5/17/2023 0 Comments Erlenmeyer flask vs beakerPhysical Physical Properties □ Def: Properties that can be seen without changing the identity of the substance. Physical Change □A change in the physical property of a substance □The chemical properties remain the same □Ex: ice to water, carving wood…Īny characteristic that can be observed or measured is a physical property. Mass Before Mix (g) Mass After Mix (g) With Balloon On (Closed System) Mass After Mix (g) With Balloon Off (Open System) Container & Water Alka Seltzer & Balloon Container, Water, Alka Seltzer, & balloon Container, Water, Alka Seltzer Mass of Container:_ Mass of balloon:_ Mass of Container & balloon: _ Mass of Container:_ Mass of Water:_ Mass of Alka Seltzer:_ Mass of Mixture:_ Mass of Mixture:_ Total Mass Before MixTotal Mass After Mix Mass of Water + Alka Seltzer = _ Mass of Water + Alka Seltzer = _ Calculate Change in Mass (Δm = m f - m i ) Δm (closed system) =_ Δm (open system) =_ Mass Before Mix (g)Mass After Mix (g) Container & WaterSalt & DishBeaker & Water & Salt Mass of Container:_Mass of Dish:_Mass of Container:_ Mass of Water:_Mass of Salt:_Mass of Mixture:_ Total Mass Before MixTotal Mass After Mix Mass of Water + Salt = _Mass of Water + Salt = _ Calculate Change in Mass (Δm = m f - m i ) Δm =_ Hypothesis: I predict that the mass will _ Procedure: 23 Salt & Water Lab Purpose: to determine what happens to the mass of the system when salt is added to water. What happens to the mass of our system when we mix substances? When salt dissolves in water, the volume decreases! Why? Where does the water go? Volume increases What if ice melts, does it’s volume decrease? Does its MASS increase or decrease? Water freezes? What happens to the volume of water as it freezes into ice? It expands. MASS Is mass a reliable measurement? Can we be certain of it? Is mass more reliable than volume? Does it change ? Lets find out? Systems System – Well-defined group of objects or materials Open System – System that continuously interacts with its environment Closed System – System in which no mass may be transferred outside or inside the system boundaries 18 What happens when we add heat? ◦V◦V ibrations increase ◦A◦A t a certain temp they have enough energy to disrupt the fixed positions (changing the phase) ◦A◦A dding heat: SSolid Liquid Gas Particles Submicroscopic particles are able to vibrate about their fixed positions. Solid -Holds Shape -Fixed Volume Liquid - Shape of container -Fixed Volume Gas -Shape of Container -Volume of Container Phases of Matter Identify which box represents a solid, liquid or gas. Predict what will happen when we light the candle 3. Inferences are hypotheses based on observations InferencesĮxample Inference ◦ “The material looks like grass.” Observation ◦ “The material is green.”Ĭandle Mini-Lab Make observations about the following situations: 1. Audible Information ◦ Sounds, bubbling, fizzing, etc… Olfactory Information ◦ Smells, aromas, etc… Tactile Information ◦ Texture, hardness, temperature, etc…. Observations Visual Information ◦ Colors, movement, light intensity, etc. Where did chemistry begin? ◦ 100,000 years ago (Earth Dwellers discovered fire) ◦ Egyptian used wine making (chemical fermentation process) Metals Dyes, glass, pottery, embalming fluidsĬhemistry Chemistry has 5 major divisions ◦ Physical chemistry (uses theories of physics such as thermodynamics) ◦ Analytical chemistry (identifies what substances are present in materials) ◦ Organic chemistry (study of compounds that contain carbon) ◦ Inorganic chemistry (study of non-living compounds) ◦ Biochemistry (uses theories of biology and living organisms (respiration, digestion, photosynthesis)) Write down 2 “jobs” that someone could have that uses chemistry.Ĭhemistry The study of the composition and structure of matter (anything that has mass) and the chemical reactions by which substances are changed into other substances. Ring clamp ring stand test tube clamp bunsen burner clay triangle test tube holderĬrucibleevaporating dishmortar and pestle watch glass thermometer rubber stoppersīell Ringer Write down 5 things that come to mind when you hear the word chemistry. Test tube holder Beaker tongs Crucible tongs wire gauze beakers Erlenmeyer flask Graduated cylinders Test tube."- Presentation transcript:īeakers Erlenmeyer flask Graduated cylinders Test tubeįunnel wash bottle test tube brush scoopulamicrospatula glass stirring rod Presentation on theme: "Lab Equipment Overview.
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