Chemistry, 08.04.2020 01:30 jordynp2615
A mineral has the following properties: low hardness (can't scratch a penny), red color and streak, low specific gravity (density), nonmetallic luster, non-toxic. For what do you think this mineral might be used?a. To add weight to an outdoor toy, so that it won't blow away
b. Used as an abrasive (the sand in sandpaper, for example)
c. For electrical wiring
d. As a coloring (pigment) in makeup or paint.
Answers: 2
Chemistry, 22.06.2019 08:00
Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.
Answers: 2
Chemistry, 22.06.2019 11:00
Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean
Answers: 2
Chemistry, 22.06.2019 14:30
100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)
Answers: 1
A mineral has the following properties: low hardness (can't scratch a penny), red color and streak,...
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