Which of the following is a change in which a new substance is formed? A) cutting a slice of cheese into two pieces B) burning wood in a campfire C) an ice cube melting D) sanding wood into a pile of saw dust

In the reaction HCl + NaOH → NaCl (aq) + H2O, if 45.0 milliliters of a 2.0 M HCl react in an excess of NaOH, how many grams of H2O will be produced?

The solute dissociates slightly in the solvent. how will the slight dissociation affect the reported

Which of the following best describes a solid? a. cannot change its shape to fit its container b. fills all the space in its container c. has atoms loosely attracted to each other

What is the basic unit of energy? O A. The kilogram O B. The what O C. The joule O D. The amp

How many formula units make up 11.2 g of magnesium chloride (MgCl2) ?

Which of the following does NOT occur at a subduction zone? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One oceanic plate moves into another oceanic plate. D.

4. What structural characteristics do all hydrogen atoms have in common?

Which of the following would be a result of increased solar activity? A. Longer winters B. Warmer-than-normal sea surface temperatures C. Colder-than-normal sea surface temperatures D. Shorter summers

The electron configuration of an element is 1s22s22p63s23p64s1. why is this a representative element?

Why is scientific notation important in chemistry?