Describes how substances react or changes to form new substances

Use the following equation for the combustion of methane to answer the following questions: CH4 + 2O2 - > CO2 + 2 H2O ΔH = - 900 kJ a. Is the reaction exothermic or endothermic? b. If you burn 2 moles of methane, how much energy is released? c.

What is the mass of 2.3 moles of MgCl2?

When will the net enthalpy of formation of a solution (δhsolution) be endothermic?

A 200 mL K2SO4 solution with a concentration of 0.40 M is mixed with 400 mL of a K2SO4 solution containing 7% K2SO4 (m/v). The molar mass of K2SO4 is 174.3 g/mol. What is the final concentration of K2SO4 in the solution in molarity

Describe the components of an air solution using the terms "solute" and "solvent."

After Pangaea broke up, North America became part of what?

What the different betwen observe and reference

How many moles are in 12.5 g of H2O

How do the atomic number and the number of protons relate to one another? The atomic number tells us the number of protons The atomic number is protons + neutrons They do not Electron Cloud

Check my work? 150 g of an unknown liquid is heated with 24,975 kJ of heat to form 0°C to 75°C. Identify the unknown liquid. Substance C (J/g-°C) Water (ice) 2.05 Ammonia (liquid) 4.70 Ethanol 2.44 Gasoline 2.22 Water (liquid) 4.18 Water (vapour) 2.