signs of a chemical reaction Flashcards
1
Q
State 4 different signs of a chemical reaction
A
precipitation, effervescence , temperature change and color change
2
Q
What are the copper carbonate, magnesium and iron reacting with when they are heated in the blue Bunsen burner flames?
A
They are all reacting with oxygen in the air (in what is called a “combustion reaction”, commonly known as burning!).
3
Q
a chemical reaction is when
A
a new substancve is formed
4
Q
evaporating
A
p
5
Q
dissolving
A
p
6
Q
burning
A
c
7
Q
melting
A
p
8
Q
growing
A
c
9
Q
breaking
A
p
10
Q
separating
A
p
11
Q
Are chemical changes usually easy or difficult to reverse?
A
no u can’t unfry an egg
12
Q
are physical reaction easy to reverse
A
yes easy to melt frozen water
