A firecracker exploding would be an example of a (n) ___? A. Physical change B. Exothermic reaction C. Formation of a precipitate D. Endothermic reaction

Calculate the number of moles in 369 grams of CaoCl2? a) 1 b) 2 c) 3 d) 4

The first letter of a chemical symbol is capitalized. true or false

Bronze is an alloy made of mostly copper (Cu) and tin (Sn). What type of bond forms bronze? A. Metallic bond B. Ionic bond C. Covalent bond D. Paired bond

Which phrase describes the mass of an ice cube?

Which situation is an indication that a chemical change has occurred?

The density of an aqueous solution of nitric acid is 1.36 g/ml and the concentration is 2.48 m. what is the concentration of this solution in percent by mass?

In a crystal lattice of an ionic compound, A. Kind of a given charge are clustered together B. Ions are surrounded by ions of the opposite charge C. A sea of electrons surrounds the ions D. Neutral molecules are present

Discuss why two objects of made of the same type of matter at the same starting temperature with different masses increase in temperature at different rates when the same amount of thermal energy is transferred to each object.

An isotope contains 56 protons, 54 electrons, and 74 neutrons. What is the identity of the isotope?

How many ozone particles are needed to form 24 particles of oxygen gas?