Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
In given reaction:
Reactant A = 115 g
Reactant B = 84 g
Product AB = ?
A + B → AB
115 g + 84 g = 199 g
199 g = 199 g
Photosynthesis is when plants make food, sugar, by stored/absorbed energy from the sun.
So the change would be plants making their on food, or maybe using energy from the sun.
Limitations of litmus paper and phenolphthalein:
They do not give the numerical pH value.
Can differentiate only between a very strong acid and base.
The colour change can be for reasons other than acid- base reactions.
The litmus test is quick and simple, but it suffers from a few limitations. First, it's not an accurate indicator of pH; it does not yield a numerical pH value. Instead, it roughly indicates whether a sample is an acid or a base. Second, the paper can change colors for other reasons besides an acid-base reaction.
1) Answer is: <span>C) London dispersion.
</span>The London dispersion force is the weakest and temporary attractive intermolecular force. Atoms of one molecule induce temporary dipole at another molecule.
2) Answer is: <span>A) ionic bond.
</span>Ionic bond is formed<span> by the attraction of oppositely charged atoms (cations andanions).</span>