*Question*
Q: The presence of what makes soil hold together more tightly and enables it to hold more water? Read this paragraph and choose the correct option from the provided answers: Soils with lots of very small spaces are water-holding soils. When clay is present in a soil, the soil holds together more tightly. Clay-rich soil can hold more water. Choices: - sand - salt - glass - clay A:
**Answer**
clay

*Question*
Q: What type of electrons are electrons that are not confined to the bond between two atoms? Read this paragraph and choose the correct option from the provided answers: In benzene, the true bonding between carbon atoms is neither a single nor a double bond. Rather, all of the bonds are a hybrid of a single and double bond. In benzene, the pi bonding electrons are free to move completely around the ring. Delocalized electrons are electrons that are not confined to the bond between two atoms, but are instead allowed to move between three or more. The delocalization of the electrons in benzene can best be shown by showing benzene with a ring inside the hexagon, with the hydrogen atoms understood. Choices: - virtualized - detached - internalized - delocalized A:
**Answer**
delocalized

*Question*
Q: What are solutions that maintain a relatively constant ph when an acid or a base is added? Read this paragraph and choose the correct option from the provided answers: Buffers are solutions that maintain a relatively constant pH when an acid or a base is added. They therefore protect, or "buffer," other molecules in solution from the effects of the added acid or base. Buffers contain either a weak acid (HA) and its conjugate base (A) or a weak base (B) and its conjugate acid (BH+), and they are critically important for the proper functioning of biological systems. In fact, every biological fluid is buffered to maintain its physiological pH. Choices: - gases - water - liquids - buffer A:
**Answer**
buffer

*Question*
Q: Melting ice cubes and freezing water are examples of change of what? Read this paragraph and choose the correct option from the provided answers: A: The paper is being cut into smaller pieces, which is changing its size and shape. The ice cubes are turning into a puddle of liquid water because they are melting. This is a change of state. The tablet is disappearing in the glass of water because it is dissolving into particles that are too small to see. The lighthouse is becoming coated with ice as ocean spray freezes on its surface. This is another change of state. Choices: - volume - role - role - state A:
**Answer**
state