The SI unit for distance is metres - m.
The SI unit for speed or velocity is metres per second - m/s.
The SI unit for acceleration is metres per second squared. - m/s^2.
The indivisibility of the atom ( postulate B ) is proved wrong. An atom can be subdivided into electrons, protons and neutrons.
Atoms of the same element can vary in their masses and densities ( in postulate D ). The atoms of the same element with different masses are called isotopes.
Answer:
Postulates that still hold true today are: A ) Atoms of different elements can combine physically and chemically. and C ) Chemical reactions occur when atoms are joined or separated.
the molarity of KCl solution prepared by dissolving 0.898 mole of KCl in 250 ml water is calculated using the below formula
molarity= moles/volume in liters
moles= 0.898 moles
volume in liters= 250/1000 =0.25 liters
molarity is therefore= 0.898/0.25= 3.592 M
Answer:
2 C(s) + O₂(g) + Fe₂O₃(s) + CO(g) → 2 Fe(s) + 3 CO₂(g)
Explanation:
This reaction has 2 steps:
Step 1: 2 C(s) + O₂(g) → 2 CO(g)
Step 2: Fe₂O₃(s) + 3 CO(g) → 2 Fe(s) + 3 CO₂(g)
To get the net chemical equation we need to add both steps, side to side.
2 C(s) + O₂(g) + Fe₂O₃(s) + 3 CO(g) → 2 CO(g) + 2 Fe(s) + 3 CO₂(g)
Then, we have to take out those substances that are repeated on both sides. In this case, we take out 2 moles of CO(g) on each side.
2 C(s) + O₂(g) + Fe₂O₃(s) + CO(g) → 2 Fe(s) + 3 CO₂(g)
This is the net chemical equation and it is <em>balanced</em>.
