Explain why bridges have expansion joints in them?

Which group of elements is not usually reactive with any other elements? A. metals B. plastics C. metaloids D. noble gases

Mechanical energy is the sum of an object's potential energy and kinetic energy. Consider the positions of this swinging pocket watch. At which positions will the potential energy be the highest? Assume the pendulum can swing forever ignore friction.

What is the molar concentration of chloride ions in a solutionprepared by mixing 100mL of 2.0 M KCL with 50 L of a 1.5 MCaCl2 solution?

A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide? Superscript 53 subscript 78 upper I. Superscript 78 subscript 53 upper P t. Superscript 131 subscript 78 upper P t. Superscript 131 subscript 53 upper I.

Which substances are always produced in an acid-base neutralization reaction? check all that apply. check all that apply. a base a salt an acid water a gas?

Open-ended question: Differentiate between a solution and a two phase mixture. Brass is would be classified as which one of them? Which would you classify a salad as?

29.00gx11.000g equals to what? And then round to appropriate significant number.

Compounds keep the chemical properties of the elements they are made from.

Which of the following is the best name for a compound made from nitrogen and oxygen? (N2O3) nitrogen oxide nitrogen II oxide nitrogen trioxide dinitrogen trioxide

How much energy is required to heat 250 grams of water from 20.0°C to 80.0°C? The heat capacity of water is 4.186 J/g°C Q=mc∆T