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

Substance tha have excess hydroxide ions (OH-) are

A 7.0-liter sample of N2 (g) at 3.50 atm, a 2.5-liter sample of Ne (g) at 1.00 atm, and a 5.0-liter sample of H2 (g) at 2.45 atm are transferred to a container. The temperature remains constant throughout at 25 °C.

Aerosol cans use compressed gases to propel the contents out of the can which of the following is the best explanation for why aerosol cans should not be overheated

The empirical formula of a compound of iron (Mg) and sulfur (S) was determined using the following data. A sample of Mg was weighed into a crucible and covered with finely powdered S.

A Surface wave is a combination of what two waves? A. Two longitudinal B. A transverse and longitudinal C. Two transverse D. A transverse and a light

Low density: low pressure: high density Is which. evaporation? water vapor? condensation / liquid water

Which structures are found on sponges? pores medusae polyps stinging cells

Coefficients in a chemical equation are used to: balance the number of atoms on both sides of the equation ensure that all subscripts on both sides of the equation are the same indicate energy changes that occur during the reaction indicate the type

What determines your blood cholesterol level?

Describe two ways that water moves through earthy atmosphere in the water cycle.