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Module 1 Review
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Module 1 Vocabulary Mass is measured ingrams Mass measure of the amount of substance in an object weight measure of the gravitation pull of earth on an object Volume is measured in liters chemistrythe study of matter volume measure of the amount of space occupied Distance is measured inmeters precision indication of the scale on the measuring device that was used metric systemsystem of standard units density a measure of the amount of mass per unit volume accuracy indication of how close a measurement is to the true value matter anything that has mass and takes up space
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Unit Conversions 1kg=1000g 1hg=100g 1Dg=10g 10 dg = 1g 100cg = 1 g 1000 mg = 1g
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Significant Figures Rule 1 Non zero numbers are always significant 267 has 3 Sig. Figs Rule 2 Beginning zeros are never significant 0.0001 has 1 Sig. Fig Rule 3 Middle Zeros are always significant 12006 has 5 Sig. Figs Rule 4 Ending zeros only with a decimal are significant 130.00 has 5 Sig. Figs Sig. Figs
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Scientific Notation Standard Scientific Your answer will always be between 1-9 1. 12 2. 0.156000 3. 0.00000000 If you have a small number, the exponent will be negative 0.000065 would be written as 6.5 x 10‾ ⁵ If you have a large number, the exponent will be positive 2,240,00,000 would be written as 2.24 x 10 ⁹
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Scientific Notation If the exponent is negative move the decimal to the left 6.5 x 10‾ ⁵ would be written as 0.000065 If the exponent is positive move the decimal to the right 2.24 x 10 ⁹ would be written as 2,240,00,000
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Density Volume Mass 1. Find the density of a piece of concrete of 6.120kg has a volume of 90 L Formula for density d=m/v ? Density what do I know m=6120 v=90l 2. Find the density of a block that has a mass of 108g and measures 2.0cm x 2.0cm x 9.0cm Formula for density d=m/v ? Density what do I know m=108g volume=36cm³ 3. If the element Bismuth (Bi) has a density of 9.80g/cm³, what is the mass Of 3.74 cm³ Formula for mass m=d * V ? Mass what do you know? Volume = 3.74 cm³ density 9.80g/cm³
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Density Volume Mass 4. Magnesium (Mg) has a density of 1.74g/mL. What is the volume of 56.6g Formula for volume v=m/d ?volume what do I know d=1.4g/ml, m=56.6g 5. An object with a mass of 18.73g is placed in 15.5 mL of water. The water rises to 19.0mL. What is the objects density? Formula for density d=m/v Calculate the water displacement 19.0 ml – 15.5 ml ? Volume what do I know m=18.73g v=19.0mL – 15.5 mL
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Practice problems
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7. Convert the following numbers into scientific notation A. 123.451.2345 x 10² B. 0.00030403.040 x 10‾ ⁴ C. 6,100,000 6.1 x 10 ⁶ D. 0.12341.234 x 10‾¹ 8. Convert the following numbers back into decimal A. 6.54 x 10³6540 B. 3.450 x 10‾³0.003450 C. 3.56 x 10 ⁷ 35,600,000 D. 4.050 x 10‾ ⁷ 0.00000004050
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Practice problems
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