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in Chemistry
Answer: NaOH has an ionic bond between Na+ and OH-, and covalent bonds between O and H.
Answer: One mole of O2 contains 2 moles of oxygen atoms, which is 2 x 6.022 x 10^23 atoms.
Answer: H2 donates electrons and reduces other substances while itself getting oxidized.
Answer: Molar mass of water is 18 g/mol, so 36 g divided by 18 g/mol equals 2 moles.
Answer: In NaCl, each Na+ ion is surrounded by 6 Cl- ions and vice versa, giving coordination number 6.
Answer: Ethylene glycol lowers the freezing point of water and is commonly used as an antifreeze.
Answer: NH3 has a lone pair of electrons on nitrogen that it can donate, making it a Lewis base.
Answer: Ethanol reacts with ethanoic acid in esterification to form ethyl ethanoate and water.
Answer: Ethanol has a two-carbon chain with a hydroxyl group, giving it the IUPAC name ethanol.
Answer: The hydroxyl group is on carbon 2 of a three-carbon chain, giving propan-2-ol.
Answer: Chlorine has a high positive electron affinity, meaning it releases energy when gaining an electron.
Answer: C4H10 has two chain isomers: n-butane (straight chain) and isobutane (branched chain).
Answer: In Fe2O3, two iron atoms balance three oxygen atoms (each -2), so iron is +3.
Answer: Increasing reactant concentration raises the frequency of effective collisions, increasing rate.
Answer: NaOH completely dissociates in water to produce OH- ions, making it a strong base.
Answer: BF3 has three bond pairs and no lone pairs on boron, giving a trigonal planar geometry.
Answer: The azimuthal quantum number l determines the shape of an electron orbital (s, p, d, f).
Answer: Ethene undergoes hydration in acidic medium to form ethanol via electrophilic addition.
Answer: Water has 2 hydrogen atoms (2 g/mol) and 1 oxygen atom (16 g/mol) totaling 18 g/mol.
Answer: In Al2O3, two aluminium atoms balance three oxygen atoms (each -2), so aluminium is +3.