Is butter melted in a pan a endothermic or exothermic change

Which metal exist in liquid state and can be cut with knife?

Tow formulas for compounds containing hydrogen and oxygen are H2O and H2O2. Do these formulas represent the same compounds? Explain

What are the processes water moves through, in order, as it moves from the surface of a lake to a cloud in the sky?

Which of the following is an example of a force? Question 8 options: a) push b) pull c) inertia d) both A and B e) all of the above

Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper. What is the mass of 2.20 * 1022 molecules of NaOH (Molar mass = 40.0 g/mol) ? Express the mass in grams to three significant figures.

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration