Question

Describe the difference between a physical change and a chemical change.
2. Is boiling considered a physical change or a chemical change? Explain your answer.
3. Describe the types of reactions in the lab you completed in lesson 04.05. What reaction was the most interesting or surprising to you? You MUST include the chemical equation (balanced) as part of your answer.
4. Balance the following equation:
N2 + H2 --> NH3
5 What are some properties that all combustion reactions have in common give at least two properties
6 If a metal chlorate, like potassium chlorate KClO3

Answer 1

@pooja195

Answer 2

Is boiling considered a physical change or a chemical change? Yes or No?

Answer 3

Boiling water is a physical change. all changes of state are physical changes

Answer 4

What physical changes usually do is to retain identity for substance. Ex: Change of melting points is considered a physical change because there's a change in temperature (warm or cold) and change of state (boiling point changes ice to water)

Answer 5

Good job :)

Answer 6

That was for question 2. For one, you already know the physical change so you want to know how chemical changes occur. Chemical changes occurs when substances are converted into a new substance. Example, paper gets burn, before the combustion, it was a paper, afterwards it no longer becomes paper (ashes).

Answer 7

Question three, you do the lab

Answer 8

4. Balance the following equation: N2 + H2 --> NH3
Can you balance this, or at least show your attempt on this one? :)

Answer 9

I can walk you through it

Answer 10

N2 + 3H2 --> 2NH3

Answer 11

i think?

Answer 12

Correct

Answer 13

For question 5, what does it mean when there's a "combustion" reaction?

Answer 14

its like an explosion or it gives off light?

Answer 15

Combustion reaction is when substances get burned, mostly involving oxygen (O2) and releasing heat and giving off light in sense.

Answer 16

ok ok.....thats something else