30) Which of these statements are true? 1 chromosome is made of DNA
2 chromosomes are found in the cell membrane
3 chromosomes are always formed from a single gene
4 genes are short sections of DNA

A) 1, 2, 3 and 4
B) 2, 3 and 4
C) 2 and 3
D) 1 and 4

The table lists the lattice energies of some compounds. compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf. the lattice energy increases as the cations get larger, as shown by lif and licl. the lattice energy decreases as cations get smaller, as shown by nacl and naf. the lattice energy decreases as the cations get smaller, as shown by naf and kf.

Which of the following is a chemical property of water at 4 c

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products