Unit 2 Review

Matching Matter- k. Anything that has mass and takes up space Atom- i. the smallest unit of an element that maintains the properties of the element Element- L. substance that cannot be separated or broken down into smaller substances, 1 type of atom

Matching Compound- d. substance made up of atoms of 2+ elements joined by bonds Mixture- m. combo of 2+ substances not chemically combined Heterogeneous Mixture- mixture that you can see parts or layers Homogeneous Mixture- e. has uniform composition or structure

Matching Density- g. the ratio of mass to volume of a substance Malleability- o. ability to change the shape of a substance Viscosity- a. resistance of gas/liquid to flow Physical Property- n. describes appearance of matter

Matching Chem. Properties- c. describes the behavior of matter Chem. Changes- h. change of color, odor, heat/light given off, fizzing/foaming Physical Changes- j. change of state, shape, size or dissolving

Last Matching Qualitative Data- b. data taken with the senses Quantitative Data- f. data taken in terms of numerical values

Short Answer 1. Things that are matter: AirHelium

Short Answer 16. The building block of matter is an atom. 17. Density is the relationship between mass and volume. 18.The formula for density is D= m/v –The units for density are g/mL or g/cm The formula for volume is v=m/D –The units for volume are mL or cm 3

Short Answer 20. The formula for mass is m=DV –The units for mass are g 21. Element Compound Heterogeneous Mixture Homogeneous Mixture

Short Answer 22. Chemical or Physical Property –Malleable- physical property –Strength- physical –Flammability- chemical –Hardness- physical –Reactivity- Chemical –Density- physical –Color- physical –State- physical

Short Answer 23. Chemical or Physical Change –Color- chemical change –State- physical –Shape- physical –Smell- chemical –Fizz/Foam- chemical –Gas Given off- chemical –Light/Heat given off- chemical

Word Problems 24. Find the density of a liquid with a volume of mL and a mass of g. 25. If the density of brass is 8.15 g/mL, calculate the mass of a brass block whose volume is 67 mL.

Word problems 26. A flask weighting g is filled with neon gas. The combined mass of the gas and the flask is found to be g. Calculate the volume of neon in the flask of the density is g/mL

Word Problems 27. A certain kind of gas has a density of 3.2 g/mL and a mass of 60 g. What’s the volume? 28. A solid measures at 4.25 cm long, cm high, and 5.31 cm wide. The mass of the solid is 65.4 g. calc. the density.

Essay 29. What happens to density when you change only volume? –Density and volume are inversely proportional, when one goes up the other goes down. 30. What happens to density when you change only mass? –Density and mass are directly proportional, when one goes up so does the other.

Inversely proportional Directly Proportional

Essay 31. Explain why changes of state are physical changes. –Changes of state are physical because they do not change the formula or identity of the substance. They also do not make a whole new substance and can be reversed.

Essay 32. Explain why physical changes can be easily reversed but chemical ones cannot. –You can easily change the shape, size, state of a substance just by heating it up or putting it back together. You can’t reverse the burning of a marshmallow back to the original.

Essay 33. Use the picture to describe the properties and changes that are occurring:

Essay 34. Describe how you would take the density of a solid, liquid, gas. -Take the mass using a triple beam for all -Solid- displacement if it’s a funky shape, LxWxH if it’s a regular shape -Liquid- graduated cylinder -Gas- displacement of water

Essay 35. Explain how you know the difference between an element, compound, heterogeneous mixture and homogeneous mixture. –Elements and compounds have symbols or formulas, pure substances, cannot be separated physically. –Mixtures can be separated physically, you can see parts of a heterogeneous, looks all the same on a homogeneous.

Labs Measurement Lab- learned how to measure correctly Bunsen Burner lab- learned how to properly and safely light a bunsen burner Density of Water- how mass and volume are related (slope!) Density of A Solid- how to take the length, width, and height to find volume for density

Labs Density of Liquids- how to take the mass and volume of a liquid using the graduated cylinder (meniscus) Density of a Gas- displacement of a gas to find volume, subtract before and after to find mass Chemical/Physical Changes- identify a change as chemical or physical