Ionic bonds form between.

metals and nonmetals

metals and metals

nonmetals and nonmetals

metals and noble gases

The heat of fusion of a substance is the energy measured during a 1. phase change 2. temperature change 3. chemical change 4. pressure change

Instrumental methods need only a microscopic sample to return an accurate result. Why is this so?

Instructions: Select the correct answer. An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What's one advantage of using electromagnets in devices? A.

What tye of molecule is this C5H24O12

Which phrase describes the composition of the most abundant mineral compounds on Earth? carbonates, oxygen, and one or more organic compounds oxygen, sulfates, and one or more nonmetals oxalates, oxygen, and one or more organic compounds Silicon,

A system consists of two components, each of which must activate if the system is to activate. One component has a reliability of. 99. The other has a reliability of. 95. The components are independent of one another with respect to reliability.

Which of the following energy level changes for an electron is most energetic? 3 → 2 5 → 2 4 → 2

Is baking soda a element compound homogeneous mixture or heterogeneous mixture?

For the reaction: C (CH3) 3I + Cl - → C (CH3) 3Cl + I- What is the activation barrier for the SN2 reaction mechanism, in units of kcal/mol? Provide your answer to the nearest 0.1 kcal/mol.

Which of the following utilizes the measurement of a short - or long-lived radioactive element, with its decay product, to determine the absolute age of an object? A. varves B. radiometric dating C. dendrochronology