1.which of the following correctly describes carbon, represented by c? it is an element because it is made of atoms that are all the same type it is a compound because it is made of different types of atoms that are chemically joined together. it is a mixture because it is made of different type of atoms that are not chemically joined together. 2. which of the following correctly describe carbon dioxide represented by co2 it is an element because it is made of atoms that are all of the same types it is a compound because it is made of different types of atoms that are chemically joined together. it is a mixture because it is made of different types of atoms that are not chemically joined together.

Describe the interaction that occurs between two objects with the same electrical charge.

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Stage in which a star’s outer layers have started to cool and grow outward?