CHEMISTRY REVIEW
This is for all the Chemisrty people: TEST REVIEW
- Law of conservation of mass- the fact that matter can be neither created nor destroyed in a chemical change
- energy - the capacity to do work
- chemical property - can be observed only when there is a change in composition of a substance
- exothermic - any chemical rection that gives off energy
- properties - the behavior of matter and its characteristics
- solute - the material thats is dissolved in a solution
- formula - the combination of chemical symbols that describes the compostion of a substance
- compound - a chemical combination of 2 or more elements joined together in a fixed proportion
- quantitative - an observation that makes use of measurement
- physical change- the type of change in which the identity of substance does not change
- aqueous solution - solutions in hich water is solvent
- alloy - a solid solution usually consisting of 2 or more metals
- mass- the measure of the amount of matter that an object contains
- matter - anything that takes up space and has mass
- short answer:
-rubbing alcohol evaportaing form the skin - physical change b/c only physical state of alcohol is changing
- iron rusting - chemical change. new substances are being formed on the iron
- charcoal burning - chemical change b/c the cahrcoal is being burned separating the elements
- an icicle melting - physical change only state is being changed
- CHART QUESTIONS
- if you were given a milliliter of copper and a milliliter of silver, which would weigh more? silver
- which of these substances liste has the greatest density? lowest density? tungsten is greatest, hydrogen is lowest
- corks are used on fishing lines b/c they float. What can you say about the density of cork? its less then 1.00g/mL which is less than the density of water
- to complete the list, calculate teh density for carbon dioxide if 250.0 mL of the gas has a mass of 0.4997 g. - 0.0019988 g/mL carbon dioxide
- MULTI. CHOICE
- how many atoms are in one unit of sodiun sulfate, Na2SO4? 7
-if 14 atoms of carbon react with 28 atoms of oxygen toform carbon dioxide, how many atoms are contained in the carbon dioxide that is produced? 42