An atom has three full orbitals in its second energy level. How many electrons are present in the second energy level of the atom?

Which activity involving a segment of DNA does not result in a mutation? Adenine is added to the sequence. Thymine and guanine are removed. mRNA pairs adenine with uracil instead of thymine. mRNA substitutes guanine for adenine in two locations.

Sugar is made up of clear, colorless crystals that dissolve easily in water, but the crystals and their solution do not conduct electricity. Which statement describes sugar?

Which statement accurately describes part of the dissolving process of a polar solute in water? Solute molecules repel water molecules. Water molecules surround solute molecules. Water molecules are strongly attracted to nonpolar substances.

Select the correct answer from each drop-down menu. Complete the statements about the nature of scientific knowledge. Among the different types of scientific knowledge, are likely to be modified or discarded most frequently.

According to the theory of island biogeography which of the following ecosystems is not an island ecosystem? a. cave b. salt marsh c. mountaintop d. desert oasis

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong

In which orbital does an electron in a bromine atom experience the smallest?

What characteristics of water allow it to have high surface tension?