An atom has 18 protons and 8 valence electrons which statement would best identify this element

Adding iron filings to sand

Write a brief explanation about why a plant extract is a mixture

Can water vapor be treated as an ideal gas? discussbriefly.[5]

These are the reactants in the chemical equation 2 H2 + 02 - -> 2 H20 A. 2H2 + O2 B. 2 H2O

Which of the following has the smallest bond dipole? a. C-H b. C-F c. C-Si d. C-C

Which describes the volume of 1 mol of gas at standard temperature and pressure? ER The volume is greater for a larger mass of gas. The volume is the same for any gas. The volume depends on the size of the container.

When studying historical geology, which type of rock provides the most useful evidence for uncovering what occurred? metamorphic igneous basalt igneous granite sedimentary

Calculate the molar solubility of ca (io3) 2 in each solution below. the ksp of calcium iodate is7.1 * 10-7.

At normal temperature and pressure, air has a density of 0.001184 g/mL. What is the mass of air in a room that is 3.07 m by 3.00 m by 3.77 m? Answer in units of kg.

A gas made up of atoms escapes through a pinhole 0.155 times as fast as h2 gas. write the chemical formula of the gas.