During the course of the experiment, which of the following happens to the NO3- ions? answer choices They are oxidized by Cl- ions They are reduced by NO2 - ions They are decomposed by reacting with M+ ions They remain dissolved in the filtrate solution Question 10 300 seconds Q. Which of the diagrams best represents AgNO 3 solution in water?
12 Lack of nitrate ions (NO 3 –) in flowering plants causes yellowing of leaves and poor growth whereas lack of magnesium ions (Mg2+) causes yellowing between veins of leaves. What explains these differences? Mg2+ NO 3 – involved in chlorophyll synthesis involved in protein synthesis involved in chlorophyll synthesis involved in protein synthesis
Which of the following best helps to explain why the value of ΔH° for the dissolving of CaF2 in water is positive? Ca2+ ions have very strong ion-ion interactions with F- ions in the crystal lattice. In the spring, blossoms on cherry trees can be damaged when temperatures fall below −2°C−2°C.
Which of the following best describes the change that takes place immediately after the CH3OH is introduced into the previously evacuated vessel? A physical change takes place because intermolecular attractions are overcome.
Which statement best helps to explain the observation that NH3(l) boils at −28°C , whereas PH3(l)boils at −126°C ? NH3 has hydrogen bonding that is stronger than the dipole-dipole forces in PH3.
Which of the following best helps explain why the electronegativity of Cl is less than that of F? The mass of the Cl atom is greater than the mass of the F atom.
Which of the following best describes the change that takes place immediately after the CH3OH (l) is introduced into the previously evacuated vessel? The temperature of the CH3OH (l) is increased from 300K to 400K to vaporize all the liquid, which increases the pressure in the vessel to 0.30atm.
Which of the following best describes the change that takes place immediately after the CH3OH(l) is introduced into the previously evacuated vessel? A physical change takes place because intermolecular attractions are overcome.
This form of boron nitride is one of the hardest substances known. Which of the following best helps explain why boron nitride is so hard? Boron ions and nitrogen ions are held together by ionic bonds. Boron nitride is a network solid of atoms connected by covalent bonds with fixed bond angles.
Which of the following could be the identity of a white crystalline solid that exhibits the following properties? NaOH. You just studied 22 terms!
The boiling points of the noble gases increase as their atomic masses increase. The boiling points of the noble gases are very low compared to those of other substances with similar masses. This indicates that only weak London dispersion forces are present.May 29, 2015
The photoelectron spectrum indicates that the element has one valence electron, which means that element tends to form ions with a +1 charge. Which of the following best helps to explain why the electron affinity of Br has a greater magnitude than that of I? The ionization energy of BrBr is higher than that of II.
Which of the following best helps to explain why the atomic radius of K is greater than that of Br? The effective nuclear charge experienced by valence electrons is smaller for KK than for Br.
The extra repulsion involved leads to the electron affinity being lower for P than for Si despite the higher nuclear charge.Nov 3, 2014