Explain why energy has to be supplied to turn a liquid into a gas

In a calorimetry experiment, it was determined that a 92.0 gram piece of copper metal released 1860 J of heat to the surrounding water in the calorimeter (qcopper = - 1860 J). If the final temperature of the copper metal-water mixture was 25.

In the science lab, Anu determines that a substance is acidic. What evidence might she have based this on?

Sodium hydroxide, NaOH is a strong base that is used in industrial synthesis and process such as making paper. What is the mass 2.60x10^22 molecules of NaOH (molar mass=40.0g/mol) ? Express the mass in grans to three significant figures

Laura wonders why an object can ever accelerate if every force it exerts causes a reaction force. Which explanation best answers her question?

An electrically neutral atom of beryllium has four protons. Which Statement is true? -There are four neutrons in the nucleus. - There is a charge of + 4 on an atom of beryllium. - There is a charge of - 4 on an atom of beryllium.

Mildew is a fungus that grows in wet areas and can slowly grow from

The salts in the sea come from A) weathering and erosion of rocks. B) acid rain. C) particles falling from space. D) organisms that live in the sea.

Convert 2.50 x 10^5 seconds into years

How is the law of multiple proportions related to molecular formula and their mass ratios?

What are the products in a sodium and water reaction?