Chemistry, 17.02.2020 00:15, emiliemon5114
1. A pure substance is a chemical substance that has the same composition throughout. There are two
types of pure substances: elements and compounds. Each pure substance has characteristics, or
properties, that can be used to identify it. Physical properties are traits that can be observed and tested
without a chemical change taking place. Some examples of physical properties are freezing point, color
and density. Metals are a group of pure substances. They are good conductors and have high boiling
points. Chemical properties describe how a substance will react during a chemical change. For example,
iron is a metal that will rust when combined with oxygen.
Which of the following does not describe a physical property of iron?
A. Iron is silvery-white or gray in color.
B. Iron has a boiling point of about 3,000°C.
C. Iron is a magnetic element.
D. Iron and sulfur react to form iron sulfide.
Answers: 2
Chemistry, 21.06.2019 20:20, mgavyn1052
Calculate the molarity of the solution. 6.02 x 1022 molecules of hci (molecular weight = 36.5 g/mole) in 2.0 liters of water m
Answers: 1
Chemistry, 22.06.2019 03:00, HHHHHHHHHMMMMMMMMM
About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question
Answers: 1
Chemistry, 22.06.2019 14:00, BrandyLeach01
How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?
Answers: 3
Chemistry, 22.06.2019 14:30, joejoefofana
Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀ pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4. 0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.
Answers: 3
1. A pure substance is a chemical substance that has the same composition throughout. There are two<...
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