Unit 1 Review
What are 3 safety precautions you should always take in the lab when working with a Bunsen Burner?
Answer Wear goggles Never reach over an open flame No horseplay Never point a test tube directly at you or others when heating. Don’t wear baggy clothing.
A ruler was used to measure the length of a piece of copper A ruler was used to measure the length of a piece of copper. The length of this piece of metal was 45.80 cm. How many sig figs are in this measurement? Place a bar over the estimated digit.
Answer 4 sig figs Bar over the zero
Why do we use a graduated cylinder to measure liquid volume instead of a beaker? Be specific!
Answer More increments leads to greater precision.
What unit is used to measure mass in chemistry? What units are used to measure volume in chemistry? (2)
Answer Grams (g) Cubic centimeters (cm3) or milliliters (mL)
Which of the following are physical properties? Sugar is a white, crystalline solid. Acids neutralize bases to form salt and water. Magnesium burns in a flame. The density of copper is 8.96 g/cm3
Answer Sugar is a white, crystalline solid. The density of copper is 8.96 g/cm3
List 2 intensive and 2 extensive physical properties about 25 mL of Sprite. The mass of this sample is 14.86 g.
Answer Intensive: Sprite is transparent Tastes sweet Colorless Extensive: 25 mL 14.86 g
Which of the following can be classified as pure substances? Water Sugar Koolaid Saltwater Salt Homogeneous mixtures Compounds Elements
Answer Water Sugar Salt Elements Compounds
Which of the following are chemical changes? Milk souring Sublimation Deposition Melting Fireworks being lit Cutting hair Making cookies
Answer Milk souring Fireworks being lit Making cookies
Calculate the following using the correct number of sig figs and units: 6.99 cm x 10. cm = 3 m3 /45 m2 =
Answer 70. cm2 .07 m
Calculate the following using the correct number of sig figs and units: 5.2 m + 500 m + 6.000 m = 568.2 g - .0045 g - .1 g =
Answer 511 m 568.1 g
Calculate and report your answer in scientific notation (6.2 x 103) x (3.876 x 10-5) (5.70 x 103) / (2.10 x 105)
Answer 2.4 x 10-1 2.71 x 10-2
Write the following numbers in scientific notation: 4 000 000 .000250
Answer 4 x 106 2.50 x 10-4
Write the following in standard form: 6.8 x 10-5 2.896 x 107
Answer .000068 2 8 960 000
Determine how many sig figs are in the following measurements? 10 basketball players .01000 m 1000 g
Answer 10 or 2 4 1
Determine how many sig figs are in the following measurements? 45600 mL 4.50 x 106 s 10.000 cm
Answer 3 5
Round each calculation to the number of sig figs requested. 75000 (1) 7.99992 (3) 45890 (4)
Answer 80000 8.00 45890
Which state of matter is characterized by: A definite shape and volume, particles packed very close together, vibrational movement. No definite shape and volume, particles are spread very far apart and moving fast. A definite volume, but not shape.
Answer Solid Gas liquid
Suppose you have a sample of unknown metal with a mass of 30. 00 g Suppose you have a sample of unknown metal with a mass of 30.00 g. You place this sample in a graduated cylinder filled with water to the 34.0 mL mark. The sample sinks to the bottom and the water level rises to 55.0 mL. What is the density of this sample?
Answer 1.43 g/mL
A liquid with a mass of 3. 75 g has a density of. 789 g/mL A liquid with a mass of 3.75 g has a density of .789 g/mL. What is the volume of this liquid? Would it float or sink in water? How do you know? The density of water is 1.00 g/mL.
Answer 4.75 mL It would float because the density of ethanol is less that the density of water.
Convert using dimensional analysis and report answer in scientific notation: 45 g mg
Answer 4.5 x 104 mg
Convert using dimensional analysis and report answer in scientific notation: 678 hm m
Answer 6.78 x 104 m
Convert using dimensional analysis and report answer in scientific notation: 4.28 dag Mg
Answer 4.28 x 10-5 Mg
Convert using dimensional analysis and report answer in scientific notation: 328 mL μL
Answer 3.28 x 105 μL