Living By Chemistry SECOND EDITION

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Presentation transcript:

Living By Chemistry SECOND EDITION Unit 1: ALCHEMY Matter, Atomic Structure, and Bonding

Lesson 4: Mass Communication Mass and Volume

ChemCatalyst Which has more mass and weighs more, 5 kilograms of bricks or 5 kilograms of feathers? Explain your thinking. 2. Would it hurt more to be hit with 5 pounds of feathers or 5 pounds of bricks? Explain your thinking.

Key Question How do you determine the masses and volumes of different substances?

You will be able to: measure mass using a balance measure the volume of regularly and irregularly shaped objects

Prepare for the Lab Work in groups of four.

Prepare for the Lab (cont.) In this lab, you will be measuring volume with a graduated cylinder. To the nearest hundredth of a milliliter, the volume of liquid is 5.52 mL.

Discussion Notes Mass is commonly measured in units of grams (g) or kilograms (kg). 1 kg = 1000 g

Discussion Notes (cont.) Volume is a measure of the amount of space occupied by something. 1000 mL = 1 L Mass: A measure of the quantity of matter in an object. Volume: The amount of space a sample of matter occupies. 1 mL = 1 cm3

Wrap Up How do you determine the masses and volumes of substances? Mass is a measure of the amount of substance. Mass can be measured using an electronic or triple beam balance. Volume is the amount of space occupied by an object. The volume of a liquid can be measured in a graduated cylinder. Objects with similar volumes can have different masses, and vice versa.

Check-In A penny has a mass of 2.498 g. a. What is the mass to the nearest tenth of a gram? b. How would you determine the volume of a penny? c. What is the difference between mass and volume? d. Suppose you find that the golden penny has a mass of 2.6 g. If you compare it with the mass of this penny, what can you conclude?