A plastic cup is filled with 15.5 grams of water. The cup is sealed and placed in the freezer. The water freezes and turns to ice. The next day, the ice is taken out of the cup and massed. What is the mass of the ice?

What happens to the number in a measurement that is converted from kilometers to meters

What type of potential energy does a stretched rubber band have? -Mechanical Kinetic energy -Chemical Potential energy -Elastic Potential energy -Electromagnetic energy

The table below gives the numbers of protons, electrons, and neutrons in four atoms. Atom Number of protons Number of electrons Number of neutrons 52 (39 39 12 40 40 bo 40 140 Based on the information that is given, which atom in the table has the

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume? Use M subscript i V subscript i equals M subscript f V subscript f ...

If two atoms have the same number of bonds, why would a compound with a lone pair of electrons on the central atom have smaller bond angles than a compound without a lone pair?

How many liters of chlorine gas can be produced when 0.98 l of hcl react with excess o2 at stp? 4hcl (g) + o2 (g) - > 2cl2 (g) + 2h2o (g) ?

In the reaction of 1.15 g of salicylic acid, molar mass 138.12 g/mol, with 2.83 g of acetic anhydride, molar mass 102.10 g/mol, a student obtained 1.21 g of acetylsalicylic acid, molar mass 180.17 g/mol. What is the percent yield?

A sample of hydrated calcium sulfate has a mass of 20.88 g. After it is heated, it has a mass of 16.51 g. What is the percentage by mass of water in the hydrate

All organisms need energy from food in order to survive. Plants produce their own food through photosynthesis. Animals must find external sources for food. Which of the following is true? A. Plants are autotrophs, and animals are heterotrophs. B.

What is effective nuclear charge of S2 - and S? Does the Zeff differs from ions and atoms of the same element.