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1332

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Chemistry

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Feb 20, 2024

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Chapter 1 - Problems Name (legibly):______________________________ Measurement Simple 1. What volume is shown here? (in mL) a) b) c) https://www.thoughtco.com/measurement-test-questions-reading-a- meniscus-604122 2. What length is shown below in blue in cm? What length is shown below in inches? P a g e | 1

Chapter 1 - Problems Name (legibly):______________________________ Medium 1. Show 50 mL 2. Show 136 mL 3. Show 47 o Complex In each situation show the appropriate measuring device and reading. 1. Show how you would measure 32.7 mL 2. Show how you would measure 8.6 cm 3. Show how you would measure 159 mm 4. Show how you would measure 2.3 mL 5. Show how you measure 72.6 o C Units Simple 1. Fill in the table: Prefix Symbol Multiplies (or “means” kilo c m 10 -6 nano p 10 -1 M femto P 10 -12 T giga P a g e | 2

Chapter 1 - Problems Name (legibly):______________________________ Medium 1. Fill in the table, convert the units: 32 o F o C K o F 100 o C K km 3.254 m pm 2.68x10 -7 ng g Pg GL L 8.9x10 3 TL  s 15 s ds 2.6x10 11 in cm ft days 7.23 months Years Pints quarts 5.27908x10 -3 gal 20 min hours days ft 0.0020 miles kmiles 2. Use a prefix multiplier to write each number or write in scientific notation with no prefix: Problem Answer Significant figures (single digit) 345g/456L= 8.145/6.3= 45.321 x 1.8/ 6.27x10 9 = 0.0009m x 72m x 9.0678x10 2 m= 0.0006 + 0.0899= 2.5-1.77777= 36.45-1.3 x 10 -2 = 532+7.3-50.555= P a g e | 3

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Chapter 1 - Problems Name (legibly):______________________________ Complex 3. Use a prefix multiplier to write each number or write in scientific notation with no prefix: problem answer Significant figures ((2.3 x 10 6 )/4.89 x 10 5 ) + 8.22= (567.99 - 121.3)/1.4= (68889 + 78-6.5) x 9.2 x 10 12 = (2.8 x 10 8 /9.5544) – 136.92= (111/10) + 4.55= The Mole Simple 1. Define a mole. 2. What is the difference between a mole and an atom? 3. What is the molar mass of carbon? 4. What is the molar mass of helium gas? 5. How many atoms in 4.6 moles of carbon? 6. How many moles of cobalt contain 4.987 x 1026 cobalt atoms? Medium Complete the table Grams of element Molar mass element Moles of element Atoms of element 32g Manganese 2.3 x 10 -5 moles Zr 2.2 x 10 22 Atoms of gold 53 mg carbon 25.8 mol W 4.984 x 10 28 atoms Ar 500 kg He P a g e | 4

Chapter 1 - Problems Name (legibly):______________________________ Complex 1. Copper has a density of 8.96 g/cm3. A copper cube is 25 mm on a side. How many moles of copper are in the cube? 2. How many atoms of copper are in the above cube? 3. A grape has a mass of about 5.1 grams on average. An average car has a mass of 1000 kg. How many cars do you need to have the same mass as a mole of grapes? 4. A nickel has a thickness of 1.95mm. How many miles high is a mole of nickels if a mile is 5280 feet. 5. If I have a mole of carbon, how many moles of electrons do I have? If the mass of an electron is 9.10938 x 10-28 grams, how much do the electrons contribute to the mass of a mole of carbon? 6. How many moles of neutrons are in 17.8 grams of titanium? 7. If the mass of a neutron is 1.67493 x 10 -24g, how many grams of neutrons are in the 17.8 grams of Ti if there are 24 neutrons/Ti atom? P a g e | 5