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:

Air Helium

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/cm3

• 19. The formula for volume is v=m/D – The units for volume are mL or cm3

Short Answer

• 20. The formula for mass is m=DV– The units for mass are g

• 21. ElementCompound

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 356.8 mL and a mass of 41003 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 390.0 g is filled with neon gas. The combined mass of the gas and the flask is found to be 413.22 g. Calculate the volume of neon in the flask of the density is 0.9002 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, 21.35 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