What is an example of a physical change involving iron and a chemical change involving iron?

Calculate the mass of 2.25*10^22tungsten atoms.

What is the percent composition of carbon in glucose (C6H12O6) ? (The molar mass of C = 12.01, H = 1.0079 and O = 16.00.)

Waves carry energy without transporting

Which of these accurately describes a chemical reaction? A. Products and reactants combine to form new substances. B. Products combined to form reactants C. Reactants combine to form products D. Products and reactants combine to form new reactants.

A sample of a solid labeled as NaCl may be impure. a student analyzes the sample and determines that it contains 75 percent chlorine by mass. Pure NaCl contains 61 percent chlorine by mass.

Which of the following correctly identifies steps used in the fractional distillation of petroleum? The mixture is cooled, condenses, then heated and boils. The mixture is cooled, boils, then heated and condense.

What is the formula of the most stable oxide of francium?

You just calculated that the heat of fusion for chloromethane is 6400 J/mol. The heat of fusion for hydrogen is 120 J/mol. Which of the following account for this difference? a. Hydrogen has stronger intermolecular forces than chloromethane. b.

Magnesium burns with a very bright light. When the flame goes out, a White powder is left behind. what is the word equation for this reaction.

Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. Include the terms cohesive and adhesive forces properly in your explanations.