Answer:
A pure substance consists only of one element or one compound and a mixture consists of two or more different substances, not chemically joined together.
So, a mixture is like mixing - let's say - sugar and rice together (dry BTW), but you can clearly see both substance are not chemically mixed together, if that makes sense. Thus, you can easily separate them out.
Answer:
The statement 'If the reactions of A⟶D are rearranged, they become non spontaneous.' is false
Explanation:
Step 1: Data given
Reaction 1 (A⟶B) has a ΔG=+3 kJ/mol
Reaction 2 (B⟶C) has a ΔG=−6kJ/mol
Reaction 3 (C⟶D) has a ΔG=+1 kJ/ mol.
Step 2:
To be spontaneous ΔG should be negative (ΔG<0)
For reaction A⟶D; ΔG = 3kJ/mol -6kJ/mol + 1 kJ/mol = -2 kJ/mol
This means for the reaction A⟶D; the reaction is spontaneous
This means for the reaction D⟶A; ΔG = 2kJ/mol, so the reaction is non-spontaneous
For reaction 1 and 3 the reaction is ,non-spontaneous (but the reverse reaction is). Reaction 2 is driving reactions 1 and 3 forward. A⟶D is thermodynamically spontaneous.
The statement 'If the reactions of A⟶D are rearranged, they become non spontaneous.' is false
Answer:
Modern recorders are most commonly pitched at A=440 Hz, but among serious amateurs and professionals, other pitch standards are often found. For the performance of baroque music, A=415 Hz is the de facto standard, while pre-Baroque music is often performed at A=440 Hz or A=466 Hz.
Explanation:
Explanation:
Any orbital can hold a maximum of 2 electrons with opposite spin. The first shell has one 1s orbital and holds 2 electrons. The second shell holds 8 electrons; 2 in a 2s orbital and 6 in three 2p orbitals. The third shell holds 18 electrons; 2 in a 3s orbital; 6 in three 3p orbitals; and 10 in five 3d orbitals.
Cl, because a higher electronegativity indicates that the atom attracts more electrons.