On the scale of the cosmic calendar, in which the history of the universe is compressed into 1 year, how long is the average human life span?

A) 0.2 millisecond
B) 0.2 second
C) 2 seconds
D) 2 minutes
E) 2 hours


B) 0.2 second

Physics & Space Science

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In a polyethylene long-chain molecule, the carbon-carbon and hydrogen-carbon bonds are all ______________bonds.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

When solutions of AgNO3 and CaCl2 are mixed, which type of reaction is likely?

a. Combination b. Double-replacement c. Decomposition d. Single-replacement

Physics & Space Science

The crust on the near side of the Moon is on average thinner than the crust on the far side, due to our tidal pull on the Moon

Indicate whether the statement is true or false

Physics & Space Science

The electron spin quantum number can take on what values?

What will be an ideal response?

Physics & Space Science