Which property of substance is not altered by a physical change?

Which type of gas is filled in lays pack and why?

A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 11.62 nm . What is the total width of a crystal in millimeters 105 molecules across? Write your answer as a decimal.

Do plants uptake phosphorus as P?

What is the electron configuration for a calcium atom? 1s2, 2s2, 2p6, 3s2, 3p6, 4s2 1s2, 2s2, 2p6, 3s2, 3p6, 4s1 2s2, 2s2, 2p6, 3s2, 3p6, 4s1 1s1, 2s2, 2p6, 3s2, 3p6, 4s1

Balance the following reaction: NaOH + HCl → NaCl + H2O Enter your answer in the space provided.

Is there a difference between the freezing temperature and the melting temperature? Explain your answer in terms of numerical values, physical change and energy changes

When an acid and a base react, a particular type of salt is formed. This is an example of what type of reaction? A. physical only B. chemical only C. physical and chemical

A chemist adds 0.55 L of a 4.69M silver nitrate (AgNO3) olution to a reaction flask. Calculate the mass in kilograms of silver nitrate the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

How many moles of s atoms are present in 76.1 g of cs2?

If the silver chloride is not dry when its mass is determined, will the calculated percent of silver in the alloy be too high or too low?