Question

1. all the following are conductors except

(a) copper
(b) silver
(c) aluminum
(d) steel
(e) vacuum
(f) none of the above

1. which of the following is not a phase of matter?

(a) solid
(b) vacuum
(c) liquid
(d) gas
(e) none of the above

1. a science article refers to a temperature of 400 k. what is equivalent celsius temperature?

(a) 127°c
(b) 300°c
(c) 45.7°c
(d) 100°c

Explanation:

Question 13

Copper, silver, aluminum, and steel are all metals. Metals have free electrons that can move easily, making them good conductors of electricity and heat. Vacuum, on the other hand, is an empty space with no matter (or very few particles). Since there are no particles (like electrons in metals) to carry electric charge or heat, vacuum is not a conductor.

The three common phases of matter are solid (has a definite shape and volume), liquid (has a definite volume but takes the shape of its container), and gas (has no definite shape or volume). Vacuum is an empty space with no matter, so it is not a phase of matter.

Step1: Recall the conversion formula

The formula to convert Kelvin ($K$) to Celsius ($^{\circ}C$) is $T_{C}=T_{K}- 273.15$.

Step2: Substitute the given value

Given $T_{K} = 400\ K$. Substitute into the formula: $T_{C}=400 - 273.15$.

Step3: Calculate the result

$T_{C}=126.85\approx127^{\circ}C$ (rounded to the nearest whole number)

Answer:

(e) vacuum

Question 14