| A | B |
|---|
| how are science abd technology related | advantages in one leads to advandages in the other |
| What are the building blocks of matter | atoms |
| in which step of the scientific method obtained thourgh the senses | making observations |
| what happens whe nthe data in an investigation don not support the original hypothesis? | you can revise or change the hypothesis/ or redo the experiment |
| what statements can be made about scientific theories | theories r never proven |
| how is 0.00078 written in scientific notation | 78 times 10 to the negative 4 |
| what are 4 centimeters equal to | .004m, or 40mm |
| what temp does water boil in celsius? | 100 degrees |
| list 3 examples of a pure substance? | carbon, hydrogen, and oxygen |
| a substance that is made up of only one kind of atom | element |
| a sustance that is made up of many kinds of atoms | solution/ compuond |
| a mixture that appears to contain only one substance | homogeneous mixture |
| name 3 examples of heterogeneous | handful of sand, soda, orange juice with pulp |
| a material that is malleableand conducts electricity is most likely | a metal |
| 3 examples of a phisycal change | broken glass, ripped papper, a painted wall |
| 3examples of a chemical change | rusting of metals, ggas forming vinegar&bking sod, burning wood |
| gas | no definite volume or shape |
| charles law | the volume of a gas is directly proportional to it's tem. in kelvin if the pressure and the number is constant |
| if the volume of a cylinder is reduced from 6.0 liters to 3.0 liters, the pressureof the gas in the cylinder will change fom kilopacals | 25 kilpascals |
| sublimation | change from a solid to gas without going to a liquid |
| what greek philospher coined what word for a tiny piece of matter that cannot be divided | Philosopher: democriticss, Word: atom |
| J.J thomson's expriments provided evidence that an atom | has electrons(negative) |
| who provided evidence for the existence of a nucleus in an atom | ernest rutherford |
| 3 subatomic particles& describe their characteristics | Protons(positive), Neutrons(neutral), Electron(negative) |
| Atomic Number | number of protons in one atom of an element |
| how do you find the # of neutrons in the nucleus of an atom | Atomic mass-atomic # |
| true statement about an atom that has a mass # of 23 | it is an Alkaline metal, hasw 3 electrons, the protons and neutrons are not equal |
| what can you assume has happenbed if an electron moves to a higher energy level? | the gain energy |
| mendeleev arranged the known chemical elements in a table according to increasing... | atomic mass |
| in a periodic table, a set of properties repeats from | row to row |
| moving form left to right across a row of the periodic table this value increases by eactly one from element to element | atomic # |
| a weighted average of the masses of an elements isotypes | atomic mass |
| the unit for atomic mass is | atomic mass unit (AMU) |
| atoms of the most reactive elements tend to have how many elecetrons | one or seven |
| what elements have stable electron configurations? | noble gases |
| typically, atoms gain or lose electrons to achieve | stable electron configurations |
| the formation of an ionic bond involves the | transferring of electons |
| a material tha is malleable and conducts electricity is most likely | metal |
| compound NaCl2, the subscrit two means what | two chlorines |
| two atoms of the same nonmetal react, they often form this molecule | diatomic |
| bond in which electrons aren't shared equally | polar covalent |
| carbon dioxdethe prefix of the 2nd word indicates that a molecule of carbon dioxide contains | 2 atoms of oxygen |
| substances that undrho chage in a chemical reaction are called | reactants |
| total amount of energy b4 & after a chemical reaction ais the same. thus, energy is | conserved |
| substance that affectsthe rate of a chemical reaction without being used in the reaction | catalyst |
| an ion with a negative charge | anion |
| energy that is in motion | kinetic energy |
| energy that is stored | potential energy |
| an educated guess | hypothesesis |
| what the data says | conclusion |
| states a fixed amountof gas at a constanst temp. the volume is inversly related to pressure | boyle's law |
| 1 KPA=1000 pascal/ unit or pressure | kilopascal |
| person that provd that all atoms have a nucleus | ernest rutherford |
| atom of a given element that have different #'s neutons and diff. mass #'s | isotype |
| many atoms bonding | polyatomic ion |
| subtance that undergoes a change into products | reactants |
| when a substance undergoes a chage | chemical change |
