Calcium has three different isotopes. One has a mass of 35 amu; another has a mass of 41 amu; and another has a mass of 40 amu. Calculate the average atomic mass of calcium.

Why is the theoritical strngth of metals much higher than that observed experimentally

Suppose you put equal amounts of pure water and salt water into separate ice cube trays of the same size and shape. What would expect to happen when you put both trays in the freezer? Explain.

Which of the following describes a chemical reaction? A. Molecules mix without interacting. B. Atoms in substances react with each other. C. Substances change shape but not properties. D. Molecules interact without bonds breaking.

What is the formula formed by the mixture of AgnO3+Na2CO3

A 19.0g sample of brass, which has a specific heat capacity of 0.375·J·g-1°C-, is dropped into an insulated container containing 300.0g of water at 20.0°C and a constant pressure of 1atm. The initial temperature of the brass is 81.7°C.

What element is reduced in the following reaction? Pb + SO42 - + AuCl4 - yields PbSO4 + Au + Cl- A) Pb B) Au C) S D) O

Compare and contrast between nuclear fission and fusion

Water has unique properties which include its strength as a solvent; its three environmental stages of solid, liquid, and gas; and its temperature regulation. these properties are due to polar covalent bonds between oxygen and hydrogen.

What happens to the temperature of a substance while it is changing state? Explain

How do I solve for the density of a block of wood that has a mass of 120g and a volume of 200cm3?