionic Bond: a transfer of electrons from a metal to a nonmetal. • Covalent Bond: a sharing of electrons between two nonmetals.

SOL 3: Atomic Theory • Earliest -- Dalton – All matter is made of atoms that cannot be

created or destroyed. All atoms for an element are identical. Billiard Ball Model

• Thomson – Atoms are positive spheres with negative electrons embedded throughout it. Plum Pudding Model.

• Rutherford – Atoms have a dense positive core made of protons

called the nucleus. The electrons are separate and far to the outside of the nucleus. Nuclear Model.

• Chadwick – Discovered that the nucleus contains uncharged

particles called neutrons. • Bohr – An atom’s electrons move around the nucleus in different

orbits, closer or further away according to their energy. Planetary • Modern – Electron Cloud – An atom’s electrons move like a

particle and a wave, not keeping to neat orbits like Bohr’s theory. • Protons: positive charge, in the nucleus, the atomic number. • Electrons: negative charge, outside cloud, equal to protons. • Neutrons: no charge, in the nucleus, mass – atomic number • Ions: An atom gains (negative) or loses (positive) electrons. • Isotope: An atom gains or loses neutrons. (changes mass only)

Page 2: physical science fact sheets · Physical Science Fact Sheet 1 – SOLs 2-4 SOL 2: Classification of Matter • All matter is made of particles called atoms. o An element is a pure

Physical Science Fact Sheet 2 – SOLs 5-7, 10

SOL 5: Changes in Matter

• Physical Changes alter the appearance of a substance, but do

not make something new. o Examples: melting, boiling, breaking, dissolving

• Chemical Changes produce a new substance through a chemical reaction.

o Examples: Burning, rusting, digesting, reacting o Endothermic (Take in heat), Exothermic (Give off heat)

• Law of Conservation of Matter: Matter cannot be created or destroyed.

• Nuclear Changes alter the center nucleus of an atom.

o Fusion: combining hydrogen into helium. (Stars) o Fission: splitting uranium atoms for energy.

§ Nuclear Power Plants, Nuclear Weapons • Nuclear Energy Pros: Efficient energy, no pollution, alternative to

fossil fuels. • Nuclear Energy Cons: radioactive waste must be safely stored.

SOL 7: Heat and Temperature

• Temperature is the average kinetic energy of a substance.

o Celsius: Water Boils (100), Water Freezes (0) o Kelvin: No negatives. Absolute Zero is 0 Kelvin.

• Heat is total energy and transfers from hotter to cooler objects.

o Conduction: Heat transfer through a solid by touch. o Convection: Heat transfer through liquid/gas by currents. o Radiation: Heat transfer through empty space by waves.

SOL 6: Energy • Energy is the ability to do work.

• Potential Energy is stored energy.

o Chemical – Energy in food, fuel, and living things. o Nuclear – Energy in the nucleus of every atom. o Gravitational – Energy of heights. o Stored Mechanical – An object ready to move.

• Kinetic Energy is the energy of motion.

o Electrical – Energy from moving electrons. o Thermal – Energy from moving atoms. (heat) o Sound – Energy from vibrations. o Mechanical – Energy from a moving object. o Radiant – Energy from electromagnetic waves.

• Law of Conservation of Energy: Energy cannot be created nor

destroyed, only transformed.

• Friction between surfaces causes a loss of energy from an energy transformation as heat. (wasted energy)

• Flashlight: chemical to electrical to radiant • Microwave: electrical to radiant • Human: chemical to mechanical

SOL 10: Force and Motion

• Speed is a change in distance over time. (d/t) • Velocity is speed with direction. • Acceleration is a change in velocity over time.

• Force is any push or pull on an object. (Newtons)

• Newton’s 1st Law: Objects at rest stay at rest, objects in motion

stay in motion, unless acted on by outside forces. (Inertia) • Newton’s 2nd Law: The greater the mass of an object, the greater

the force needed to accelerate it. o Mass: The amount of matter in an object. o Weight: The force of gravity acting on a mass.

• Newton’s 3rd Law: For every action, there is an equal and opposite

reaction force.

• Work is the use of force to move an object some distance. (Joules) • Power is the rate (how fast) at which work is being done. (Watts) • Simple Machines make work easier by changing the size or

direction of the applied force. • Ex: Wedge, Pulley, Inclined Plane, Screw, Wheel & Axle, Lever.

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Physical Science Fact Sheet 3 – SOLs 8-9,11

SOL 8: Sound Waves

• Sound has to travel through a medium. (Fastest through Solid) • Pitch is how high or low a sound is. (Determined by Frequency)

o Frequency is the number of waves per second. (Hz) • Loudness is determined by amplitude (energy of a wave). (dB)

• Echolocation is the use of echoes by animals to find objects. • Sonar is an electronic echolocation to locate objects underwater. • Ultrasounds can be used to produce images inside the body. • Resonance is the vibration of an object at its natural frequency.

o Tacoma Narrows Bridge, Musical Instruments, etc • Doppler Effect: change in pitch when a sound passes an object. • Interference: when sound waves combine.

o Constructive: produces louder sounds. o Destructive: sounds cancel each other out.

SOL 9: Light Waves

• Electromagnetic waves (light) do not require a medium to travel

through. They can travel through empty space (vacuum). • Light moves fastest through empty space -> gas -> liquid -> solid

• High frequency waves have more energy, and are dangerous.

• Light can be absorbed (taken in) or reflected off a surface. • The color of an object is determined by the light it reflects. • Refraction is the bending of light as it changes speed moving

through one medium to another. • Diffraction is the bending of light around corners. • Law of Reflection: The angle at which light hits a surface is the

same angle it bounces off.

SOL 11: Electricity and Magnetism • Static: the build up of electric charges by friction or other means.

o Like charges repel, opposite charges attract. • Static Discharge: a release of electric charge. (shock, lightning)

• Current is the rate (how fast) of flow of electric charges. (V/R) • Voltage is the amount of energy behind a moving charge. • Resistance is the opposition to the flow of moving charges.

• Conductors allow heat and electricity through easily. (Metals) • Insulators do not allow heat and electricity through easily.

o Ex: wood, plastic, rubber, paper, glass • Semi-conductors behave as a conductor and insulator.

o Ex: Silicon, germanium. (Metalloids) • Series Circuit: All devices connected in one path, all sharing the

same current. (Dimmer bulbs, Holiday Lights) • Parallel Circuit: All devices connected on their own path, each

with its own full current. (Brightest bulbs, Home circuits)

• Electromagnet: an iron core wrapped with a current carrying wire to create a magnetic field.

• Electric Motor: converts electrical energy to mechanical energy. • Generator: converts mechanical energy to electrical energy. • AC moves e- back and forth; DC moves e- in one direction.

Page 4: physical science fact sheets · Physical Science Fact Sheet 1 – SOLs 2-4 SOL 2: Classification of Matter • All matter is made of particles called atoms. o An element is a pure