Cold packs contain chemical that react to absorb heat. Which substances is used in cold packs?

A. Calcium Chloride

B. Sodium Carbonate

C. Magnesium sulphate

D. Ammonium nitrate

Calculate molality, molarity and mole fraction of KI if the density of 20% (mass) aqueous KI is 1.202 g/mL

A. H + concentration lower than OH - concentration:

a student determines. 8.2 mg of oxygen is dissolved in a 1000 gram sample of water at 15° Celsius what type of solution is the sample

The alimentary canal consists of the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. a. True b. False

Explain the relationship between heat and thermal energy

In a solution such as salt water, the component that is dissolved is called the O solute O solvent O suspension O colloid

Which is the balanced chemical equation showing hydrogen peroxide (h2o2) decomposing into hydrogen (h2) and oxygen (o2) ? 1. h2 + o2 → h2o2 2. 2 h2o2 → 2 h2 + o2 3. h2o2 → h2 + o2 4. 2 h2 + o2 → 2 h2o2?

Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B.

Zircon is a mineral with the empirical formula ZrSiO4. If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10. g of zircon?

Which property below is not a general property of metals: A. Ductile C. Malleable B. Poor conductor of heat D. High luster