Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds 1. are hard 2. can dissolve 3. are clear 4. can melt

Which atom absorbs more energy, one in which an electron moves from the second shell to the third shell or an otherwise identical atom in which an electron moves from the first to the third shell?

How do knowing the half-life of carbon 14 can tell scientists the absolute age of a rock sample

Positrons are spontaneously emitted from the nuclei of (1) potassium-37 (3) nitrogen-16 (2) radium-226 (4) thorium-232

4. a) The enthalpy change of combustion of hexane was measured using a calorimeter containing 200 cm3 of water; 0.5g of hexane (C6H14) was burnt. The temperature of the water increased by 30 K. Calculate the enthalpy change of combustion of hexane.

Which of these elements has atoms that would have the most difficulty forming a covalent bond with oxygen (O) ? A. O B. S C. N D. Ne

How far is the Earth for the moon?

It is thought that organelles of eukaryotic organisms, such as mitochondria and chloroplasts (in plant cells) came from

How does temperature affect molecules

The color of Benedictâs solution is blue. What color does it change to in high sugar concentration?

What functional groups of the emulsifying agent provide the hydrophilic character? Do these groups affect the pH?