The correct answer is a descriptive investigation.
An investigation which does not involve hypotheses called descriptive investigation.
Hypotheses are termed as scientific hypotheses and require that one can test it. In hypothesis, previous observation can not satisfactorily be explained with an available scientific theory.
Working hypotheses are being proposed for further research.
Molality is a measure of concentration that relates the moles of solute to the kilograms of solvent, it is described by the following equation:
We are given the molality(2.50m) and kilograms of solvent(0.500kg), so we solve for moles of solute from the equation:
To make a 2.50molal NaOH solution would be needed 1.25moles of solute
Answer: 1.25 moles
Explanation:
oh shi sorry I wish I could help but I'm stupid
Answer:
The last one because the first one is the most conductive so if you reverse its least conductive
Explanation:
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Oxidation number of an atom is the charge that atom would have if the compound is composed of ions. In neutral substances that contains atoms of one element the oxidation number of an atom is zero. Thus atoms in O2, Ni2, and aluminium all have oxidation number of zero.
In this case, Ni2, the oxidation number of Ni atom is zero,
for NiO4-, assuming oxidation number of Ni is x
(x ×1) + (-2 × 4) = -1
x = + 7
Therefore, the oxidation number goes from 0 to +7
