Answer:
40 (superscript) is the mass number aka atomic mass, and 19 (subscript) is the atomic number aka number of protons and electrons.
Explanation:
Given
The enthalpy of formation of RbF (s) is –557.7kJ/mol
The standard enthalpy of formation of RbF (aq, 1 m) is –583.8 kJ/mol
The enthalpy of solution of RbF = Enthalpy of RbF (aq) - Enthalpy of formation of RbF (s)
= -583.8 - (-557.7) kJ/mol
= -26.1 kJ/mol
The enthalpy is negative which means that the temperature will rise when RbF is dissolved.
1) <span>Check all correct statements concerning pentyne.
a) </span><span>contains 5 carbons
b) </span><span>has a triple bond
c) </span><span>is an alkyne
2) </span><span>Which statement is not true of alkenes?
a) </span><span>They are more stable than alkanes.
3) </span><span>Butene would have 4 carbon atoms and a ______ bond.
a) Double Bond
4) </span><span>Which type of reaction to alkenes generally undergo?
a) Addition Reaction
5) </span><span>If the carbon atom of hydrocarbon is bonded to less than 4 other atoms, the hydrocarbon is considered _______.
a) Unsaturated
6) </span><span>Which of the following apply to unsaturated hydrocarbons? Select all that apply.
a) </span><span>They will react readily with other elements and compounds.
b) </span><span>They have double and triple bonds.
7) </span><span>A straight chain hydrocarbon with the formula C5H10:
a) </span><span>has a double C-C bond
8) </span><span>What is the general formula for alkenes?
a) </span><span>CnH2n
9) </span><span>Choose the statements about benzene that are correct.
a) </span><span>All of the C-C bonds are actually identical.
b) </span>The structure of the molecule is closed like a ring structure.
While a covalent bond is relevant here since it involves sharing electrons between two atoms, I suspect you are talking about electronegativity. Electronegativity is the measure of a particular element's general affinity to attract a negative charge (i.e. electrons) towards its nucleus.