Telescopes are examples of concave mirrors. true or false?

Estimate ΔG°rxn for the following reaction at 449.0 K. CH2O (g) + 2 H2 (g) → CH4 (g) + H2O (g) ΔH° = - 94.9 kJ; ΔS° = - 224.2 J/K

Define atomic number and atomic mass number under what conditions are two atoms different isotopes of the same element?

A sample of liquid heptane (C7H16) weighing 11.50g is reacted with 1.300 moles of oxygen gas. The heptane is burned completely. After the reaction is complete, the amount of gas present is 1.050 moles. a. How many moles of CO are produced? b.

Which two forms of life existed together on the Earth during the same time period

The unheated gas in the above system has a volume of 20.0 L at a temperature of 25.0 °C and a pressure of 1.00 atm. The gas is heated to a temperature of 100.0 °C while the volume remains constant. What is the pressure of the heated gas?

Are all metals acidic in nature and all non-metals basic? and what is the nature of their oxides?

How many atoms of Hydrogen in the products of the following equation? 3NO2 + H2O - -> NO + 2HNO3 1 3 4 2

What reactants form a combustion reaction? O A. A hydrocarbon and oxygen O B. Hydrogen and water vapor O C. A hydrocarbon and water O D. Water vapor and oxygen

Is the Sun bigger and brighter than Betelgeuse?

What is the si unit for the quantity of particles in a sample?