Question

Which of the following is NOT an example of a pure substance?
A) Sodium Chloride
B) Silver
C) Orange Juice
D) Gold

Answer 1

Answer:

gold

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Answer 2

Answer:

D) Gold

Explanation:

Ca+2H2O→Ca(OH)2+H2↑

What volume of H2

at STP would be liberated when 8 g

of calcium completely reacts with water?

A.0.2 cm3

B.0.4 cm3

C.224 cm3

D.4480 cm3