Assignments

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26	27 conversion factor 11:59 PM 1.(6.02 x 10 ^23) (8.65 x 10^4) 2. (6.02 x 10 ^23) (9.63 x 10 ^2) 3. 5.6 x 10^–18/ 4. (6.02 x 10 ^23) (–5.11 x 10 ^–27) 8.9 x 10^8 11:59 PM quiz 1 3:05 PM	28 Convert this number into scientific notation: 0.068 3:05 PM	29 How many significant digits are in each of the following examples? 1) 47.1 2) 9700. 3) 0.005965000 4) 560 5) 0.0509 6) 701.905 7) 50.00 8) 50.012 9) 0.000009 10) 0.0000104 11:59 PM . The rule of scientific notation is to write all exponents with a base of ____. 3:05 PM	30 How many significant figures are in each measurement? A) 22 metersticks B) 0.070 80 m C) 98,000 m 3:05 PM scientific notation 11:59 PM	1 A measure of how hot or cold something is; specifically a measure of the average kinetic energy of the particles in an object. 11:59 PM	2
3	4 temperature conversion using google app 11:59 PM A temperature scale in which water freezes at 0°C and boils at 100°C. 11:59 PM	5	6	7	8 What is the formula for density? 11:59 PM	9
10	11	12 1. The density of silver (Ag) is 10.5 g/cm3. Find the mass of Ag that occupies 965 cm3 of space. 2. A 2.75 kg sample of a substance occupies a volume of 250.0 cm3. Find its density in g/cm3. 3. Under certain conditions, oxygen gas (O2) has a density of 0.00134 g/mL. Find the volume occupied by 250.0 g of O2 under the same conditions. 4. Find the volume that 35.2 g of carbon tetrachloride (CCl4) will occupy if it has a density of 1.60 g/mL. 11:59 PM	13	14	15	16
17	18 Post your Lab report Here 11:59 PM	19 What characteristics identify a substance? 11:59 PM	20 https://www.albert.io/assignment/015f2242-8a68-4cf8-8601-51fb4e0a91ae 11:59 PM What distinguishes physical properties from chemical properties? 11:59 PM	21 Which of the following is not evidence of a chemical reaction? 3:05 PM 1 An 18-g sample of element A combines completely with a 4-g sample of element B to form the compound AB. 2What is the mass of the compound formed? 2 Ibuprofen has the chemical formula C13H18O2. It is 75.69% carbon, 8.80% hydrogen, and 15.51% oxygen. How many mg of carbon does a 200.0-mg tablet of ibuprofen contain? 3The chemical formula for baking soda is NaHCO3. A 168.02-g sample of baking soda contains 45.98 g of sodium, 2.02 g of hydrogen, 24.02 g of carbon, and 96.00 g of oxygen. What is the mass percentage of each element in baking soda? 3:05 PM	22 physical and chemical properties 11:59 PM A 17.0-g sample of ammonia, NH3, contains 3.0-g of hydrogen. What percentage of ammonia is hydrogen? How many grams of nitrogen does the sample contain? 11:59 PM	23
24	25 Which of these is not a homogeneous mixture? 3:05 PM	26	27 --------------------------------- is a separation technique that produces highly pure solids. 11:59 PM Explain why the rusting of an iron bar decreases the strength of the bar. A pat of butter melts and then burns in a hot frying pan. Which of these changes is physical and which is chemical? 11:59 PM	28	29	30
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