Questions in chemistry

Questions in chemistry

[Terjawab] Calcium oxide (CaO) forms when an atom of calcium loses two electrons, giving it a +2 charge, and an atom of oxygen picks up two electrons, giving it a -2 charge. What is calcium oxide? A. An element B. A covalently bonded compound C. An ionically bonded compound

[Terjawab] What does each of the facts shown above tell you about the element on the periodic table?

[Terjawab] Which type of energy is associated with the random motion of atoms and molecules in a sample of air? 1. chemical energy 2. electrical energy 3. nuclear energy 4. thermal energy

[Terjawab] While your finger is still pushing the coin, there are four forces acting on the coin. What are they?

[Terjawab] A non-metal usually forms 2 covalent bonds in its compounds. How many electrons will it have in its valence shell?

[Terjawab] When you flick a coin so that it slides across a table, it slows down. What is the name of the force that slows it down?

[Terjawab] Polished metals have a metallic luster, which means that they reflect light in a shiny and reflective manner.

[Terjawab] Why does methane have a low boiling point?

[Terjawab] How many valence electrons do rare earth metals have?

[Terjawab] Two forms of solid carbon, diamond and graphite, differ in their physical properties due to differences in their _____.