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casey chem exam
studyguide
| Question | Answer |
|---|---|
| What are the radioactive elements with numbers from 90 to 103 in the periodic table called? | the actinides |
| To which group do lithium and potassium belong? | alkali metals |
| Arogon, krypton, and xenon are? | noble gasses |
| A horizontal row of blocks in the periodic table is? | period |
| A vertical row of blocks in the periodic table is? | group |
| The elements that border the zigzag line in the periodic table is? | metalloids |
| The most reactive group of nonmeatals is? | halogens |
| A positive atom is known as? | cation |
| A negative ion is known as? | anion |
| The elements of group one are all known as? | alkali metals |
| study of the composition of maerials and the changes that materials undergo is? | chemistry |
| Technology is? | application of chemical principles to prodict events |
| Basic research is? | carried out for the sake of increasing knowledge |
| Applied research is? | caried out to solve a problem |
| A physical property may be investigated by | melting ice |
| Chemical properties | include changes that alter the identity ofasubstance |
| Two features that distinguish matter are | mass and volume |
| An example of an extensive physical property is | mass |
| The particles in a solid are? | packed closely together |
| Physical means can be used to separate | mixtures |
| the symbol for the metricunit used to measure mass is | g. |
| the metric unit that is closest to a dime is? | millimeter |
| standards are chosen because they | are reproducible in another laboratory |
| a testable statemant used for making predictions are carring out further experiments is a | hypothesis |
| the unit m^3 measures | volume |
| the symbol that representsthe measuredunit for volume is? | ml |
| the SI unit for time is? | second |
| how many minutes are in a week? | 10,080 min. |
| the number of significant figures in 210 is | 2 |
| the number of significant figures in 10000000 | 1 |
| nickle-60 has | 32 neutrons |
| phosphorus-33 contains | 18 neutrons |
| what is the atomic number for aluminum? | 13 |
| atomic number indicates | the number of proton in the nucleus |
| the descovery of the electron resulted from | the cathode rays |
| what is the atomic number for aluminum | 13 |
| what does 218 in polonium-218 represent | mass number |
| sulphur-34 contains | 18 neutrons |
| gamma rays are | electromagnetic waves |
| who called the atom "atom" | democritus |
| a quantum of electromagnetic energy is called | photon |
| the number of orbitals in d is | 5 |
| the number of orbitals in s is | 2 |
| the number of orbitals in p | 6 |
| the SI offrequency of electromagnetic radiation is | hertz |
| part of the atom where electron can't be found is | nucleus |
| how many periods are their on the periodic table | 7 |
| the atomic sublevel right below 4p is | 5s |
| asingle orbital in the 3rd lvl can hold | 2 electrons |
| atoms are ---- when they are combined | more stable |
| a covalent bond results when --- are shared | electron |
| if two covently bonded atoms are identical, the bond is | nonpolar covaleny |
| the electrons involved is the formation of a chemical bond are called | valence electrons |
| most chemical bonds are | partly ionic and partly covalent |
| a neutral group pf atoms held togethyer by covalent bond is a | molecule |
| an octct is equal to | 8 |
| how many double bonds are in the lewis structure for hydrogen fluoride, HF | none |
| the electron-sea model of bonding represents | metallic bonding |
| example of a molecular formula | O2 |
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CAL
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