17O-2 What does the - 2 represent?

Which energy change occurs during boiling? A. Some heat energy of the substance is lost. B. Heat energy of the substance remains the same. C. Most heat energy of the substance is lost. D. Heat energy is absorbed by the substance.

How are nutrients returned to soil?

A scientist finds an unusual object and decides to study it. Which observation indicates that the object is a living thing? A.) It has an uneven shape. B.) It is made of cells. C.) It has a hard outer shell. D.) It is found in water.

How does the modern periodic table arrange elements? A. by atomic mass B. by atomic number C. by number of isotopes D. by electron mass

How many molecules (not moles) of nh3 are produced from 6.96*10-4 g of h2? express your answer numerically as the number of molecules?

If 31.6 g of KMnO4 is dissolved in enough water to give 160 mL of solution, what is the molarity? AND what mass of oxalic acid, H2C204, is required to make 300 mL of a. 74 M solution?

From where do the kinetic tiles collect energy?

For the reaction 2Fe + 3Cl2 → 2FeCl3 which of the following options gives the correct reactant:reactant ratio? Fe:Cl2 = 1:1 Fe:Cl2 = 2:3 Fe:Cl2 = 3:2 Fe:FeCl3 = 1:1

A 2.575 g piece of gold (specific heat = 0.129 J/g°C) at a temperature of 75°C is placed into cold water at 10°C. If the gold loses 10.0 J of energy, what is its final temperature in the water? Enter your answer to the nearest whole number of °C.

The complete combustion of gaseous sucrose at a constant pressure absorbs 544 kj of heapt per mole of surcrose. write the balance thermochemical equation for the reaction