0.25 mole of O2 will contain the same number of molecules as 0.25 mole of NH3.

true or false?

Where are metals, nonmetals and metalloids on the periodic table

What is the classification of a solution with a ph of 8.3?

A 6.55 g sample of aniline (c6h5nh2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 14.25 kj/°c. if the initial temperature was 32.

A baker touches a pie right after taking it out of the oven. Which statement best explains why the pie feels hot? A. Molecules in the skin move faster than molecules in the pie, so heat is transferred to the pie. B.

The AU is used to measure distances where?

What element is represented by the following electron configuration: 1s22s22p63s23p64s23d4 Question 2 options: Cr Ca Ge Ar

He substance, cocl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The weighted average atomic mass of an element depends upon the a. relative abundance of protons in the element b. mass and relative abundance of each isotope of that element c. mass and relative abundance of each neutron of that element d.

What part of an atom do we change for isotopes

The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/L. Water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/L.