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# 7th Grade Ch. 1 Sec. 2 Measuring Matter

## on Jan 07, 2011

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## 7th Grade Ch. 1 Sec. 2 Measuring MatterPresentation Transcript

• Ch. 1 Sec. 2 Measuring Matter
• weight depends on force of gravity
• mass Unlike an object’s weight, an object’s mass will not change if the force of gravity on it changes.
• definition formula SI units mass measure of how much matter an object contains kilogram (kg) gram (g) volume amount of space that matter occupies length X width X height (l . w . h) cm 3 (solids) liter (L) milliliter (mL) density measure of how much mass is in a given volume mass volume g/cm 3 g/mL
• Volume is found by multiplying the measurements of length, width, and height. L x W x H Answer = cubic centimeters (cm 3)
• How can you measure the volume of an object with an irregular shape, such as a rock? One way is to put the object in a graduated cylinder containing water and measure the change in the volume of the water. Answer is in mL not cm 3
• density density of water = 1.0 g/mL (1.0 g/cm 3 )
• A small block of wood floats on water. It has a volume of 25 cubic centimeters and a mass of 20 grams. What is the density of the wood? Density= Mass Volume Density= 20 g 25 cm 3 Density= 0.8 g/cm 3
• Density Problems Coin Mass (g) Volume (cm 3 ) Density (g/cm 3 ) A 2.5 g 0.5 cm 3 B 4.8 g 0.08 cm 3 C 7.2 g 2.4 g/cm 3
• Activity pg. 28 - Making Sense of Density Object Mass (g) Volume (cm 3 ) Density (g/cm 3 ) Whole Wooden stick Piece 1 Piece 2 Whole Modeling clay Piece 1 Piece 2 Whole Crayon Piece 1 Piece 2 Rock Marble
• Time to review
• 1.0 g/mL (1.0 g/cm 3 ) density of water
• weight depends on force of gravity
• mass Unlike an object’s weight, an object’s ____ will not change if the force of gravity on it changes.
• mass measure of how much matter an object contains
• volume amount of space that matter occupies
• density measure of how much mass is in a given volume
• Which liquid has the greatest density? Water, corn syrup, or vegetable oil? Hypothesis: I predict that the ________ will have the greatest density because _______________. Observations: ______________ Before After 3. Corn syrup 2. Water 1. Vegetable oil 3. 2. 1.
• Matter of Density Object Floats or sinks Density compared to water Marble Wood Ironwood Japanese yen Granite Pumice rock Penny