Chem 103 exam 1 stuvia - Study guides, Class notes & Summaries

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What is chemistry? - ANSWERChemistry is the study of the physical and compositional changes of matter. Chemistry is called the Central Science. Many health related areas of study are based on Chemistry. Matter - ANSWERMatter is anything that has mass, occupies space and is made-up of atoms or parts of atoms. Mass - ANSWER-Mass is a measure of the amount of matter in an object. -Mass is independent of the location of an object. -An object on the earth has the same mass as the same...

Which of the following statements about a beaker is/are true? - ANSWERA 50 mL beaker is more precise than a 250 mL beaker. Which of the following glassware does not have volume markings that increase from the top to bottom of the instrument? - ANSWER100 mL Volumetric Flask Which of the following is not a good balance practice? - ANSWERPress the Tare button when you are about to take a mass reading. A new measuring device has markings every 0.01 mL. Which of the following would be an app...

When making observations, what are the things you should describe? - ANSWERsmell, appearance, and state of matter of chemicals before and after the reaction, how long the reaction occurred, and names of chemicals What is the density of a substance? - ANSWERThe amount of matter contained in a specific sized sample of that substance; mass per unit of volume Will the density of a given substance always be the same despite the volume (as long as the are under the same specific set of condition...

accuracy - ANSWER-describes how close a measurement is to the actual value precision - ANSWER-describes how closely repeated measurements agree with each other significant figures - ANSWER-1. all nonzero numbers are significant 2. zeros that appear between nonzero digits are significant 3. leading zeros are NOT significant 4. trailing zeros are significant IF there is a decimal point, but NOT significant if there is not a decimal adding/subtracting sig figs - ANSWER-least number of d...

Accuracy - ANSWER-describes how close a measurement is to the actual value Precision - ANSWER-describes how closely repeated measurements agree with each other List all rules for counting Significant Figures - ANSWER-A. All nonzero digits are significant: 4.356 has 4significant figures B. Zeros that appear between nonzero digits are significant: 98.003 has 5 significant figures C. Leading zeros (those that appear at the beginning of a number) are notsignificant: 0.0034 has 2significant ...

Aluminum - ANSWER-Al Antimony - ANSWER-Sb Argon - ANSWER-Ar Arsenic - ANSWER-As Barium - ANSWER-Ba Beryllium - ANSWER-Be Bismuth - ANSWER-Bi Boron - ANSWER-B Bromine - ANSWER-Br Cadmium - ANSWER-Cd Calcium - ANSWER-Ca Carbon - ANSWER-C Chlorine - ANSWER-Cl Chromium - ANSWER-Cr Cobalt - ANSWER-Co Copper - ANSWER-Cu Fluorine - ANSWER-F Gold - ANSWER-Au Helium - ANSWER-He Hydrogen - ANSWER-H Iodine - ANSWER-I

Accuracy - ANSWER-how close a measurement is to the true value Precision - ANSWER-a measure of how close a series of measurements are to one another All nonzero digits - ANSWER-are significant Zeros that appear in-between non-zero digits - ANSWER-are significant Leading Zeros are _____________ significant - ANSWER-never Trailing zeros are - ANSWER-Significant ONLY if the decimal point is specified adding and subtracting sig figs - ANSWER-least number of DECIMAL places multip...