A natural sample of neon has a relative atomic mass of 20.2.

What is the mass number of the most common type of atom in the sample of neon?

A cube of butter weighs. 254 pounds and has a volume of 129.4 milliliters what is the density

You and your lab partner are asked to determine the density of an aluminum bar. The mass is known accurately to 4 significant figures. You use a simple metric ruler to determine its size and calculate the results in column A.

A student prepares a solution by dissolving 1.000 mol of Na2SO4 in water. She accidentally leaves the container uncovered and comes back the next week to find only a white, solid residue. The mass of the residue is 322.2 g.

The oxide of element X is reduced by heating with carbon. Element X does not react with cold water, steam or dilute hydrochloric acid. What is X?

Describe the chemical reaction based on the chemical equation below. Also, explain whether the equation is balanced.

Write an equation for the reaction of hydrogen chloride and sodium sulfide to produce hydrogen sulfide with sodium chloride. 1. Show the formulas of the reactants 2. Show the formulas of the products. 3. Write the balanced equation for this reaction

Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of solution should she use?

A student makes observations when water is added to a blue solution of copper sulfate. The student makes only 1 observation: the solution changes to a lighter shade of blue. Is this an example of a chemical reaction? Explain your reasoning.

When dos the spring tide occur

As ice transforms into steam, Question options: new molecules are formed. the types of atoms are changed. energy is absorbed by the molecules. the mass of the molecules is increased.