What two quantities must be known to calculate the density of a sample of matter?

a. mass and volume

b. length and mass

c. size and weight

d. weight and volume

What types of earthquake waves usually cause the most destruction? A. Stress waves B. Primary waves C. Secondary waves D. Surface waves

How many molecules are there in 30.0 g of methane gas (CH4) ? a. 1.00 mole of molecules b. 3.011 x 10^23 molecules c. 1.13 x 10^24 molecules d. 6.88 x 10^23 molecules e. 30 molecules

A 0.2000 g sample of a compound (vitamin C) composed of only C, H, and O is burned completely with excess O2. 0.2998 g of CO2 and 0.0819 g of H2O are produced. What is the empirical formula?

In order for the Colorado River to carve the deep Grand Canyon, what must happen first? A. Uplift of the Colorado Plateau B. Motion along the San Andreas fault C. Uplift of the Appalachian Mountains D. Rifting of supercontinent Rodinia

Which statement is true about sodium chloride (NaCl) ? It is a salt because it decreases the concentration of metallic ions. It is an acid because it is formed by the reaction of a salt and an acid.

Group two elements are a. Metals b. Nonmetals c. Transition metals

Which of the following atoms will not react with water? A. K B. Li C. Pb D. Na

Which of the following is not a component of plasma? A. Carbon monoxide B. Blood C. Water D. Oxygen

The atomic radius of an element _ when you move from the top to the bottom of a family. O decreases O increases

Lowest density of all elements