cardtboard and buve no Labeling of weighi Withoeat opening the can C TYat C3c.es

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cardtboard and buve no Labeling of weighi Withoeat opening the can C TYat C3c.es s l' ell which wox comtains vhe mn samples of different ten have diderens weights If you a winera ample in one hand and an equalsized sample of a different mineral in the other hand, then in is possible to act Nke a human balance and detect that one may be heavier than the other. This is called hefting, and it in sased to estimate the relative desities of two objects. Hefi the three mineral samples provided to you, and then write sample wumbers/eters on the lines below so indicate the sample densities from least deise to most dense (Least dense (Most dense In more exact terms, density is a measure of an object's mass (in kilograma, kg) divided by its volume (how much space it takes up in cubic centimeters,cm.Density is usually expressed in units of g/cm. What is the dessity of a bon oral that is 20 cm by 25 em by 5 cm and has a mass of 0.453 kg? Show your work Geoscientists sometimes use specific gravity to help identify an unknown mineral. Specific gravity is the ratio of the density of a mineral divided by the density of distilled liquid water, which we will assume to be 1 g/cm. Specific gravity is a dimensionless number For example, the density of quartz is 2.6 g/cn, so the specific gravity of quartz is 2.6 Return to the three mineral samples that you hefted above, and do the following I. First (while they are sill dry), determine and record the mass of each sample in grams in Table A3.31 ement method to measure and record the volume of each sample (Fig. 3.18). Recall that 1 Buid milliliter (mL or ml on the graduated cylinder) equals I cubic centimeter 3. Caleulate the specific gravity of each sample 4. Identify each sample based on the list of specific gravities of some common SG OF SOME MINERALS minerals (Table A3.3.2) 2.1 Sulfur 2.6-2.7 quartz 3.0-3.3 fiuorite Mass in grams (g) Volume in cubic cm (cm) Specific avity (SG) Mineral name 3.5-4.3 garnet 4.4-4.6 barite 4.9-5.2 pyrite 7.4-7.6 galena 8.8-9.0 native copper 10.5 native silver 19.3 native gold Table A3.3.2 A3.3.1 REFLECT &DISCUSS Were your data and calculations accurate enough to be useful in identifying the samples? If ot, how could they be made more accurate?

Explanation / Answer

C) Volume of the box=(20X25X5) cubic. cm

=2500 cubic. cm

Mass of the box=0.453 kg=453 gm

Density of the box=(453/2500) gm/cubic. cm=0.1812 gm/cubic. cm

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