Nature of Chemistry Solutions

Review for Test Unit 1: Nature of Chemistry Matching: write the letter of the definition next to the vocabulary word. 1. .L 2.L з.� 4.4-- s._h_ 6. .д_ 7.+ 8._д_ 9.--L 10.Д.. 11. _с,_ 12._Q_ 13 . ...m 14._.,R_ 15._.t 16. 4-17,L18.� Mass а. Weight Volume L xW xH Ь. с. d. Density Hypothesis Experiment Control Independent VariaЬle Dependent VariaЫe Units of volume Valid Data Quantitative е. f. g. h. i. j. k. 1. m. n. Conclusion Line Graph Bar graph Pie Graph о. р. q. r. Parts of the experiment that are kept the same throughout an experiment The amount of space an object occupies Milliliter (mL), cublc centimeter (cm 3 ) А prediction about the results of an experiment, also called an educated guess. Is а measure of the force of gravity on mass (like you), • How much matter an object contains Formula for the volume of а "regular" shaped object Mass of an object divided Ьу its volume А variaЬle that is changed Ьу the scientist (What the scientist chooses to study) А repeataЫe scientific procedure to test а hypothesis Expressed in numbers А statement reflecting the validity of а hypothesis Observations/Measurements from an experiment А variaЫe that the scientist measures as а result of the independent variaЬle Results that are consistent and accurate Used to show percentages Used to show а trend or а change over time Used to show differences between similar things Short Answers Density Chart 19. An expensive bracelet has а mass of 200.0g and а volume of 9.20cm 3 . а.) Calculate the density of the bracelet. Platinum 21.7g/cmз Gold 19.3 g/cmз 10.5 g/ сmз Silver 'i)-::- � V :: �05 t}.?.c.�� -= 2. \ .9 � Ь.) Look at the density chart and identify the metal the necklace is made of . 20. f'----,,/_/ а. Use уоuг ruleг to measuгe the height, length and width in centimeters (cm) ofthe wood Ыосk pictuгed here. Height (h) = 7 .9 t-M 2. С\ см Length (1) = Width (w) = 1 . :/ {, tvi Ь. The formula fo1· volume is (h х I х w). Calculate the volume, don't forget the uпits (cm3 )__....., ,, 2 А {.,r\l\ " 2.q(,� ')( \. L/ С,,.. -=- 11.,1 � \11. (,� \ 2. Sf 23. Name the lab equipment that should Ье used in the following situat ions: а. Ь. с. d. е. {3У'й��� ci1 \ �У\�е.... о r �rю. bl@c.e. Measuring volume of water Measuring the mass of an object Mixing two chemicals Measuring the length of an object Adding drops of water to something оf Vh:ttr-·1 t. y'\,\\CI(' f·1 24. Match all the units with the right measurements ,:ir-± Y\-\t.\U" r·· �i ri°ic:. К Units: centimeter (cm), milliliter (mL), meter (m), gram (g), millimeters (mm),Кilogram (kg), liter (L) Measurements: а. Mass Ь. Volume с. Length 25. Precision and Accuracy: А measurement was taken three times. The correct measurement was 68.1 mL. Circle whether the set of measurements is accurate, precise, both, or neither. 78.1 mL, 43.9 mL, 2.0 mL accurate precise 68.1 mL, 68.2 mL, 68.0 mL accurate precise 98.0 mL, 98.2 mL, 97.9 mL accurate �еЭ both � both � neither neither А student is given а rock that is known to have а mass of 436.8 grams. She measures the mass of the rock three different times with the following results: 460.9 g, 461.4g, 459.0 g. Calculate her precision and accuracy? a.ve. ч�о.➔ �rHлs·,m·· L/1,0.Ч � \.2 1-i.+� k.A>w = ДW,,.,,rч : "tb \."{ 1 � Jf�ei.o, " 2.4 -; J?Jfe.){�¼1,0,j,1x 1tЮ -: Z::. 1." Р ?,�О� /о �'f\f()v stu en 1ven а cube of metal tha 1s nown to ave а mass't(�S.Oirams. She measures е mass of the metal three different times with the following results: 125.1 g, 124.8 g, 125.3g. Calculate her precision and ассuгасу? "' \-\i�'koi,.., .. ,,.,;,,�-� \�ч.i') 0.5--:2: t;.)S' a,ve. \').5",1� � 1 .).5°, 1; 1, v ,;\_5\ Де,rм.v��: \'2.�.о '). 1 ).С.\.') }( \ оо .,, о/ ENO'( 26. YoError L--_;./_,o___..J 1. \ �. t,� о.�� А student buys а горе at the store. The label on the packaging says tl1at the горе is 2.15 m't"ters in length. The student t) \ • measures the горе as 1.85m. What is the student's percent еггоr? _ _ • 1(' • \ '°r - rJ e'{'l'i7{ ... \ А,+v,.м. - L=.хеи\м� " rirc.-hлм б 1)� � l W'• � )( \00 �' z • J"" t.- 2. t<' А 250.0 gram Ыосk is placed on а balance. The balance measures the mass of the Ыосk as 243.9 grams. What is the percent еггог of the Ыосk? e/l 11 •0� _ 2.'-l3• q � " \t:>O == [ 2 .�L\D /., J Ч \f erv-vr -= /о z�I) -Z,50 .о') 3. А teacher calculates the molar mass of sodium hydroxide as 37 g/щ.ol. The tгне molar mass of sodium l1ydroxide is 40 � 1::: �Find the teacher's percent еггог. -:-:1 О/, e r,-w-" fr r 1./D�/'tvw\-�1�/\"МII X(t/0 z: �О�/.-,,...,.1 7.1:, ) %'%\ � \$f' . . correct s1. g ш"fiicant figures and units. w1th er cylшd ated in gradu t each amoun Write d. mL с. ь. а. ml ml ml Ч'l. 0,...1, Write the length of each bar with correct significant figures and units. - -· - .-. ...-.. ·- 50- 50- - 50- 40 - - 4 0- - ; 50- 40- 40 - - 40 - 30 - :ю- 30- 30- 3 0- 20- 20- 20- 20- 20- 10- 10- 10- - 10- 10- о- о- - о- 50- - - - о- J.t.D 'G - - - - - - - -