Ch. 1 Test – Self Review Honors Chemistry

Pure Substance or Mixture? Determine whether each of the following is a homogenous mixture, heterogeneous mixture, element, compound. sugar water Sugar (sucrose) A bucket of marbles Gold

Pure Substance or Mixture? Determine whether each of the following is a homogenous mixture, heterogeneous mixture, element, compound. sugar water homogenous mixture Sugar (sucrose) compound A bucket of marbles heterogeneous mixture Gold element

Physical or Chemical Change? Determine whether each of the following is physical or chemical change. Boiling water Cutting a piece of bread Melting wax Baking Bread

Physical or Chemical Change? Determine whether each of the following is physical or chemical change. Boiling water physical change Cutting a piece of bread physical change Melting wax physical change Baking Bread chemical change

Match the statements Precision Accuracy Distillation Chromatography _____Separates a homogeneous solution based on differences in boiling points _____Several measurements close to one another _____Separates a mixture based on differences in solubility _____Measurements close t the true or accepted value _____Separates solid & liquid mixture based on particle size Precision Accuracy Distillation Chromatography Filtration

Match the statements Precision Accuracy Distillation Chromatography __C__Separates a homogeneous solution based on differences in boiling points __A__Several measurements close to one another __D__Separates a mixture based on differences in solubility __B__Measurements close t the true or accepted value __E__Separates solid & liquid mixture based on particle size Precision Accuracy Distillation Chromatography Filtration

Measurements & Data State whether the following data is intensive or extensive and whether it is quantitative or qualitative: The chlorine gas is green in color. The density of the substance is 1.33 g/mL 3) The volume of the helium gas is 23 cm3

Measurements & Data State whether the following data is intensive or extensive and whether it is quantitative or qualitative: The chlorine gas is green in color. intensive & qualitative 2) The density of the substance is 1.33 g/mL intensive & quantitative The volume of the helium gas is 23 cm3 extensive & quantitative

States of Matter Describe each of the three states of matter. Be sure to include a description of if they each have definite or indefinate shapes & volumes, state a distinguishing properties for each, and give 1 elemental example of each.

States of Matter Describe each of the three states of matter. Be sure to include a description of if they each have definite or indefinate shapes & volumes, state a distinguishing properties for each, and give 1 elemental example of each. Solid – definite shape & volume, partciles are closely packed in ridged order & not compressible, example = iron Liquid – indefinate shape & definite volume, particles close together & can flow, example = mercury or bromine Gas – indefinite shape & volume, fills the volume of its container & particles very far apart, example = neon

Measurements & Data State whether the following scenarios represent high accuracy and high precision, low accuracy & high precision, or low accuracy and low precision. Three volume measurements of a 4.2 mL give the following results: 2.2 mL, 3.2 mL, and 6.6 mL. The density of water at room temperature is calculated to be 1.003 g/mL, 0.999 g/mL, and 1.001 g/mL. The mass of a paper clip (actually 1.2 g) is found to be 0.55 g, 0.57 g, and 0.52 g.

Measurements & Data State whether the following scenarios represent high accuracy and high precision, low accuracy & high precision, or low accuracy and low precision. Three volume measurements of a 4.2 mL give the following results: 2.2 mL, 3.2 mL, and 6.6 mL. low accuracy & low precision The density of water at room temperature is calculated to be 1.003 g/mL, 0.999 g/mL, and 1.001 g/mL. high accuracy & high precision The mass of a paper clip (actually 1.2 g) is found to be 0.55 g, 0.57 g, and 0.52 g. low accuracy & high precision

Metric Conversions: (set them up w/dimensional analysis) 100 mm = ____________ dm 15.0 cm = _____________ km 0.65 km = _____________ m 134,076 nm = ______________ m

Answers: 100 mm = 1 dm 15.0 cm = 1.50 x 10-4 km 0.65 km = 650 m 134,076 nm = 1.34076 x 10-4 m

Significant Figures/ Scientific Notation Identify the # of significant figures and rewrite in scientific notation. 160000 160700 0.000167 160.0 0.0160

Answers: Identify the # of significant figures and rewrite in scientific notation. 160000 (2) 1.6 x 105 160700 (4) 1.607 x 105 0.000167 (3) 1.67 x 10-4 160.0 (4) 1.600 x 102 0.0160 ( 3) 1.60 x 10-2

Complete the following problems using Sig. Figs. 103.36 + 12.097 + 11 = 24.5 x 0.25 x 100.1 = (76.2 x 15) = 4

Answers: 103.36 + 12.097 + 11 = 126 ( 0 deci. places) 24.5 x 0.25 x 100.1 = 610 (2 sig. figs) (76.2 x 15) = 300 (1 sig. fig) 4

Use Dimensional Analysis and sig. figs to solve the following: If the average student walks 3.63 miles around the school in a day, how many kilometers is this? A piece of magnesium with a density of 1.74 g/cm3 is found to have a volume of 15,600 µL. What is the mass of this piece of Mg?

Use Dimensional Analysis and sig. figs to solve the following: If the average student walks 3.63 miles around the school in a day, how many kilometers is this? 3.63 mi 5280 ft 12 in 2.54 cm 1m 1km = 5.84 km 1 mi 1 ft 1 in 100 cm 1000 m A piece of magnesium with a density of 1.74 g/cm3 is found to have a volume of 15,600 µL. What is the mass of this piece of Mg? 1.74 g 1 cm3 1000 mL 1 L 15,600 µL = 27.1 g 1 cm3 1 mL 1 L 106 µL