Which of the following are mixtures? Air, salt, water, salt water

How much heat energy, in kilojoules, is required to convert 63.0 g of ice at - 18.0 ∘c to water at 25.0 ∘c?

Which statement best describes the collision of gas particles according to kinetic molecular theory

How many atoms are there in one molecule of hexane? (a) six (b) ten (c) twelve (d) twenty

What is a group of elements that form salts called

Which way will the equilibrium shift if you ... cool it to a low temperature?

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?