Indicate whether each of the following statements is true or false: Increasing t
ID: 1069888 • Letter: I
Question
Indicate whether each of the following statements is true or false: Increasing the temperature always increases the activation energy of a reaction. In any spontaneous process, the free energy of the system decreases. In a reversible process, the entropy of the universe increases. A catalyst is consumed in a reaction to increase the rate. All carbohydrates have the formula C_mH_2nO_n, where m and n are integers. Lipids are the primary components of cell membranes. The solubility of silver chloride is lower in pure water than it is in a 1.0 M solution of NaCl. Ligands are joined to metal ions by coordinate bonds. A ferromagnetic material contains at least one unfilled electronic orbital. The mass of a helium-4 nucleus is less than the sum of the masses of 2 free protons and 2 free neutrons. A cyanide ion can be a Lewis base. Polyethylene, DNA and starch are all polymers. Consider the set of known, stable isotopes of the elements. The ratio p/n, where p is the number of protons and n is the number of neutrons, increases as the atomic number increases. Alpha particles contain 2 protons and 2 neutrons, and can be emitted in radioactive decay. In nuclear fusion, energy is released when heavy elements are split to form lighter elements.Explanation / Answer
A. False (The activation energy does not change with temperature.)
B. True (A spontaneous process is the time-evolution of a system in which it releases free energy and moves to a more thermodynamically stable energy state.)
C. False (The entropy is unchanged during a reversible process. By definition a reversible process in an isolated system cannot increase entropy. If entropy is increased during a process in an isolated system then the process is irreversible)
D. False (Catalyst is the substance that increases the rate of a reaction but is not consumed in the reaction. It does so by lowering the activation energy.)
E. True (A carbohydrate is a biological molecule consisting of carbon , hydrogen and oxygen atoms, usually with a hydrogen–oxygen atom ratio of 2:1. in other words, with the empirical formula CmH2 nOn
F. True (The fundamental building blocks of all cell membranes are phospholipids. The formation of biological membranes is based on the properties of lipids, and all cell membranes share a common structural organization: bilayers of phospholipids with associated proteins.)
G. True (In solution chemistry there is a rule “like dissolves like”, which simply means that a polar compound NaCl is soluble in a polar solvent water and a non- polar compound AgCl is less soluble in water)
H. True (The molecules or ions surrounding the central metal ion are called ligands. They attached to the central ion by co-ordinate bonds