A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?

How can a permanent magnet be damaged? a. cut the magnet in half b. heat the magnet up c. strike the magnet with a heavy blow d. both the second and third choices above

Calculate the enthalpy change for the thermite reaction: 2al (s) + fe2o3 (s) →2fe (s) + al2o3 (s), δh∘rxn=-850 kj when 8.00 mol of al undergoes the reaction with a stoichiometrically equivalent amount of fe2o3.

High viscosity at higher temperatures unreactive with other substances liquid at high temperatures organic compound poor conductor of electricity Based on the provided chemical and physical properties of the unknown substance.

Rocks formed from particles deposited by wind and water

HBr + Mg (OH) 2 MgBr2 + H2O

Identify the element that chlorine forms a covalent bond with

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?