The use of more advanced tools made of stone, wood, and bone, such as the ones illustrated below, was typical of which period of human history?

a. Paleolithic era

b. Neolithic era

c. Bronze Age

d. Iron Age

The atomic number of carbon is six, which means that a carbon atom has six protons. Carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. What is true about carbon and its isotopes?

What are metals and glass both conductors of?

Given the balanced equation, calculate the mass of product that can be prepared from 2.70 g of zinc metal. 2Zn (s) + O2 (g) →2ZnO (s)

Scientists often deal with numbers that are either very large or very small. For example, the radius of the Sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 * 10-4 millimeters.

Oxygen atom gains two electrons to become an oxygen ion. What is its electric charge?

Restate Newtons first law in terms of acceleration

Why is burning is not a recommended method of disposing plastics

Why do cells have a plasma membrane? A. to separate protein from the nucleus B. to distinguish plants from animals C. to define the size of the cell D. to separate the inside of the cell from its enviroment

Base on its molecular mass, what is the molar mass of iron

For the following reaction in aqueous solution, identify all those species that will be spectator ions. Select all that apply. Na, SO4+Hg (NO3) 2HSO4+2NaNO3 Choose one or more: A. Hg2S04 B. Na2S04 C. Nat D. NO3 E. SO42- F. Hg2 (NO3) 2 G. NaNO3 H.