Why is air considered as a pure substance only when it is in gaseous form?​

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.

Which is true about metals used for jewelry, such as platinum and gold? a. they have low flammability. b. they have low reactivity. c. they have high flammability. d. they have high reactivity.