The nucleus is:

a. the center of an atom

c. specified by mass number

b. specified by atomic number

d. all of the above

Without what do carbohydrates fats and proteins can not be changed into energy

Is water polar or dipolar?

A certain rock has a mass of 125 g. The rock is gently lowered into a graduated cylinder whose water level is 250 mL. When the rock is completely submerged, the water level rises to 300 mL What is the volume of the rock?

Water has a high specific heat because: Select one: a. it is a poor insulator b. hydrogen bonds must be broken to raise its temperature c. it has low density considering the size of the molecule d.

Verna studies a rose in science class. She takes it apart and compares its different pieces. Verna decides that the smallest thing that makes up a rose is a petal. If she used a microscope to look at the rose, would she change her mind? A.

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?

Oceans make the temperaturs of nearby land more extreme ... True or false

The Greek letter D stands for A. Mass of B. Rate of C. Change in D. Heat stored in

14. Two or more substances that are together but do not combine to form a new, pure substance.

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution