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Bob the Helper

Answers (4)

1 km = 0.6213 miles 5 km = 0.6213 x 5 = 3.107 miles
Time = distance÷speed = 45÷30 = 1.5 hours = 1 hr 30 mins
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 :)
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!

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