M.C.Q. 🧪: Choose the correct answer(s)
🇫🇷 French Version
1.
In a chemical equation, the arrow ➜:
indicates the direction of the chemical transformation
separates the reactants 🧪 from the products 🎯
is placed after the products
2.
“CH
4
+
2
O
2
→
2
H
2
O + CO
2
”
This chemical equation contains:
two reactants
two products
4 different molecules ⚛️
3.
“
2
C
4
H
10
+
13
O
2
→
8
CO
2
+
10
H
2
O”:
is a balanced chemical equation
contains 8 carbon atoms before and after the arrow
contains 16 oxygen atoms after the arrow
4.
“
2
C
4
H
10
+
13
O
2
→
8
CO
2
+
10
H
2
O”:
In this equation, the oxygen atom is present in:
only one product
two reactants
two products
only one reactant
5.
To balance an equation, you begin by balancing atoms present in:
only one reactant and two products
only one reactant and one product
two reactants or two products
6.
“CH
4
+
2
O
2
→
2
H
2
O + CO
2
”
This chemical equation means that one methane molecule:
reacts with one dioxygen molecule
reacts with two dioxygen molecules
reacts with three dioxygen molecules
📊 RESULT:
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