Today is: Thursday, September 15th

Transcription

1 Today is: Thursday, September 15th 9/15/2016 #thinkaboutitthursday 1. What does this rebus puzzle mean? 2. Riddle: I m tall when I m young and short when I m old. What am I? Agenda: Volume, Mass, Weight, Density Science News: What happens when you re struck by lightning? 3. What is lightning? What happens when you are struck by lightning? Summarize today s news in 3 complete sentences. Last Class: Kahoot Classification of Matter Quiz Next Class: Density Lab Learning Target: I can explain and calculate density.

2 Physical Properties of Matter Volume, Mass, Weight, Density

3 I am able to identify: matter based on physical/chemical properties, the evidence of a physical/chemical change and how the transfer of energy affects the physical/chemical properties of matter In addition to mastering level 3, I make in-depth inferences and applications that go beyond what was taught in class. I am able to classify: I can define the following terms: Physical properties (states, density, boiling point, melting point, solubility) Chemical properties (reactivity, ph, acid/base/neutral, oxidation) Physical Changes (i.e., phase change) Chemical Changes (i.e., color change, endothermic, exothermic, generation of a gas, precipitate) I am able to explain: how the transfer of energy can affect the physical/chemical properties of matter. 1 Physical property State (solid, liquid, gas) Density Boiling point Melting point Solubility Physical Change Phase change Chemical property Reactivity ph, acid, base, neutral oxidation (corrosion) Chemical reaction Color change Generation of gas Precipitate Endothermic reaction Exothermic reaction With help, I can perform at level 2.

4 Volume and Mass Some physical properties of matter can be measured exactly. Two such properties are volume and mass. Volume is the amount of space a substance occupies. is typically measured in cubic centimeters (cm3) or milliliters (ml). Mass is the amount of matter that makes up a substance. is typically measured in grams (g) or kilograms (kg).

5 Physical Property Can be observed or measured without changing the chemical identity of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, and many others.

6 Weight Usually, if people ask you how much you weigh, they really mean to ask what your mass is. The weight of a substance is determined by two factors: the mass of the substance AND the force of gravity acting on it. For example, astronauts walking on the Moon have the same mass they have on Earth, but their weight is much lower because the Moon s gravity is weaker than Earth s. If you went aboard the International Space Station, your mass would be the same but you would be practically weightless. Because weight changes with location, it is not considered to be a property of an object.

7 If you throw a rock into a pool, what will happen? What if you throw a piece of wood? Why do you think this happens?

8 Big Density

9 Density Density is defined as the ratio between mass and volume. It is a measure of the degree of compactness of a substance.

10 Density Density is a physical property of a substance. The density of a substance is the relationship between the mass and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume. D = m/v. Objects with the same volume but different mass have different densities. Water has a density of 1 g/cm3.

11 mass Density volume

12 What state of matter d o you think is the LEAST DENSE? why? Solid Liquid Gas

13 How do hot air balloons work? Place your screenshot here

14 Energy transfer affects physical properties of air inside a hot air balloon because the air's density increases and decreases with addition or reduction of heat/energy. Place your screenshot here

15 Practice calculating d ensity 1. What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 5 cm3? 2. What is the density of an object with a mass of 120g and a volume of 6mL? 3. A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water? (volume = L x W x H)

16 Academic Lab

17 Adopt an Element Project Element Cards *Due AcLab the last week of Q1.*