Warmup – Scientific Method and Matter Matter is defined as anything that a) exists in nature. b) is solid to the touch. c) is found in the universe. d) has mass and takes up space.

Warmup – Scientific Method and Matter Matter is defined as anything that a) exists in nature. b) is solid to the touch. c) is found in the universe. d) has mass and takes up space.

Warmup – Scientific Method and Matter All of the following are physical properties of table sugar (sucrose) EXCEPT a) forms solid crystals at room temperature. b) appears as crystals white in color. c) breaks down into carbon and water vapor when heated. d) tastes sweet.

Warmup – Scientific Method and Matter All of the following are physical properties of table sugar (sucrose) EXCEPT a) forms solid crystals at room temperature. b) appears as crystals white in color. c) breaks down into carbon and water vapor when heated. d) tastes sweet.

Warmup – Scientific Method and Matter A substance is said to be in the solid state if a) it is hard and rigid. b) it can be compressed into a smaller volume. c) it takes the shape of the container. d) its matter particles are close together.

Warmup – Scientific Method and Matter A substance is said to be in the solid state if a) it is hard and rigid. b) it can be compressed into a smaller volume. c) it takes the shape of the container. d) its matter particles are close together.

Warmup – Scientific Method and Matter A heterogeneous mixture a) cannot be separated by physical means. b) is composed of distinct areas of composition. c) is also called a solution. d) has the same composition throughout.

Warmup – Scientific Method and Matter A heterogeneous mixture a) cannot be separated by physical means. b) is composed of distinct areas of composition. c) is also called a solution. d) has the same composition throughout.

Warmup – Scientific Method and Matter Which of the following is NOT a chemical reaction? a) dissolution of sodium chloride in water b) combustion of gasoline c) fading of wallpaper by sunlight d) curdling of milk

Warmup – Scientific Method and Matter Which of the following is NOT a chemical reaction? a) dissolution of sodium chloride in water b) combustion of gasoline c) fading of wallpaper by sunlight d) curdling of milk

Warmup – Scientific Method and Matter Which of the following are ENDOTHERMIC changes? Explain your reasoning. a) burning match b) ice cubes melting in a cold drink on a hot summer day c) freezing ice cubes d) vaporization of dry ice (CO2) e) melting iron in a smelter f) two solutions mixed together become cold to the touch

Warmup – Scientific Method and Matter Which of the following are ENDOTHERMIC changes? Explain your reasoning. a) burning match b) ice cubes melting in a cold drink on a hot summer day c) freezing ice cubes d) vaporization of dry ice (CO2) e) melting iron in a smelter f) two solutions mixed together become cold to the touch

Warmup – Scientific Method and Matter a) Divide this list into intensive chemical, intensive physical and extensive physical properties. red 46 m b.p. of 2570oC T of 55oC liquid spherical dissolves in H2O 42 cm2 crystalline 88 g burned in air gas smooth m.p. of 1085oC shiny 2.56 g/cm3 conducts electricity malleable magnetic turned blue when mixed with a base produced a gas when mixed with acid 265 mL 52 m3 red solid formed when mixed with …

a) Divide this list into intensive chemical, intensive physical and extensive physical properties. Intensive Chemical Intensive Physical Extensive Physical burned in air red 46 m T of 55oC 88 g turned blue when b.p. of 2570oC 42 cm2 mixed with a base liquid 265 mL dissolves in H2O 52 m3 produced a gas when spherical mixed with acid crystalline gas red solid formed when 2.56 g/cm3 mixed with … smooth m.p. of 1085oC shiny conducts electricity malleable magnetic

Warmup – Scientific Method and Matter b) Compare your lists. What is common among the physical properties? i.e. What distinguishes them from chemical properties? What is different between the two lists of physical properties? What distinguishes an intensive physical property from an extensive physical property? Which physical properties were difficult/confusing to categorize? Why? What simple questions can you ask yourself to help categorize properties as chemical intensive, physical intensive or physical extensive?

b) Compare your lists. What is common among the physical properties? i.e. What distinguishes them from chemical properties? No change in chemical composition What is different between the two lists of physical properties? What distinguishes an intensive physical property from an extensive physical property? Intensive – same property throughout the piece of matter. Extensive – depends on the amount of the piece of matter Which physical properties were difficult/confusing to categorize? Why? The ones with numbers – no really quick way to figure them out, had to think about them a bit What simple questions can you ask yourself to help categorize properties as chemical intensive, physical intensive or physical extensive? Is there a change in chemical composition? Can I reverse the process using physical means? Will the property change if I change the amount?

Warmup – Scientific Method and Matter Categorize the following as homogeneous mixtures, heterogeneous mixtures, or pure substances. silver orange juice with pulp table salt pizza salad dressing soil salt water air salad brass chocolate chip ice cream Explain your reasoning. What simple questions can you ask yourself to help you choose the correct category?

Warmup – Scientific Method and Matter Categorize the following as homogeneous mixtures, heterogeneous mixtures, or pure substances. Homogeneous mixture Heterogeneous mixture Pure substance salt water orange juice with pulp silver air pizza table salt brass salad dressing soil salad chocolate chip ice cream Explain your reasoning. What simple questions can you ask yourself to help you choose the correct category? Can I separate the mixture by physical means?  yes = mixture Is the composition uniform?  yes = homogeneous mixture