Answer:
Lithium, Li
Explanation:
Metallic elements are elements which form ions by loss of electrons. They are electropositive elements. During the formation of compounds, they easily give up or donate their electrons to other atoms to become positively charged ions. Examples of metals include, sodium, lithium, magnesium, etc
The ionization process of metals is generally shown below:
X ---> X+ + e-
Where X is a metal, and e- rare electrons
Non-metals are elements which form ions by gain of electrons. They are electronegative elements. During the formation of compounds, they accept electrons from electropositive elements to form negatively charged ions or anions. Examples of non-metals include oxygen, chlorine, iodine, etc.
The ionization process of non-metals generally, is shown below:
Y + e- ----> Y-
Semi-metals like silicon, usually form compounds by sharing of electrons with other elements.
Answer:
Methane is lighter than air, having a specific gravity of 0.554. It is only slightly soluble in water. It burns readily in air, forming carbon dioxide and water vapour; the flame is pale, slightly luminous, and very hot. The boiling point of methane is −162 °C (−259.6 °F) and the melting point is −182.5 °C (−296.5 °F).
At the same temperature, steam burns are often more severe that water burns because of water's high HEAT OF VAPORIZATION.
Water possesses high heat of vaporization. The heat of vaporization refers to the amount of heat that is needed to convert a unit mass of water to gas. After getting to the boiling point, a lot of heat is still needed to be absorbed by a boiling water before it can be converted to the gaseous form. Thus, the heat that is inherent in the steam is greater than that which is found in the boiling water, that is why the steam causes more damages.
Answer:
Given:
Mass = 2.56 kg
Volume = 0.820 L
To Find:
Density
Explanation:
Formula:
Substituting value of mass & volume in the formula: