How many protons and neutrons in the atom K-42

How much heat do you need to raise the temperature of 150 g of ice from - 30°C to - 15°c?

In a calorimeter, 35 g of ice melts with a heat of fusion of 334 J/g. How much heat is absorbed?

At STP, oxygen exists in two forms, O2 (g) and O3 (g). These two forms of oxygen have 1. different molecular structures and different properties 2. different molecular structures and the same properties 3.

If the volume of an object increases but the mass stays the same, which will happen to the density?

A solution is made by dissolving 85.0 mL of sodium fluoride to water until the final volume is 350.0 mL. Identify the solute in this solution. A. Sodium flouride B. Water C. Sodium fluoride and water D. Unable to determine

Disease causing bacteria need oxygen to survive. true or false

Tell what kind of electrical charge eltrons, protons, and neutrons have

Which of the following substances is an Arrhenius acid? BF3 HCN NH3 Mg (OH) 2

Which of the following redox reactions do you expect to occur spontaneously in the forward direction under standard conditions? a. Ni (s) + Zn2 + (aq) →Ni2 + (aq) + Zn (s) b. Pb (s) + Mn2 + (aq) →Pb2 + (aq) + Mn (s) c.

What are abiotic factors of the enviroment lynx