What happens during a chemical change?

Physics

1 answer:

Katyanochek1 [597]4 years ago

6 0

Answer:

composition changes

Explanation:

The main difference between physical and chemical changes is the following:

- in a physical change, no new substances are formed, while the atoms/molecules of the original substances can be re-arranged. Examples of physical changes are the change of state (for instance, from solid to liquid): no new substance are formed, but the bonds between molecules are broken and the molecules change position/arrangement.

- in a chemical change, new substances are formed: an example of this change are chemical reaction, such as the burning of a substance, in which new substances are formed. For this reason, the composition changes during a chemical change.

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Please help!! I will give brainliest!

grandymaker [24]

Answer:

Depends.

Explanation:

Whether the object is going left or right, the speed will stay the same until friction eventually stops it. However, if, for example, we're talking about an object going straight before veering right, then yes, speed does matter. An object will normally have to speed up or slow down momentarily when changing direction to keep itself sustained on the ground.

So, honestly? It really depends on what we're talking about!

Hope this helped!

Source(s) used: None.

7 0

3 years ago

1-A train travels 100 km to reach town A in one hour and 15 min. The train stops at station A for 45 minutes. Then it travels 15

kirill [66]

Answer 1) : 62.5 km/hour is the average velocity of the train.

2) The final velocity of the car at the end of 75 m is 14.69 m/s

Explanation:

1) Displacement of the train = 100 km + 150 km = 250 km

Total time train took =1 hour 15 min+ 45 min + 2 hours = 240 min = 4 hours