Lakes, rivers, and streams make up what percent of the fresh water on Earth?

1%

10%

20%

25%

Is the density of iron greater then the density of gold

Which substances are made up of polymers? DNA a glass bottle ice crystals the proteins in hair rubber car tires

What is occurred when energy is taken in or given off

Which compound plays an important role in leather processing and electroplating? nitric acid hydrochloric acid ammonia magnesium hydroxide

What property of carbon gives it the ability to form many different biological macromolecules, and why is this so important to life?

What is the molar mass of Al2 (SO4) 3?150.03 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol

1. Which of the following species determines the chemical properties of an atom? A. Electron B. Neutron C. Nucleus D. Proton 2. The following glasswares are used to measure the volume of liquids except A. graduated beaker B. pipette C. test tube D.

A sample of a certain material has a mass of 2.03 x 10-3 g. calculate the volume of the sample, given the density is 9.133 x 10-1 g/cm3.

What happens to a reactant molecules when forming product molecules

Which is the atomic number of an atom with six valence electrons