Intro Vocab Density Problems Physical vs Chemical

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$200 $200 $200 $200 $200

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Final Question

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• Find the percent error.

• The acutal value of the density of gold is 19.32 g/mL. A student found the density in lab to be 19 g/mL

Intro$100

• What piece of lab equipment is used to accurately measure volume?

• Graduated cylinder

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Intro$200

• We know that the gas is turned off when…

• The handle is PERPENDICULAR!

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Intro$300

• To smell something in lab we…

• waft

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Intro$400

• The first step in the scientific method is…

• observation

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Intro$500

• Read to the correct number of significant figures…

• 6.61 mL

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Vocab$100

• Contrast mass and weight

• Mass = measures mass

• Weight= measures mass + gravity

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Vocab$200

• Contrast qualitative and quantitative

• Qualitative = qualities (color, shape)

• Quantitative = quantities (50 g, 10 cm)

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Vocab$300

• Define reactants and products

• Reactants = substances start with

• Products = substances end with

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Vocab$400

• Matter can be classified into these two categories

• Substances and mixtures

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Vocab$500

• Define precision and accuracy

• Precision = how close measurements are to one another

• Accuracy = how close measurements are to the target

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Density$100

• Describe the density triangle

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D V

Density$200

• How do we know if an object will float or sink?

• Float if density < 1 g/mL

• Sink if density > 1 g/mL

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Density$300

• What is the density of water?

• 1 g/mL

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Density$400

• What is the density of an object with a volume of 20 mL and a mass of 100 grams? (must include units in your answer)

• D = M / V = 100 / 20 = 5 g/mL

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Density$500

• If the following compounds were put in one container how would they separate the compounds from top to bottom

• Baby oil, vegetable oil, milk, honey

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Honey 1.42 g/mL

Vegetable oil

0.92 g/mL

Baby oil 0.83 g/mL

Milk 1.03 g/mL

Problems$100

• Convert 2.3 m to cm

• KHDUdCM 2.3 m = 230 cm

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Problems$200

• How many sig figs are in 0.0023010

• five

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Problems$300

• How would you write the following number in scientific notation? 0.000 32

• 3.2 x 10-4

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Problems$400

• Calculate the density of this irregular shaped object

• Volume object = 80-50 = 30• Density = M / V = 90 / 30 = 3 g/mL

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Volume of water 50 mL

Volume of water + object 80 mL

Mass of object 90 g

Problems$500

• Use a calculator to solve the problem but report your answer to the correct sig figs

24.010 + 30.00 + 16.822

• 70.83

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Physical vs Chemical$100

• Give an example of each– Physical PROPERTY– Chemical PROPERTY

• Physical = color, mass, weight, taste, smell• Chemical = reactivity, flammability

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Physical vs Chemical$200

• Give an example of each– Physical CHANGE– Chemical CHANGE

• Physical = tearing, crushing, phase change• Chemical = burning, digestion, rusting

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Physical vs Chemical$300

• Classify water boiling as a physical or chemical change and give reasoning

• Physical change—no new substance is formed; just a change in state of matter

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• Give 2 example of each– Intensive physical property– Extensive physical property

• Intensive = color, taste, smell, density, melting point, freezing point, boiling point

• Extensive = mass, volume, area, length, width, height

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Physical vs Chemical$400

Physical vs Chemical$500

• Give the 6 pieces of evidence from a chemical change

1. Gas 4. smell2. Color change 5. solid3. Temp change 6. light

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