Question

1. the table shows the melting points to the nearest degree celsius for six substances. chlorine fluoride melts at $-154^circ$c. between which two substances is the melting point of chlorine fluoride?

substance	melting point ($^circ$c)
acetic acid	$17$
ammonia	$-78$
nitrogen	$-210$
octane	$-57$
water	$0$

Explanation:

Step1: List all melting points

We have the melting points: Hydrogen (-259°C), Nitrogen (-210°C), Chlorine fluoride (-154°C), Ammonia (-78°C), Octane (-57°C), Water (0°C), Acetic Acid (17°C).

Step2: Order the melting points

Ordering the temperatures from lowest to highest: -259 (Hydrogen) < -210 (Nitrogen) < -154 (Chlorine fluoride) < -78 (Ammonia) < -57 (Octane) < 0 (Water) < 17 (Acetic Acid).

Step3: Identify the two substances

From the ordered list, -154 (Chlorine fluoride) is between -210 (Nitrogen) and -78 (Ammonia).

Answer:

Nitrogen and Ammonia