Plant Kingdom Questions

Density (g/cm
Substance
Identifying an Unknown Moterial by its Physical Properties
Melting Point (c)
2.17
Mass (9)
Color
801
Table salt
14.5
white
1.53
148
Sugar
11.5
white
2.16
Baking soda
50
16.0
white
2.17
Unknown
801
white
16.0
LAB Manager
Skill Practi

Biology

Plant Kingdom

Density (g/cm Substance Identifying an Unknown Moterial by its Physical Properties Melting Point (c) 2.17 Mass (9) Color 801 Table salt 14.5 white 1.53 148 Sugar 11.5 white 2.16 Baking soda 50 16.0 white 2.17 Unknown 801 white 16.0 LAB Manager Skill Practice: How can you calculate density? SC.8.P.8.3 Physical Lab: Identifying Unknown Minerals LAFS.68.WHST.1.2. LAFS.8.SL.1.1, SC.8.N.1.1, SC.8.N.1.5, SC.8.P.8.3, SC.8.P.8.4 Identifying Matter Using Physical Properties Physical properties are useful for describing types of matter, but they are also useful for identifying unknown substances. For example, look at the substances in the table above. Notice how their physical properties are alike and how they are different. How can you use these properties to identify the unknown substance? You cannot identify the unknown substance by its color. All of the substances are white. You also cannot identify the unknown substance by its mass or volume. Mass and volume are properties of matter that change with the amount of the sample present. m Photography/Digital NGSSS Check Metal Density (g/cm”) 2.70 Aluminum Zinc 713 Recall that melting point and density are properties of matter that do not depend on the size or the amount of the sample. Therefore, melting point and density are more reliable for identifying an unknown substance. Notice that both the melting point and the density of the unknown substance match those of table salt. The unknown substance must be table salt. Iron 7.87 Copper 8.96 6. Use the table above to determine the identity of a substance with a mass of 108 g and a volume of 40 cm. SC.8.P.8.3 When you identify matter using physical properties, consider how the properties are alike and how they are different from known types of matter. It is important that the physical properties you use to identify an unknown type of matter are properties that do not change for any sample size. A cup of salt and a spoonful of salt will have the same melting point and density even though the mass and volume for each will be different. Therefore, melting point and density are physical properties that are reliable when identifying an unknown substance. a

Chapter 2: The Awakening
...Today, what is a tenement?...It is generally a brick building from four to six stories high on the street,
frequently with a store on the first floor which, when used for the sale of liquor, has a side opening for the
benefit of

Biology

Plant Kingdom

Chapter 2: The Awakening ...Today, what is a tenement?...It is generally a brick building from four to six stories high on the street, frequently with a store on the first floor which, when used for the sale of liquor, has a side opening for the benefit of inmates and to evade the sunday law, four families occupy each floor, and a set of rooms consists of one or two dark closets, used as bedrooms, with a living room feet by ten. The staircase is too often a dark well in the centre of the house, and no direct through ventllation is possible, each family being separated from the other by partitions. Frequently the rear of the lot is occupied by another building of three stories high with two families on a floor... The statement once made a sensation that between seventy and eighty children had been found in one tenement. It no longer excites even passing attention, when the sanitary police report counting 101 adults and 91 children in a Crosby Street house, one of twins. built together. The children in the other, if I am not mistaken, numbered 89, a total of 180 for two tenements! Or when a midnight inspection in Mulberry Street unearths a hundred and fifty "odgers sleeping on filthy floors in two buildings. Spite of brown-stone trimmings, plate-glass and mosalc vestibule floors, the water does not rise in summer to the second story, while the beer flows unchecked to the all-night picnics on the roof. The saloon with the side-door and the landlord divide the prosperity of the place between them, and the tenant, in sullen submission, foots the bills.

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