Which of the following statements is true? choose one: a. bronze was used as early as 4000 b. c.e. to replace less-desirable iron tools. b. bronze is harder than copper, so it retains a cutting edge sharper than that of copper. c. bronze is an alloy of copper and chromium. d. copper is not easily smelted, because extremely high temperature is required.

B.Bronze is harder than copper, so it retains a cutting edge sharper than that of copper.

Explanation:

The importance of bronze in the history of the human kind can not be only measured in the durability but the help that it provided to our ancestors, the things they were allowed to do once they dicovered how to mold it, and the tools that they produced and made many every day tasks easier for them and the ability of bronze to mantain the cutting edge longer than copper was one of the main reasons why it took its places in the fabrication of many tools.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

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