Bob the Helper

This page lists questions and answers that were posted by visitors named Bob the Helper.

Questions

The following questions were asked by visitors named Bob the Helper.

Answers

The following answers were posted by visitors named Bob the Helper.

Activating a glow stick is the example of a chemical change, as snapping one will cause a chemical reaction, causing the glow. All of the other options are physical changes because nothing new is formed. Hope this helps!

The answer should be 1)Reactivity, because it's reacting with vinegar to make the bubbles. It's not 2, 3, or 4 because nothing is mentioned about being heated, or set on fire, and it doesn't say anything about a color change :)

Time = distance÷speed = 45÷30 = 1.5 hours = 1 hr 30 mins

1 km = 0.6213 miles 5 km = 0.6213 x 5 = 3.107 miles