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Chemistry Ava

Chemistry retake

What is Physical Change Change in form or appearance
Name 4 signs of physical change color, phase change, shape, size
What is Chemical Change? Change that creates new or different substances
What is a sign of chemical change? Heat/light or gas give off, flame, precipitate
What is the Law of Conservation of Mass/Matter Matter is always conserved during changes
What is an atom the smallest particle of matter and made up of proton, neutron and electron
What is a proton Positively charged subatomic particle, p* ,found in the nucleus of the atom
What is a Neutron neutral/no charged subatomic particle found in the nucleus of the atom
What is Electron Negatively charged subatomic particle orbitting the nucleus of the atom
What is an Element pure substance, ordered in the periodic table
Periodic Table way of organizing elements by their atomic number and similaritites
What is a Group all of the elements in the same family, or column (vertical), have the same number of valence electrons (those electrons on their outer electron shell)
What is a Period all of the elements in the same row (horizontal), have the same number of electron shells
Electron Shells where the electrons are found/held, surround the nucleus
Valence Electrons the electrons found on the outermost shell of an atom
Compound two or more DIFFERENT atoms combined together (examples: H2O & C6H1206)
Molecule two or more of the SAME atoms combined together )(example: H2, O2)
Organic Compound must contain carbon, complex compounds and found in organisms
organic Compounds always contain______________? carbon
Inorganic Compound usually do not contain carbon, simple compounds and from the Earth
Pure substance matter in which all of the atoms are the same, an element
4 types of organic compounds carbohydrates, lipids, nucleic acids, proteins
Acid tastes sour, feels oily, corrosive to metals and has a pH LESS THAN 7
Base tastes bitter, feels slippery, dissolves hair/grease adn has a pH GREATER THAN 7
Neutral neither an acid nor a base; pH of 7
pH scale of 0-14 that ranks acid and bases
what chemical changes occur during digestion? Mouth > chemical (saliva) + physical (teeth) Stomach> chemical(HCI acid) + physical ( churning)
Matter is never _________ or _________________. created or destroyed
What happens during a chemical change that does not happen during a physical change? When chemical changes occur, a new substances is formed
When water boils, how is the steam different from the water? Steam is just the gaseous form or state of water.
Phase Changes (such as water boiling) are considered physical changes. Why? There is just a change in the state of matter, water in this case. There is no new substance form, just shape, temperature
A nail rusting is considered a chemical change. why? Oxidation has occurred, which is a chemical reaction; there is a change in color and it cannot be reversed.
What is Matter anything that has mass and takes up space (volume)
Physical property characteristic that can be observed
chemical property characteristic that cannot be observed; must be tested
Is H2O on the periodic table? Why? No, because its a compound and not an element
Elements in the same___________________ have similar properties, such as amount of valence electrons group
The smallest type of matter is ____________ an atom
Matter is any material that has___________________and__________________ mass, volume
Why is O2 considered a molecule, and not a compound? because it is made of the same kinds of atoms
what kind of change is bicycle left outside rusting chemical
what kind of change is making a dent in a car door? physical
what kind of change is dissolving sugar in water? physical
what kind of change is milk going sour? chemical
what kind of change is cooking a steak? chemical
What kind of change is boiling water? chemical
what kind of change is a nail rusting? chemical
what kind of change is saliva breaking down crackers? chemical
what kind of change is tearing a piece of paper? physical
Electrons located on the outermost shell are called _______________________ ____________________ valence shells